The Experts below are selected from a list of 8604 Experts worldwide ranked by ideXlab platform
Esraa M Auda - One of the best experts on this subject based on the ideXlab platform.
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re use of waste marble dust in the production of cement and concrete
Construction and Building Materials, 2014Co-Authors: Ali A Aliabdo, Abd Elmoaty Abd M Elmoaty, Esraa M AudaAbstract:Abstract The main objective of this research is to investigate the possibility of utilizing waste marble dust (MD) in cement and concrete production. The research work was divided into two sections. The first section deals with the properties of cement modified with marble dust (marble dust blended cement), whereas the second section discusses the properties of concrete contained marble dust as a cement Replacement and as a Sand Replacement (cement addition). The Replacement ratios which have been studied were 0.0%, 5.0%, 7.5%, 10.0% and 15% by weight. Water to powder ratio (w/p) or water to cement ratio (w/c) were 0.50 and 0.40 in case of cement Replacement and in case of Sand Replacement respectively. Physical, mechanical and chemical properties of cement and concrete modified with marble dust were investigated. In addition, TGA, XRD and SEM analysis were performed. Test results of cement paste and cement mortar indicate that the marble dust blended cement remains within the acceptable ranges of the Egyptian standards. Also, generally, the use of marble dust in concrete production as cement Replacement or as Sand Replacement (cement addition) gradually enhances both of the mechanical and physical properties of concrete especially with lower w/c ratio. Marble dust showed a filler effect in concrete and had no noticeable role in the hydration process. Yet, concrete made with marble dust as Sand Replacement achieved better performance compared to concrete made with marble dust as cement Replacement.
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re use of waste marble dust in the production of cement and concrete
Construction and Building Materials, 2014Co-Authors: Ali A Aliabdo, Abd Elmoaty Abd M Elmoaty, Esraa M AudaAbstract:Abstract The main objective of this research is to investigate the possibility of utilizing waste marble dust (MD) in cement and concrete production. The research work was divided into two sections. The first section deals with the properties of cement modified with marble dust (marble dust blended cement), whereas the second section discusses the properties of concrete contained marble dust as a cement Replacement and as a Sand Replacement (cement addition). The Replacement ratios which have been studied were 0.0%, 5.0%, 7.5%, 10.0% and 15% by weight. Water to powder ratio (w/p) or water to cement ratio (w/c) were 0.50 and 0.40 in case of cement Replacement and in case of Sand Replacement respectively. Physical, mechanical and chemical properties of cement and concrete modified with marble dust were investigated. In addition, TGA, XRD and SEM analysis were performed. Test results of cement paste and cement mortar indicate that the marble dust blended cement remains within the acceptable ranges of the Egyptian standards. Also, generally, the use of marble dust in concrete production as cement Replacement or as Sand Replacement (cement addition) gradually enhances both of the mechanical and physical properties of concrete especially with lower w/c ratio. Marble dust showed a filler effect in concrete and had no noticeable role in the hydration process. Yet, concrete made with marble dust as Sand Replacement achieved better performance compared to concrete made with marble dust as cement Replacement.
Ali A Aliabdo - One of the best experts on this subject based on the ideXlab platform.
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re use of waste marble dust in the production of cement and concrete
Construction and Building Materials, 2014Co-Authors: Ali A Aliabdo, Abd Elmoaty Abd M Elmoaty, Esraa M AudaAbstract:Abstract The main objective of this research is to investigate the possibility of utilizing waste marble dust (MD) in cement and concrete production. The research work was divided into two sections. The first section deals with the properties of cement modified with marble dust (marble dust blended cement), whereas the second section discusses the properties of concrete contained marble dust as a cement Replacement and as a Sand Replacement (cement addition). The Replacement ratios which have been studied were 0.0%, 5.0%, 7.5%, 10.0% and 15% by weight. Water to powder ratio (w/p) or water to cement ratio (w/c) were 0.50 and 0.40 in case of cement Replacement and in case of Sand Replacement respectively. Physical, mechanical and chemical properties of cement and concrete modified with marble dust were investigated. In addition, TGA, XRD and SEM analysis were performed. Test results of cement paste and cement mortar indicate that the marble dust blended cement remains within the acceptable ranges of the Egyptian standards. Also, generally, the use of marble dust in concrete production as cement Replacement or as Sand Replacement (cement addition) gradually enhances both of the mechanical and physical properties of concrete especially with lower w/c ratio. Marble dust showed a filler effect in concrete and had no noticeable role in the hydration process. Yet, concrete made with marble dust as Sand Replacement achieved better performance compared to concrete made with marble dust as cement Replacement.
