摘要
采用陶瓷再生砂等体积替代全部石英砂,研究了不同水胶比(0.16~0.22)下超高性能混凝土(UHPC)的性能。结果表明,在流动度为(210±10)mm时,陶瓷砂组UHPC减水剂掺量较石英砂组增大了0.2~1.1个百分点;水胶比相同时,陶瓷砂组UHPC各龄期下的抗折、抗压强度均高于石英砂组,28 d抗折强度较石英砂组提高1.19%~13.94%,28 d抗压强度提高1.36%~4.08%;陶瓷砂组UHPC的72 h自收缩较石英砂组减小约50%。这是因为,陶瓷砂轻质高强、表面粗糙多孔可优化界面过渡区并发挥内养护作用。陶瓷再生砂可作为UHPC的优质骨料,在不同水胶比下均兼具提高力学性能与抑制自收缩的作用。
The performance of ultra-high performance concrete(UHPC)under different water cement ratios(0.16~0.22)was studied by replacing all quartz sand with ceramic recycled sand.The results show that under the same fluidity(210±10 mm),the water reducing agent dosage of UHPC matrix prepared with ceramic sand is 0.2~1.1 percent points higher than that of quartz sand;the 28 d compressive strength is increased by 1.36%~4.08%,the flexural strength is increased by 1.19%~13.94%,and the advantage of the 28 d strength is gradually significant with the increase of water-to-binder ratios;and the 72 h autogenous shrinkage after final setting was reduced by approximately 50%.The lightweight and high strength of ceramic sand,with its porous surface and ink-bottle pore structure,optimized the interfacial transition zone and exerted an internal curing effect,which is the main reason for its performance improvement.The study demonstrates that ceramic recycled sand serves as an excellent UHPC aggregate,effectively enhancing mechanical properties and mitigating autogenous shrinkage across varying water-to-binder ratios.
作者
杨医博
杨雯
刘福财
余俊曦
黄芷欣
陈睿智
郭文瑛
王恒昌
YANG Yibo;YANG Wen;LIU Fucai;YU Junxi;HUANG Zhixin;CHEN Ruizhi;GUO Wenying;WANG Hengchang(School of Civil Engineering&Transportation,South China University of Technology,Guangzhou 510641,China;State Key Laboratory of Subtropical Building and Urban Science,Guangzhou 510641,China;Guangdong Gaiteqi New Material Technology Co.Ltd.,Qingyuan 511600,China)
出处
《新型建筑材料》
2025年第5期46-50,54,共6页
New Building Materials
基金
2023年清远市科技计划项目(2023KLL016)。
关键词
陶瓷再生砂
UHPC基体
力学性能
自收缩
ceramic recycled sand
UHPC matrix
mechanical properties
autogenous shrinkage
