Ali Hamad - Academia.edu (original) (raw)

Papers by Ali Hamad

Journal of King Saud University - Engineering Sciences, 2015

High performance lightweight foamed concrete (HPLWFC) have a structural strength with low density... more High performance lightweight foamed concrete (HPLWFC) have a structural strength with low density and high flowability. HPLWFC is used in modern concrete technology and extensively in the construction applications of high-rise buildings, long-span concrete structures and road sub-bases among others. This present work investigated the effect of size and shape specimen on the compressive strength of HPLWFC reinforced with glass fibres. Foam agent (organic material) was used to obtain lightweight concrete. The volume fractions of the glass fibres used were: 0.0%, 0.06%, 0.2%, 0.4%, and 0.6% by total volume of concrete. The fresh properties of HPLWFC were measured by flowability and fresh density tests. In this study, the size and shape of specimens used for compressive strength were cubes by size (150 Â 150 Â 150, 100 Â 100 Â 100 and 50 Â 50 Â 50 mm) and cylinders by size (150 Â 300 and 100 Â 200 mm). The results of HPLWFC mixes showed the increase in the compressive strength for all sizes of specimens with glass fibre content. The small size of specimens gave higher compressive strength in comparison with other sizes. The disparity in the compressive strength for two sizes and shapes (cubes and cylinders) were reduced with a rise in the volume fraction of the glass fibres.

International Journal of Materials Science and Engineering, 2014

Aerated lightweight concrete have many advantages when compared with conventional concrete such a... more Aerated lightweight concrete have many advantages when compared with conventional concrete such as advanced strength to weight ratio, lower coefficient of thermal expansion, and good sound insulation as a result of air voids within aerated concrete. This paper is attention to classified of aerated lightweight concrete into foamed concrete and autoclaved concrete. Also, it is exhibits the raw materials used in aerated concrete, types of agent, properties and applications. The production method is classified for each foamed and autoclaved concrete. The literature review of aerated lightweight properties is focuses on the porosity, permeability, compressive strength and splitting strength.  Index Terms-aerated concrete, cellular concrete, foamed concrete, autoclaved aerated concrete (AAC)

Engineering Reports, 2020

Researchers have continuously attempted to reduce and recycle construction waste. Ceramic waste i... more Researchers have continuously attempted to reduce and recycle construction waste. Ceramic waste is mainly a byproduct of the manufacturing process. About 25% of the waste is produced because of dimension defects or incurring problems throughout the industrial process. This article aims to highlight the alternative uses of ceramic waste. In this research, ceramic waste at a powder status is reduced to fine aggregates. Here, ceramic waste powder (CWP) is used in different ratios of 25%, 50%, 75%, and 100% replacing the fine aggregate weight. Aluminum powder is used to obtain aerated concrete (AC). Glass fibers are added in ratios of 1%, 1.5%, and 2% of cement weight to obtain a fiber‐reinforced AC. The unit weight, compressive strength, splitting tensile strength, and thermal conductivity are estimated. Furthermore, scanning electron microscopy is performed to investigate the microstructure features of the composite. The results exhibit better performance in compressive and splitting ...

This paper illustrates the performance of lightweight concrete using various amounts of expanded ... more This paper illustrates the performance of lightweight concrete using various amounts of expanded polystyrene beads (EPS) and different amounts of foam agent to produce lightweight concrete. The objective of this paper is to produce lightweight concrete with good workability and strength, by different mix proportion of foam agent (0.4, 0.6, 0.8, 1, 1.2 kg/m 3) and varying water cement ratio (w/c) depending on the flow. Besides, various proportions using different percentages of EPS in order of volume fractions are used. The flow range used in the study is 110-130%. Each mix proportion is tested for compressive strength, modulus of rupture, density and voids ratio. The results gives acceptable ranges of strength for lightweight concrete produced by the inclusions of EPS beads and foam concrete. Therefore, the lightweight concrete produced in this work can be used for structural applications like multistory building frames, floors, bridges and prestressed or precast elements.

