The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Hossein Mohammadhosseini - One of the best experts on this subject based on the ideXlab platform.
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strength and transport Properties of Concrete composites incorporating waste carpet fibres and palm oil fuel ash
Journal of building engineering, 2018Co-Authors: Hossein Mohammadhosseini, Mahmood Md Tahir, M I SayyedAbstract:Abstract The use of industrial wastes in the production of green and sustainable Concrete has attracted much attention in recent years because of the low-cost of waste materials along with saving a significant place for landfill purposes and also enhance the performance of Concrete. In this study, the strength and transport Properties of Concretes comprising waste carpet fibre and palm oil fuel ash (PofA) were investigated. The VeBe time and slump tests on fresh Concrete in addition to compressive strength, tensile strength, flexural strength, sorptivity, and chloride penetration of hardened Concrete were tested. The combined effect of carpet fibres and PofA was investigated using microstructural analysis in terms of scanning electron microscopy (SEM) and X-Ray Diffraction (XRD). Six Concrete mixes containing 0–1.25% fibres with a length of 20 mm were cast for ordinary Portland cement (OPC). Further, six Concrete batches with the same fibre content were made, where 20% PofA substituted OPC. The incorporation of waste carpet fibres and PofA decreased the workability of Concrete. The inclusion of carpet fibres to both OPC and PofA mixtures reduced the compressive strength values. The positive interaction amongst carpet fibre and PofA lead to greater splitting tensile and flexural strengths. Also, sorptivity and chloride penetration of the OPC and PofA-based mixtures were significantly decreased by the inclusion of carpet fibre up to 0.75%. The influence of PofA on the transport Properties of Concrete composites was noticed to be more considerable along with the curing periods.
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effects of elevated temperatures on residual Properties of Concrete reinforced with waste polypropylene carpet fibres
Arabian Journal for Science and Engineering, 2018Co-Authors: Hossein Mohammadhosseini, Nor Hasanah Abdul Shukor Lim, Abdul Rahman Mohd Sam, Mostafa SamadiAbstract:In this study, the effect of waste polypropylene carpet fibres and palm oil fuel ash (PofA) on the mechanical and microstructural Properties of Concrete exposed to elevated temperatures was investigated. Concrete samples were exposed to high temperatures up to \(800\,{^{\circ}}\hbox {C}\) then cooled to ambient temperature before tests. Four mixes containing carpet fibres (0 and 0.5%) and PofA (0 and 20%) were prepared. Mass loss, residual ultrasonic pulse velocity, compressive strength, scanning electron microscopy, X-ray diffraction and differential thermal analysis were performed to investigate the effects of carpet fibres and PofA on the performance of the Concrete at elevated temperatures. The results showed that both carpet fibres and PofA were associated with a significant enhancement in the fire resistance and residual compressive strength and also eliminating the explosive spalling behaviour of the Concrete at elevated temperatures. Furthermore, the role of carpet fibres and PofA is discussed through the microstructural analysis and fibre–matrix interactions as function of heat treatment.
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the impact resistance and mechanical Properties of Concrete reinforced with waste polypropylene carpet fibres
Construction and Building Materials, 2017Co-Authors: Hossein Mohammadhosseini, A Abdul S M Awal, Jamaludin Mohd YatimAbstract:The utilization of waste materials is one of the fundamental issues of waste management strategies in many parts of the world. With the advances in cement and Concrete technology, the use of waste materials in the Concrete industry has developed gradually widespread because of technological, economic and ecological advantages. This paper presents the potential use of waste polypropylene carpet fibres, and highlights the impact resistance and mechanical Properties of Concrete with the fibres. Six volume fractions varying from 0 to 1.25% of 20-mm-long carpet fibres were used with ordinary Portland cement (OPC) Concrete mixes. Another six mixes were made where OPC was replaced by 20% palm oil fuel ash (PofA) as supplementary cementing material. It has been found that the addition of polypropylene carpet fibre decreased the slump values and increased the VeBe time of fresh Concrete. The inclusion of carpet fibre to either OPC or PofA Concrete mixes did not improve the compressive strength at early ages. At later ages, however, the compressive strength of the mixtures containing PofA significantly increased and the obtained values were higher than that mixes with OPC alone. The positive interaction between carpet fibres and PofA leads to high tensile strength, flexural strengths and impact resistance, thereby increasing the Concrete ductility with higher energy absorption and improved crack distribution. It is concluded that waste carpet fibres and palm oil fuel ash can be used as building materials in the construction of sustainable Concrete.
Jamaludin Mohd Yatim - One of the best experts on this subject based on the ideXlab platform.
