The Experts below are selected from a list of 2706 Experts worldwide ranked by ideXlab platform
Malik Cheriaf - One of the best experts on this subject based on the ideXlab platform.
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influence of coal bottom ash as fine aggregate on fresh properties of concrete
Construction and Building Materials, 2009Co-Authors: L.b. Andrade, Janaíde Cavalcante Rocha, Malik CheriafAbstract:Abstract This paper investigates the influence of the use of coal bottom ash as a Replacement for Natural fine aggregates on the properties of concrete in the fresh state. Tests for water loss through bleeding, and the determination of the setting times and plastic shrinkage, were carried out in order to evaluate the material in the presence of bottom ash. The influence of the porosity of bottom ash on the potential water absorption and water loss of the material, as well as on the water consumption of concretes produced with bottom ash, is also discussed. The results showed that in the fresh state the concretes produced with the bottom ash are susceptible to water loss by bleeding and the higher the percentage of bottom ash used as a Natural Sand Replacement the lower the deformation through plastic shrinkage. The results also showed that the setting time is affected by the presence of bottom ash in the concrete. In conclusion, different forms of bottom ash mix result in concretes with different properties in the fresh state, but the behavioral tendencies are maintained when bottom ash is employed as a Replacement for Natural aggregates.
L.b. Andrade - One of the best experts on this subject based on the ideXlab platform.
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influence of coal bottom ash as fine aggregate on fresh properties of concrete
Construction and Building Materials, 2009Co-Authors: L.b. Andrade, Janaíde Cavalcante Rocha, Malik CheriafAbstract:Abstract This paper investigates the influence of the use of coal bottom ash as a Replacement for Natural fine aggregates on the properties of concrete in the fresh state. Tests for water loss through bleeding, and the determination of the setting times and plastic shrinkage, were carried out in order to evaluate the material in the presence of bottom ash. The influence of the porosity of bottom ash on the potential water absorption and water loss of the material, as well as on the water consumption of concretes produced with bottom ash, is also discussed. The results showed that in the fresh state the concretes produced with the bottom ash are susceptible to water loss by bleeding and the higher the percentage of bottom ash used as a Natural Sand Replacement the lower the deformation through plastic shrinkage. The results also showed that the setting time is affected by the presence of bottom ash in the concrete. In conclusion, different forms of bottom ash mix result in concretes with different properties in the fresh state, but the behavioral tendencies are maintained when bottom ash is employed as a Replacement for Natural aggregates.
Mahyuddin Ramli - One of the best experts on this subject based on the ideXlab platform.
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the mechanical strength and durability properties of ternary blended cementitious composites containing granite quarry dust gqd as Natural Sand Replacement
Construction and Building Materials, 2019Co-Authors: Chee Ban Cheah, Jay Sern Lim, Mahyuddin RamliAbstract:Abstract Cementitious composites are the most used man-made materials in the world with a global annual production quantum of 25 billion tonnes worldwide, contributing approximately 5% to the global greenhouse gas emissions. In the initiative to reduce the carbon footprint of cementitious composite production, are growing interests in the large volume reuse of industrial by products such as ground granulated blast-furnace slag (GGBS), pulverized fuel ash (PFA) and granite quarry dust (GQD) in cementitious composites production. Such an approach offers a two-fold solution towards addressing the waste management problem related to those industry by-products. At the same time however; reduction of carbon footprints of cementitious composite materials exists. However, in order to enable scalable applications of such a recycling approach, a comprehensive body of knowledge on the mechanical strength and durability performance of the cementitious composite products containing a large volume of the materials needs to be established. Hence, it is the primary aim of the study to report a comprehensive assessment on the mechanical strength and durability properties of high strength cementitious composites. These materials are produced with a large volume of the aforementioned materials as the primary binder and aggregate phase. Throughout the investigation, high strength cementitious composites mixes were produced with a large volume of PFA and GGBS binder. Then phase coupled with ordinary Portland cement (OPC). GQD was used as the fine aggregate phase in substitution of Natural river Sand at various level of substitution ranging between 0 and 100% by volume. The cementitious composites were characterized in terms of its fresh cementitious composites. Its flowability and hardened cementitious composites properties mainly bulk density, compressive strength, flexural strength, and Ultrasonic Pulse Velocity were also assessed. In addition, the durability properties such as water absorptivity and porosity were also covered in this experimental program. Pore continuity was assessed in terms of air permeability and capillary absorption of the hardened specimens according to the testing age. This paper has also covered the dimensional stability assessment in terms of drying shrinkage. Besides, a comprehensive microstructural assessment was also performed to examine the microstructure morphology. From the results, we found full incorporation of GQD as NRS without significant impairment to the mechanical, durability and length change performance. Thus, the production of sustainable high strength cementitious composites with large volume recycling of GQD is feasible which in turn reduces the depletion on the Natural river Sand resources.
Janaíde Cavalcante Rocha - One of the best experts on this subject based on the ideXlab platform.
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influence of coal bottom ash as fine aggregate on fresh properties of concrete
Construction and Building Materials, 2009Co-Authors: L.b. Andrade, Janaíde Cavalcante Rocha, Malik CheriafAbstract:Abstract This paper investigates the influence of the use of coal bottom ash as a Replacement for Natural fine aggregates on the properties of concrete in the fresh state. Tests for water loss through bleeding, and the determination of the setting times and plastic shrinkage, were carried out in order to evaluate the material in the presence of bottom ash. The influence of the porosity of bottom ash on the potential water absorption and water loss of the material, as well as on the water consumption of concretes produced with bottom ash, is also discussed. The results showed that in the fresh state the concretes produced with the bottom ash are susceptible to water loss by bleeding and the higher the percentage of bottom ash used as a Natural Sand Replacement the lower the deformation through plastic shrinkage. The results also showed that the setting time is affected by the presence of bottom ash in the concrete. In conclusion, different forms of bottom ash mix result in concretes with different properties in the fresh state, but the behavioral tendencies are maintained when bottom ash is employed as a Replacement for Natural aggregates.
D N Naresh - One of the best experts on this subject based on the ideXlab platform.
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characteristic study of geopolymer fly ash Sand as a Replacement to Natural river Sand
Construction and Building Materials, 2017Co-Authors: U S Agrawal, S P Wanjari, D N NareshAbstract:Abstract The increase in construction activities is leading to the depletion and the exploitation of the Natural river Sand, causing adverse effects on the environment. Therefore there is an urgent need to find an alternative substitute or Replacement of Natural river Sand. Presently crushed Sand or high volume fly ash are used as Natural Sand Replacement, however geoploymer fly ash Sand could be better environment friendly Replacement. In this research geopolymer fly ash Sand (GFS) particles are prepared by geopolymerising fly ash and its properties are compared with Natural Sand which yield satisfactory results in terms of physical, chemical, mechanical and durability properties. GFS has comparable specific gravity (2.46), good particle size distribution (zone-I) and frictional angle (42°) as compared to Natural river Sand (NRS). Though GFS has pH (12.2) value and water absorption (5.61%) value slightly higher than the NRS, the soundness and the alkali silica reaction are within limits as per Indian Standard code. The mortar specimens with GFS achieved 93.6% at 28 day compressive strength as compared to NRS, indicating GFS has the potential to replace Natural river Sand in construction activities.
