Effect of fine modulus of coarse aggregate on the mechanical properties of concrete submerged in seawater

The durability of concrete can be determined by mixing coarse aggregate, fine aggregate, cement, and water, with or without additives. The properties of concrete can be influenced by several things, such as the mixture ratio, mixing method, transportation method, molding method, and compaction method. To analyze the values of compressive strength, flexural strength and split tensile strength of concrete submerged in seawater with variations in fineness modulus. The research used 3 variations in fineness modulus of coarse aggregate, 6.0, 6.52, and 7.1 with fresh water and sea water treatments. The compressive strength results were 35.67Mpa, 31.63Mpa, 29.30Mpa respectively, while the compressive strength of concrete soaked in sea water was 36.94Mpa, 36.52Mpa and 30.15Mpa. The splitting tensile strength results were 2.71Mpa, 2.65Mpa, and 1.91MPa respectively, while the splitting tensile strength of concrete submerged in seawater with the same variations were 3.29MPa, 2.76MPa and 2.12MPa respectively. The flexural strength results were 4.22Mpa, 4.21Mpa, and 4.14MPa respectively, while the flexural strength of concrete submerged in seawater with the same variations was 4.27MPa, 4.22MPa and 4.18MPa respectively. The influence of the fine grain modulus on the resulting compressive strength, split tensile strength and flexural strength is very significant, the higher the coarse aggregate fineness modulus, the smaller the resulting value.