ahid hamoodi - Academia.edu (original) (raw)

Papers by ahid hamoodi

Research paper thumbnail of Properties of pervious concrete made from graded and single size crushed coarse aggregate

Periodicals of Engineering and Natural Sciences (PEN), Jun 24, 2021

The current search is aimed to investigate the properties of the pervious concrete cast from grad... more The current search is aimed to investigate the properties of the pervious concrete cast from graded and single size coarse aggregate. A total of 18 mixes, nine mixes for each type, were designed, cast and sampled. The properties concerning compressive strength, flexural strength, density and porosity were discussed. The influence of aggregate type, water-cement ratio (w/c) and coarse aggregate to cement content ratio (CA/C) on the characteristics of pervious concrete was tested. Three w/c (0.3, 0.35 and 0.4) were used in each type of pervious concrete. For each w/c, three CA/C (3.5, 4.0 and 4.5) were employed. Besides, relationships between compressive and flexural strength, compressive strength and density, compressive strength and porosity and between density and porosity were developed and discussed. The experimental results prove that both types of pervious concrete have the usual tendency regarding the properties. At the same time, the tests of compressive strength, flexural strength and density reflect the reduced mechanical characteristics of pervious concrete in comparison to normal concrete. The density of the tested specimens decreased with increasing porosity up to 22% and 32% for graded and single size aggregate pervious concrete respectively, and then it continued approximately stable.

Research paper thumbnail of Shear Strength of Reinforced Recycled Aggregate Concrete Corbels

Journal of engineering, Aug 11, 2021

is paper is related to a laboratory program for the shear strength of reinforced concrete corbels... more is paper is related to a laboratory program for the shear strength of reinforced concrete corbels (RCC) cast with or without recycled aggregate (RA) by investigating the main parameters affecting the corbels behavior including the replacement aggregate recycling ratio, fcu, and shear span to effective depth ratio a/d. Eight specimens were cast and tested. e obtained results were compared with ACI and EC2 codes. It is found that the ACI code and E2 code give sensibly conservative results when compared with the findings of the present work for all tested specimens regarding RA, concrete strength, and a/d. Also, the experimental results show that the presence of recycled aggregate decreases slightly both cracking and failure loads. Furthermore, the failure load development due to the effect of compressive strength is more effective with the presence of recycled aggregate, and the 50% ratio of RA was the suitable ratio in elaborate crack and failure loads. Finally, the reduction of the span-depth ratio (from 0.50 to 0.35) increases the crack and failure load by 8.1% and 20.2%, respectively, leading to confirm that the corbel strength is much sensitive to decreasing span-depth ratio compared to the associated deflections.

Research paper thumbnail of Shear Strength of Reinforced Recycled Aggregate Concrete Corbels

Journal of Engineering

This paper is related to a laboratory program for the shear strength of reinforced concrete corbe... more This paper is related to a laboratory program for the shear strength of reinforced concrete corbels (RCC) cast with or without recycled aggregate (RA) by investigating the main parameters affecting the corbels behavior including the replacement aggregate recycling ratio, fcu, and shear span to effective depth ratio a/d. Eight specimens were cast and tested. The obtained results were compared with ACI and EC2 codes. It is found that the ACI code and E2 code give sensibly conservative results when compared with the findings of the present work for all tested specimens regarding RA, concrete strength, and a/d. Also, the experimental results show that the presence of recycled aggregate decreases slightly both cracking and failure loads. Furthermore, the failure load development due to the effect of compressive strength is more effective with the presence of recycled aggregate, and the 50% ratio of RA was the suitable ratio in elaborate crack and failure loads. Finally, the reduction of ...

Research paper thumbnail of Effect of types of fibres on the shear behaviour of deep beam with opening

Periodicals of Engineering and Natural Sciences (PEN), 2021

This paper discusses experiments on the behaviour of deep beams with and without opening in the s... more This paper discusses experiments on the behaviour of deep beams with and without opening in the styles of stainless-steel fibres under a two-point load test. Triple varieties of stainless-steel fibre used constant fibre fraction (1 percent) by volume of concrete, (straight, hooked and corrugated steel fibre)). In this analysis, the key parameters were the fibre forms and the influence of the opening on the behaviour. The results show that the steel fibres raise the first crack and final loads in both groups (first group without opening the second group with opening). Besides, an increase of (20.6 to 40.5) % in first cracking load for the first group and (36.4 to 56.7) % for the second group and an increase of (59.5 to 110.1) % and (20.2 to 28.8) % in ultimate load for first and second groups respectively.

