International Journal For Multidisciplinary Research

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Effects of Size of Coarse Aggregates on the Compressive Strength of Concrete

Author(s) Rokhshana Parvin, Md. Tanvir Ahmed, Md. Nahiduzzaman Nahid, Mohammed Abdul Jalil, Sheikh Aurangazeb Babar
Country Bangladesh
Abstract Concrete is formed by mixing cement, sand, gravel, and water, which then hardens into a robust and long-lasting material. It is extensively utilized in various construction and infrastructure projects due to its strength and durability (Neville, 2011). The strength of concrete is determined by multiple factors, including the size of the aggregates, the porosity, the void ratio, and the proportions in the mix (Mehta and Monteiro, 2005). In concrete production, two forms of aggregate are utilized: fine aggregate and coarse aggregate. Two types of aggregates, coarse and fine, are used in the production of concrete (Shetty, 2005). Fine aggregates fill the voids within coarse aggregates, and cement paste fills the voids within fine aggregates, effectively binding the individual aggregates together into a solid structure with the aid of water (Mindess and Young, 2003). The main objective of the study was to examine how the size of coarse aggregate influences the compressive strength of concrete. In pursuit of the research objective, a total of 24 cylinders were tested, each having a diameter of 4 inches and a height of 8 inches. Physical parameters like specific gravity, absorption capacity, and unit weight of both coarse and fine aggregates were evaluated to choose the appropriate aggregate. The Fineness Modulus (F.M) of the coarse aggregate was set at 4.81 and 6.8 to introduce variability in the coarse aggregate composition. The water-cement ratio and other parameters remained constant to observe changes in concrete strength. The mix ratios were 1:1.5:3.0 and 1:2:3.0, with a consistent water-cement ratio of 0.5. From the research it has been observed that the larger the F.M (i.e., the size of the coarse aggregate) the lower the compressive strength of concrete. In this research the compressive strength of concrete having F.M 4.81 of coarse aggregate and mix ratio 1:1.5:3 has found 3.86 % higher in 7 days, 3.0 % higher in 14 days and 3.12 % higher in 28 days as compared to aggregate having F.M 6.8. For the same concrete having mix ratio of 1:2:3, the compressive strength of concrete for F.M of coarse aggregate has found 5.71 % higher in 7 days, 1.30 % higher in 14 days and 2.42 % higher in 28 days. Our study revealed that aggregates with a Fineness Modulus (F.M) of 4.81 exhibited greater strength compared to those with an F.M of 6.8, indicating that smaller aggregate sizes contribute to higher strength.
Keywords Coarse aggregate, compressive strength, Fineness Modulus (F.M), Mix ratio.
Field Engineering
Published In Volume 6, Issue 4, July-August 2024
Published On 2024-07-27
Cite This Effects of Size of Coarse Aggregates on the Compressive Strength of Concrete - Rokhshana Parvin, Md. Tanvir Ahmed, Md. Nahiduzzaman Nahid, Mohammed Abdul Jalil, Sheikh Aurangazeb Babar - IJFMR Volume 6, Issue 4, July-August 2024.
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E-ISSN 2582-2160
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