Experimental study on tensile and bending properties of sea sand ECC reinforced by BFRP bars under chloride salt erosion

In order to popularize the use of marine resources, sea sand was used to prepare engineering cementitious composite (ECC) instead of silica sand. By combining sea sand ECC with basalt fiber reinforced polymer (BFRP) bars, the advantages of the two kinds of materials can be fully exploited to obtain higher corrosion resistance and better tensile properties. Through uniaxial tensile and four-point bending tests, the effects of different erosion systems and reinforcement ratio on the tensile and bending properties of BFRP reinforced sea sand ECC were studied, and compared with the sea sand ECC without BFRP reinforcement. The results show that the ultimate tensile stress of BFRP reinforced sea sand ECC is increased by 2.46-4.92 times and the ultimate tensile strain is increased by 1.4-2.94 times compared with the sea sand ECC. The ultimate load of BFRP reinforced sea sand ECC is 3.14-4.29 times of the sea sand ECC without BFRP reinforcement under the effect of dry-wetting cycling. Under different erosion systems, the optimal reinforcement ratio of BFRP reinforced sea sand ECC is 0.67%. The BFRP reinforced sea sand ECC can provide reference for the design of seamless bridge deck.