Research paper thumbnail of Properties of pervious concrete made from graded and single size crushed coarse aggregate

Periodicals of Engineering and Natural Sciences (PEN), 2021

The current search is aimed to investigate the properties of the pervious concrete cast from grad... more The current search is aimed to investigate the properties of the pervious concrete cast from graded and single size coarse aggregate. A total of 18 mixes, nine mixes for each type, were designed, cast and sampled. The properties concerning compressive strength, flexural strength, density and porosity were discussed. The influence of aggregate type, water-cement ratio (w/c) and coarse aggregate to cement content ratio (CA/C) on the characteristics of pervious concrete was tested. Three w/c (0.3, 0.35 and 0.4) were used in each type of pervious concrete. For each w/c, three CA/C (3.5, 4.0 and 4.5) were employed. Besides, relationships between compressive and flexural strength, compressive strength and density, compressive strength and porosity and between density and porosity were developed and discussed. The experimental results prove that both types of pervious concrete have the usual tendency regarding the properties. At the same time, the tests of compressive strength, flexural strength and density reflect the reduced mechanical characteristics of pervious concrete in comparison to normal concrete. The density of the tested specimens decreased with increasing porosity up to 22% and 32% for graded and single size aggregate pervious concrete respectively, and then it continued approximately stable.

Research paper thumbnail of Geotechnical Features of Basrah City, Iraq

Basrah journal for engineering science, 2020

Basrah is considered as the economic capital of Iraq. In recent years, it showed a rapid growth i... more Basrah is considered as the economic capital of Iraq. In recent years, it showed a rapid growth in population and, accordingly, an increasing investment in construction industries. This paper presents information about the geotechnical characteristics of Basrah soil. For this purpose, geotechnical data have been collected covering wide areas of the city. The study area was divided into two zones, one of them was further divided into three subzones. For each of the zones considered, geotechnical information including typical soil profiles, Standard Penetration Test (SPT-N) values, Atterberg limits, sieve analysis results, consolidation test results and other physical aspects were given. Furthermore, chemical analysis of Basrah soil was also presented. According to field and laboratory results, soils in this region can be classified into two distinct zones. The eastern zone, which mainly forms of soft and medium cohesion soils extended from the soil surface down to a depth of (16 – 26...

Research paper thumbnail of Shear Behavior of Fiber-Reinforced Concrete Beams: An Experimental Study

International Journal of GEOMATE, 2021

Eight steel fiber-reinforced normal strength concrete beams (200 mm wide, 250 mm deep and 1500 mm... more Eight steel fiber-reinforced normal strength concrete beams (200 mm wide, 250 mm deep and 1500 mm long) were tested in bending under two concentrated loads, without and with stirrups. The concrete beams were designed to have marked shear behavior. Three types of steel fibers (SFs), straight, hooked and corrugated, were investigated as a possible replacement for standard transverse reinforcement. The fiber volume content, the aspect ratio of fibers, and the existence of stirrups were the major testing parameters in this regard. Four fiber volume proportions (R f of 0%, 0.5%, 1.0% and 1.5%) and three aspect ratios (l/d of 50, 55 and 60) were utilized. According to the experimental data, the shear behavior of steel fiber-reinforced normal strength concrete beams (SFRCBs) without stirrups was similar, if not superior, to that of normal strength concrete beams (RCBs) with stirrup reinforcement. The SFRCBs displayed extremely thin diagonal cracks and higher shear strengths, especially for fiber fractions of 1% and 1.5%. The experimental results were compared to major universal codes and existing models from the literature. The major codes undervalue the concrete contribution to shear strength while exaggerating the contribution of the stirrups. Furthermore, some of the existing models overestimate the fibers' contribution to the shear strength, while others underestimate it when compared to the present experimental findings.

