玻璃粉混凝土干燥收缩影响效果及作用机理研究  

Study on effect and mechanism of drying shrinkage of glass powder concrete

作　　者：黄达 高鹏飞[1,2] 刘光焰 陈宣东[1,2] HUANG Da;GAO Pengfei;LIU Guangyan;CHEN Xuandong(Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin 541004,China;College of Civil and Architecture Engineering,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]广西建筑新能源与节能重点实验室,广西桂林541004 [2]桂林理工大学土木与建筑工程学院,广西桂林541004

出　　处：《混凝土》2021年第2期77-81,共5页Concrete

基　　金：国家自然科学基金(51468014);广西建筑新能源与节能重点实验室项目基金(桂科能19-J-21-5)。

摘　　要：玻璃粉既能作为辅助胶凝材料又能有效抑制混凝土的干燥收缩,是当前绿色混凝土的一个研究热点。对比恒温恒湿环境和自然环境养护下,玻璃粉掺量、粒径以及环境温度、湿度对混凝土干燥收缩的影响效果和变化规律,分析其作用机理。结果表明:(1)恒温恒湿和自然环境养护下,掺入10%~30%掺量和0~75μm粒径的玻璃粉均能有效抑制混凝土的干燥收缩;(2)玻璃粉抑制干燥收缩的效果随玻璃粉掺量增加而增大,随玻璃粉粒径减小而增大;玻璃粉掺量对混凝土干缩率的影响效果大于玻璃粉粒径对混凝土干缩率的影响效果;(3)相较于环境温度,环境湿度对玻璃粉混凝土的干燥收缩影响更大。Glass powder can not only be used as an auxiliary cementitious material but also can effectively inhibit the drying shrinkage of concrete,and it is a research hotspot of green concrete.The effect and variation rule of glass powder content,particle size,environmental temperature and humidity on concrete drying shrinkage.Under constant temperature and humidity environment and natural environment conservation were investigated,and the mechanism of dry shrinkage of glass powder concrete were explored.The results show that(1)Under the constant temperature and humidity and natural environment conservation,glass powder with 10%~30%content and 0~75μm particle size can effectively inhibit the drying shrinkage of concrete.(2)The inhibition effect increases with the increase of the content of glass powder,and increases with the decrease of the particle size of the glass powder.The effect of the content of glass powder on the shrinkage rate of concrete is greater than the effect of the particle size of glass powder on the shrinkage rate of concrete.(3)Compared with the ambient temperature,the ambient humidity has a greater influence on the drying shrinkage of the glass frit concrete.

关 键 词：玻璃粉 混凝土 干燥收缩 作用机理 

分 类 号：TU528.041[建筑科学—建筑技术科学]