海砂颗粒级配对UHPC性能的影响

Effects of Sea Sand Particle Size on the Properies of Ultra High Performance Concrete

针对海砂颗粒级配的优化,运用混料设计的方法,将A、B、C、D四个粒径段海砂分别作为四个变量进行了设计分析。建立了具有良好统计学意义的流动度模型、抗压强度模型及抗折强度模型,并利用响应面法系统分析了各粒径段海砂对超高性能混凝土(UHPC)的流动度、抗压强度及抗折强度作用规律。通过对所建模型进行多目标同步优化,得出了海砂各粒径段掺量的优化方案,制备出了流动度良好、28 d抗压强度超过130 MPa、抗折强度超过29 MPa的UHPC。

Aiming at the optimization of sea sand particle grading, four kinds of sea sand, A, B, C and D with different particle sizes, were used as four variables. The fluidity model, compressive strength model and flexural strength model with statistical significance were established.The response surface methodology was used to analyze the effects of sea sand on the fluidity, compressive strength and flexural strength of ultra-high performance concrete(UHPC). Through the multi-objective optimization of the models, the optimization plan for the amount of sea sand of each particle size segment was obtained.The UHPC with good fluidity, 28 d compressive strength over 130 MPa and flexural strength exceeding 29 MPa was prepared.