高性能混凝土的强度与渗透性的关系

一般认为，混凝土的强度越高，其渗透性越低，以及耐久性越好。通过掺与不掺矿渣或粉煤灰高性能混凝土的试验结果表明，纯水泥混凝土的强度与渗透性之间有很好的相关性，其相关系数为０．９７６７；矿渣混凝土及粉煤灰混凝土的强度与渗透性之间相关性较差，相关系数分别为０．８０８１和０．８４１９；所有混凝土的强度与渗透性之间，相关性更差，相关系数为０．６５６６。可见，除非用于纯水泥混凝土之间的相对比较，高性能混凝土的强度通常不能反映其渗透性

CORRELATION BETWEEN STRENGTH AND PERMEABILITY OF CONCRETE

It is often believed that the higher the strength of concrete, the lower of its permeability, and the better of its durability. Through experiments of high performance concrete with or without slag or fly ash, it shows that the correlation between strength and permeability for pure cement concrete is good,with correlation coefficient of 0.9767; and that for slag concrete or fly ash concrete is not as good as that for pure cement concrete, with correlation coefficient 0. 8081 or 0.8419; and that for all concrete is poor, correlation coefficient 0.6566. It seems herein that except for relative comparison among pure cement concrete, the strength of high performance concrete generally can not reflect its permeability.