International Journal of Engineering and Management Research, 2018
Despite of different definitions of organizational culture, shared meanings, assumptions, beliefs... more Despite of different definitions of organizational culture, shared meanings, assumptions, beliefs and understandings held by a team are considered as the basic component of the organizational culture definition. Organizational culture gives identity to an organization. Nowadays with the increasing of the internationalization of the construction industry, the organizational culture become more importance than any other times. The aim of this research is to investigate the importance of the organizational culture for Gaza Strip construction companies. The study used a questionnaire that was administered by contracting companies classified at the Palestinian Contractors Union. Out of 134 questionnaires were distributed, only 74 questionnaires were received. The research found out that the existence of the organizational cultural in the organization is very important for its survival and continuity, where the organizational cultural help in achieving the organization goals, the organizational cultural help the organization to take right actions and decisions, the organizational cultural help in creating policies and assignments to increase profitability, growth, and respond to market demands, the organizational cultural help the individuals and teams to do the assigned work efficiently, and the organizational cultural play basic role in sharing of information rapidly inside the organization.
Environmental Science and Pollution Research, Jan 19, 2022
The purpose of this study is to demonstrate the impact of incorporating two different types of gr... more The purpose of this study is to demonstrate the impact of incorporating two different types of green nanomaterials (sugarcane and eggshell) on destructive and non-destructive properties of mortar. Nano sugarcane (NSC) was manufactured by calcining sugarcane at temperatures of 600 °C for 3 h. On the other hand, nano eggshell (NES) was manufactured by calcining eggshell at temperatures of 600 °C for 6 h. The sugarcane ash and eggshell ash were then milled to nano size. The final nano-sized product replaced Portland cement with different dosages of 2, 4 and 6%. Sixteen mortar mixtures were designed and prepared using only NSC or only NES or a combined hybrid of NSC and NES. Consistency, compressive strength, flexural strength and microstructure analysis (scanning electron microscopy and energy-dispersive X-ray) tests were conducted to investigate the influence of replacement materials on the performance and properties of mortars. The results showed that the use of nano sugarcane and nano eggshell enhanced the compressive strength and reduced permeability of green mortar due to the micropore structure. At the ages of 7 and 28 days, mortars containing a replacement ratio of 2% (0.5% NSC + 1.5% NES) had remarkably improved mechanical properties, and the improvement in compressive strength reached 21.3% and flexural strength to 10.08% when compared to the control sample. The efficiency of NSC and NES in increasing mortar strength was also confirmed by microstructure analysis.
Building Information Modeling (BIM) is the best tool to improve construction processes. However, ... more Building Information Modeling (BIM) is the best tool to improve construction processes. However, BIM did not implement successfully. So, solving these issue needs a better knowledge about Critical Success Factors (CSFs).
Case Studies in Construction Materials, Dec 1, 2022
ultrahigh-performance concrete is a type of advanced concrete that can improve the resilience and... more ultrahigh-performance concrete is a type of advanced concrete that can improve the resilience and durability of concrete structures. The utilization of available supplementary cementitious materials is a critical step in saving energy and materials, as well as lowering the cost of concrete. This research investigated the impact of sand grain size distribution, supplementary cementitious materials, and curing regimes (CRs) on the compressive strength of ultrahigh-performance concrete. The findings showed that a 90-d strength of 175 MPa could be obtained with a microsilica volume of 5 % and without heat-curing. The highest strength was obtained after curing for 48 h at 60 °C, followed by 72 h at 90 °C. Moreover, when compared to natural grain size distribution sand, the usage of finer sand enhances compressive strength. When microsilica is added, however, this impact is minimized.
