Abd Hago - Academia.edu (original) (raw)
Papers by Abd Hago
IOP Conference Series: Earth and Environmental Science
The use of natural and artificial cementitious and pozzolanic materials is gaining importance and... more The use of natural and artificial cementitious and pozzolanic materials is gaining importance and become an essential component in today's cement-based materials. Supplementary cementitious materials are recognized to provide an added value to concrete/mortar both for mechanical and durability performances as well as to their sustainability with reduced environmental impacts of the construction industry. Developing locally produced natural pozzolans is vital in the efforts towards enhancing the construction industry's sustainability. Locally extracted raw soil from Nizwa city (NZS) in Oman was ground, calcined, characterized, and used at 10%, 25%, 35%, and 50% as partial replacement of ordinary Portland cement (OPC) in mortar mix. The blend mortar was assessed with regard to compressive strength and durability properties. The obtained results indicate a slight reduction in the flow of the blended mixes. An insignificant effect of the NZS replacement on the hardened mortar...
Materials Today: Proceedings, 2017
Construction projects are now facing several challenges and issues including the sustainability c... more Construction projects are now facing several challenges and issues including the sustainability concept both in terms of design and choice of material. The flooding rainfall of some areas exposed to heavy rain make them very suitable for the development of pervious concrete for pavements applications. Pervious concrete is a special concrete characterized by a high porosity volume and suitable for several flatwork and pavement applications allowing water from rainfall to pass through and hence, reduces the runoff and the requirement for stormwater management systems as well as recharging ground water levels and allowing a natural treatment of polluted water by soil filtration. Additionally, its high porosity contributes to its thermal insulation (non-structural walls) and great acoustical properties (for noise/sound barrier walls). This paper investigates designing a Portland cement pervious concrete (PCPC) that suit many regions of hot climate and using different granular combinations of aggregates in the production of pervious concrete. By successfully designing a pervious concrete with satisfactory mechanical, thermal and hydrological performances, the produced PCPC is a sustainable and even more environmentally friendly for pavement and insulation applications. The results showed a high capacity of drainage with acceptable mechanical properties for the pervious concrete designed with various combinations of natural aggregate.
The Journal of Engineering Research [TJER], 2017
Most historical buildings and structures in Oman were built using unreinforced stone masonry. Suc... more Most historical buildings and structures in Oman were built using unreinforced stone masonry. Such structures are prone to damage from seismic activity as these structures have negligible resistance to tensile stresses. This paper presents an exploration of the physical and chemical properties of local building materials and the results of experiments with a new strengthening technique using textile reinforced mortar. Limestone and Sarooj were the main building materials used historically in these buildings. Sarooj is a local Omani term for artificial pozzolana produced by calcining clays. Two mortar mixes were developed, one as the jointing mortar and the second as the matrix mortar. The second part of the study consisted of the construction of three masonry walls and two columns of 0.35 x 0.25 x 1.2 m (width x depth x height). The three walls were strengthened using externally bonded textiles using three different combinations of mortar and textile. One column specimen was kept ...
The Journal of Engineering Research [TJER], 2015
Residential projects represent the largest section of the construction industry in Oman. It is wi... more Residential projects represent the largest section of the construction industry in Oman. It is widely claimed that designers in Oman tend to unnecessarily overdesign structures, thereby aggravating construction costs. The aim of this research was to investigate the existence and extent of structural overdesign through the investigation of 31 villas which were approved by Muscat Municipality between 2000–2010. The specified villas were structurally redesigned based on the British Code of Practice using the same geometry and material strengths recorded in the drawings. The required reinforcement resulting from the redesign work was compared with the provided reinforcement as per the drawings. The results showed clear cases of extra reinforcement in almost all villas. The difference between required and provided reinforcements in the villas ranged from 2.3– 104.8%, with an average of 48.5% and a standard deviation of 24.0. The required and provided weights of reinforcement per square m...
