水泥粉煤灰稳定碎石路面的水泥与粉煤灰比例

Proportion of cement to fly-ash in cement-fly-ash stabilized crushed-stones pavement

为了研究水泥粉煤灰稳定碎石混合料中水泥与粉煤灰的最优比例,通过集料含量和级配不变,只改变水泥与粉煤灰比例的方法,研究了不同配合比混合料强度指标随龄期的变化规律。结果表明:混合料不同龄期的强度更多地取决于水泥剂量,而非水泥与粉煤灰比例;180 d龄期与28 d龄期的强度比值R180/R28能够反映水泥与粉煤灰比例的优劣;R180/R28随水泥/粉煤灰变化曲线的拐点对应水泥与粉煤灰的最优比例。

In order to give the best proportion of cement to fly-ash for coustructing cement- fly-ash stabilized crushed-stones pavement, through varying the proportion of cement to fly-ash while maintaining aggregate percentage and gradation, the variation law of mixture strength index with age is studied by experiment. The results show that the cement percentage determines mixture＇s strength; the strength ratio value（R180/R28） can indicate the proportion＇s value; the special point of variation curve of R18o/R28 to cement/fly ash indicate the best proportion of cement to fly-ash. 7 tabs, 2 figs, 9 refs.