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Study of utilization of fly ash as a replacement of cement and fine aggregates in concrete

Rkein, Mohamad (2015). Study of utilization of fly ash as a replacement of cement and fine aggregates in concrete. Bachelor of Engineering (4th Year Project) Thesis, Charles Darwin University.

Document type: Thesis
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Author Rkein, Mohamad
Title Study of utilization of fly ash as a replacement of cement and fine aggregates in concrete
Institution Charles Darwin University
Publication Date 2015
Thesis Type Bachelor of Engineering (4th Year Project)
0905 - Civil Engineering
Abstract Concrete is a construction material that is mostly used across the world. It is a composite material made out of water, cement, fine aggregate (sand) and coarse aggregate (stones). However, the manufacturing process of raw materials used in concrete such as cement and aggregate causes environmental influences (emission of greenhouse gases and dust) and significantly consumes energy and natural resources.

Aggregate normally accounts 70 to 80 % of the entire volume of concrete, while water and cement account 20 to 30 %. These percentages affect the mechanical properties of concrete. Replacing any of these materials by industrial waste material can have a positive impact on the environment as it diminishes the problem of waste disposal and reduces the intensive use of energy and natural resources (aggregate mining). In addition; it reduces the amount of emission of gases. There are plenty of industrial wastes that can be used in concrete as either replacement of aggregate or cement. Hence, this project has focused on evaluating the opportunity of using one of these waste materials which is the fly ash as a partial replacement material for cement and fine Aggregate.

Fly ash is generally considered as a waste material that is produced as a by-product of coal combustion process. The physical and chemical properties of fly ash are similar to cement, which allows it to be used in concrete. The primary aim of this research is to determine the feasibility of using fly ash as a replacement of cement and fine aggregate in concrete and their effects on the mechanical properties of concrete.

This Paper presents the results of an experimental investigation carried out to evaluate the mechanical properties (workability and compressive strength) of concrete mixtures in which fine aggregate (sand) and cement were partially replaced with Fly Ash. Both fine aggregate and cement were replaced with five percentages (10%, 20%, 30%, 40%, and 50%) of fly ash by weight. Tests were conducted for properties of fresh concrete (workability), and compressive strength was determined at 7, 28 and 56 days. Test results indicate significant improvement in the strength properties of plain concrete by the inclusion of fly ash as partial replacement of either fine aggregate (sand) or cement and can be effectively used in concrete structures.
Keyword Concrete
Fly Ash
Fine Aggregate (Sand)
Workability and Compressive Strength

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