High performance lightweight foamed concrete has the same mechanical properties of normal weight ... more High performance lightweight foamed concrete has the same mechanical properties of normal weight concrete (conventional concrete). The main applications are void filling, bridge abutments, bridge decks, marine structures, frame buildings, roads, sewer systems, roofing, walls, and floors. However, concrete is extensive brittleness and considered weak material in tension. Glass fibers are used as additive to the lightweight foamed concrete to increase the energy absorption capacity. The work was prepared to investigate the effect of glass fibers on tensile properties of lightweight foamed concrete with different volume fraction of glass fibers (0.06, 0.2, 0.4 and 0.6%) by the testing fresh density, dry density, flowability, compressive strength, direct tensile strength and splitting tensile strength. The results showed that a reduction in flowability was obtained with increased glass fibers content. Besides, the fresh and dry densities increased with the addition of glass fibers. Also, significant enhancements in compressive strength, direct tensile strength and splitting tensile strength were got by glass fibers inclusion. Thus, the increase of compressive strength, direct tensile strength and splitting tensile strength were up to the 56.6%, 50% and 46%, respectively, due to 0.6% glass fibers. 1. Introduction Aerated concrete is known as lightweight foamed concrete (LWFC). LWFC is lighter than normal weight concrete by mixing foams into cement slurry, LWFC has been a very recognized material with its noticeable characteristics particularly in thermal insulation with a low thermal conductivity between 0.10 W/mK to 0.66 W/mK [1,2]. Density of foam concrete about (400 to 1600 kg/m 3) depending on proportion of foam agent and water, foam concrete can be using for structural application, partition, insulation and filling grades [2]. The structural lightweight concrete having bulk density lower than 1950 Kg/m 3 and compressive strength more than 17 MPa. The structural lightweight concrete is 25% lighter than normal-weight concrete with a compressive strength up to 60 MPa [3]. The main reason of using lightweight concrete for structural purposes is to reduce the self-weight of concrete structures. Reducing the dead load of the structure is very important in earthquake regions, for tall buildings, and special concrete structures [4]. The Concrete is substantial brittleness, and which results in poor fracture toughness, poor resistance to crack propagation, and low impact strength. This inherent brittleness has limited their application in fields requiring high impact, vibration and fracture strengths. Concrete with fibers have wide range of usage due to their obvious advantages over ordinary concrete. The function of the use fibers in concrete to enhance the mechanical properties of concrete. Fibers are used to modify the tensile and flexural strengths, toughness, impact resistance, fracture energy, arrest crack formation and propagation, and thus improve strength and ductility. The concrete with fiber as additive are used widely in highways, tunnel linings, concrete pipes, reinforced concrete frames, reinforced concrete beam members, shell roof systems, skyscrapers and pre-stressed concrete, light shell constructions, domes and folded plates in recent years [5-9]. (Ghorpade, 2010) [10] investigated the effect of glass fiber on high performance concrete with silica fume as admixture. The length of fiber is 12mm and the specific gravity of the fiber is 2.68. Glass fibers by 0, 0.5, 1.0, and 1.5 % to produce high performance concrete. The maximum percentage increase in compressive strength is observed at 1% fiber and 10% silica fume. The flexural strength is increased up to 1% of fiber volume then the strength is decreased. It is also observed that the use of glass fiber up to 1.0% percentage increases the splitting tensile strength. (Murthy et al., 2012) [11] studied the performance of glass fiber reinforced concrete. The results shows the increase in compressive strength is nominal while the flexural strength increased significantly as expected with the increase in percentage of glass fiber. Also, significant reduction in the slump value of the glass fiber reinforced concrete was observed with increase in glass fiber content. (Chandramouli et al., 2010) [12] founded the addition of glass fibers to concrete enhance the mechanical properties of the concrete. Significance improved in the compressive strength, flexural strength and splitting tensile strength due addition 0.03% glass fibers.

High performance lightweight foamed concrete (HPLWFC) have a structural strength with low density... more High performance lightweight foamed concrete (HPLWFC) have a structural strength with low density and high flowability. HPLWFC is used in modern concrete technology and extensively in the construction applications of high-rise buildings, long-span concrete structures and road sub-bases among others. This present work investigated the effect of size and shape specimen on the compressive strength of HPLWFC reinforced with glass fibres. Foam agent (organic material) was used to obtain lightweight concrete. The volume fractions of the glass fibres used were: 0.0%, 0.06%, 0.2%, 0.4%, and 0.6% by total volume of concrete. The fresh properties of HPLWFC were measured by flowability and fresh density tests. In this study, the size and shape of specimens used for compressive strength were cubes by size (150 Â 150 Â 150, 100 Â 100 Â 100 and 50 Â 50 Â 50 mm) and cylinders by size (150 Â 300 and 100 Â 200 mm). The results of HPLWFC mixes showed the increase in the compressive strength for all sizes of specimens with glass fibre content. The small size of specimens gave higher compressive strength in comparison with other sizes. The disparity in the compressive strength for two sizes and shapes (cubes and cylinders) were reduced with a rise in the volume fraction of the glass fibres.