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re use of waste marble dust in the production of cement and concrete
Construction and Building Materials, 2014Co-Authors: Ali A Aliabdo, Abd Elmoaty Abd M Elmoaty, Esraa M AudaAbstract:Abstract The main objective of this research is to investigate the possibility of utilizing waste marble dust (MD) in cement and concrete production. The research work was divided into two sections. The first section deals with the properties of cement modified with marble dust (marble dust blended cement), whereas the second section discusses the properties of concrete contained marble dust as a cement Replacement and as a Sand Replacement (cement addition). The Replacement ratios which have been studied were 0.0%, 5.0%, 7.5%, 10.0% and 15% by weight. Water to powder ratio (w/p) or water to cement ratio (w/c) were 0.50 and 0.40 in case of cement Replacement and in case of Sand Replacement respectively. Physical, mechanical and chemical properties of cement and concrete modified with marble dust were investigated. In addition, TGA, XRD and SEM analysis were performed. Test results of cement paste and cement mortar indicate that the marble dust blended cement remains within the acceptable ranges of the Egyptian standards. Also, generally, the use of marble dust in concrete production as cement Replacement or as Sand Replacement (cement addition) gradually enhances both of the mechanical and physical properties of concrete especially with lower w/c ratio. Marble dust showed a filler effect in concrete and had no noticeable role in the hydration process. Yet, concrete made with marble dust as Sand Replacement achieved better performance compared to concrete made with marble dust as cement Replacement.
Katja Sonja Nitzsche - One of the best experts on this subject based on the ideXlab platform.
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Arsenic removal from drinking water by a household Sand filter in Vietnam - Effect of filter usage practices on arsenic removal efficiency and microbiological water quality
Science of the Total Environment, 2015Co-Authors: Katja Sonja Nitzsche, Vi Mai Lan, Jan Zahoransky, Stefanie Katharina Müller, Pham Thi Kim Trang, Michael Berg, Pham Hung Viet, Britta Planer-friedrich, Andreas Voegelin, James Martin ByrneAbstract:Household Sand filters are applied to treat arsenic- and iron-containing anoxic groundwater that is used as drinking water in rural areas of North Vietnam. These filters immobilize poisonous arsenic (As) via co-oxidation with Fe(II) and sorption to or co-precipitation with the formed Fe(III) (oxyhydr)oxides. However, information is lacking regarding the effect of the frequency and duration of filter use as well as of filter Sand Replacement on the residual As concentrations in the filtered water and on the presence of potentially pathogenic bacteria in the filtered and stored water. We therefore scrutinized a household Sand filter with respect to As removal efficiency and the presence of fecal indicator bacteria in treated water as a function of filter operation before and after Sand Replacement. Quantification of As in the filtered water showed that periods of intense daily use followed by periods of non-use and even Sand Replacement did not significantly (p
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arsenic removal from drinking water by a household Sand filter in vietnam effect of filter usage practices on arsenic removal efficiency and microbiological water quality
Science of The Total Environment, 2015Co-Authors: Katja Sonja Nitzsche, Jan Zahoransky, Pham Thi Kim Trang, Pham Hung Vie, Michael Erg, Andreas Voegeli, Itta Planerfriedrich, Stefanie Katharina Mulle, James M Yrne, Christia SchrodeAbstract:Abstract Household Sand filters are applied to treat arsenic- and iron-containing anoxic groundwater that is used as drinking water in rural areas of North Vietnam. These filters immobilize poisonous arsenic (As) via co-oxidation with Fe(II) and sorption to or co-precipitation with the formed Fe(III) (oxyhydr)oxides. However, information is lacking regarding the effect of the frequency and duration of filter use as well as of filter Sand Replacement on the residual As concentrations in the filtered water and on the presence of potentially pathogenic bacteria in the filtered and stored water. We therefore scrutinized a household Sand filter with respect to As removal efficiency and the presence of fecal indicator bacteria in treated water as a function of filter operation before and after Sand Replacement. Quantification of As in the filtered water showed that periods of intense daily use followed by periods of non-use and even Sand Replacement did not significantly ( p − 1 in the groundwater to 5.3 ± 0.7 μg L − 1 in the filtered water (95% removal). The first flush of water from the filter contained As concentrations below the drinking water limit and suggests that this water can be used without risk for human health. Colony forming units (CFUs) of coliform bacteria increased during filtration and storage from 5 ± 4 per 100 mL in the groundwater to 5.1 ± 1.5 × 10 3 and 15 ± 1.4 × 10 3 per 100 mL in the filtered water and in the water from the storage tank, respectively. After filter Sand Replacement, CFUs of Escherichia coli of Enterococcus spp. No critical enrichment of fecal indicator bacteria belonging to E. coli or Enterococcus spp. was observed in the treated drinking water by qPCR targeting the 23S rRNA gene. The results demonstrate the efficient and reliable performance of household Sand filters regarding As removal, but indicate a potential risk for human health arising from the enrichment of coliform bacteria during filtration and from E. coli cells that are introduced by Sand Replacement.
