摘   要：为选出误差较小且适应性较强的测定掺加粉煤灰的硬化砂浆中水泥含量的方法，成型了不同粉煤灰掺量的砂浆试样，标准养护到不同龄期后，分别利用CaO法、葡萄糖酸钠溶液溶解法和可溶性SiO2法测定其中的水泥含量。试验结果表明，可溶性SiO2法的误差最小且适应性最强。采用该方法后，对于粉煤灰掺量不大于20%、龄期不超过180d的砂浆，以及粉煤灰掺量不大于15%、龄期不超过360d的砂浆，水泥含量测定结果的相对误差绝对值都在5%以内。

 Abstract：In order to get the analysis method that has the least error and the strongest adaptability of cement content in hardened mortars with fly ash, different samples with varied content of fly ash were prepared. After the mortar samples were cured for different ages in a standard environment, the cement content of different samples was investigated by CaO method, Sodium gluconate solution method, and soluble SiO2 method. The ideal measurements is soluble SiO2 method. By using the method, the relative deviation absolute value of cement content of hardened mortars with no more than 180d ages and 20 percent fly ash content is set within 5%, and the hardened mortars with no more than 360d ages and 15 percent fly ash content have the same result.