Recycling glass waste for developing sustainable cementitious mortar and concrete have recently a... more Recycling glass waste for developing sustainable cementitious mortar and concrete have recently attracted increasing attentions for the construction industry. From another aspect, the nitrate-based environment due to chemical fertilizers has a significant effect on reinforced concrete and normal concrete by producing damages like its microstructure, corrosion of reinforcement. The major goal of this research work is to study the effect of Ammonium Nitrate (NH4NO3) on the unite weight and strength of glass mortar by performing experimental tests. In this article, eco-friendly mortar containing recycled glass powder (GP), as a replacement to cement, is submerged in NH4NO3 solutions. In total, 60 cement mortar mixtures were proportioned in this research work used GP passing sieves 200 µm. NH4NO3 solutions with 5, 10, and 20% concentration, and three different exposure periods 10, 30, and 60 days were applied. The experimental results showed that the effect of NH4NO3 on the density of mortar containing GP is less critical than that of conventional mortar. After 60 days of immersion in the solution with a concentration of 20% NH4NO3, the reduction in density of glassy mortar is less than that of ordinary mortar. Furthermore, the results indicated that the maximum compressive strength was attained at 10% replacement level of cement with GP by approximately 60 MPa after 60 days of immersion in NH4NO3 solution.
Abstract This research presents a comparative study of different curing regimes, namely, standard... more Abstract This research presents a comparative study of different curing regimes, namely, standard curing (SC), internal curing (IC) with polyethylene glycol (PEG) and air curing (AC), used in ultrahigh-performance concrete (UHPC) premixed with different types of nanomaterials. Four types of nano waste materials were prepared, i.e. milled nano-metakaolin (NMK), nano waste glass (NWG) and nano rice husk ash (NRHA) and chemically prepared nano silica (NS). Several UHPC mixes with nanomaterial dosages (1%, 2% and 3%) were investigated. Compressive strength , ultrasonic pulse velocity , sulphate attack and microstructure were analysed. Results indicated the similarity between the performance of SC and IC in NS, NWG and NMK. Moreover, the addition of PEG exerted a negative effect on NRHA. Compressive strength increased by 17%, 24%, 14% and 13% under IC in NWG, NRH, NMK and NS, respectively. By contrast, sorptivity decreased by 84%, 60%, 48% and 60% in NS, NMK, NWG and NRHA under IC.
Abstract The punitive environmental legislation set by the global community has shifted the direc... more Abstract The punitive environmental legislation set by the global community has shifted the direction of research involve in construction industry towards the utilization of secondary raw materials in designing and constructing new structures. Rice husk (RH) is a by-product obtained from the rice mill process whose generation accounts up to 200 kg per ton of rice. The existing literature showed the vast potential of using rice husk ash (RHA) as a replacement for cement or as admixtures. This paper aims to critically review previous studies on RHA as a waste material. The utilization of this waste in concrete contributes to nurturing more sustainable and greener development, thereby lessen carbon footprints and minimize solid waste disposal issues. A state-of-the-art-review of literature on the use of RHA is presented in this paper. The impact of RHA on the properties of concrete such as workability, density, compressive strength, flexural strength, splitting tensile strength, modulus of elasticity, durability properties as well as its impact on sustainability are compiled. In addition, the technical results are complimented with the microstructural analysis evaluated through scanning electron microscopy (SEM). From the data garnered, it is postulated that RHA beneficially enhance the mechanical strengths coupled with improvement of resistant to sulfate and acid attack. This paper advances novel recommendations and directions for future research towards the application of green RHA-based construction products.
