利用火力发电厂的干排原状粉煤或磨细粉煤灰作混凝土的掺和料是节约水泥的一项措施。本文在调研的基础上,对粉煤灰进行了修筑路段试验。得出:(1)用20％以内的替换率配合而成的粉煤灰混凝土28天抗折强度、表面硬度、抗压性能等均满足设计要求。为提高其早期强度,可掺加具有早强性质的外加剂和采用真空吸水工艺。(2)粉煤灰混凝土的抗 The use of raw coal-fired power plants or pulverized fly ash as concrete admixture is a measure to save cement. On the basis of investigation, this paper carried out road tests on fly ash. It is concluded that: (1) The fly-ash concrete with 28% replacement rate within 20% meets the design requirements for 28 days flexural strength, surface hardness and compressive strength. In order to improve its early strength, admixtures with early strength properties and the use of vacuum suction can be used. (2) fly ash concrete resistance