Research paper thumbnail of Properties of pervious concrete made from graded and single size crushed coarse aggregate

Periodicals of Engineering and Natural Sciences (PEN), Jun 24, 2021

The current search is aimed to investigate the properties of the pervious concrete cast from grad... more The current search is aimed to investigate the properties of the pervious concrete cast from graded and single size coarse aggregate. A total of 18 mixes, nine mixes for each type, were designed, cast and sampled. The properties concerning compressive strength, flexural strength, density and porosity were discussed. The influence of aggregate type, water-cement ratio (w/c) and coarse aggregate to cement content ratio (CA/C) on the characteristics of pervious concrete was tested. Three w/c (0.3, 0.35 and 0.4) were used in each type of pervious concrete. For each w/c, three CA/C (3.5, 4.0 and 4.5) were employed. Besides, relationships between compressive and flexural strength, compressive strength and density, compressive strength and porosity and between density and porosity were developed and discussed. The experimental results prove that both types of pervious concrete have the usual tendency regarding the properties. At the same time, the tests of compressive strength, flexural strength and density reflect the reduced mechanical characteristics of pervious concrete in comparison to normal concrete. The density of the tested specimens decreased with increasing porosity up to 22% and 32% for graded and single size aggregate pervious concrete respectively, and then it continued approximately stable.

Research paper thumbnail of Shear Strength of Reinforced Recycled Aggregate Concrete Corbels

Journal of engineering, Aug 11, 2021

is paper is related to a laboratory program for the shear strength of reinforced concrete corbels... more is paper is related to a laboratory program for the shear strength of reinforced concrete corbels (RCC) cast with or without recycled aggregate (RA) by investigating the main parameters affecting the corbels behavior including the replacement aggregate recycling ratio, fcu, and shear span to effective depth ratio a/d. Eight specimens were cast and tested. e obtained results were compared with ACI and EC2 codes. It is found that the ACI code and E2 code give sensibly conservative results when compared with the findings of the present work for all tested specimens regarding RA, concrete strength, and a/d. Also, the experimental results show that the presence of recycled aggregate decreases slightly both cracking and failure loads. Furthermore, the failure load development due to the effect of compressive strength is more effective with the presence of recycled aggregate, and the 50% ratio of RA was the suitable ratio in elaborate crack and failure loads. Finally, the reduction of the span-depth ratio (from 0.50 to 0.35) increases the crack and failure load by 8.1% and 20.2%, respectively, leading to confirm that the corbel strength is much sensitive to decreasing span-depth ratio compared to the associated deflections.

Research paper thumbnail of Shear Strength of Reinforced Recycled Aggregate Concrete Corbels

Journal of Engineering

This paper is related to a laboratory program for the shear strength of reinforced concrete corbe... more This paper is related to a laboratory program for the shear strength of reinforced concrete corbels (RCC) cast with or without recycled aggregate (RA) by investigating the main parameters affecting the corbels behavior including the replacement aggregate recycling ratio, fcu, and shear span to effective depth ratio a/d. Eight specimens were cast and tested. The obtained results were compared with ACI and EC2 codes. It is found that the ACI code and E2 code give sensibly conservative results when compared with the findings of the present work for all tested specimens regarding RA, concrete strength, and a/d. Also, the experimental results show that the presence of recycled aggregate decreases slightly both cracking and failure loads. Furthermore, the failure load development due to the effect of compressive strength is more effective with the presence of recycled aggregate, and the 50% ratio of RA was the suitable ratio in elaborate crack and failure loads. Finally, the reduction of ...

Research paper thumbnail of Effect of types of fibres on the shear behaviour of deep beam with opening

Periodicals of Engineering and Natural Sciences (PEN), 2021

This paper discusses experiments on the behaviour of deep beams with and without opening in the s... more This paper discusses experiments on the behaviour of deep beams with and without opening in the styles of stainless-steel fibres under a two-point load test. Triple varieties of stainless-steel fibre used constant fibre fraction (1 percent) by volume of concrete, (straight, hooked and corrugated steel fibre)). In this analysis, the key parameters were the fibre forms and the influence of the opening on the behaviour. The results show that the steel fibres raise the first crack and final loads in both groups (first group without opening the second group with opening). Besides, an increase of (20.6 to 40.5) % in first cracking load for the first group and (36.4 to 56.7) % for the second group and an increase of (59.5 to 110.1) % and (20.2 to 28.8) % in ultimate load for first and second groups respectively.

