The Experts below are selected from a list of 9111 Experts worldwide ranked by ideXlab platform
Vahid Afroughsabet - One of the best experts on this subject based on the ideXlab platform.
-
combined effect of silica fume and steel fibers on the impact resistance and mechanical properties of concrete
International Journal of Impact Engineering, 2010Co-Authors: Mahmoud Nili, Vahid AfroughsabetAbstract:Abstract This study investigated the impact resistance and mechanical properties of steel fiber-reinforced concrete with water–Cement ratios of 0.46 and 0.36, with and without the addition of silica fume. Hooked steel fibers with 60-mm length and an aspect ratio of 80, with three volume fractions of 0%, 0.5%, and 1% were used as the reinforcing Material. In pre-determined mixtures, silica fume is used as a Cement replaCement Material at 8% weight of Cement. The experimental results show that incorporation steel fibers improve the strength performance of concrete, particularly the splitting tensile and the flexural strengths. A remarkable improvement was observed in impact resistance of the fibrous concretes, as compared with the reference Materials. The results demonstrate that when steel fiber is introduced into the specimens including silica fume, the impact resistance and the ductility of the resulting concrete are considerably increased.
-
the effects of silica fume and polypropylene fibers on the impact resistance and mechanical properties of concrete
Construction and Building Materials, 2010Co-Authors: Mahmoud Nili, Vahid AfroughsabetAbstract:Abstract Impact resistance and strength performance of concrete mixtures with 0.36 and 0.46 water–Cement ratios made with polypropylene and silica fume are examined. Polypropylene fiber with 12-mm length and four volume fractions of 0%, 0.2%, 0.3% and 0.5% are used. In pre-determined mixtures, silica fume is used as Cement replaCement Material at 8% weight of Cement. The results show that incorporating polypropylene fibers improves mechanical properties. The addition of silica fume facilitates the dispersion of fibers and improves the strength properties, particularly the impact resistance of concretes. It is shown that using 0.5% polypropylene fiber in the silica fume mixture increases compressive split tensile, and flexural strength, and especially the performance of concrete under impact loading.
Mahmoud Nili - One of the best experts on this subject based on the ideXlab platform.
-
combined effect of silica fume and steel fibers on the impact resistance and mechanical properties of concrete
International Journal of Impact Engineering, 2010Co-Authors: Mahmoud Nili, Vahid AfroughsabetAbstract:Abstract This study investigated the impact resistance and mechanical properties of steel fiber-reinforced concrete with water–Cement ratios of 0.46 and 0.36, with and without the addition of silica fume. Hooked steel fibers with 60-mm length and an aspect ratio of 80, with three volume fractions of 0%, 0.5%, and 1% were used as the reinforcing Material. In pre-determined mixtures, silica fume is used as a Cement replaCement Material at 8% weight of Cement. The experimental results show that incorporation steel fibers improve the strength performance of concrete, particularly the splitting tensile and the flexural strengths. A remarkable improvement was observed in impact resistance of the fibrous concretes, as compared with the reference Materials. The results demonstrate that when steel fiber is introduced into the specimens including silica fume, the impact resistance and the ductility of the resulting concrete are considerably increased.
-
the effects of silica fume and polypropylene fibers on the impact resistance and mechanical properties of concrete
Construction and Building Materials, 2010Co-Authors: Mahmoud Nili, Vahid AfroughsabetAbstract:Abstract Impact resistance and strength performance of concrete mixtures with 0.36 and 0.46 water–Cement ratios made with polypropylene and silica fume are examined. Polypropylene fiber with 12-mm length and four volume fractions of 0%, 0.2%, 0.3% and 0.5% are used. In pre-determined mixtures, silica fume is used as Cement replaCement Material at 8% weight of Cement. The results show that incorporating polypropylene fibers improves mechanical properties. The addition of silica fume facilitates the dispersion of fibers and improves the strength properties, particularly the impact resistance of concretes. It is shown that using 0.5% polypropylene fiber in the silica fume mixture increases compressive split tensile, and flexural strength, and especially the performance of concrete under impact loading.
Mahyuddin Ramli - One of the best experts on this subject based on the ideXlab platform.
-
the implementation of wood waste ash as a partial Cement replaCement Material in the production of structural grade concrete and mortar an overview
Resources Conservation and Recycling, 2011Co-Authors: Chee Ban Cheah, Mahyuddin RamliAbstract:The timber manufacturing and power generation industry is gradually shifting towards the use of biomass such as timber processing waste for fuel and energy production and to help supplement the electrical energy demand of national electric gridlines. Though timber processing waste is a sustainable and renewable source of fuel for energy production, the thermal process of converting the aforementioned biomass into heat energy produces significant amounts of fine wood waste ash as a by-product Material which, if not managed properly, may result in serious environmental and health problems. Several current researches had been carried out to incorporate wood waste ash as a Cement replaCement Material in the production of greener concrete Material and also as a sustainable means of disposal for wood waste ash. Results of the researches have indicated that wood waste ash can be effectively used as a Cement replaCement Material for the production of structural grade concrete of acceptable strength and durability performances. This paper presents an overview of the work carried out by the use of wood waste ash as a partial replaCement of Cement in mortar and concrete mixes. Several aspects such as the physical and chemical properties of wood waste ash, properties of wood waste ash/OPC blended Cement pastes, rheological, mechanical and the durability properties of wood waste ash/OPC concrete mix are detailed in this paper.
Prasada Rao Rangaraju - One of the best experts on this subject based on the ideXlab platform.
