自生体积变形试验方法研究及应用

Study on experimental method for determining autogenous volume deformation and its application

提高混凝土的自生体积膨胀变形量补偿混凝土的温度收缩变形 ,对于混凝土抗裂很有意义。从混凝土的细观结构研究出发对混凝土自生体积变形的基准值问题进行了初步探讨。在对比和分析了国内外自生体积变形测定方法的基础上提出了一种更为合理的自生体积变形测定方法 :高精度位移传感器法。应用建立的试验方法探索了微膨胀碾压混凝土的自生体积变形 ,试验表明水泥生产中均匀外掺氧化镁碾压混凝土的自生体积收缩变形明显减小。

Increasing autogenous volume expansive deformation for compensating thermal shrinkage deformation of concrete may improve crack resistance. A study on the basic reference value of autogenous volume deformation is discussed according to the observation of microstructure. A more realistic method for determining autogenous volume deformation named high precision displacement transducer method is proposed. Study on autogenous volume deformation of micro expansive RCC (roller compacted concrete) by the new established method was made. Experimental results show that the autogenous volume shrinkage deformation of RCC can decrease obviously by adding homogeneously MgO into cement during cement production .