Effect of constituent content on mechanical behaviors of ultra-high performance seawater sea-sand concrete

In this study, the mechanical behaviors of ultra-high performance seawater sea-sand concrete were investigated considering various constituent contents of sea shell (SH), coarse aggregate (CA), and basalt fiber reinforced polymer minibars (MB). Experimental results reveal that the mechanical strength first increased and then decreased as the SH content increased, which was attributed to the evolution of macroscopic pores. CA, which preferable content was 10%, hurt the workability and flexural strength of the matrix; in contrast, owing to its skeletal effect, the compressive strength increased at a small content of CA. Moreover, the utilization of the MB increased the compressive strength and flexural toughness and this enhancement is positively correlated with the increase in the minibar content.