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the impact resistance and mechanical Properties of Concrete reinforced with waste polypropylene carpet fibres
Construction and Building Materials, 2017Co-Authors: Hossein Mohammadhosseini, A Abdul S M Awal, Jamaludin Mohd YatimAbstract:The utilization of waste materials is one of the fundamental issues of waste management strategies in many parts of the world. With the advances in cement and Concrete technology, the use of waste materials in the Concrete industry has developed gradually widespread because of technological, economic and ecological advantages. This paper presents the potential use of waste polypropylene carpet fibres, and highlights the impact resistance and mechanical Properties of Concrete with the fibres. Six volume fractions varying from 0 to 1.25% of 20-mm-long carpet fibres were used with ordinary Portland cement (OPC) Concrete mixes. Another six mixes were made where OPC was replaced by 20% palm oil fuel ash (PofA) as supplementary cementing material. It has been found that the addition of polypropylene carpet fibre decreased the slump values and increased the VeBe time of fresh Concrete. The inclusion of carpet fibre to either OPC or PofA Concrete mixes did not improve the compressive strength at early ages. At later ages, however, the compressive strength of the mixtures containing PofA significantly increased and the obtained values were higher than that mixes with OPC alone. The positive interaction between carpet fibres and PofA leads to high tensile strength, flexural strengths and impact resistance, thereby increasing the Concrete ductility with higher energy absorption and improved crack distribution. It is concluded that waste carpet fibres and palm oil fuel ash can be used as building materials in the construction of sustainable Concrete.
Bibhuti Bhusan Mukharjee - One of the best experts on this subject based on the ideXlab platform.
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Effect of incorporation of metakaolin and recycled coarse aggregate on Properties of Concrete
Journal of Cleaner Production, 2019Co-Authors: Rakesh Muduli, Bibhuti Bhusan MukharjeeAbstract:Abstract The present research work investigates the utilization of metakaolin as a mineral admixture in improving the Properties of Concrete mixes, containing varying percentages of recycled coarse aggregates (RCA). For this, fifteen Concrete mixes have been designed by substituting natural coarse aggregates (NCA) with 0%, 50% and 100% RCA and cement with 0%, 5%, 10%, 15% and 20% metakaolin. Nine different Properties of Concrete including workability, compressive strength at three different curing ages (3, 7 and 28 days), splitting tensile strength, flexural strength, ultrasonic pulse velocity, rebound number, water absorption, density and volume of voids have been experimented to examine the effect of metakaolin and RCA on the Properties of Concrete. The outcomes of the study reveal that the workability becomes higher with higher percentage of RCA; however it slightly reduces when metakaolin is used. The mechanical Properties like compressive strength, splitting tensile strength, flexural strength and dry density get reduced when quantities of RCA increases. The non-destructive parameters like ultrasonic pulse velocity and rebound number of Concrete follows similar pattern as that of compressive strength. The water absorption and volume of voids shows higher values for recycled aggregate Concrete (RAC) mixes. However, the use of metakaolin in RAC significantly reduces the water absorption and volume of voids. The optimum replacement percentage of metakaolin is found to be 15% as the RAC mixes shows best performance at this replacement level. Furthermore, the Properties of Concrete mix containing 100% RCA and 15% metakaolin are similar to that of normal Concrete. Therefore, it is feasible to produce sustainable Concrete by using maximum waste Concrete i.e. 100% RCA and 15% metakaolin without much affecting the strength criteria.
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influence of incorporation of granulated blast furnace slag as replacement of fine aggregate on Properties of Concrete
Journal of Cleaner Production, 2017Co-Authors: Rakesh Kumar Patra, Bibhuti Bhusan MukharjeeAbstract:Abstract Conservation of natural resources, efficient utilization of industrial waste and reduction of environmental pollution are major driving forces behind the use of waste products generated from different industries in making various cementitious products. Moreover, alternate sources of fine aggregates are to be explored to fulfill the acute shortage of natural aggregates in various parts of the world. Therefore, the present study tries to explore alternative sources of fine aggregate by investigating the effect of incorporation of granulated blast furnace slag (GBS) as replacement of natural fine aggregate on the Properties of Concrete mixes. For this, Concrete mixes are prepared with two water/cement ratios (0.45 and 0.5) and three different percentages of GBS (20%, 40%, and 60%). Various Properties of Concrete mixes such as workability, compressive strength after 7, 28 and 90 days, splitting tensile and flexural strength, and rebound number have been studied to ascertain the influence of incorporation of GBS in Concrete. The test results show an improvement in compressive and tensile strength of Concrete with the incorporation of GBS in Concrete mixes. The development in compressive strength at different curing time is similar to that of normal Concrete. Furthermore, the study depicts that rebound number of Concrete increases with increasing percentages of GBS, which indicates the improvement in the quality of Concrete with the incorporation of GBS in Concrete.