Sultan Qaboos University Journal for Science [SQUJS], 2003
The aim of this study is to illustrate the problem of fire accidents in the Sultanate of Oman and... more The aim of this study is to illustrate the problem of fire accidents in the Sultanate of Oman and their causes in order to find out how the existing data could be used as a base to improve fire resistance, to detect the weak points (vulnerability to fire) in existing structures, and to minimize fire occurrences in places where it is high. This will also provide useful recommendations with regard to fire safety including causes, people’s awareness and education, etc. Fire data in Oman were collected from two sources: The Directorate General of Civil Defence (Public Relations Department) and Sultan Qaboos University library. The collected data represent the number of fires in Oman during the last decade. It also includes fire distribution by type and averages. The analysis shows that there is a linear increase in the number of fire accidents in the last decade with time. Many factors are included as potential sources, which are explained in the paper, and suggestions are made for ...
The Journal of Engineering Research [TJER], 2007
The effect of curing conditions and silica fume replacement on the compressive strength and the i... more The effect of curing conditions and silica fume replacement on the compressive strength and the initial surface absorption of high performance concrete is reported. The silica fume contents were 5, 10, 15 and 20%, by weight of cement. Four different curing conditions were used: air curing, control curing and two other curing conditions recommended by BS8110 and ACI308-81. The cementitious material (binder) content was constant (400 kg/m3); the water/cement (w/c) ratio was also maintained at a constant value of 0.35; while the water/binder (w/b) ratio ranged from 0.35 to 0.28. The addition of silica fume enhanced the compressive strength significantly up to 30%. The 28-day compressive strength was found to be 69.9 MPa without silica fume and it was determined to be 89.9 MPa with silica fume under the standard curing condition. The 28-day compressive strength results under the control curing condition were found to be higher than the compressive strength for specimens cured under othe...
Sultan Qaboos University Journal for Science [SQUJS], 1998
Qualitative and quantitative analysis of clay minerals are important in the evaluation of the swe... more Qualitative and quantitative analysis of clay minerals are important in the evaluation of the swelling potential of expansive soils A relatively simple method for the quantification of clay minerals of Al-Khod (Northern Oman) using an X-ray diffraction method is described in detail in this paper. The method is based on the additions of known internal standards to the clay sample. The clay investigated in this study contained montmorillonite, palygorskite, illtte and kaolinite. Internal standards of these minerals were mixed with the clay at different proportions and intensities of reflected peak areas were measured. It was found that the peak areas intensities relate linearly with additions of different proportions of standards. From these intensities, the clay minerals present in the clay of Al-khod were estimated.
Sultan Qaboos University Journal for Science [SQUJS], 1999
In the past, sarooj had been used as the basic cementing material with which the A flaj system (t... more In the past, sarooj had been used as the basic cementing material with which the A flaj system (the irrigation system used in Oman) was built. Worldwide, materials like sarooj existed and were known for their good impermeability and long durability. For this reason it was extensively used in hydraulic structures. Even in this century and with the ready availability of Portland cements, special plants were erected to produce materials like sarooj for major dams in the world. In the process of hydration In sarooj-lime mixes or in sarooj-cement mixes free lime is released which causes distress through the expansion of the mortar if allowed to accumulate. If free lime is stabilized within the structure of the mortar. it imparts additional strength and durability to it. The mortar becomes less permeable to water, which increases its resistance to wearhering. The stabilization is possible through the presence of a reactive silica/alumina in the mix so that it reacts with the free lime to ...
The Journal of Engineering Research [TJER], 2008
Sarooj is a local term used for pozzolana. It has been used extensively as a hydraulic binder in ... more Sarooj is a local term used for pozzolana. It has been used extensively as a hydraulic binder in buildings, hydraulic installations, forts and castles, and in the renovation of historical monuments. It is produced by burning specific clay soil that possesses adequate quantities of silica, alumina and iron oxides. In the past, the material was produced using a large amount of energy most of which is wasted by blowing winds. The burning system was usually thermally inefficient, and the output is rarely checked for quality. Test on products produced by using the traditional method may yield poor quality Sarooj due to inadequate burning or over burning or even insufficient grinding in the end. In this research, extensive experimentation has been performed on the method of production of Sarooj to determine the factors influencing Sarooj quality. Based on these factors, a new method of production is proposed. In this method, a fully mobile kiln was designed to produce Sarooj on the site. ...
