超细微粉对再生骨料混凝土性能的影响  

Influence of Ultrafine Powder on Properties of Recycled Aggregate Concrete

作　　者：王浩 杨鲁 谭盐宾 李林香 葛昕 郑永杰 WANG Hao;YANG Lu;TAN Yanbin;LI Linxiang;GE Xin;ZHENG Yongjie(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;State Key Laboratory for Track Technology of High-Speed Railway,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [2]高速铁路轨道技术国家重点实验室,北京100081

出　　处：《铁道建筑》2021年第2期134-138,共5页Railway Engineering

基　　金：中国铁道科学研究院集团有限公司基金(2018YJ055)。

摘　　要：制备3种配合比的再生骨料混凝土,对其进行了抗压强度、抗冻性能等测试,研究硅灰和玻璃微珠2种超细微粉对再生骨料混凝土泵送性能、力学性能和耐久性能的影响。结果表明:掺加适量硅灰和玻璃微珠能降低新拌混凝土有效黏度、泵送压力、电通量,提高混凝土的耐久性能并能改善混凝土孔结构;掺加玻璃微珠的混凝土有效黏度和泵送压力均低于掺加硅灰的;而掺加硅灰的混凝土抗压强度和耐久性能均高于掺加玻璃微珠的;掺加硅灰的混凝土孔结构优于掺加玻璃微珠的。Three kinds of recycled aggregate concrete with different mix proportions were prepared,and their compressive strength and frost resistance were tested.The effects of silica fume and glass microsphere on pumping performance,mechanical properties and durability of recycled aggregate concrete were studied.The results show that adding appropriate amount of silica fume and glass microsphere can reduce the effective viscosity,pumping pressure and electric flux of fresh concrete,enhance the durability of concrete and improve the pore structure of concrete.The effective viscosity and pumping pressure of concrete with glass microsphere are lower than those with silica fume.The compressive strength and durability of concrete with silica fume are higher than those with glass microsphere,and the pore structure of concrete with silica fume is better than that with glass microsphere.

关 键 词：混凝土性能 超细微粉 试验研究 硅灰 玻璃微珠 再生骨料 泵送性能 孔结构 

分 类 号：TU528[建筑科学—建筑技术科学]