配合比和龄期对塑性混凝土强度、pH值和电导率的影响

Effect of Mix Proportion and Age on Strength,pH Value,Electrical Conductivity of Plastic Concrete

通过室内试验,研究了配合比和养护龄期对塑性混凝土强度的影响,并测定了相应条件下塑性混凝土的pH值和电导率,明确了水泥掺量和龄期对pH值和电导率的影响规律,进一步发现塑性混凝土pH值、电导率与强度之间存在定量关系.结果表明:随着水泥掺量的增加,塑性混凝土强度、pH值和电导率均增大;随着龄期的增加,塑性混凝土强度增大,pH值和电导率均先增大后减小;不同水泥掺量和龄期下,塑性混凝土pH值可划分为3个阶段:11.60~12.20、12.20~12.35和12.35~12.80,各阶段下电导率与强度均呈幂函数关系.

From indoor experiments,the effects of mix proportion and curing age on unconfined compressive strength of plastic concrete were studied.The pH value and electrical conductivity were measured under the corresponding cement content and curing age.The quantitative relationship between pH value,electrical conductivity and strength of plastic concrete was established.Results show that with the increase of cement content,the strength,pH value and electrical conductivity of plastic concrete increase.With the increase of curing age,the strength of plastic concrete increases,while pH value and electrical conductivity firstly increase and then decrease.Under different cement contents and curing ages,pH value of plastic concrete shows three stages:11.60-12.20,12.20-12.35,12.35-12.80,and there is a good power function relationship between electrical conductivity and strength at each stage of pH value.