摘要：为明确二灰水泥稳定碎石在道路基层中的使用性能,采用室内实验测试不同粉煤灰掺量、不同水泥剂量下稳定碎石基层材料的无侧限抗压强度、劈裂强度、抗压回弹模量、失水率和干缩应变。结果表明:当采用二灰水泥稳定碎石铺筑二级和二级以下公路基层时,结合料中石灰与粉煤灰的质量比宜取为1:3.0左右即粉煤灰的质量分数不大于75%;从经济合理的角度考虑,应将水泥的质量分数控制在2.5%以下;为避免二灰水泥稳定碎石基层产生较大的失水率和干缩量,在实际应用中必须严格控制成型初期的保湿养生条件,以防过早产生大量干缩裂缝。

关键词：石灰；粉煤灰；路面基层；力学性能；失水率；干缩应变

Abstract：In order to definite the service performance of roadbase with fly ash cement stabilized crushed stone, the indoor tests were implemented to test the unconfined compressive strength,compressive resilient modulus, splitting strength, filtration rate and dry shrinkage strain of stabilized crushed stone base materials with different fly ash content and cement dosage. The results show that when using the stabilized crushed stone base with fly ash to pave the base of secondary and under secondary roads, its dosage should not exceed 75% of the total. From the angle of economic rationality,cement dose can be controlled below 2.5%. To avoid the higher filtration rate and dry shrinkage strain of fly ash cement stabilized crushed stone base, the moisturizing regimen must be strictly controlled in practical application at the beginning of the formation to prevent early dry shrinkage cracks generation.

Keywords: lime；fly ash；roadbase；mechanical property；filtration rate；dry shrinkage strain