-
Impact of combined use of ground glass powder and crushed glass aggregate on selected properties of Portland Cement concrete
Construction and Building Materials, 2016Co-Authors: Kaveh Afshinnia, Prasada Rao RangarajuAbstract:Abstract In this study, the impact of using ground glass powder as either a Cement replaCement Material or as an aggregate replaCement Material on the fresh and mechanical properties of Portland Cement concrete were investigated. Also, the synergistic influence of using combinations of glass powder with crushed glass aggregate or natural mineral aggregate on the properties of concrete were investigated. The properties of concrete evaluated in this study include slump (workability), density, air content, compressive and splitting tensile strengths of concrete. Results from this investigation showed that the workability of concrete was significantly affected depending on whether the glass powder was used as Cement or aggregate replaCement Material, however, air content and density of concrete were affected only when glass powder was used as Cement replaCement Material. In terms of mechanical properties, in the absence of glass powder in concrete, the compressive and splitting tensile strength values of the concrete specimens containing crushed glass aggregate were significantly lower than that of the concrete containing natural mineral aggregate. When glass powder was used as a Cement replaCement Material in concrete, the compressive strength of concrete decreased regardless of the aggregate type. However, when glass powder was used as an aggregate replaCement Material, the compressive strength of concrete depended on the type containing crushed glass aggregate increased while the compressive strength of concrete containing natural mineral aggregate decreased.
-
Mitigating Alkali–Silica Reaction in Concrete: Effectiveness of Ground Glass Powder from Recycled Glass
Transportation Research Record, 2015Co-Authors: Kaveh Afshinnia, Prasada Rao RangarajuAbstract:This study investigated the effectiveness of using recycled waste glass in portland Cement concrete, both as a finely ground powder and as a crushed granular Material. For the potential of glass to undergo alkali–silica reactivity (ASR) distress to be assessed, mortar bar and miniature concrete prism tests were conducted with glass as both a powder and a crushed Material. Parallel studies were conducted with a crushed natural aggregate. Simultaneously, strength activity index and thermogravimetric analysis tests were conducted on Cementitious mixtures to evaluate pozzolanic reactivity of glass powder when used as Cement replaCement Material. Results showed that when glass powder (70 μm average size) was used as Cement replaCement Material, its pozzolanic behavior (measured by thermogravimetric analysis and strength activity index) was minimal. When glass powder was used as aggregate replaCement Material, the combination of glass powder and ASR-prone coarse aggregates showed significantly lower expansion t...
-
influence of fineness of ground recycled glass on mitigation of alkali silica reaction in mortars
Construction and Building Materials, 2015Co-Authors: Kaveh Afshinnia, Prasada Rao RangarajuAbstract:Abstract The use of waste glass, both as a crushed glass aggregate and in a finely ground form, as a pozzolanic Material in concrete has been extensively studied in the past. However, the combined use of finely ground glass powders with crushed glass aggregates has not been previously explored, as this presents a unique opportunity to not only maximize the use of waste glass in concrete but also potentially address the alkali–silica reaction issues, often associated with the use of crushed glass aggregates in concrete. This study focused on studying the influence of fineness of glass powder in mitigating alkali–silica reaction in mortar specimens containing crushed glass aggregate and a natural reactive aggregate. In these studies the glass powders were used both as a Cement replaCement Material and as an aggregate replaCement Material. Two different fineness of glass powder were evaluated in this study, with an average particle size of 17 and 70 microns. Mortar bars prepared with glass powder as aggregate replaCement Material at 10%, 20% and 30% replaCement levels were evaluated in the standard ASTM C1260 test method. Mortar bars prepared with glass powder as Cement replaCement Material at 10% and 20% were evaluated in the standard ASTM C1567 test method. The results from these studies showed that the finer glass powder showed significantly improved ability to mitigate ASR, particularly when used as an aggregate replaCement Material, both in the case of crushed glass and natural reactive aggregates. This study shows that an aggregate comprised of 100% glass Material can be produced without any deleterious consequences of alkali–silica reaction, provided sufficient quantity of fine glass powder is used in the mixture.
Chee Ban Cheah - One of the best experts on this subject based on the ideXlab platform.
-
the implementation of wood waste ash as a partial Cement replaCement Material in the production of structural grade concrete and mortar an overview
Resources Conservation and Recycling, 2011Co-Authors: Chee Ban Cheah, Mahyuddin RamliAbstract:The timber manufacturing and power generation industry is gradually shifting towards the use of biomass such as timber processing waste for fuel and energy production and to help supplement the electrical energy demand of national electric gridlines. Though timber processing waste is a sustainable and renewable source of fuel for energy production, the thermal process of converting the aforementioned biomass into heat energy produces significant amounts of fine wood waste ash as a by-product Material which, if not managed properly, may result in serious environmental and health problems. Several current researches had been carried out to incorporate wood waste ash as a Cement replaCement Material in the production of greener concrete Material and also as a sustainable means of disposal for wood waste ash. Results of the researches have indicated that wood waste ash can be effectively used as a Cement replaCement Material for the production of structural grade concrete of acceptable strength and durability performances. This paper presents an overview of the work carried out by the use of wood waste ash as a partial replaCement of Cement in mortar and concrete mixes. Several aspects such as the physical and chemical properties of wood waste ash, properties of wood waste ash/OPC blended Cement pastes, rheological, mechanical and the durability properties of wood waste ash/OPC concrete mix are detailed in this paper.