Layth Alasadi | University of Kufa - Iraq (original) (raw)
Papers by Layth Alasadi
Pollack Periodica
In this article, polymer-modified concrete was studied to present the effect of using additives o... more In this article, polymer-modified concrete was studied to present the effect of using additives on its mechanical properties. This will be achieved by employing a high-performance super plasticizing admixture that significantly enhances polymer-modified concrete mechanical capabilities. The study indicates that the polymer styrene-butadiene rubber (used increases concrete mechanical properties by 10% by weight. When the dosage exceeds 10% by weight of cement, the compressive, tensile, and flexural strengths of polymer-modified concrete are diminished. With the addition of a superplasticizer with a ratio of 1.2%, regular polymer-modified concrete compressive strength has increased from 34.3 to 42.9 MPa for a 10% polymer/cement ratio. Additionally, this superplasticizer enhanced the Material's flexural and tensile strength.
Scientific Review Engineering and Environmental Studies (SREES)
Spur-dikes are efficient hydraulic structures that are made for numerous purposes. They have one ... more Spur-dikes are efficient hydraulic structures that are made for numerous purposes. They have one end on the stream bank and another extending into the current. As a result of the existing spur-dikes in the stream course, the local scour phenomena usually occur around them, leading to several predicaments which have been of great concern to the hydraulic engineers. For the present work, laboratory experiments were carried out to measure the scour depths around several spur-dikes located at different distances for the V-shaped one. The experiments were conducted using physical models installed in a non-curved flume with a bed with uniform cohesion-less sediment of a medium particle size (d50 = 0.7 mm). All the models were operated under the subcritical flow of clear-water conditions. The investigations include three spur-dikes (1, 2 and 3) and three distances between them (1, 1.5 and 2 of spur-dike length) as two countermeasures to minimize the local scour depths. The results showed t...
Composites Science and Technology, 2007
Carbon-nanotubes (CNTs) have been used with polymers from the date of their inception to make com... more Carbon-nanotubes (CNTs) have been used with polymers from the date of their inception to make composites having remarkable properties. An attempt has been made in this direction, in order to enhance mechanical and tribological properties of the composite materials. The latter, were achieved through the injection molding of high density polyethylene (HDPE) reinforced with specific volume fraction of CNTs. A
Lean concrete mixes is a concrete mix with low cement content and high percentages of aggregates,... more Lean concrete mixes is a concrete mix with low cement content and high percentages of aggregates, it used in several works such as the blinding concrete under foundations and as leveling course below footings or in mass concrete such as dams. The need to make this layer of concrete in more strength and more durable is important, using polymers such as styrene butadiene rubber (SBR) in concrete improve the mechanical strength of concrete and durability and make concrete permeability very low, and also using silica-fume powder leads also to improve the strength of concrete. This investigation studies the effect of using styrene butadiene rubber polymer in different percentages and also silica fume to lean mixes to improve the mechanical properties. Mixes with 10% polymers gives the highest values of mechanical properties with 10 % silica fume , it gives average compressive strength of 24.3 MPa while in reference mix give 13.2 MPa , the flexural strength also increased from 1.24 MPa for lean mixes to 4.8 MPa to silica-polymer mixes .the main reason for using polymers and silica fume is because of these two materials reduce the heat of hydration during mixing and casting concrete, so that is very important in mass concrete.
International Journal of Technology and Engineering Studies, 2018
This research aims to study silica fume and liquid polymers (Styrene Butadiene Rubber (SBR)) on a... more This research aims to study silica fume and liquid polymers (Styrene Butadiene Rubber (SBR)) on absorption and some mechanical properties of concrete like compressive strength, tensile strength, and flexural strength of concrete containing waste aggregates. The aim for using silica fume powder is to increase the strength of concrete by reaction of this material with silicates hydroxide that liberates from the hydration of cement. This reaction gives additional cement gel that fills the pores inside cement paste and gives higher strength, less absorption concrete, and more durable concrete. Using the waste aggregates in this study has two benefits: the decrease in concrete cost. Secondly, it is higher mechanical properties by using glass aggregates because of its properties that have zero absorption compared with normal aggregates and higher strength of glass that give concrete additional strength and durability. The effect of silica fume only on concrete was given a 61% increment in compressive strength. However, with polymers together give about 72% increment, flexural strength increased from 3.8 MPa for reference mixes to 10.5 MPa for silica fume mixes and 12.3 MPa for polymer-silica mixes. The absorption decreases from 6.01% to 2.85% for silica mixes and to 1.5% for polymer-silica mixes. SBR can give additional bonds between cement particles or gel with external silica of aggregates and decrease voids inside concrete. So, the use of both silica fume and polymers can give extra bond and strength and fewer voids concrete, and these are the main aims of using both materials in this study. Hence, these findings could be beneficial for manufacturers and builders.