Abstract This work aims to highlight the effect of seven different types of nano rice husk ash (N... more Abstract This work aims to highlight the effect of seven different types of nano rice husk ash (NRHA) on the mechanical, ultrasonic pulse velocity, and durability of ultra-high-performance concrete (UHPC), whereby two different scenarios were applied. Rice husk ash (RHA) was manufactured by calcining rice husk at temperatures of 300, 500, 700 and 900 °C at a constant time of burning (for 3 h). Then, it was kept for cooling with a constant rate of 100/min and different burning hours of (9, 7, 5, and 3 h, respectively). After that, the product was milled to nano size. The final nano-sized product was added by different dosages (1–5%) with a 2% step to the UHPC mixture. Compressive, splitting tensile, and flexural strength were measured accordingly. Permeability was assessed by the sorptivity test; the ultrasonic pulse velocity test was also conducted. The results showed that the addition of NRHA enhanced the compressive strength and impermeability of UHPC due to the refined pore structure. For a constant burning duration, a significant improvement in compressive strength was observed at a burning temperature of 900 °C and 700 °C for 1% NRHA and at 500 °C and 300 °C for 3% and 5% NRHA. However, for a different burning duration, a significant improvement in compressive strength was recorded at a burning temperature of 700 °C and 500 °C for 3% NRHA, which was burnt for 5 h and 300 °C for 5% NRHA, which was burnt for 9 h. Sorptivity and ultra-sonic pulse velocity confirmed the results. Therefore, the advisable condition is burning at 700 °C for 5 h for more amorphous silica with medium energy compared to other mixes.
High-strength self-compacting concrete (HSSCC) is a special concrete that mixes self-compacting a... more High-strength self-compacting concrete (HSSCC) is a special concrete that mixes self-compacting and high-strength properties. The production of HSSCC may require a high cement content, which increases the cost and limits production. This research focuses on producing HSSCC using glass powder (GP) to reduce the cement content and absorb glass waste. In this research, the experimental study was conducted on the degree of eleven experimental mixtures for SCC samples. Two types of glass waste powder (bottle glass powder and window glass powder) were added as a partial substitute for cement in proportions 10-50% by weight of cement. To evaluate the performance of GP, tests on workability, compressive strength, and transport characteristics (Chloride Permeability, Sorptivity Coefficient, and Water Permeability) were performed. The results showed that adding GP to concrete improved its fresh properties, which met the requirements of EFNARC specifications. The results also showed that adding GP decreased compressive strength with an increase in replacement rates. On the other hand, the transport properties improved, and the water and chloride permeability decreased with GP compared to the reference mixture. Keywords: High-strength self-compacting concrete, bottle glass powder, window glass powder, fresh properties, compressive strength, transport properties
Case Studies in Construction Materials, Dec 1, 2022
The global expansion of agricultural production has increased the amount of agricultural waste (A... more The global expansion of agricultural production has increased the amount of agricultural waste (AW). Accordingly, AW should be disposed of properly to preserve the environment. This study focuses on using rice straw ash (RSA) and palm leaf ash (PLA) as partial replacement for cement in the production of ultrahigh-performance concrete (UHPC). In particular, this research investigates the effect of using RSA and PLA as pozzolanic materials on the microstructure and the fresh, mechanical and physical properties of UHPC. Eleven UHPC mixtures are prepared as control mixtures without RSA and PLA. Five mixtures are used with 10%, 20%, 30%, 40% and 50% RSA, whilst five residual mixtures contain 10%, 20%, 30%, 40% and 50% PLA. Results indicate the efficiency of RSA or PLA as a partial substitute (i.e. 20% of cement weight), with mechanical properties and durability better than those of the reference mixture. The microstructure analysis shows that 20% RSA or PLA yields denser concrete than the control mixture. The UHPC samples with 20% RSA and 20% PLA achieve the best results of 188.5 MPa and 185 MPa by increasing compressive strength by about 13.2% and 11.1%, respectively, compared with the control mixture at a test age of 28 days. Important mechanical properties, such as splitting tensile strength, flexural strength and modulus of elasticity, exhibit a trend similar to that of the compressive strength results for all the UHPC mixtures. The average values of splitting tensile strength and flexural strength at 28 days are about 11% and 14% of the compressive strength of the same UHPC mixtures, respectively. The significance of the current study is the relatively high cement replacement percentages of up to 50% by weight and the use of AW as replacement materials.
