混凝土防冻剂液灰比研究

从冻点测定结果导出了混凝土防冻剂溶液相图中的冰─液平衡线及其数学表达式．提出了“液灰化”概念及公式以估算掺防冻剂混凝土负温度下的液相水量．以此为基础的研究可以得到如下的防冻剂作用机理：某负温度下掺防冻剂混凝土存在液相，其中防冻剂浓度恒定，混凝土中液灰比只取决于防冻剂的残余量，因此水泥水化所耗的液相水由冰融化得以补足，水泥中液相水不会消失，故水泥水化可不断进行．掺一些防冻剂混凝土存在最佳液灰比及最佳防冻剂掺量．

A Research on Liquid Water-Cement Ratio of Concrete Antifreezer

The ice-liquid curve in phase diagram of the antifreezer solution and its formula are deduced from measured value of freezing point. A new concept called "liquid water-cement ratio" and its formula are advanced, which can be used to evaluate liquid water amount in the concrete mixed with antifreezer at negative temperature. Based on this theory, mechanism of antifreezer is explained as follow:at a pointed negative temperature, the concentration of antifreezer in liquid keeps constant, the liquid water-cement ratio in concrete is only determined by the amount of remainder of antifreezer; therefore, the liquid water consumed in cement hydration is compensated by thawed ice and the liquid water will never disappear, the cement hydration will continue on. the optimum values of liquid water-cement ratio and the antifreezer dosage exist in the concrete mixed with some antifreezer at negative temperature.