Rafat Siddique - One of the best experts on this subject based on the ideXlab platform.
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Effect of coal bottom ash as partial replacement of sand on Properties of Concrete
Resources Conservation and Recycling, 2013Co-Authors: Malkit Singh, Rafat SiddiqueAbstract:Abstract Coal bottom ash (CBA) is formed in coal furnaces. It is made from agglomerated ash particles that are too large to be carried in the flue gases and fall through open grates to an ash hopper at the bottom of the furnace. Bottom ash is mainly comprised of fused coarser ash particles. These particles are quite porous and look like volcanic lava. Bottom ash forms up to 25% of the total ash while the fly ash forms the remaining 75%. One of the most common uses for bottom ash is as structural fill. Published literature shown that there is a strongly possibility of coal bottom ash being used as substitute/replacement of fine aggregate (sand). Its use in Concrete becomes more significant and important in view of the fact that sources of natural sand as fine aggregates are getting depleted gradually, and it is of prime importance that substitute of sand be explored. This paper presents an overview of the published literature on the use of coal bottom ash in Concrete. Effect of coal bottom ash on the Properties of Concrete such as workability, bleeding, setting times, compressive strength, split tensile strength, flexural strength, shrinkage, and durability are presented.
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Properties of Concrete containing ground granulated blast furnace slag ggbfs at elevated temperatures
Journal of Advanced Research, 2012Co-Authors: Rafat Siddique, Deepinder KaurAbstract:Abstract Normal strength (NSC) and high-performance Concretes (HPC) are being used extensively in the construction of structures that might be subjected to elevated temperatures. The behaviour of Concrete structures at elevated temperatures is of significant importance in predicting the safety of structures in response to certain accidents or particular service conditions. This paper deals with the mechanical Properties of Concrete made with ground granulated blast furnace slag (GGBFS) subjected to temperatures up to 350 °C. For this purpose, normal Concrete having compressive strength of 34 MPa was designed using GGBFS as partial replacement of cement. Cylindrical specimens (150 × 300 mm) were made and subjected to temperatures of 100, 200 and 350 °C. Measurements were taken for mass loss, compressive strength, splitting tensile strength, and modulus of elasticity. This investigation developed some important data on the Properties of Concrete exposed to elevated temperatures up to 350 °C.
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effect of fine aggregate replacement with class f fly ash on the mechanical Properties of Concrete
Cement and Concrete Research, 2003Co-Authors: Rafat SiddiqueAbstract:This paper presents the results of an experimental investigation carried out to evaluate the mechanical Properties of Concrete mixtures in which fine aggregate (sand) was partially replaced with Class F fly ash. Fine aggregate (sand) was replaced with five percentages (10%, 20%, 30%, 40%, and 50%) of Class F fly ash by weight. Tests were performed for Properties of fresh Concrete. Compressive strength, splitting tensile strength, flexural strength, and modulus of elasticity were determined at 7, 14, 28, 56, 91, and 365 days. Test results indicate significant improvement in the strength Properties of plain Concrete by the inclusion of fly ash as partial replacement of fine aggregate (sand), and can be effectively used in structural Concrete. D 2002 Elsevier Science Ltd. All rights reserved.
D Pedro - One of the best experts on this subject based on the ideXlab platform.
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mechanical Properties of Concrete produced with recycled coarse aggregates influence of the use of superplasticizers
Construction and Building Materials, 2013Co-Authors: D Matias, J De Brito, A Rosa, D PedroAbstract:Abstract Waste management has become vitally important since the demand for natural resources and the amount of construction and demolition waste have greatly increased, putting huge pressure on the environment. The main goal of this study is to evaluate the effects of the introduction of superplasticizers on some mechanical Properties of Concrete with recycled Concrete aggregates and compare them with the corresponding Properties of conventional Concrete made with natural aggregates. The experimental program is described and the results of workability, specific density, compressive strength, splitting tensile strength and abrasion resistance tests carried out on Concrete are presented. Two different crushing processes and their effects on aggregate Properties were tested. By varying the replacement percentage of natural by recycled aggregates, with or without the addition of superplasticizers, it was possible to identify some weaknesses and strengths of the recycled aggregates Concrete which can contribute to developing the more widespread use of this material.