Journal of King Saud University - Engineering Sciences, 2015

High performance lightweight foamed concrete (HPLWFC) have a structural strength with low density... more High performance lightweight foamed concrete (HPLWFC) have a structural strength with low density and high flowability. HPLWFC is used in modern concrete technology and extensively in the construction applications of high-rise buildings, long-span concrete structures and road sub-bases among others. This present work investigated the effect of size and shape specimen on the compressive strength of HPLWFC reinforced with glass fibres. Foam agent (organic material) was used to obtain lightweight concrete. The volume fractions of the glass fibres used were: 0.0%, 0.06%, 0.2%, 0.4%, and 0.6% by total volume of concrete. The fresh properties of HPLWFC were measured by flowability and fresh density tests. In this study, the size and shape of specimens used for compressive strength were cubes by size (150 Â 150 Â 150, 100 Â 100 Â 100 and 50 Â 50 Â 50 mm) and cylinders by size (150 Â 300 and 100 Â 200 mm). The results of HPLWFC mixes showed the increase in the compressive strength for all sizes of specimens with glass fibre content. The small size of specimens gave higher compressive strength in comparison with other sizes. The disparity in the compressive strength for two sizes and shapes (cubes and cylinders) were reduced with a rise in the volume fraction of the glass fibres.

International Journal of Materials Science and Engineering, 2014

Aerated lightweight concrete have many advantages when compared with conventional concrete such a... more Aerated lightweight concrete have many advantages when compared with conventional concrete such as advanced strength to weight ratio, lower coefficient of thermal expansion, and good sound insulation as a result of air voids within aerated concrete. This paper is attention to classified of aerated lightweight concrete into foamed concrete and autoclaved concrete. Also, it is exhibits the raw materials used in aerated concrete, types of agent, properties and applications. The production method is classified for each foamed and autoclaved concrete. The literature review of aerated lightweight properties is focuses on the porosity, permeability, compressive strength and splitting strength.  Index Terms-aerated concrete, cellular concrete, foamed concrete, autoclaved aerated concrete (AAC)

Engineering Reports, 2020

Researchers have continuously attempted to reduce and recycle construction waste. Ceramic waste i... more Researchers have continuously attempted to reduce and recycle construction waste. Ceramic waste is mainly a byproduct of the manufacturing process. About 25% of the waste is produced because of dimension defects or incurring problems throughout the industrial process. This article aims to highlight the alternative uses of ceramic waste. In this research, ceramic waste at a powder status is reduced to fine aggregates. Here, ceramic waste powder (CWP) is used in different ratios of 25%, 50%, 75%, and 100% replacing the fine aggregate weight. Aluminum powder is used to obtain aerated concrete (AC). Glass fibers are added in ratios of 1%, 1.5%, and 2% of cement weight to obtain a fiber‐reinforced AC. The unit weight, compressive strength, splitting tensile strength, and thermal conductivity are estimated. Furthermore, scanning electron microscopy is performed to investigate the microstructure features of the composite. The results exhibit better performance in compressive and splitting ...

This paper illustrates the performance of lightweight concrete using various amounts of expanded ... more This paper illustrates the performance of lightweight concrete using various amounts of expanded polystyrene beads (EPS) and different amounts of foam agent to produce lightweight concrete. The objective of this paper is to produce lightweight concrete with good workability and strength, by different mix proportion of foam agent (0.4, 0.6, 0.8, 1, 1.2 kg/m 3) and varying water cement ratio (w/c) depending on the flow. Besides, various proportions using different percentages of EPS in order of volume fractions are used. The flow range used in the study is 110-130%. Each mix proportion is tested for compressive strength, modulus of rupture, density and voids ratio. The results gives acceptable ranges of strength for lightweight concrete produced by the inclusions of EPS beads and foam concrete. Therefore, the lightweight concrete produced in this work can be used for structural applications like multistory building frames, floors, bridges and prestressed or precast elements.

