Influence of micromechanical property on the rate-dependent flexural strength of ultra-high performance concrete containing coarse aggregates (UHPC-CA)

The flexural strength of ultra-high performance concrete with basalt aggregates (UHPC-CA) strongly depends on the micromechanical property CA, interfacial transition zone (ITZ) and matrix. However, influence rate-dependent UHPC-CA has not been well understood. Here, different initial distributions are produced by controlling hydration development, its influences investigated a multi-scale analysis method. results show that more homogeneous in higher strength, but lower dynamic increase factor (DIF) strength. DIF can mainly be attributed to increasing rate mesoscale fracture CA. Moreover, based meso-mechanical model, it is revealed toughness ratios ITZ/CA ITZ/Matrix result critical angles ( ? c r ) fractures CA matrix, consequently, mechanical contribution from