摘  要：針對超高性能混凝土（UHPC）膠凝材料用量大、非綠色化、成本高、自收縮大等問題，通過引入5～10 mm粒徑的粗骨料，采用普通河砂代替石英砂，并優化鋼纖維體積摻量，成功制備出了經濟環境效益良好、性能優良的含粗骨料超高性能混凝土（UHPC-CA）。研究了粗骨料摻量對UHPC-CA工作性和力學性能的影響，并與UHPC性能進行了對比分析。結果表明，UHPC-CA的流動性能相比UHPC有所降低，粗骨料摻量為675 kg/m³的UHPC-CA能保持良好流動性能，但隨著粗骨料摻量的增加，流動性降低的十分明顯；UHPC-CA抗壓強度、抗折強度低于UHPC，彈性模量則高于UHPC，不同粗骨料摻量UHPC-CA力學性能變化并不明顯；UHPC-CA抗氯離子滲透性能和抗凍性能表現良好，但是不如UHPC優異；摻入粗骨料能夠改善UHPC-CA的自收縮性能，相比UHPC，其早期自收縮率明顯降低。
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.