A sizeable amount of tire rubber waste is generated due to the increasing number of road automobi... more A sizeable amount of tire rubber waste is generated due to the increasing number of road automobile users all over the world. The accumulation of this waste in the open area poses environmental threats and therefore requires suitable treatments. The use of waste obtained from tire rubber as a construction material could contribute to a circular economy, while at the same time be an eco-friendly method of minimizing the depletion of raw materials used for the development of building materials. This study aims to show the impact of crumb rubber (CR) on the properties of concrete. This review covers the environmental consideration of fresh and hardened properties of composites developed using waste tires. The results show that the plastic nature of CR with suitable admixture led to increasing slump value and consequently enhanced the CR concrete workability.
Journal of materials research and technology, Mar 1, 2020
Please cite this article in press as: Alyaa A, et al. Investigating the behaviour of hybrid fibre... more Please cite this article in press as: Alyaa A, et al. Investigating the behaviour of hybrid fibre-reinforced reactive powder concrete beams after exposure to elevated temperatures.
The effect of partial replacement of sand by plastic waste on the mechanical properties of concre... more The effect of partial replacement of sand by plastic waste on the mechanical properties of concrete under impact load was investigated experimentally and numerically. Specimens were prepared with 0%, 5%, 10% and 20% plastic waste as sand replacements. For each case, three beams of 100 mm wide, 50 mm deep and 400 mm long were loaded to failure in a drop-weight impact machine by subjecting it to 30 N weight from 400 mm height after 90 days, while another three beams of the same size and age were tested under static load. The load-displacement and fracture energy of the plain and concrete with plastic beams subjected to static and impact loads were studied. The dynamic beam behavior was also analyzed numerically using the finite-element method (FEM) based LUSAS software. In general, the experimental results reveal that the impact tup increase by 39% with 20% sand replacement by plastic waste, while the static peak bending load always decreases. The concrete with plastic waste is stronger and more energy-absorbing under impact loading, than under static loading. The predicted load against displacement behaviors of both plain concrete and concrete with plastic waste, are well matched with the experimental results.
International Journal of Engineering and Management Research, 2018
Despite of different definitions of organizational culture, shared meanings, assumptions, beliefs... more Despite of different definitions of organizational culture, shared meanings, assumptions, beliefs and understandings held by a team are considered as the basic component of the organizational culture definition. Organizational culture gives identity to an organization. Nowadays with the increasing of the internationalization of the construction industry, the organizational culture become more importance than any other times. The aim of this research is to investigate the importance of the organizational culture for Gaza Strip construction companies. The study used a questionnaire that was administered by contracting companies classified at the Palestinian Contractors Union. Out of 134 questionnaires were distributed, only 74 questionnaires were received. The research found out that the existence of the organizational cultural in the organization is very important for its survival and continuity, where the organizational cultural help in achieving the organization goals, the organizational cultural help the organization to take right actions and decisions, the organizational cultural help in creating policies and assignments to increase profitability, growth, and respond to market demands, the organizational cultural help the individuals and teams to do the assigned work efficiently, and the organizational cultural play basic role in sharing of information rapidly inside the organization.
Environmental Science and Pollution Research, Jan 19, 2022
The purpose of this study is to demonstrate the impact of incorporating two different types of gr... more The purpose of this study is to demonstrate the impact of incorporating two different types of green nanomaterials (sugarcane and eggshell) on destructive and non-destructive properties of mortar. Nano sugarcane (NSC) was manufactured by calcining sugarcane at temperatures of 600 °C for 3 h. On the other hand, nano eggshell (NES) was manufactured by calcining eggshell at temperatures of 600 °C for 6 h. The sugarcane ash and eggshell ash were then milled to nano size. The final nano-sized product replaced Portland cement with different dosages of 2, 4 and 6%. Sixteen mortar mixtures were designed and prepared using only NSC or only NES or a combined hybrid of NSC and NES. Consistency, compressive strength, flexural strength and microstructure analysis (scanning electron microscopy and energy-dispersive X-ray) tests were conducted to investigate the influence of replacement materials on the performance and properties of mortars. The results showed that the use of nano sugarcane and nano eggshell enhanced the compressive strength and reduced permeability of green mortar due to the micropore structure. At the ages of 7 and 28 days, mortars containing a replacement ratio of 2% (0.5% NSC + 1.5% NES) had remarkably improved mechanical properties, and the improvement in compressive strength reached 21.3% and flexural strength to 10.08% when compared to the control sample. The efficiency of NSC and NES in increasing mortar strength was also confirmed by microstructure analysis.