The Journal of Engineering Research [TJER], 2007
Tests were conducted on five reinforced concrete T-beams subjected to combined load of bending an... more Tests were conducted on five reinforced concrete T-beams subjected to combined load of bending and torsion. Elastic stress field in conjunction with Nielsen's 2D yield criterion for reinforced concrete subjected to in-plane forces were used in the Direct Design Method for the design of reinforcement. The beam dimensions were: flange width = 600mm, flange thickness = 150mm, web width = 200mm, total depth = 600mm and beam length = 5.2m. Required reinforcement calculated using the Direct Design Method was compared with the ACI and BSI codes. It was found that the Direct Design Method requires longitudinal reinforcement similar to the ACI code but less than the BSI code. In the transverse direction, the Direct Design Method requires much less reinforcement than both codes. The main variable studied was the ratio of the maximum twisting moment to the bending moment which was varied between 0.6 and 1.5. Good agreement was found between the design and experimental failure loads. Most o...
International Journal of GEOMATE, 2017
One of the prime aims of the sustainable development strategies in many countries is to provide s... more One of the prime aims of the sustainable development strategies in many countries is to provide safe and secure environment for their inhabitants. This goal can be achieved through the use of environmental friendly building materials, commonly referred to as green building materials and the effective use of waste materials in useful applications such as construction industry. In Oman, saving the environment by finding alternative useful methods for re-using different kind of wastes and seeking ways to reduce the emission of harmful gases, and looking for affordable low-income housing for people are of great concern to the authorities in order to preserve and sustain the environment for the future generations. In order to fulfill such objective, research into the use sustainable materials in the construction industry is encouraged. Therefore, in the same context, this paper discusses the preliminary results from an ongoing research study on the use of produced water from the Petroleum Development Oman (PDO) Nimr and Marmoul oilfields in the development of a new soil-cement block which possesses good strength, good thermal insulation and consume lower quantity of cement than the conventional one. Soil and water samples were brought from Marmoul and Nimr sites. The initial results indicated that both soil and water are suitable for production of compressed blocks with good mechanical properties.
The Journal of Engineering Research [TJER], 2009
Reclaimed Asphalt Pavement (RAP) is the result of removing old asphalt pavement material. RAP con... more Reclaimed Asphalt Pavement (RAP) is the result of removing old asphalt pavement material. RAP consists of high quality well-graded aggregate coated with asphalt cement. The removal of asphalt concrete is done for reconstruction purposes, resurfacing, or to obtain access to buried utilities. The disposal of RAP represents a large loss of valuable source of high quality aggregate. This research investigates the properties of concrete utilizing recycled reclaimed asphalt pavement (RAP). Two control mixes with normal aggregate were designed with water cement ratios of 0.45 and 0.5. The control mixes resulted in compressive strengths of 50 and 33 MPa after 28 days of curing. The coarse fraction of RAP was used to replace the coarse aggregate with 25, 50, 75, and 100% for both mixtures. In addition to the control mix (0%), the mixes containing RAP were evaluated for slump, compressive strength, flexural strength, and modulus of elasticity. Durability was evaluated using surface absorption...
Structural Engineering and Mechanics, 2009
ABSTRACT This paper presents experimental results on the behaviour and ultimate load of fifteen p... more ABSTRACT This paper presents experimental results on the behaviour and ultimate load of fifteen pipes and six roof panels made of ferrocement. Additional results from three roof panels, carried out by others, are also compared with this research results. OPC cement, natural sand and galvanised iron wire mesh were used for the construction of 20 mm thick specimens. The pipe length was 2 m and roof panel length was 2.1 m. The main variables studied were the number of wire mesh layers which were 1, 2, 3, 4 and 6 layers, the inner pipe diameter which were 105, 210 and 315 mm, cross sectional shape of the panel which were channel and box sections and the depth of the edge beam which were 95 mm and 50 mm. All specimens were simply supported and tested for pure bending with test span of 600 mm at mid-span. Tests revealed that increasing the number of wire mesh layers increases the flexural strength and stiffness. Increasing the pipe diameter or depth of edge beam of the panel increases the cracking and ultimate moments. The change in the pipe diameter led to larger effect on ultimate moment than the effect of change in the number of wire mesh layers. The box section showed behaviour and strength similar to that of the channel with same depth and number of wire mesh layers.
