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研究了矿渣粉、高钙粉煤灰、脱硫石膏以及Na2SO4对净浆水泥石中可溶离子浓度和pH值的影响,水泥石中可溶出的Mg、Si、Al等各离子浓度主要与原材料中的该离子含量有关,Na2SO4使水泥-矿粉-高钙灰系统中的Al离子浓度降低并使Mg、Si离子浓度提高;在水泥-矿粉-高钙灰材料体系中,硬化体内部pH值主要受可溶出的Ca离子浓度控制;外界引入的Na离子比可溶Ca离子浓度更明显地影响pH值;Mg、Si、Al等离子的浓度变化对pH值基本无影响;采用50%的矿渣粉和高钙灰替代水泥使pH值略有降低,粉煤灰降低pH值的作用比矿渣粉更明显;采用脱硫石膏使S和Ca离子浓度提高,但使pH值降低;各pH值均高于钢筋开始脱钝的最低碱度值。
The effects of slag powder, high calcium fly ash, gypsum and Na2SO4 on soluble ion concentration and pH value in cement paste were studied. The ion concentrations of Mg, Si, Of the ion content, Na2SO4 cement - slag mineral - high calcium ash system to reduce the concentration of Al ions and the Mg, Si ion concentration increased; cement - slag powder - high calcium ash material system, the hardened body internal pH Which is mainly controlled by the concentration of soluble Ca ion. The concentration of Na ion introduced by the outside world is more obvious than that of soluble Ca ion. The concentration of Mg, Si and Al ions has no effect on the pH value. 50% slag powder And the substitution of high-calcium ash cement slightly lower the pH value, fly ash lower pH value than the slag powder more obvious; the use of desulfurized gypsum S and Ca ion concentration increased, but the pH value decreased; each pH value higher than The minimum alkalinity for rebar to begin blunting.