Abd Elmoaty Abd M Elmoaty - One of the best experts on this subject based on the ideXlab platform.
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re use of waste marble dust in the production of cement and concrete
Construction and Building Materials, 2014Co-Authors: Ali A Aliabdo, Abd Elmoaty Abd M Elmoaty, Esraa M AudaAbstract:Abstract The main objective of this research is to investigate the possibility of utilizing waste marble dust (MD) in cement and concrete production. The research work was divided into two sections. The first section deals with the properties of cement modified with marble dust (marble dust blended cement), whereas the second section discusses the properties of concrete contained marble dust as a cement Replacement and as a Sand Replacement (cement addition). The Replacement ratios which have been studied were 0.0%, 5.0%, 7.5%, 10.0% and 15% by weight. Water to powder ratio (w/p) or water to cement ratio (w/c) were 0.50 and 0.40 in case of cement Replacement and in case of Sand Replacement respectively. Physical, mechanical and chemical properties of cement and concrete modified with marble dust were investigated. In addition, TGA, XRD and SEM analysis were performed. Test results of cement paste and cement mortar indicate that the marble dust blended cement remains within the acceptable ranges of the Egyptian standards. Also, generally, the use of marble dust in concrete production as cement Replacement or as Sand Replacement (cement addition) gradually enhances both of the mechanical and physical properties of concrete especially with lower w/c ratio. Marble dust showed a filler effect in concrete and had no noticeable role in the hydration process. Yet, concrete made with marble dust as Sand Replacement achieved better performance compared to concrete made with marble dust as cement Replacement.
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re use of waste marble dust in the production of cement and concrete
Construction and Building Materials, 2014Co-Authors: Ali A Aliabdo, Abd Elmoaty Abd M Elmoaty, Esraa M AudaAbstract:Abstract The main objective of this research is to investigate the possibility of utilizing waste marble dust (MD) in cement and concrete production. The research work was divided into two sections. The first section deals with the properties of cement modified with marble dust (marble dust blended cement), whereas the second section discusses the properties of concrete contained marble dust as a cement Replacement and as a Sand Replacement (cement addition). The Replacement ratios which have been studied were 0.0%, 5.0%, 7.5%, 10.0% and 15% by weight. Water to powder ratio (w/p) or water to cement ratio (w/c) were 0.50 and 0.40 in case of cement Replacement and in case of Sand Replacement respectively. Physical, mechanical and chemical properties of cement and concrete modified with marble dust were investigated. In addition, TGA, XRD and SEM analysis were performed. Test results of cement paste and cement mortar indicate that the marble dust blended cement remains within the acceptable ranges of the Egyptian standards. Also, generally, the use of marble dust in concrete production as cement Replacement or as Sand Replacement (cement addition) gradually enhances both of the mechanical and physical properties of concrete especially with lower w/c ratio. Marble dust showed a filler effect in concrete and had no noticeable role in the hydration process. Yet, concrete made with marble dust as Sand Replacement achieved better performance compared to concrete made with marble dust as cement Replacement.
Khairunisa Muthusamy - One of the best experts on this subject based on the ideXlab platform.
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Compressive strength of palm oil clinker lightweight aggregate concrete containing coal bottom ash as Sand Replacement
Materials Today: Proceedings, 2020Co-Authors: Khairunisa Muthusamy, Nur Farah Aziera Jamaludin, Mohamad Nurfahmi Kamaruzzaman, Muhammad Zulhusni Ahmad, Nur Azzimah Zamri, Ahmed Mokhtar Albshir BudieaAbstract:Abstract This research investigates the effect of coal bottom ash (CBA) content as partial Sand Replacement on workability and compressive strength of palm oil clinker lightweight concrete. Five types of mixes consisting 0%, 10%, 20%, 30% and 40% CBA as Sand Replacement were used. Specimens were water cured until the testing age. Compressive strength and water absorption test were conducted at 28 days. Inclusion of 10% CBA produces concrete with the targeted strength. However, excessive use of CBA at 40% should be avoided as it results in significant strength reduction.