Airfield and Highway Pavement, 2006
Petroleum-Contaminated Soil (PCS) results from leaking underground storage tanks, oil spills on c... more Petroleum-Contaminated Soil (PCS) results from leaking underground storage tanks, oil spills on clean soils, or soils surrounding petroleum refineries and crude oil wells. In Oman, Petroleum Development Oman (PDO) generates more than 50,000 tons/year of petroleum-contaminated soil (PCS) and faces a real challenge to safely dispose of these quantities. PDO is currently practicing the bioremediation process with high cost and limited results. This paper presents the results of using PCS as an fine aggregate substitute in Hot Mix Asphalt concrete (HMA) with percentages up to 40 percent by total aggregate weight. Environmental assessment was performed by analyzing the raw contaminated soil for heavy metals, and hydrocarbons. The Marshall mix design method was used to prepare and test the mixes. The results indicated a reduction in optimum asphalt content from 4.1 percent in the control mix to 3.5 percent in the PCS mixes. The increase in PCS content up to 40 percent resulted in a reduction in stability from 24.3 to 4.7 kN and increase in air voids from 3.5 to 9.4 percent. The flow was within the limits of specifications. Leaching of heavy metals using the Toxicity Characteristic Leaching Procedure (TCLP) was also performed on selected mixes. The results indicated concentrations well below the TCLP regulatory limits except for Zn for the 40 percent PCS mixes. The results indicated potential use of up to 15 percernt PCS in surface mixes, while higher percentages (up to 40 percent can however be used for medium or light traffic surface or base course layers.
Environmental & Engineering Geoscience, 2000
Sarooj is an artificial pozzolan produced by burning special types of clays. It has been used ext... more Sarooj is an artificial pozzolan produced by burning special types of clays. It has been used extensively in Oman as a cementing material in concrete masonry construction, particularly in hydraulic structures, buildings and military installations. Sarooj is cementitious when mixed with lime and water. It is a cheap cementitious material for use in construction and restoration of historical buildings. An experimental research program was developed to determine the optimum volume proportions that can be used in concrete and mortar mixtures. Twenty five sarooj-lime mixes having different proportions of sarooj, lime, sand and water were tested. In addition, tow groups of mixes (sarooj, lime, sand, water) batched by weight and by volume, with each group contained three mixes of the same proportions, were tested to study the effect of the fineness of sarooj on the strength characteristics of the sarooj-lime mix. It was found that grinding sarooj to pass the 300 mu m sieve produced the hig...
Management of Environmental Quality: An International Journal, 2005
... Hossam F. Hassan, Department of Civil and Architectural Engineering, Sultan Qaboos University... more ... Hossam F. Hassan, Department of Civil and Architectural Engineering, Sultan Qaboos University, Muscat, Sultanate of Oman. ... Al-Sanad, HA, Eid, WK, Ismael, NF (1995), "Geotechnical properties of oil contaminated Kuwaiti sand", Journal of Geotechnical Engineering, ASCE, Vol. ...
Journal of Materials in Civil Engineering, 2009
This paper presents the results of an investigation to study the possibility of developing concre... more This paper presents the results of an investigation to study the possibility of developing concrete blocks using waste materials. The blocks were produced from three waste materials: vermiculite and polystyrene beads, which were used as lightweight aggregates with different proportions in the mix, and cement kiln dust (CKD), which was used as a partial replacement for cement. The strength of the three types of blocks and the strength of masonry columns constructed from the blocks were compared with another two types of ...
