摘  要：针对超高性能混凝土（UHPC）胶凝材料用量大、非绿色化、成本高、自收缩大等问题，通过引入5～10 mm粒径的粗骨料，采用普通河砂代替石英砂，并优化钢纤维体积掺量，成功制备出了经济环境效益良好、性能优良的含粗骨料超高性能混凝土（UHPC-CA）。研究了粗骨料掺量对UHPC-CA工作性和力学性能的影响，并与UHPC性能进行了对比分析。结果表明，UHPC-CA的流动性能相比UHPC有所降低，粗骨料掺量为675 kg/m³的UHPC-CA能保持良好流动性能，但随着粗骨料掺量的增加，流动性降低的十分明显；UHPC-CA抗压强度、抗折强度低于UHPC，弹性模量则高于UHPC，不同粗骨料掺量UHPC-CA力学性能变化并不明显；UHPC-CA抗氯离子渗透性能和抗冻性能表现良好，但是不如UHPC优异；掺入粗骨料能够改善UHPC-CA的自收缩性能，相比UHPC，其早期自收缩率明显降低。
Abstract: Regarding to the problem that the ultra high performance concrete(UHPC) needs a large amount of cementing material, non-greening, high cost and has a high self-shrinkage, the ultra high performance concrete with coarse aggregate(UHPC-CA) with good economical and environmental performance and excellent performance was successfully prepared with coarse aggregate of 5～10 mm particle size, ordinary river sand and optimized amount of steel fiber. The effect of coarse aggregate content on the working performance and mechanical properties of UHPC-CA was studied, and all the performance of UHPC-CA while compared with UHPC were analyzed. The results show that the flow performance of UHPC-CA is lower than that of UHPC and with the increase of coarse aggregate content from 675 kg/m³ to 825 kg/m³, the fluidity is obviously reduced. The compressive strength and anti-folding strength of UHPC-CA are lower than UHPC, however, the elastic modulus is higher than that of UHPC. The change of the mechanical properties of UHPC-CA with different coarse aggregates content is not obvious. UHPC-CA has good performance against chloride ion permeation and good antifreeze performance, but both not as good as that of UHPC. The coarse aggregate can improve the self-shrinkage performance of UHPC-CA and its early self-shrinkage rate is significantly lower than that of UHPC.