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机制砂含泥量对混凝土气泡参数的影响研究
作者：方小利1，李炜2，王安书2，庄智杰2，邓林2
（1.云南众恒集团 云南恒达混凝土有限公司，云南 昆明 650032；
2.江苏苏博特新材料股份有限公司，江苏 南京 211108）
2.江苏苏博特新材料股份有限公司，江苏 南京 211108）
摘要：控制机制砂含泥量为0~10%，分别采用混凝土含气量仪与气泡参数分析系统，研究了机制砂含泥量对商品混凝土含气量、经时含气量损失率、气泡间距系数及硬化外观气孔分布等气泡参数的影响规律。结果表明：当机制砂含泥量小于6%时，随含泥量的增加，混凝土的含气量及其经时损失率逐渐增大；而当机制砂含泥量大于6%时，随含泥量的增加，混凝土的含气量及其经时损失率呈减小趋势；当机制砂含泥量小于4%时，随含泥量的增加，混凝土气泡间距系数逐渐减小，而混凝土硬化外观气孔数量逐渐增多；当机制砂含泥量大于4%时，随含泥量的增加，混凝土气泡间距系数逐渐增大，而混凝土硬化外观气孔数量逐渐减少。
关键词：含泥量；含气量；气泡间距系数；机制砂；混凝土
中图分类号：TU528.041 文献标识码：A 文章编号：1001-702X（2022）06-0108-04
Research on the influence of mud content of machine-made sand on concrete bubble parameters
FANG Xiaoli1，LI Wei2，WANG Anshu2，ZHUANG Zhijie2，DENG Lin2
（1.Yunnan Zhongheng Group. Yunnan Hengda Concrete Co. Ltd.，Kunming 650032，China；
2.Jiangsu Subote New Materials Limited Company，Nanjing 210008，China）
Abstract：By controlling the mud content of manufactured sand to 0~10%，the effects of the mud content of manufactured sand on the air content of ready-mixed concrete，the loss rate of air content over time，the bubble spacing coefficient and the distribution of pores on the hardened appearance were studied by using the concrete air content meter and the bubble parameter analysis system. The results show that：when the mud content of the manufactured sand is lower than 6%，the air content of concrete and the loss rate over time increase with the increase of the mud content of the sand；when the mud content is higher than 6%，the air content and loss rate of concrete show a downward trend with the increase of the mud content of the sand. When the mud content of manufactured sand is lower than 4%，the concrete bubble spacing coefficient decreases with the increase of mud content of sand，and the number of pores on the appearance of hardened concrete increases with the increase of mud content. When the mud content is higher than 4%，the bubble spacing coefficient of the concrete increases with the increase of the mud content of the sand，and the number of pores on the hardened appearance of concrete decreases with the increase of mud content.
Key words：mud content，air content，bubble spacing coefficient，manufactured sand，concrete