Building Information Modeling (BIM) is the best tool to improve construction processes. However, ... more Building Information Modeling (BIM) is the best tool to improve construction processes. However, BIM did not implement successfully. So, solving these issue needs a better knowledge about Critical Success Factors (CSFs).
Case Studies in Construction Materials, Dec 1, 2022
ultrahigh-performance concrete is a type of advanced concrete that can improve the resilience and... more ultrahigh-performance concrete is a type of advanced concrete that can improve the resilience and durability of concrete structures. The utilization of available supplementary cementitious materials is a critical step in saving energy and materials, as well as lowering the cost of concrete. This research investigated the impact of sand grain size distribution, supplementary cementitious materials, and curing regimes (CRs) on the compressive strength of ultrahigh-performance concrete. The findings showed that a 90-d strength of 175 MPa could be obtained with a microsilica volume of 5 % and without heat-curing. The highest strength was obtained after curing for 48 h at 60 °C, followed by 72 h at 90 °C. Moreover, when compared to natural grain size distribution sand, the usage of finer sand enhances compressive strength. When microsilica is added, however, this impact is minimized.
Recycling glass waste for developing sustainable cementitious mortar and concrete have recently a... more Recycling glass waste for developing sustainable cementitious mortar and concrete have recently attracted increasing attentions for the construction industry. From another aspect, the nitrate-based environment due to chemical fertilizers has a significant effect on reinforced concrete and normal concrete by producing damages like its microstructure, corrosion of reinforcement. The major goal of this research work is to study the effect of Ammonium Nitrate (NH4NO3) on the unite weight and strength of glass mortar by performing experimental tests. In this article, eco-friendly mortar containing recycled glass powder (GP), as a replacement to cement, is submerged in NH4NO3 solutions. In total, 60 cement mortar mixtures were proportioned in this research work used GP passing sieves 200 µm. NH4NO3 solutions with 5, 10, and 20% concentration, and three different exposure periods 10, 30, and 60 days were applied. The experimental results showed that the effect of NH4NO3 on the density of mortar containing GP is less critical than that of conventional mortar. After 60 days of immersion in the solution with a concentration of 20% NH4NO3, the reduction in density of glassy mortar is less than that of ordinary mortar. Furthermore, the results indicated that the maximum compressive strength was attained at 10% replacement level of cement with GP by approximately 60 MPa after 60 days of immersion in NH4NO3 solution.
Abstract This research presents a comparative study of different curing regimes, namely, standard... more Abstract This research presents a comparative study of different curing regimes, namely, standard curing (SC), internal curing (IC) with polyethylene glycol (PEG) and air curing (AC), used in ultrahigh-performance concrete (UHPC) premixed with different types of nanomaterials. Four types of nano waste materials were prepared, i.e. milled nano-metakaolin (NMK), nano waste glass (NWG) and nano rice husk ash (NRHA) and chemically prepared nano silica (NS). Several UHPC mixes with nanomaterial dosages (1%, 2% and 3%) were investigated. Compressive strength , ultrasonic pulse velocity , sulphate attack and microstructure were analysed. Results indicated the similarity between the performance of SC and IC in NS, NWG and NMK. Moreover, the addition of PEG exerted a negative effect on NRHA. Compressive strength increased by 17%, 24%, 14% and 13% under IC in NWG, NRH, NMK and NS, respectively. By contrast, sorptivity decreased by 84%, 60%, 48% and 60% in NS, NMK, NWG and NRHA under IC.
