水泥特性对UHPC水化性能及抗压强度的影响分析

Effect of Cement Properties on Hydration Performance and Compressive Strength of UHPC

超高性能混凝土(UHPC)是一种新型水泥基复合材料,具有超高的力学性能、良好的材料韧性及优异的抗冲击性能与耐久性能。基于采用不同水泥制备的超高性能混凝土试件的试验研究,分析了水泥颗粒粒径、成分对UHPC体系水化放热速率和放热量、微观孔隙结构以及不同龄期抗压强度的影响规律,建立了水化动力学特性、微观孔隙结构以及宏观力学性能间的关联,揭示了水泥对UHPC水化动力学特性及力学性能的影响机理。

Ultra-high performance concrete(UHPC)is a new type of cement-based composite material with ultra-high mechanical properties,good toughness,excellent impact resistance and durability.Based on the experimental study of ultra-high performance concrete specimens prepared with different cements,the effects of cement particle size and composition on the hydration exothermic rate and heat release,micro-pore structure and compressive strength at different ages of UHPC system are analyzed,and the relationship between hydration kinetics,micro-pore structure and macroscopic mechanical properties is established.The mechanism of the effect of cement on the hydration kinetics and mechanical properties of UHPC is revealed.