掺陶砂超高性能轻质混凝土的性能及其影响因素  

Performance of Ultra-High Performance Lightweight Concrete with Pottery Sand and Its Influencing Factors

作　　者：王青 高舒畅[1,2] 高嘉呈 文长城 徐港 WANG Qing;GAO Shuchang;GAO Jiacheng;WEN Changcheng;XU Gang(Hubei Key Laboratory of Disaster Prevention and Mitigation,Yichang 443002,China;College of Civil Engineering&Architecture,China Three Gorges University,Yichang 443002,China)

机构地区：[1]防灾减灾湖北省重点实验室,宜昌443002 [2]三峡大学土木与建筑学院,宜昌443002

出　　处：《硅酸盐通报》2023年第6期1996-2006,2026,共12页Bulletin of the Chinese Ceramic Society

基　　金：国家级地方高校能源和环境材料化学学科创新引智基地(D20015);高等学校学科创新引智计划资助(D20015);土木工程防灾减灾湖北省引智创新示范基地(2021EJD026)。

摘　　要：本文研究了水胶比、胶砂比、粉煤灰掺量、硅灰掺量、钢纤维掺量和陶砂密度等级对掺陶砂超高性能轻质混凝土(UHPLC)工作性能、力学性能、表观密度和比强度的影响,确定了最佳配合比,制得了干表观密度为1 950 kg/m^(3)、流动度为233 mm(略高于超高性能混凝土)、28 d抗压/抗折强度不小于120/20 MPa的UHPLC。借助X射线衍射仪和扫描电子显微镜,探讨了UHPLC水化产物、微观形貌随时间的变化规律,并从微观结构角度分析了陶砂与基体、钢纤维与基体的界面过渡区特征,揭示了相同条件下UHPLC比强度随陶砂密度等级增大而增大的变化规律。经过标准化回归系数分析,发现钢纤维掺量对UHPLC强度、密度影响最大,贡献率均大于40%,而对UHPLC流动性影响最显著的因素是水胶比,贡献率为38.18%,胶砂比对流动性有较为明显的影响,贡献率为27.20%。The effects of water-binder ratio,binder-sand ratio,fly ash content,silica fume content,steel fiber content and density grade of pottery sand on working performance,mechanical properties,apparent density and ratio of strength to density of ultra-high performance lightweight concrete(UHPLC) with pottery sand were studied,and the optimal mix ratio was determined.UHPLC with dry apparent density of 1 950 kg/m^(3),fluidity of 233 mm(slightly higher than that of ultra-high performance concrete) and 28 d compressive/flexural strength not less than 120/20 MPa was prepared.By means of X-ray diffractometer and scanning electron microscope,the variation laws of UHPLC hydration products and microstructure with time were discussed.From the perspective of microstructure,the characteristics of interface transition zone between pottery sand and matrix,steel fiber and matrix were analyzed,and the change law of ratio of strength to density of UHPLC increasing with the increase of density grade of pottery sand was revealed under the same conditions.Through standardized regression coefficient analysis,the results indicate that steel fiber content has the greatest influence on the strength and density of UHPLC,and the contribution rates are greater than 40%.The most significant influence on the fluidity of UHPLC is the water-binder ratio,and the contribution rate is 38.18%.The binder-sand ratio has a more obvious influence on the fluidity of UHPLC,and the contribution rate is 27.20%.

关 键 词：超高性能轻质混凝土 陶砂 钢纤维 水胶比 表观密度 贡献率 

分 类 号：TU528.2[建筑科学—建筑技术科学]