Influence of Coarse Aggregate Shape on the Compressive Strength and Bending Resistance of Concrete

Abstract

The quality and type of coarse aggregate have a direct impact on the strength of concrete. As a result, four distinct types of coarse aggregates, including ones depending on shape, were used in this investigation. They contain coarse aggregates with a maximum size of 20 mm that are rounded, irregular, angular, and flaky in appearance. The concrete mixes were designed using the DoE method of mix design with a target compressive strength of 25 MPa at 28 days. After a 7-, 14-, and 28-day curing period, the compressive strength and flexural strength of the concrete mixes were assessed. The findings demonstrated that all coarse
aggregate kinds of concrete achieved the desired mean strength after 7 days of curing. Due to the interlocking of the aggregates,
concrete with irregular coarse aggregate had the maximum compressive strength, followed by concrete with angular aggregate, flaky aggregate, and concrete with round aggregate. Round, irregular, angular, and flaky concrete all had flexural strengths of
2.51, 3.65, 3.45, and 2.76 MPA at 28 days, respectively. This means that, similar to the compressive strength, the flexural strength of irregular aggregate concrete was highest and round aggregate concrete had the lowest values. Therefore, it was determined that particles' internal structure, surface nature, and form significantly affect concrete strength.