International Conference on Cross Culture Studies in Social Sciences, Management & Humanities (CSMH-SEP-2018), Sep 25, 2018
This research aims to study the effect of silica fume and liquid polymers (Styrene Butadiene Rubb... more This research aims to study the effect of silica fume and liquid polymers (Styrene Butadiene Rubber (SBR)) on absorption and some mechanical properties of concrete like compressive strength, tensile strength and flexural strength of concrete containing waste aggregates. The reference mixes having waste aggregates (crushed glass) as coarse aggregates to decrease the cost of concrete and also increase strength. The aim for using silica fume powder is to increase strength of concrete by reaction of this material with silicates hydroxide that liberate from hydration of cement and this reaction give additional cement gel that fill the pores inside cement paste and that give higher strength and less absorption concrete, and that also give more durable concrete. The using of liquid polymer (SBR) can give additional bond between cement particles or gel with external silica of aggregates and also decreasing voids inside concrete. So, the using of both silica fume and polymers can give extra bond and strength and less voids concrete and these are the main aims of using both materials in this study. Using the waste aggregates in this study have two benefits firstly is the decrease for cost of concrete and secondly is higher mechanical properties by using glass aggregates because of its properties that have zero absorption compared with normal aggregates and also higher strength of glass, that give concrete additional strength and durability. The effect of silica fume only on concrete was given 61% increment in compressive strength, but with polymers together give about 72% increment, flexural strength increased from 3.8 MPa for reference mixes to 10.5 MPa for silica fume mixes and 12.3 MPa for polymer-silica mixes. The absorption decreases from 6.01% to 2.85% for silica mixes and to 1.5% for polymer-silica mixes.
MECHANICAL PROPERTIES OF WASTE AGGREGATE-STEEL FIBER REINFORCED CONCRETE MODIFIED WITH WATERPROOF ADMIXTURE, Nov 21, 2018
This study aims to improve the mechanical properties of waste aggregate concrete by using steel f... more This study aims to improve the mechanical properties of waste aggregate concrete by using steel fibers and waterproof liquid admixture. The study shows that using waste rocks and glass aggregate improves mechanical properties comparing with reference mix, using steel fibers increase compressive strength, tensile strength and much higher values in the flexural strength. Using waterproof admixture enhance mechanical properties of steel fiber concrete and give higher strength concrete, compressive strength increased from 43.33 MPa for steel fiber concrete (with waste aggregates) to 57.82 MPa, tensile strength increased from 4.64 MPa to 5.83 MPa , flexural strength increased from 8.95 to 12.73 MPa and also the modulus of elasticity increased from 29801 MPa for steel fiber-waste aggregate concrete to 33879 MPa for waste aggregate-steel fiber concrete improved with waterproof admixture.
International Journal of Civil Engineering and Technology, Jul 2018
The current study offers the finite element application on a rigid apron pavement to get develope... more The current study offers the finite element application on a rigid apron pavement to get developed tensile stresses and strains due to huge aircraft gross weight. FAAFIELD software was utilized to design the apron layers for International Al-Najaf airport. The ANSYS 14 finite element software program is applied in testing of the design parameters of rigid pavement airport structures. Two 3D-FEM are utilized to model plain and reinforced concrete slab supported by several elastic springs which rigidity is presented by the modulus of subgrade reaction denoted by (k). The extreme tensile stress has been gotten at the beneath of concrete panel slab under various cases of material properties and heavy aircraft landing gear loading. Furthermore, statistics model related maximum tensile stress as dependent variable with elastic modulus and thickness of concrete panel, and modulus of subgrade reaction has been developed by using SPSS version 23.
International Journal of Civil Engineering and Technology, Oct 21, 2018
Fiber reinforced concrete is widely used in concrete structures, it has several benefits like inc... more Fiber reinforced concrete is widely used in concrete structures, it has several benefits like increasing tensile, compressive, flexural strength and modulus of elasticity and also increases ductility and toughness of concrete. This research aims to improve the mechanical properties of concrete by using polyethylene fibers obtained from plastic cans, higher tensile and flexural strength obtained by using this type of fiber. This Polyethylene fiber is more durable than other types of fibers since it does not rust with time like steel fibers types. Compressive strength in this research increased from 37.4 MPa to 49.3 MPa, flexural strength increased from 3.5 MPa to 9.89 MPa, and tensile strength increased from 2.9 MPa to 5.1 MPa.