Geotechnical and Geological Engineering, 2001
Two methods for the quantification of clay minerals using X-ray diffraction techniques: the Const... more Two methods for the quantification of clay minerals using X-ray diffraction techniques: the Constant Mineral Standards Method and the Constant Clay Method were applied to soil samples from Al-Khod (Northern Oman). The first method was based on the addition of different concentrations of clay to constant mineral standards while the latter was based on the additions of known internal standards
Construction and Building Materials, 2007
This paper presents the results of a study on the potential use of petroleum-contaminated soil (P... more This paper presents the results of a study on the potential use of petroleum-contaminated soil (PCS) in the manufacturing of concrete blocks. PCS was obtained from Fahud asset area in northern Oman, where contaminated soils are typically transported for treatment. Hollow blocks of size 400×200×200mm, widely used in Oman, were manufactured with a mix proportion of 1:2:4:0.8 for cement, coarse
IOP Conference Series: Earth and Environmental Science
The use of natural and artificial cementitious and pozzolanic materials is gaining importance and... more The use of natural and artificial cementitious and pozzolanic materials is gaining importance and become an essential component in today's cement-based materials. Supplementary cementitious materials are recognized to provide an added value to concrete/mortar both for mechanical and durability performances as well as to their sustainability with reduced environmental impacts of the construction industry. Developing locally produced natural pozzolans is vital in the efforts towards enhancing the construction industry's sustainability. Locally extracted raw soil from Nizwa city (NZS) in Oman was ground, calcined, characterized, and used at 10%, 25%, 35%, and 50% as partial replacement of ordinary Portland cement (OPC) in mortar mix. The blend mortar was assessed with regard to compressive strength and durability properties. The obtained results indicate a slight reduction in the flow of the blended mixes. An insignificant effect of the NZS replacement on the hardened mortar...
Materials Today: Proceedings, 2017
Construction projects are now facing several challenges and issues including the sustainability c... more Construction projects are now facing several challenges and issues including the sustainability concept both in terms of design and choice of material. The flooding rainfall of some areas exposed to heavy rain make them very suitable for the development of pervious concrete for pavements applications. Pervious concrete is a special concrete characterized by a high porosity volume and suitable for several flatwork and pavement applications allowing water from rainfall to pass through and hence, reduces the runoff and the requirement for stormwater management systems as well as recharging ground water levels and allowing a natural treatment of polluted water by soil filtration. Additionally, its high porosity contributes to its thermal insulation (non-structural walls) and great acoustical properties (for noise/sound barrier walls). This paper investigates designing a Portland cement pervious concrete (PCPC) that suit many regions of hot climate and using different granular combinations of aggregates in the production of pervious concrete. By successfully designing a pervious concrete with satisfactory mechanical, thermal and hydrological performances, the produced PCPC is a sustainable and even more environmentally friendly for pavement and insulation applications. The results showed a high capacity of drainage with acceptable mechanical properties for the pervious concrete designed with various combinations of natural aggregate.
The Journal of Engineering Research [TJER], 2017
Most historical buildings and structures in Oman were built using unreinforced stone masonry. Suc... more Most historical buildings and structures in Oman were built using unreinforced stone masonry. Such structures are prone to damage from seismic activity as these structures have negligible resistance to tensile stresses. This paper presents an exploration of the physical and chemical properties of local building materials and the results of experiments with a new strengthening technique using textile reinforced mortar. Limestone and Sarooj were the main building materials used historically in these buildings. Sarooj is a local Omani term for artificial pozzolana produced by calcining clays. Two mortar mixes were developed, one as the jointing mortar and the second as the matrix mortar. The second part of the study consisted of the construction of three masonry walls and two columns of 0.35 x 0.25 x 1.2 m (width x depth x height). The three walls were strengthened using externally bonded textiles using three different combinations of mortar and textile. One column specimen was kept ...
The Journal of Engineering Research [TJER], 2015
Residential projects represent the largest section of the construction industry in Oman. It is wi... more Residential projects represent the largest section of the construction industry in Oman. It is widely claimed that designers in Oman tend to unnecessarily overdesign structures, thereby aggravating construction costs. The aim of this research was to investigate the existence and extent of structural overdesign through the investigation of 31 villas which were approved by Muscat Municipality between 2000–2010. The specified villas were structurally redesigned based on the British Code of Practice using the same geometry and material strengths recorded in the drawings. The required reinforcement resulting from the redesign work was compared with the provided reinforcement as per the drawings. The results showed clear cases of extra reinforcement in almost all villas. The difference between required and provided reinforcements in the villas ranged from 2.3– 104.8%, with an average of 48.5% and a standard deviation of 24.0. The required and provided weights of reinforcement per square m...
