水泥稳定类路面基层材料的延迟成型

研制一种超效缓凝剂SRA，当掺量为0．045％时可将终凝时间延长到10h；综合考察SRA对水稳粒料的强度和对水泥凝结时间的影响确定SRA的最佳掺量在0．05％～0．06％，用SRA可大大延长延迟成型时间，可把延迟成型时间延长到8～9h。在延迟成型时间较长时，SRA起到的缓凝作用比木钙更明显。在模拟施工条件下延迟4h、6h后的SRA改性水泥稳定粒料强度损失明显小于同种混合料在延迟成型条件下的强度损失。

Research on Forming Retarded Time of Cement Stabilized Pavement Base Materials

A new type of super retarder named SRA is introduced in this paper. When the dosage of it is 0.045%, the final setting time can be retarded for 10 h.The suitable dosage of SRA is about 0.05 to 0.06%, and the foring time of cement stabilized granular soils can be delayed for 8 to 9 h by the SRA.The SRA has better effect than lignosulphonate calcium as the forming retarded time is longer. Under the SRA modified cement stabilized granular soil samples prepared in the model construction test, after the setting time is delayed for 4 h or 6 h, the loss of strength and maximum density is much lower than samples without SRA.