掺合料对高性能混凝土早期自收缩的影响

Effect of mineral admixture on autogenous shrinkage of high performance concrete at early age

本文采用自制的混凝土自收缩测定仪测定了高性能混凝土早期的自收缩 ,研究了硅灰、磨细矿渣、磨细粉煤灰三种掺合料对高性能混凝土自收缩的影响。研究结果表明 :硅灰和磨细矿渣增大了高性能混凝土 3d前的自收缩值 ,而磨细粉煤灰降低了高性能混凝土

Autogenous shrinkage of high performance concrete(HPC)at early age is measured by self made concrete autogenous retractometer in this paper.The effect of mineral admixdtures on concrete autogenous shrinkage at early age is studied,include silica fume,ground slag and ground fly ash.The result shows that silica fume and ground slag can improve the autogenous shrinkage of HPC before 3 days,but ground fly ash can reduce it.