掺超细活性二氧化硅混凝土的自生收缩实验研究  

Experimental Study of Concrete Autogenous Shrinkage with Superfine Active Silica

作　　者：郭保林[1] 孙日双 郑斐[3] 

机构地区：[1]山东省交通科学研究所,山东济南250031 [2]山东省交通规划设计院,山东济南250031 [3]长安大学公路学院,陕西西安710064

出　　处：《商品混凝土》2007年第1期24-28,74,共6页Ready-Mixed Concrete

摘　　要：采用安明喆等人提出的测试方法对以纳米二氧化硅和硅灰为代表的超细活性二氧化硅对混凝土自生收缩的影响进行深入研究。实验结果表明:掺入纳米二氧化硅会提高混凝土的自生收缩应变,在初凝至1天龄期之间尤为明显;水胶比越低,混凝土的自生收缩越大;引气剂能够明显降低混凝土在各个龄期时的自生收缩应变。The effects of superfine active silica(Nano SiO2,and Silica Fume)on concrete autogeneous shrinkage are experimented with the testing method proposed by An mZ etc..The experimental results strongly suggest that the addition of Nano SiO2 can increase the autogeneous shrinkage of concrete,especially in the early age(fromthe initial setting to 1 day age);the lower of the water to binder ratio the larger of concrete autogeneous shrinkage,and autogenous shrinkage of concrete can be reduced with the addition of air entraining agent.

关 键 词：自生收缩 高强混凝土 纳米二氧化硅 硅灰 

分 类 号：TU528[建筑科学—建筑技术科学]