早强剂对水泥稳定材料抗冻性能的影响

Influence of Early Strength Agent on Frost Resistance Performance of Cement Stabilized Material

为了研究早强剂对水泥稳定碎石路用材料的抗冻性能影响,采用依托工程设计比例掺入5%水泥,再分别用0%,8%,10%,12%,14%和16%的早强剂替换水泥掺入碎石中制作各种冻融试验试件。通过试验分析了早强水泥稳定碎石材料的吸水率变化趋势、多次冻融循环后的质量损失率以及冻融前后的无侧限抗压强度变化,进而计算出材料的抗冻系数。试验结果表明:早强剂能够降低材料的吸水率和质量损失率,提高其冻融前后无侧限抗压强度及抗冻系数;抗冻性系数随着早强剂掺量的增加而增大。

In order to explore the influence of early strength agent on the frost resistance performance of cement stabilized macadam material used in road engineering, 5 % cement is mixed into the cement stabilized macadam mixture based on the engineering design ratio, then, the cement is replaced with 0% , 8% , 10% , 12% , 14% and 16% dosages of early strength agent to make all the freeze-thaw test specimens. The change trend of water absorption rate , the mass loss rate after several times of freezing-thawing and the change of unconfined compressive strength before and after freeze-thaw cycles are analyzed based on the test data. The frost-resistance coefficients of the cement stabilized macadam material with different early strength agent dosages are calculated. The experimental result shows that （1） the early strength agent can reduce the water absorption rate and the mass loss rate of the material, （2） improve its unconfined compressive strength and frost resistance coefficient before and after freezing-thawing; （3） the frost resistance coefficient increases as the early strength agent dosage increases.