Experiment on the uniaxial tensile mechanical behavior of basalt grid reinforced engineered cementitious composites and its constitutive model

Considering the reinforcement layer of basalt fiber reinforced polymer composites (BFRP) grid and mixing proportion of engineered cementitious composites(ECC), an experimental program on BFRP grid reinforced ECC with high-volume fly ash/slag powder was conducted under the uniaxial tensile loading. Based on the experimental results and the Richard-Abbot analytical model, a stress-strain model of BFRP reinforced ECC was established. The test results indicate that the ultimate tensile stress of reinforced ECC composite can get greatly improvement with the increase of basalt grid reinforcement. The ECC with slag powder has higher compressive strength and cracking strain/stress than those of ECC with fly ash in the same mixing ratio. The BFRP enhanced ECC with slag powder can get better tensile mechanical behavior. The analysis results show that the established model can effectively predict the stress-strain relationship and ultimate tensile strength of BFRP reinforced ECC.