High performance lightweight foamed concrete has the same mechanical properties of normal weight ... more High performance lightweight foamed concrete has the same mechanical properties of normal weight concrete (conventional concrete). The main applications are void filling, bridge abutments, bridge decks, marine structures, frame buildings, roads, sewer systems, roofing, walls, and floors. However, concrete is extensive brittleness and considered weak material in tension. Glass fibers are used as additive to the lightweight foamed concrete to increase the energy absorption capacity. The work was prepared to investigate the effect of glass fibers on tensile properties of lightweight foamed concrete with different volume fraction of glass fibers (0.06, 0.2, 0.4 and 0.6%) by the testing fresh density, dry density, flowability, compressive strength, direct tensile strength and splitting tensile strength. The results showed that a reduction in flowability was obtained with increased glass fibers content. Besides, the fresh and dry densities increased with the addition of glass fibers. Also, significant enhancements in compressive strength, direct tensile strength and splitting tensile strength were got by glass fibers inclusion. Thus, the increase of compressive strength, direct tensile strength and splitting tensile strength were up to the 56.6%, 50% and 46%, respectively, due to 0.6% glass fibers. 1. Introduction Aerated concrete is known as lightweight foamed concrete (LWFC). LWFC is lighter than normal weight concrete by mixing foams into cement slurry, LWFC has been a very recognized material with its noticeable characteristics particularly in thermal insulation with a low thermal conductivity between 0.10 W/mK to 0.66 W/mK [1,2]. Density of foam concrete about (400 to 1600 kg/m 3) depending on proportion of foam agent and water, foam concrete can be using for structural application, partition, insulation and filling grades [2]. The structural lightweight concrete having bulk density lower than 1950 Kg/m 3 and compressive strength more than 17 MPa. The structural lightweight concrete is 25% lighter than normal-weight concrete with a compressive strength up to 60 MPa [3]. The main reason of using lightweight concrete for structural purposes is to reduce the self-weight of concrete structures. Reducing the dead load of the structure is very important in earthquake regions, for tall buildings, and special concrete structures [4]. The Concrete is substantial brittleness, and which results in poor fracture toughness, poor resistance to crack propagation, and low impact strength. This inherent brittleness has limited their application in fields requiring high impact, vibration and fracture strengths. Concrete with fibers have wide range of usage due to their obvious advantages over ordinary concrete. The function of the use fibers in concrete to enhance the mechanical properties of concrete. Fibers are used to modify the tensile and flexural strengths, toughness, impact resistance, fracture energy, arrest crack formation and propagation, and thus improve strength and ductility. The concrete with fiber as additive are used widely in highways, tunnel linings, concrete pipes, reinforced concrete frames, reinforced concrete beam members, shell roof systems, skyscrapers and pre-stressed concrete, light shell constructions, domes and folded plates in recent years [5-9]. (Ghorpade, 2010) [10] investigated the effect of glass fiber on high performance concrete with silica fume as admixture. The length of fiber is 12mm and the specific gravity of the fiber is 2.68. Glass fibers by 0, 0.5, 1.0, and 1.5 % to produce high performance concrete. The maximum percentage increase in compressive strength is observed at 1% fiber and 10% silica fume. The flexural strength is increased up to 1% of fiber volume then the strength is decreased. It is also observed that the use of glass fiber up to 1.0% percentage increases the splitting tensile strength. (Murthy et al., 2012) [11] studied the performance of glass fiber reinforced concrete. The results shows the increase in compressive strength is nominal while the flexural strength increased significantly as expected with the increase in percentage of glass fiber. Also, significant reduction in the slump value of the glass fiber reinforced concrete was observed with increase in glass fiber content. (Chandramouli et al., 2010) [12] founded the addition of glass fibers to concrete enhance the mechanical properties of the concrete. Significance improved in the compressive strength, flexural strength and splitting tensile strength due addition 0.03% glass fibers.

High performance lightweight foamed concrete (HPLWFC) have a structural strength with low density... more High performance lightweight foamed concrete (HPLWFC) have a structural strength with low density and high flowability. HPLWFC is used in modern concrete technology and extensively in the construction applications of high-rise buildings, long-span concrete structures and road sub-bases among others. This present work investigated the effect of size and shape specimen on the compressive strength of HPLWFC reinforced with glass fibres. Foam agent (organic material) was used to obtain lightweight concrete. The volume fractions of the glass fibres used were: 0.0%, 0.06%, 0.2%, 0.4%, and 0.6% by total volume of concrete. The fresh properties of HPLWFC were measured by flowability and fresh density tests. In this study, the size and shape of specimens used for compressive strength were cubes by size (150 Â 150 Â 150, 100 Â 100 Â 100 and 50 Â 50 Â 50 mm) and cylinders by size (150 Â 300 and 100 Â 200 mm). The results of HPLWFC mixes showed the increase in the compressive strength for all sizes of specimens with glass fibre content. The small size of specimens gave higher compressive strength in comparison with other sizes. The disparity in the compressive strength for two sizes and shapes (cubes and cylinders) were reduced with a rise in the volume fraction of the glass fibres.