明 阳1,2,3,李顺凯1,2,3,沈尔卜1,2,3,高玉军1,2,3,甘国兴1,2,3
明阳,李顺凯,沈尔卜,等.低水化热低收缩超高性能混凝土(UHPC)试验研究[J].混凝土与水泥制品,2019(3):6-9.
MING Y,LI S K,SHEN E B,et al.Experimental Research on Low Hy dration Heat and Low Shrinkage of Ultra High Performance Concrete (UHPC)[J].China Concrete and Cement Products,2019(3):6-9.
低水化热低收缩超高性能混凝土(UHPC)试验研究
明 阳1,2,3,李顺凯1,2,3,沈尔卜1,2,3,高玉军1,2,3,甘国兴1,2,3
明阳,李顺凯,沈尔卜,等.低水化热低收缩超高性能混凝土(UHPC)试验研究[J].混凝土与水泥制品,2019(3):6-9.
MING Y,LI S K,SHEN E B,et al.Experimental Research on Low Hy dration Heat and Low Shrinkage of Ultra High Performance Concrete (UHPC)[J].China Concrete and Cement Products,2019(3):6-9.
摘 要:采用紧密堆积理论优化出了超高性能混凝土(UHPC)胶凝材料体系各组分比例,通过掺加钢渣粉和复合膨胀剂配制出低水化热低收缩UHPC,并通过SEM分析了UHPC水化产物和界面黏结微观结构。结果表明,采用大掺量矿物掺合料优化胶材体系和骨料体系可制备出工作性良好、标养条件抗折强度达25.6 MPa、抗压强度达142 MPa的UHPC,绝热温升仅59.7 ℃,180 d干燥收缩率仅280×10-6。钢渣粉的掺入不仅能有效降低UHPC水化热,对抑制收缩也有一定作用。
Abstract: The proportion of each component of the cementitious material system is optimized by the compact packing theory, UHPC with low hydration heat and low shrinkage is prepared by adding steel slag powder and composite expansion agent. The hydration products and interface bonding microstructure of UHPC are characterized by SEM. The results show that UHPC with good working performance can be prepared by using high content of mineral admixture , the flexural strength is up to 25.6 MPa and the compressive strength is up to 142 MPa, the adiabatic temperature rise is only 59.7 ℃, the drying shrinkage rate of 180 d is only 280×10-6, the hydration heat and drying shrinkage can be reduced by adding steel slag powder.
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