Sultan Qaboos University Journal for Science [SQUJS], 2003
The aim of this study is to illustrate the problem of fire accidents in the Sultanate of Oman and... more The aim of this study is to illustrate the problem of fire accidents in the Sultanate of Oman and their causes in order to find out how the existing data could be used as a base to improve fire resistance, to detect the weak points (vulnerability to fire) in existing structures, and to minimize fire occurrences in places where it is high. This will also provide useful recommendations with regard to fire safety including causes, people’s awareness and education, etc. Fire data in Oman were collected from two sources: The Directorate General of Civil Defence (Public Relations Department) and Sultan Qaboos University library. The collected data represent the number of fires in Oman during the last decade. It also includes fire distribution by type and averages. The analysis shows that there is a linear increase in the number of fire accidents in the last decade with time. Many factors are included as potential sources, which are explained in the paper, and suggestions are made for ...
The Journal of Engineering Research [TJER], 2007
The effect of curing conditions and silica fume replacement on the compressive strength and the i... more The effect of curing conditions and silica fume replacement on the compressive strength and the initial surface absorption of high performance concrete is reported. The silica fume contents were 5, 10, 15 and 20%, by weight of cement. Four different curing conditions were used: air curing, control curing and two other curing conditions recommended by BS8110 and ACI308-81. The cementitious material (binder) content was constant (400 kg/m3); the water/cement (w/c) ratio was also maintained at a constant value of 0.35; while the water/binder (w/b) ratio ranged from 0.35 to 0.28. The addition of silica fume enhanced the compressive strength significantly up to 30%. The 28-day compressive strength was found to be 69.9 MPa without silica fume and it was determined to be 89.9 MPa with silica fume under the standard curing condition. The 28-day compressive strength results under the control curing condition were found to be higher than the compressive strength for specimens cured under othe...
Sultan Qaboos University Journal for Science [SQUJS], 1998
Qualitative and quantitative analysis of clay minerals are important in the evaluation of the swe... more Qualitative and quantitative analysis of clay minerals are important in the evaluation of the swelling potential of expansive soils A relatively simple method for the quantification of clay minerals of Al-Khod (Northern Oman) using an X-ray diffraction method is described in detail in this paper. The method is based on the additions of known internal standards to the clay sample. The clay investigated in this study contained montmorillonite, palygorskite, illtte and kaolinite. Internal standards of these minerals were mixed with the clay at different proportions and intensities of reflected peak areas were measured. It was found that the peak areas intensities relate linearly with additions of different proportions of standards. From these intensities, the clay minerals present in the clay of Al-khod were estimated.
Sultan Qaboos University Journal for Science [SQUJS], 1999
In the past, sarooj had been used as the basic cementing material with which the A flaj system (t... more In the past, sarooj had been used as the basic cementing material with which the A flaj system (the irrigation system used in Oman) was built. Worldwide, materials like sarooj existed and were known for their good impermeability and long durability. For this reason it was extensively used in hydraulic structures. Even in this century and with the ready availability of Portland cements, special plants were erected to produce materials like sarooj for major dams in the world. In the process of hydration In sarooj-lime mixes or in sarooj-cement mixes free lime is released which causes distress through the expansion of the mortar if allowed to accumulate. If free lime is stabilized within the structure of the mortar. it imparts additional strength and durability to it. The mortar becomes less permeable to water, which increases its resistance to wearhering. The stabilization is possible through the presence of a reactive silica/alumina in the mix so that it reacts with the free lime to ...
The Journal of Engineering Research [TJER], 2008
Sarooj is a local term used for pozzolana. It has been used extensively as a hydraulic binder in ... more Sarooj is a local term used for pozzolana. It has been used extensively as a hydraulic binder in buildings, hydraulic installations, forts and castles, and in the renovation of historical monuments. It is produced by burning specific clay soil that possesses adequate quantities of silica, alumina and iron oxides. In the past, the material was produced using a large amount of energy most of which is wasted by blowing winds. The burning system was usually thermally inefficient, and the output is rarely checked for quality. Test on products produced by using the traditional method may yield poor quality Sarooj due to inadequate burning or over burning or even insufficient grinding in the end. In this research, extensive experimentation has been performed on the method of production of Sarooj to determine the factors influencing Sarooj quality. Based on these factors, a new method of production is proposed. In this method, a fully mobile kiln was designed to produce Sarooj on the site. ...