International Journal of Civil Engineering and Technology, Sep 2018
Lean concrete mixes is a concrete mix with low cement content and high percentages of aggregates,... more Lean concrete mixes is a concrete mix with low cement content and high percentages of aggregates, it used in several works such as the blinding concrete under foundations and as leveling course below footings or in mass concrete such as dams. The need to make this layer of concrete in more strength and more durable is important, using polymers such as styrene butadiene rubber (SBR) in concrete improve the mechanical strength of concrete and durability and make concrete permeability very low, and also using silica-fume powder leads also to improve the strength of concrete. This investigation studies the effect of using styrene butadiene rubber polymer in different percentages and also silica fume to lean mixes to improve the mechanical properties. Mixes with 10% polymers gives the highest values of mechanical properties with 10 % silica fume , it gives average compressive strength of 24.3 MPa while in reference mix give 13.2 MPa , the flexural strength also increased from 1.24 MPa for lean mixes to 4.8 MPa to silica-polymer mixes .the main reason for using polymers and silica fume is because of these two materials reduce the heat of hydration during mixing and casting concrete, so that is very important in mass concrete.
Journal of University of Babylon for Engineering Sciences, 2018
Permeable paving has been vastly utilized as an alternate to traditional impervious hard surfaces... more Permeable paving has been vastly utilized as an alternate to traditional impervious hard surfaces, such as street, parking lots, sidewalk and pedestrian areas. This leads to several rain water management and environmental advantage. Therefore, this study has focused on brief the wide-range of permeable pavement systems. These types of permeable pavements have been reviewed in addition to the usefulness of each kind. The results indicated the potential of using such kind in different locations in Iraq is more likely such as Al-Najaf city. Several points of soil investigations have been conducted by previous studies within Al-Najaf city (boundary of Al-Najaf Municipal) prove that Al-Najfa soil is sandy soil. These tested points also demonstrate that the soil characteristics of the city are so suitable for such type of pavement.
Pollack Periodica
In this article, polymer-modified concrete was studied to present the effect of using additives o... more In this article, polymer-modified concrete was studied to present the effect of using additives on its mechanical properties. This will be achieved by employing a high-performance super plasticizing admixture that significantly enhances polymer-modified concrete mechanical capabilities. The study indicates that the polymer styrene-butadiene rubber (used increases concrete mechanical properties by 10% by weight. When the dosage exceeds 10% by weight of cement, the compressive, tensile, and flexural strengths of polymer-modified concrete are diminished. With the addition of a superplasticizer with a ratio of 1.2%, regular polymer-modified concrete compressive strength has increased from 34.3 to 42.9 MPa for a 10% polymer/cement ratio. Additionally, this superplasticizer enhanced the Material's flexural and tensile strength.
Scientific Review Engineering and Environmental Studies (SREES)
Spur-dikes are efficient hydraulic structures that are made for numerous purposes. They have one ... more Spur-dikes are efficient hydraulic structures that are made for numerous purposes. They have one end on the stream bank and another extending into the current. As a result of the existing spur-dikes in the stream course, the local scour phenomena usually occur around them, leading to several predicaments which have been of great concern to the hydraulic engineers. For the present work, laboratory experiments were carried out to measure the scour depths around several spur-dikes located at different distances for the V-shaped one. The experiments were conducted using physical models installed in a non-curved flume with a bed with uniform cohesion-less sediment of a medium particle size (d50 = 0.7 mm). All the models were operated under the subcritical flow of clear-water conditions. The investigations include three spur-dikes (1, 2 and 3) and three distances between them (1, 1.5 and 2 of spur-dike length) as two countermeasures to minimize the local scour depths. The results showed t...
