超量取代法的优点在混凝土生产中，应用粉煤灰时采用何种方法既提高质量，又降低成本，这是应用粉煤灰单位最关心的问题。从我们预制构件生产中分别采用外加法、等量取代法和超量取代法的实践来看，超量取代法效果最佳。１生产应用情况原材料：牡丹江４２５＃水泥，比重３... Advantages of over-substitution method In concrete production, the application of fly ash in what way to improve both the quality and reduce costs, which is the most concerned about the application of fly ash units. From the production of precast components, respectively, with the addition method, the equivalent replacement method and excess replacement method of practice, the excess replacement method best. 1 Production and application of raw materials: Mudanjiang 425 # cement, the proportion of 3 ...