废弃混凝土再生粉制备超高性能混凝土基体的性能研究  

Properties of Ultra-High Performance Concrete Matrix Prepared with Powder of Waste Concrete

作　　者：彭术 陈浩 水中和 余睿 王鑫鹏 凌刚 PENG Shu;CHEN Hao;SHUI Zhong-he;YU Rui;WANG Xing-peng;LING Gang(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Zhongan Raybo Construction Group Co.Ltd,Zhongshan 528400,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan 430070,China;Wuhan University of Technology Advanced Engineering Technology Research Institute of Zhongshan City,Zhongshan 528400,China)

机构地区：[1]武汉理工大学材料科学与工程学院,武汉430070 [2]中安瑞宝建设集团有限公司,中山528400 [3]硅酸盐建筑材料国家重点实验室,武汉430070 [4]中山市武汉理工大学先进工程技术研究院,中山528400

出　　处：《硅酸盐通报》2019年第7期2125-2130,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51608409);2016年中山市新型研发机构专项(重大研发平台建设补贴2016F2FC0008);广东省中山市重大科技专项(2017A1021);2016年广东省省级科技计划项目(产学研合作项目2016A090924002);National Key Research and Development Program of China(2016YFC0305101)

摘　　要：通过研究废弃混凝土再生粉取代水泥(0、10%、20%、30%、40%、50%取代)对超高性能混凝土(Ultra high performance concrete,UHPC)性能的影响,验证使用废弃混凝土再生粉制备UHPC的可行性。结果表明,再生粉取代水泥降低了UHPC基体的工作性能和抗折强度,但使用50%的再生粉取代水泥制备的UHPC基体28 d抗压强度与基准组相当;使用废弃混凝土再生粉制备UHPC基体具有较好的抗渗性能;随再生粉取代量的增加,UHPC基体的早期自收缩下降;XRD分析结果表明使用废弃混凝土再生粉取代水泥并不改变水化产物的种类;但掺加废弃混凝土再生粉能明显缩短UHPC基体的水化诱导期,降低累积释放热。除此之外,使用废弃混凝土再生粉制备的UHPC基体能耗显著降低。The effects of replacing cement by powders from construction and demolition waste(replace 0,10%,20%,30%,40%,50%)on UHPC matrix were studied,UHPC matrix with powder of waste concrete feasibility was proved.The experimental results show that the workability and flexural strength of eco-efficient UHPC matrix are reduced with increasing addition of powders from C&D waste(construction and demolition waste),while comparable 28 d compressive strength is generated even with 50% replacement of cement.UHPC matrix of replacing cement by powder of construction waste still has good impermeability.With the increase of addition of powders from C&D waste,the early autogenous shrinkage of UHPC matrix decreases.The hydration induction period of UHPC matrix and the cumulative release heat decreases with the addition of C&D waste.XRD analysis shows that the replacing cement by powder of C&D waste does not alter the type of hydration products.Besides,energy consumption analysis shows that it is feasible to develop eco-efficient UHPC matrix via replacing cement by the powders from C&D waste.

关 键 词：超高性能混凝土 废弃混凝土再生粉 性能评价 

分 类 号：TU528[建筑科学—建筑技术科学]