The Journal of Engineering Research [TJER], 2007
Tests were conducted on five reinforced concrete T-beams subjected to combined load of bending an... more Tests were conducted on five reinforced concrete T-beams subjected to combined load of bending and torsion. Elastic stress field in conjunction with Nielsen's 2D yield criterion for reinforced concrete subjected to in-plane forces were used in the Direct Design Method for the design of reinforcement. The beam dimensions were: flange width = 600mm, flange thickness = 150mm, web width = 200mm, total depth = 600mm and beam length = 5.2m. Required reinforcement calculated using the Direct Design Method was compared with the ACI and BSI codes. It was found that the Direct Design Method requires longitudinal reinforcement similar to the ACI code but less than the BSI code. In the transverse direction, the Direct Design Method requires much less reinforcement than both codes. The main variable studied was the ratio of the maximum twisting moment to the bending moment which was varied between 0.6 and 1.5. Good agreement was found between the design and experimental failure loads. Most o...
International Journal of GEOMATE, 2017
One of the prime aims of the sustainable development strategies in many countries is to provide s... more One of the prime aims of the sustainable development strategies in many countries is to provide safe and secure environment for their inhabitants. This goal can be achieved through the use of environmental friendly building materials, commonly referred to as green building materials and the effective use of waste materials in useful applications such as construction industry. In Oman, saving the environment by finding alternative useful methods for re-using different kind of wastes and seeking ways to reduce the emission of harmful gases, and looking for affordable low-income housing for people are of great concern to the authorities in order to preserve and sustain the environment for the future generations. In order to fulfill such objective, research into the use sustainable materials in the construction industry is encouraged. Therefore, in the same context, this paper discusses the preliminary results from an ongoing research study on the use of produced water from the Petroleum Development Oman (PDO) Nimr and Marmoul oilfields in the development of a new soil-cement block which possesses good strength, good thermal insulation and consume lower quantity of cement than the conventional one. Soil and water samples were brought from Marmoul and Nimr sites. The initial results indicated that both soil and water are suitable for production of compressed blocks with good mechanical properties.
The Journal of Engineering Research [TJER], 2009
Reclaimed Asphalt Pavement (RAP) is the result of removing old asphalt pavement material. RAP con... more Reclaimed Asphalt Pavement (RAP) is the result of removing old asphalt pavement material. RAP consists of high quality well-graded aggregate coated with asphalt cement. The removal of asphalt concrete is done for reconstruction purposes, resurfacing, or to obtain access to buried utilities. The disposal of RAP represents a large loss of valuable source of high quality aggregate. This research investigates the properties of concrete utilizing recycled reclaimed asphalt pavement (RAP). Two control mixes with normal aggregate were designed with water cement ratios of 0.45 and 0.5. The control mixes resulted in compressive strengths of 50 and 33 MPa after 28 days of curing. The coarse fraction of RAP was used to replace the coarse aggregate with 25, 50, 75, and 100% for both mixtures. In addition to the control mix (0%), the mixes containing RAP were evaluated for slump, compressive strength, flexural strength, and modulus of elasticity. Durability was evaluated using surface absorption...
Structural Engineering and Mechanics, 2009
ABSTRACT This paper presents experimental results on the behaviour and ultimate load of fifteen p... more ABSTRACT This paper presents experimental results on the behaviour and ultimate load of fifteen pipes and six roof panels made of ferrocement. Additional results from three roof panels, carried out by others, are also compared with this research results. OPC cement, natural sand and galvanised iron wire mesh were used for the construction of 20 mm thick specimens. The pipe length was 2 m and roof panel length was 2.1 m. The main variables studied were the number of wire mesh layers which were 1, 2, 3, 4 and 6 layers, the inner pipe diameter which were 105, 210 and 315 mm, cross sectional shape of the panel which were channel and box sections and the depth of the edge beam which were 95 mm and 50 mm. All specimens were simply supported and tested for pure bending with test span of 600 mm at mid-span. Tests revealed that increasing the number of wire mesh layers increases the flexural strength and stiffness. Increasing the pipe diameter or depth of edge beam of the panel increases the cracking and ultimate moments. The change in the pipe diameter led to larger effect on ultimate moment than the effect of change in the number of wire mesh layers. The box section showed behaviour and strength similar to that of the channel with same depth and number of wire mesh layers.