Abstract The punitive environmental legislation set by the global community has shifted the direc... more Abstract The punitive environmental legislation set by the global community has shifted the direction of research involve in construction industry towards the utilization of secondary raw materials in designing and constructing new structures. Rice husk (RH) is a by-product obtained from the rice mill process whose generation accounts up to 200 kg per ton of rice. The existing literature showed the vast potential of using rice husk ash (RHA) as a replacement for cement or as admixtures. This paper aims to critically review previous studies on RHA as a waste material. The utilization of this waste in concrete contributes to nurturing more sustainable and greener development, thereby lessen carbon footprints and minimize solid waste disposal issues. A state-of-the-art-review of literature on the use of RHA is presented in this paper. The impact of RHA on the properties of concrete such as workability, density, compressive strength, flexural strength, splitting tensile strength, modulus of elasticity, durability properties as well as its impact on sustainability are compiled. In addition, the technical results are complimented with the microstructural analysis evaluated through scanning electron microscopy (SEM). From the data garnered, it is postulated that RHA beneficially enhance the mechanical strengths coupled with improvement of resistant to sulfate and acid attack. This paper advances novel recommendations and directions for future research towards the application of green RHA-based construction products.
Abstract This work aims to highlight the effect of seven different types of nano rice husk ash (N... more Abstract This work aims to highlight the effect of seven different types of nano rice husk ash (NRHA) on the mechanical, ultrasonic pulse velocity, and durability of ultra-high-performance concrete (UHPC), whereby two different scenarios were applied. Rice husk ash (RHA) was manufactured by calcining rice husk at temperatures of 300, 500, 700 and 900 °C at a constant time of burning (for 3 h). Then, it was kept for cooling with a constant rate of 100/min and different burning hours of (9, 7, 5, and 3 h, respectively). After that, the product was milled to nano size. The final nano-sized product was added by different dosages (1–5%) with a 2% step to the UHPC mixture. Compressive, splitting tensile, and flexural strength were measured accordingly. Permeability was assessed by the sorptivity test; the ultrasonic pulse velocity test was also conducted. The results showed that the addition of NRHA enhanced the compressive strength and impermeability of UHPC due to the refined pore structure. For a constant burning duration, a significant improvement in compressive strength was observed at a burning temperature of 900 °C and 700 °C for 1% NRHA and at 500 °C and 300 °C for 3% and 5% NRHA. However, for a different burning duration, a significant improvement in compressive strength was recorded at a burning temperature of 700 °C and 500 °C for 3% NRHA, which was burnt for 5 h and 300 °C for 5% NRHA, which was burnt for 9 h. Sorptivity and ultra-sonic pulse velocity confirmed the results. Therefore, the advisable condition is burning at 700 °C for 5 h for more amorphous silica with medium energy compared to other mixes.