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Effect of Unground Palm Oil Fuel Ash as Partial Sand Replacement on Compressive Strength of Oil Palm Shell Lightweight Concrete
IOP Conference Series: Materials Science and Engineering, 2020Co-Authors: S. Wan Ahmad, Khairunisa Muthusamy, Ahmed Mokhtar Albshir Budiea, Mohd Hisbany Mohd Hashim, Nur Farhayu AriffinAbstract:Concern towards degradation of environment due to increasing use of natural Sand in construction industry and dumping of solid wastes from palm oil industry namely palm oil fuel ash and oil palm shell has lead towards the development of environmental friendly concrete. The present study investigates the effect of unground palm oil fuel ash as partial Sand Replacement towards workability and compressive strength of oil palm shell lightweight aggregate concrete. Two types of mixes were used. Control specimen was prepared using 100% natural Sand. Another type of mix were prepared by integrating 5%, 10% and 15% unground palm oil fuel ash by weight of Sand. The concrete mixes workability were investigated by conducting slump test in accordance to standard. All specimens were made in form of cubes (150mm x150mm) and water cured up to 28 days. The compressive strength test was carried out in accordance to BS EN12390: 3 at 1, 4, 7 and 28 days. The finding shows that integration of 10% unground palm oil fuel ash contributes to the enhancement of oil palm shell lightweight aggregate concrete properties. Success in using unground POFA as partial Sand Replacement in concrete production would reduce quantity of ash disposed as waste and save the consumption of natural river Sand.
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Properties of palm oil fuel ash cement Sand brick containing pulverized cockle shell as partial Sand Replacement
IOP Conference Series: Earth and Environmental Science, 2018Co-Authors: S. Mat Aris, Khairunisa Muthusamy, A. Uzer, S. Wan AhmadAbstract:Environmental pollution caused by the disposal of solid wastes generated from both palm oil industry and cockle shell trade has motivated researches to explore the potential of these wastes. Integrating these wastes in production of construction material is one of the way to reduce amount of waste thrown at dumping area. Thus, the present investigation investigates the performance of palm oil fuel ash (POFA) cement Sand brick containing pulverized cockle shell as partial fine aggregate Replacement. All mixes used contains 20% of POFA as partial cement Replacement. Total of six mixes were prepared by adding a range of pulverized cockle shell that is 0%, 10%, 20%, 30%, 40% and 50% as partial Sand Replacement. The mixes were prepared in form of brick. All the water cured samples were tested for compressive strength and flexural strength until 28 days. Findings show that brick produced using 20% pulverized cockle shell exhibit the highest compressive strength and flexural strength also the lowest water absorption value.
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effect of fly ash content towards sulphate resistance of oil palm shell lightweight aggregate concrete
Microelectronics Systems Education, 2018Co-Authors: Khairunisa Muthusamy, A Muhammad Nazrin Z Akmal, Wan S Ahmad, Nur Z Azzimah, Mat Yahaya Fadzil, Mohd Hafidzal Mohd Hanafi, Mohamad R HafizuddinAbstract:Both oil palm shell (OPS) and fly ash are by-product generated from the industries. Disposal of these by-product as wastes cause negative impact to the environment. The use of both oil palm shell and fly ash in concrete is seen as an economical solution for making green and denser concrete. The primary aim of this research is to determine the effects of FA utilization as Sand Replacement in oil palm shell lightweight aggregate concrete (OPS LWAC) towards sulphate resistance. Five concrete mixes containing fly ash as Sand Replacement namely 0%, 10%, 20%, 30% and 40% were prepared in these experimental work. All mixes were cast in form of cubes before subjected to sulphate solution for the period of 5 months. It was found that addition of 10% fly ash as Sand Replacement content resulted in better sulphate resistance of OPS LWAC. The occurrence of pozzolanic reaction due to the presence of FA in concrete has consumed the vulnerable Calcium hydroxide to be secondary C-S-H gel making the concrete denser and more durable.
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Utilization of fly ash as partial Sand Replacement in oil palm shell lightweight aggregate concrete
IOP Conference Series: Materials Science and Engineering, 2017Co-Authors: A Muhammad Nazrin Z Akmal, Khairunisa Muthusamy, F Mat Yahaya, H. Mohd Hanafi, Z. Nur AzzimahAbstract:Realization on the increasing demand for river Sand supply in construction sector has inspired the current research to find alternative material to reduce the use of natural Sand in oil palm shell lightweight aggregate concrete (OPS LWAC) production. The existence of fly ash, a by-product generated from coal power plant, which pose negative impact to the environment when it is disposed as waste, were used in this research. The effect of fly ash content as partial Sand Replacement towards workability and compressive strength of OPS lightweight aggregate concrete were investigated. Four concrete mixes containing various percentage of fly ash that are 0%, 10%, 20% and 30% by weight of Sand were used in the experimental work. All mixes were cast in form of cubes before subjected to water curing until the testing age. Compressive strength test were conducted at 1, 3, 7 and 28 days. The finding shows that the workability of the OPS LWAC decreases when more fly ash are used as Sand Replacement. It was found that adding of 10% fly ash as Sand Replacement content resulted in better compressive strength of OPS LWAC, which is higher than the control mix.
