The corrosion of concrete and environmental pollution have become major challenges for the conventional concrete used in sea beds. Comprehensive research work has been carried out to enhance the strength and effectiveness of artificial reef (AR) concrete, because of its significant benefits for the sea coastlines to enhance algae growth, fish assembly, rehabilitation, and soil erosion. An experimental investigation of the compressive strength, water absorption, flexural, split tensile strength, and sorptivity of concrete specimens used for artificial reefs concrete immersed in seawater is presented here. Natural recycled materials used in this research work includes fly ash, seashells, rice-husked ash, silica fumes, granite powder, paper pulp, and coconut fiber. To investigate the corrosion behaviors of concrete based on the M20 standard, experiments were conducted using different proportions of raw materials. Concrete strength was observed on different days (7, 14, 28, 56, and 90) and the results showed that artificial reef concrete is stronger than conventional concrete. Moreover, the strength of concrete is increased by 3% due to the addition of 5% of silica fume and granite powder. It also shows that the attack of sulfate in the concrete decreases gradually by the addition of rice husk ash and silica fume. In addition to other recycled biodegradable materials like AR2, AR3, and AR4 have flexural strengths such as 1.90%, 4.08%, and 5.07% which is higher than the conventional concrete, respectively. These approaches were eco-friendly to the ocean, because of the application of silica fumes and flyash and it does not create any type of crack in the reef. It is cost-effective and environmentally favorable. The splitting tensile strength of the traditional mixer after 28 days is measured in 2.94 MPa, which was found to be 2.11%, 4.79%, 4.68%, 23.81%, and 28.78% and it is higher than the values observed in the other specimens.

来源平台：MARINE GEORESOURCES & GEOTECHNOLOGY