Airfield and Highway Pavement, 2006
Petroleum-Contaminated Soil (PCS) results from leaking underground storage tanks, oil spills on c... more Petroleum-Contaminated Soil (PCS) results from leaking underground storage tanks, oil spills on clean soils, or soils surrounding petroleum refineries and crude oil wells. In Oman, Petroleum Development Oman (PDO) generates more than 50,000 tons/year of petroleum-contaminated soil (PCS) and faces a real challenge to safely dispose of these quantities. PDO is currently practicing the bioremediation process with high cost and limited results. This paper presents the results of using PCS as an fine aggregate substitute in Hot Mix Asphalt concrete (HMA) with percentages up to 40 percent by total aggregate weight. Environmental assessment was performed by analyzing the raw contaminated soil for heavy metals, and hydrocarbons. The Marshall mix design method was used to prepare and test the mixes. The results indicated a reduction in optimum asphalt content from 4.1 percent in the control mix to 3.5 percent in the PCS mixes. The increase in PCS content up to 40 percent resulted in a reduction in stability from 24.3 to 4.7 kN and increase in air voids from 3.5 to 9.4 percent. The flow was within the limits of specifications. Leaching of heavy metals using the Toxicity Characteristic Leaching Procedure (TCLP) was also performed on selected mixes. The results indicated concentrations well below the TCLP regulatory limits except for Zn for the 40 percent PCS mixes. The results indicated potential use of up to 15 percernt PCS in surface mixes, while higher percentages (up to 40 percent can however be used for medium or light traffic surface or base course layers.
Environmental & Engineering Geoscience, 2000
Sarooj is an artificial pozzolan produced by burning special types of clays. It has been used ext... more Sarooj is an artificial pozzolan produced by burning special types of clays. It has been used extensively in Oman as a cementing material in concrete masonry construction, particularly in hydraulic structures, buildings and military installations. Sarooj is cementitious when mixed with lime and water. It is a cheap cementitious material for use in construction and restoration of historical buildings. An experimental research program was developed to determine the optimum volume proportions that can be used in concrete and mortar mixtures. Twenty five sarooj-lime mixes having different proportions of sarooj, lime, sand and water were tested. In addition, tow groups of mixes (sarooj, lime, sand, water) batched by weight and by volume, with each group contained three mixes of the same proportions, were tested to study the effect of the fineness of sarooj on the strength characteristics of the sarooj-lime mix. It was found that grinding sarooj to pass the 300 mu m sieve produced the hig...
Management of Environmental Quality: An International Journal, 2005
... Hossam F. Hassan, Department of Civil and Architectural Engineering, Sultan Qaboos University... more ... Hossam F. Hassan, Department of Civil and Architectural Engineering, Sultan Qaboos University, Muscat, Sultanate of Oman. ... Al-Sanad, HA, Eid, WK, Ismael, NF (1995), "Geotechnical properties of oil contaminated Kuwaiti sand", Journal of Geotechnical Engineering, ASCE, Vol. ...
Journal of Materials in Civil Engineering, 2009
This paper presents the results of an investigation to study the possibility of developing concre... more This paper presents the results of an investigation to study the possibility of developing concrete blocks using waste materials. The blocks were produced from three waste materials: vermiculite and polystyrene beads, which were used as lightweight aggregates with different proportions in the mix, and cement kiln dust (CKD), which was used as a partial replacement for cement. The strength of the three types of blocks and the strength of masonry columns constructed from the blocks were compared with another two types of ...
Geotechnical and Geological Engineering, 2001
Two methods for the quantification of clay minerals using X-ray diffraction techniques: the Const... more Two methods for the quantification of clay minerals using X-ray diffraction techniques: the Constant Mineral Standards Method and the Constant Clay Method were applied to soil samples from Al-Khod (Northern Oman). The first method was based on the addition of different concentrations of clay to constant mineral standards while the latter was based on the additions of known internal standards
Construction and Building Materials, 2007
This paper presents the results of a study on the potential use of petroleum-contaminated soil (P... more This paper presents the results of a study on the potential use of petroleum-contaminated soil (PCS) in the manufacturing of concrete blocks. PCS was obtained from Fahud asset area in northern Oman, where contaminated soils are typically transported for treatment. Hollow blocks of size 400×200×200mm, widely used in Oman, were manufactured with a mix proportion of 1:2:4:0.8 for cement, coarse