Composites Science and Technology, 2007
Carbon-nanotubes (CNTs) have been used with polymers from the date of their inception to make com... more Carbon-nanotubes (CNTs) have been used with polymers from the date of their inception to make composites having remarkable properties. An attempt has been made in this direction, in order to enhance mechanical and tribological properties of the composite materials. The latter, were achieved through the injection molding of high density polyethylene (HDPE) reinforced with specific volume fraction of CNTs. A
Lean concrete mixes is a concrete mix with low cement content and high percentages of aggregates,... more Lean concrete mixes is a concrete mix with low cement content and high percentages of aggregates, it used in several works such as the blinding concrete under foundations and as leveling course below footings or in mass concrete such as dams. The need to make this layer of concrete in more strength and more durable is important, using polymers such as styrene butadiene rubber (SBR) in concrete improve the mechanical strength of concrete and durability and make concrete permeability very low, and also using silica-fume powder leads also to improve the strength of concrete. This investigation studies the effect of using styrene butadiene rubber polymer in different percentages and also silica fume to lean mixes to improve the mechanical properties. Mixes with 10% polymers gives the highest values of mechanical properties with 10 % silica fume , it gives average compressive strength of 24.3 MPa while in reference mix give 13.2 MPa , the flexural strength also increased from 1.24 MPa for lean mixes to 4.8 MPa to silica-polymer mixes .the main reason for using polymers and silica fume is because of these two materials reduce the heat of hydration during mixing and casting concrete, so that is very important in mass concrete.
International Journal of Technology and Engineering Studies, 2018
This research aims to study silica fume and liquid polymers (Styrene Butadiene Rubber (SBR)) on a... more This research aims to study silica fume and liquid polymers (Styrene Butadiene Rubber (SBR)) on absorption and some mechanical properties of concrete like compressive strength, tensile strength, and flexural strength of concrete containing waste aggregates. The aim for using silica fume powder is to increase the strength of concrete by reaction of this material with silicates hydroxide that liberates from the hydration of cement. This reaction gives additional cement gel that fills the pores inside cement paste and gives higher strength, less absorption concrete, and more durable concrete. Using the waste aggregates in this study has two benefits: the decrease in concrete cost. Secondly, it is higher mechanical properties by using glass aggregates because of its properties that have zero absorption compared with normal aggregates and higher strength of glass that give concrete additional strength and durability. The effect of silica fume only on concrete was given a 61% increment in compressive strength. However, with polymers together give about 72% increment, flexural strength increased from 3.8 MPa for reference mixes to 10.5 MPa for silica fume mixes and 12.3 MPa for polymer-silica mixes. The absorption decreases from 6.01% to 2.85% for silica mixes and to 1.5% for polymer-silica mixes. SBR can give additional bonds between cement particles or gel with external silica of aggregates and decrease voids inside concrete. So, the use of both silica fume and polymers can give extra bond and strength and fewer voids concrete, and these are the main aims of using both materials in this study. Hence, these findings could be beneficial for manufacturers and builders.
International Conference on Cross Culture Studies in Social Sciences, Management & Humanities (CSMH-SEP-2018), Sep 25, 2018
This research aims to study the effect of silica fume and liquid polymers (Styrene Butadiene Rubb... more This research aims to study the effect of silica fume and liquid polymers (Styrene Butadiene Rubber (SBR)) on absorption and some mechanical properties of concrete like compressive strength, tensile strength and flexural strength of concrete containing waste aggregates. The reference mixes having waste aggregates (crushed glass) as coarse aggregates to decrease the cost of concrete and also increase strength. The aim for using silica fume powder is to increase strength of concrete by reaction of this material with silicates hydroxide that liberate from hydration of cement and this reaction give additional cement gel that fill the pores inside cement paste and that give higher strength and less absorption concrete, and that also give more durable concrete. The using of liquid polymer (SBR) can give additional bond between cement particles or gel with external silica of aggregates and also decreasing voids inside concrete. So, the using of both silica fume and polymers can give extra bond and strength and less voids concrete and these are the main aims of using both materials in this study. Using the waste aggregates in this study have two benefits firstly is the decrease for cost of concrete and secondly is higher mechanical properties by using glass aggregates because of its properties that have zero absorption compared with normal aggregates and also higher strength of glass, that give concrete additional strength and durability. The effect of silica fume only on concrete was given 61% increment in compressive strength, but with polymers together give about 72% increment, flexural strength increased from 3.8 MPa for reference mixes to 10.5 MPa for silica fume mixes and 12.3 MPa for polymer-silica mixes. The absorption decreases from 6.01% to 2.85% for silica mixes and to 1.5% for polymer-silica mixes.
