高性能混凝土自收缩测试方法探讨

Study on the Measurement of Autogenous Shrinkage of High Performance Concrete

在查阅国内外相关文献资料的基础上,从定义上明确了自收缩、自干燥收缩及化学减缩的区别与联系;设计制造出混凝土自收缩测试系统,该系统分别采用立式测量和水平测量测试混凝土结构形成不同阶段的收缩值,测试从混凝土成型时开始,测试结果与定义相符,且具有很好的重现性.

Based on the review of the relative literatures, the discrimination as well as the relation of the definitions between the autogenous shrinkage, self-desiccation shrinkage and chemical shrinkage of the concrete were discussed from the point of view of their definitions. An automatic autogenous shrinkage measuring system was developed, which adopted the combination of non-contact sensor as well as micrometer and perpendicular as well as horizontal measurement in the different stages of the structure evolution of concrete. The measurement can be start after casting. The measured results are consistent with the definition and the repeated measurements agree very well.