再生混凝土粉末对碱激发UHPC宏观性能及微观结构的影响  

Influence of recycled concrete powder on alkali-activated UHPC macroscopic properties and microstructure

作　　者：张潇 宋承哲 余睿[2] ZHANG Xiao;SONG Chengzhe;YU Rui(Liaoning Provincial Communication Planning&Design Institute Co.Ltd.,Shenyang 110000,China;Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]辽宁省交通规划设计院有限责任公司,辽宁沈阳110000 [2]武汉理工大学,湖北武汉430070

出　　处：《新型建筑材料》2025年第3期113-117,共5页New Building Materials

基　　金：辽宁省交通科技项目(202222)。

摘　　要：以再生混凝土粉末(RCF)替代矿粉制备碱激发超高性能混凝土(UHPC),研究其宏观性能、微观结构及水化机理。结果表明,当RCF掺量为10%~30%时,碱激发UHPC的流动性好,流动度为160~210 mm,凝结时间短,终凝时间为16~21 min,抗压强度高,28d抗压强度约为120 MPa。掺入RCF加速了碱激发UHPC的水化进程,并提高了胶凝材料的水化程度。RCF颗粒作为水化产物的成核位点,促进了水化产物的生成与分布。LCA评价表明,当RCF掺量为30%时,碱激发UHPC的碳排放仅为普通硅酸盐水泥UHPC碳排放的70%,采用RCF制备碱激发UHPC是一种环保的建筑材料,符合可持续发展的趋势。In this study,recycled concrete powder was used in replace of the mineral powder to prepare alkali-activated UHPC,and the macroscopic properties,microscopic properties,and hydration mechanism of alkali-activated UHPC was analyzed.The results show that when the content of recycled concrete powder was between 10%and 30%,the prepared alkali-activated UHPC exhibited good flowability(160~210 mm),fast setting time(16~21 min),and high compressive strength(approximately 120 MPa at 28 d).The study of hydration mechanism showed that the addition of recycled concrete powder could accelerate the hydration process of the prepared alkali-activated UHPC,enhancing the hydration degree of the alkali-activated UHPC binder material.The recycled concrete powder particles served as nucleation sites for hydration products,speeding up the appearance and distribution of hydration products.Life cycle assessment(LCA)of alkali-activated UHPC revealed that when the content of recycled concrete powder is 30%,the carbon emissions of alkali-activated UHPC in this study were significantly lower than those of ordinary Portland cement UHPC,accounting for only 70%of the conventional UHPC,indicating that alkali-activated UHPC prepared using RCF is an environmentally friendly building material that conforms to the trend of sustainable development.

关 键 词：再生混凝土粉末 碱激发 超高性能混凝土 

分 类 号：TU528[建筑科学—建筑技术科学]