掺加混合材的水泥石自收缩特性研究

Effect of Additives on the Autogenous Shrinkage of Cement Paste

研究了不同种类的混合材对水泥石自收缩的影响 ,并试图通过复合粉煤灰或石灰石粉来降低掺加超细矿渣的水泥石自收缩 ;应用了交流阻抗谱技术来研究自收缩现象 .研究结果表明 ,水泥石自收缩会随超细矿渣细度的增加而增加 ;掺加硅灰会增大水泥石的自收缩 ;石灰石和粉煤灰能够有效地降低自收缩 ;大量掺加石灰石粉或粉煤灰能够降低复合了超细矿渣的水泥石自收缩 .水泥石的交流阻抗值与自收缩率之间有良好的对应关系 ,自收缩率增加 ,阻抗值增大 .

Some efforts were done to reduce the autogenous shrinkage of cement paste by adding the superfine additive of limestone powder or fly ash. AC impedance techniques were used to study the autogenous shrinkage. The test results show that autogenous shrinkage increases along with the fineness increase of superfine slag. Silica fume also can increase the autogenous shrinkage. Largely mixing limestone powder or fly ash in cement paste with superfine slag can reduce autogenous shrinkage. It may be laid down as a rule that, as the autogenous shrinkage increases, the impedance becomes larger.