Research paper thumbnail of Properties of pervious concrete made from graded and single size crushed coarse aggregate

Periodicals of Engineering and Natural Sciences (PEN), 2021

The current search is aimed to investigate the properties of the pervious concrete cast from grad... more The current search is aimed to investigate the properties of the pervious concrete cast from graded and single size coarse aggregate. A total of 18 mixes, nine mixes for each type, were designed, cast and sampled. The properties concerning compressive strength, flexural strength, density and porosity were discussed. The influence of aggregate type, water-cement ratio (w/c) and coarse aggregate to cement content ratio (CA/C) on the characteristics of pervious concrete was tested. Three w/c (0.3, 0.35 and 0.4) were used in each type of pervious concrete. For each w/c, three CA/C (3.5, 4.0 and 4.5) were employed. Besides, relationships between compressive and flexural strength, compressive strength and density, compressive strength and porosity and between density and porosity were developed and discussed. The experimental results prove that both types of pervious concrete have the usual tendency regarding the properties. At the same time, the tests of compressive strength, flexural strength and density reflect the reduced mechanical characteristics of pervious concrete in comparison to normal concrete. The density of the tested specimens decreased with increasing porosity up to 22% and 32% for graded and single size aggregate pervious concrete respectively, and then it continued approximately stable.

Research paper thumbnail of Geotechnical Features of Basrah City, Iraq

Basrah journal for engineering science, 2020

Basrah is considered as the economic capital of Iraq. In recent years, it showed a rapid growth i... more Basrah is considered as the economic capital of Iraq. In recent years, it showed a rapid growth in population and, accordingly, an increasing investment in construction industries. This paper presents information about the geotechnical characteristics of Basrah soil. For this purpose, geotechnical data have been collected covering wide areas of the city. The study area was divided into two zones, one of them was further divided into three subzones. For each of the zones considered, geotechnical information including typical soil profiles, Standard Penetration Test (SPT-N) values, Atterberg limits, sieve analysis results, consolidation test results and other physical aspects were given. Furthermore, chemical analysis of Basrah soil was also presented. According to field and laboratory results, soils in this region can be classified into two distinct zones. The eastern zone, which mainly forms of soft and medium cohesion soils extended from the soil surface down to a depth of (16 – 26...

Research paper thumbnail of Shear Behavior of Fiber-Reinforced Concrete Beams: An Experimental Study

International Journal of GEOMATE, 2021

Eight steel fiber-reinforced normal strength concrete beams (200 mm wide, 250 mm deep and 1500 mm... more Eight steel fiber-reinforced normal strength concrete beams (200 mm wide, 250 mm deep and 1500 mm long) were tested in bending under two concentrated loads, without and with stirrups. The concrete beams were designed to have marked shear behavior. Three types of steel fibers (SFs), straight, hooked and corrugated, were investigated as a possible replacement for standard transverse reinforcement. The fiber volume content, the aspect ratio of fibers, and the existence of stirrups were the major testing parameters in this regard. Four fiber volume proportions (R f of 0%, 0.5%, 1.0% and 1.5%) and three aspect ratios (l/d of 50, 55 and 60) were utilized. According to the experimental data, the shear behavior of steel fiber-reinforced normal strength concrete beams (SFRCBs) without stirrups was similar, if not superior, to that of normal strength concrete beams (RCBs) with stirrup reinforcement. The SFRCBs displayed extremely thin diagonal cracks and higher shear strengths, especially for fiber fractions of 1% and 1.5%. The experimental results were compared to major universal codes and existing models from the literature. The major codes undervalue the concrete contribution to shear strength while exaggerating the contribution of the stirrups. Furthermore, some of the existing models overestimate the fibers' contribution to the shear strength, while others underestimate it when compared to the present experimental findings.