MECHANICAL PROPERTIES OF WASTE AGGREGATE-STEEL FIBER REINFORCED CONCRETE MODIFIED WITH WATERPROOF ADMIXTURE, Nov 21, 2018
This study aims to improve the mechanical properties of waste aggregate concrete by using steel f... more This study aims to improve the mechanical properties of waste aggregate concrete by using steel fibers and waterproof liquid admixture. The study shows that using waste rocks and glass aggregate improves mechanical properties comparing with reference mix, using steel fibers increase compressive strength, tensile strength and much higher values in the flexural strength. Using waterproof admixture enhance mechanical properties of steel fiber concrete and give higher strength concrete, compressive strength increased from 43.33 MPa for steel fiber concrete (with waste aggregates) to 57.82 MPa, tensile strength increased from 4.64 MPa to 5.83 MPa , flexural strength increased from 8.95 to 12.73 MPa and also the modulus of elasticity increased from 29801 MPa for steel fiber-waste aggregate concrete to 33879 MPa for waste aggregate-steel fiber concrete improved with waterproof admixture.
International Journal of Civil Engineering and Technology, Jul 2018
The current study offers the finite element application on a rigid apron pavement to get develope... more The current study offers the finite element application on a rigid apron pavement to get developed tensile stresses and strains due to huge aircraft gross weight. FAAFIELD software was utilized to design the apron layers for International Al-Najaf airport. The ANSYS 14 finite element software program is applied in testing of the design parameters of rigid pavement airport structures. Two 3D-FEM are utilized to model plain and reinforced concrete slab supported by several elastic springs which rigidity is presented by the modulus of subgrade reaction denoted by (k). The extreme tensile stress has been gotten at the beneath of concrete panel slab under various cases of material properties and heavy aircraft landing gear loading. Furthermore, statistics model related maximum tensile stress as dependent variable with elastic modulus and thickness of concrete panel, and modulus of subgrade reaction has been developed by using SPSS version 23.
International Journal of Civil Engineering and Technology, Oct 21, 2018
Fiber reinforced concrete is widely used in concrete structures, it has several benefits like inc... more Fiber reinforced concrete is widely used in concrete structures, it has several benefits like increasing tensile, compressive, flexural strength and modulus of elasticity and also increases ductility and toughness of concrete. This research aims to improve the mechanical properties of concrete by using polyethylene fibers obtained from plastic cans, higher tensile and flexural strength obtained by using this type of fiber. This Polyethylene fiber is more durable than other types of fibers since it does not rust with time like steel fibers types. Compressive strength in this research increased from 37.4 MPa to 49.3 MPa, flexural strength increased from 3.5 MPa to 9.89 MPa, and tensile strength increased from 2.9 MPa to 5.1 MPa.
International Journal of Civil Engineering and Technology, Sep 2018
Lean concrete mixes is a concrete mix with low cement content and high percentages of aggregates,... more Lean concrete mixes is a concrete mix with low cement content and high percentages of aggregates, it used in several works such as the blinding concrete under foundations and as leveling course below footings or in mass concrete such as dams. The need to make this layer of concrete in more strength and more durable is important, using polymers such as styrene butadiene rubber (SBR) in concrete improve the mechanical strength of concrete and durability and make concrete permeability very low, and also using silica-fume powder leads also to improve the strength of concrete. This investigation studies the effect of using styrene butadiene rubber polymer in different percentages and also silica fume to lean mixes to improve the mechanical properties. Mixes with 10% polymers gives the highest values of mechanical properties with 10 % silica fume , it gives average compressive strength of 24.3 MPa while in reference mix give 13.2 MPa , the flexural strength also increased from 1.24 MPa for lean mixes to 4.8 MPa to silica-polymer mixes .the main reason for using polymers and silica fume is because of these two materials reduce the heat of hydration during mixing and casting concrete, so that is very important in mass concrete.
Journal of University of Babylon for Engineering Sciences, 2018
Permeable paving has been vastly utilized as an alternate to traditional impervious hard surfaces... more Permeable paving has been vastly utilized as an alternate to traditional impervious hard surfaces, such as street, parking lots, sidewalk and pedestrian areas. This leads to several rain water management and environmental advantage. Therefore, this study has focused on brief the wide-range of permeable pavement systems. These types of permeable pavements have been reviewed in addition to the usefulness of each kind. The results indicated the potential of using such kind in different locations in Iraq is more likely such as Al-Najaf city. Several points of soil investigations have been conducted by previous studies within Al-Najaf city (boundary of Al-Najaf Municipal) prove that Al-Najfa soil is sandy soil. These tested points also demonstrate that the soil characteristics of the city are so suitable for such type of pavement.