High-strength self-compacting concrete (HSSCC) is a special concrete that mixes self-compacting a... more High-strength self-compacting concrete (HSSCC) is a special concrete that mixes self-compacting and high-strength properties. The production of HSSCC may require a high cement content, which increases the cost and limits production. This research focuses on producing HSSCC using glass powder (GP) to reduce the cement content and absorb glass waste. In this research, the experimental study was conducted on the degree of eleven experimental mixtures for SCC samples. Two types of glass waste powder (bottle glass powder and window glass powder) were added as a partial substitute for cement in proportions 10-50% by weight of cement. To evaluate the performance of GP, tests on workability, compressive strength, and transport characteristics (Chloride Permeability, Sorptivity Coefficient, and Water Permeability) were performed. The results showed that adding GP to concrete improved its fresh properties, which met the requirements of EFNARC specifications. The results also showed that adding GP decreased compressive strength with an increase in replacement rates. On the other hand, the transport properties improved, and the water and chloride permeability decreased with GP compared to the reference mixture. Keywords: High-strength self-compacting concrete, bottle glass powder, window glass powder, fresh properties, compressive strength, transport properties
Case Studies in Construction Materials, Dec 1, 2022
The global expansion of agricultural production has increased the amount of agricultural waste (A... more The global expansion of agricultural production has increased the amount of agricultural waste (AW). Accordingly, AW should be disposed of properly to preserve the environment. This study focuses on using rice straw ash (RSA) and palm leaf ash (PLA) as partial replacement for cement in the production of ultrahigh-performance concrete (UHPC). In particular, this research investigates the effect of using RSA and PLA as pozzolanic materials on the microstructure and the fresh, mechanical and physical properties of UHPC. Eleven UHPC mixtures are prepared as control mixtures without RSA and PLA. Five mixtures are used with 10%, 20%, 30%, 40% and 50% RSA, whilst five residual mixtures contain 10%, 20%, 30%, 40% and 50% PLA. Results indicate the efficiency of RSA or PLA as a partial substitute (i.e. 20% of cement weight), with mechanical properties and durability better than those of the reference mixture. The microstructure analysis shows that 20% RSA or PLA yields denser concrete than the control mixture. The UHPC samples with 20% RSA and 20% PLA achieve the best results of 188.5 MPa and 185 MPa by increasing compressive strength by about 13.2% and 11.1%, respectively, compared with the control mixture at a test age of 28 days. Important mechanical properties, such as splitting tensile strength, flexural strength and modulus of elasticity, exhibit a trend similar to that of the compressive strength results for all the UHPC mixtures. The average values of splitting tensile strength and flexural strength at 28 days are about 11% and 14% of the compressive strength of the same UHPC mixtures, respectively. The significance of the current study is the relatively high cement replacement percentages of up to 50% by weight and the use of AW as replacement materials.
A sizeable amount of tire rubber waste is generated due to the increasing number of road automobi... more A sizeable amount of tire rubber waste is generated due to the increasing number of road automobile users all over the world. The accumulation of this waste in the open area poses environmental threats and therefore requires suitable treatments. The use of waste obtained from tire rubber as a construction material could contribute to a circular economy, while at the same time be an eco-friendly method of minimizing the depletion of raw materials used for the development of building materials. This study aims to show the impact of crumb rubber (CR) on the properties of concrete. This review covers the environmental consideration of fresh and hardened properties of composites developed using waste tires. The results show that the plastic nature of CR with suitable admixture led to increasing slump value and consequently enhanced the CR concrete workability.
Journal of materials research and technology, Mar 1, 2020
Please cite this article in press as: Alyaa A, et al. Investigating the behaviour of hybrid fibre... more Please cite this article in press as: Alyaa A, et al. Investigating the behaviour of hybrid fibre-reinforced reactive powder concrete beams after exposure to elevated temperatures.
The effect of partial replacement of sand by plastic waste on the mechanical properties of concre... more The effect of partial replacement of sand by plastic waste on the mechanical properties of concrete under impact load was investigated experimentally and numerically. Specimens were prepared with 0%, 5%, 10% and 20% plastic waste as sand replacements. For each case, three beams of 100 mm wide, 50 mm deep and 400 mm long were loaded to failure in a drop-weight impact machine by subjecting it to 30 N weight from 400 mm height after 90 days, while another three beams of the same size and age were tested under static load. The load-displacement and fracture energy of the plain and concrete with plastic beams subjected to static and impact loads were studied. The dynamic beam behavior was also analyzed numerically using the finite-element method (FEM) based LUSAS software. In general, the experimental results reveal that the impact tup increase by 39% with 20% sand replacement by plastic waste, while the static peak bending load always decreases. The concrete with plastic waste is stronger and more energy-absorbing under impact loading, than under static loading. The predicted load against displacement behaviors of both plain concrete and concrete with plastic waste, are well matched with the experimental results.
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