Concrete is one of the most inexpensive and sustainable materials in marine environments that can be considered in any geometric form. Various parameters affect the quality of concrete mixes, one of which is concrete additives. Therefore, using concrete additives and selecting the appropriate ratio of this additive to the proper water-to-cement ratio can reduce the deterioration of concrete against marine environmental factors. Experiments conducted on fresh concrete include slump tests and tests of hardened concrete properties including compressive strength at different ages (7, 14, 28 and 90 days), indirect tensile strength (28 days), and water absorption test for samples. The results of these experiments indicate that the compressive strength of samples with a lower water-to-cement ratio indicates more. The maximum compressive strength of concrete is related to plan B1 with water-to-cement ratio of 40/0. The increase in compressive strength of this design, which is related to the microsilicon additive, is 12%. Also, reducing the water-to-cement ratio in concrete has increased the compressive strength of concrete. Therefore, according to these results, although microsilicon increases the compressive strength of concrete, it reduces the tensile strength and increases the absorption of water, which reduces the structural durability and increases corrosion.