水泥稳定碎石排水基层胶浆合理稠度的评价方法

Evaluation Method of Reasonable Cement Slurry Consistency of Cement Treated Crushed Stone Permeable Base

为了定量评价水泥稳定碎石排水基层材料中水泥胶浆稠度的合理性,设计了针对水泥稳定碎石排水基层材料的析漏试验。以析漏质量为评价指标,根据对不同胶浆稠度的水泥稳定碎石材料的析漏试验确定了试验的标准析漏时间为60 s。以7 d无侧限抗压强度大于5 MPa和空隙差小于5%作为力学强度和空隙均匀性的评价标准,通过建立析漏质量与7d无侧限抗压强度和空隙差的关系,确定满足力学强度和空隙均匀性要求的水泥胶浆的析漏质量小于150 g。为检验方法的合理性,测试了采用该方法所设计混合料的空隙率和不同龄期的抗压强度、劈裂强度和回弹模量。结果表明,采用该方法设计的混合料既具有较大且均匀的空隙率,在不同的龄期又具有较高的抗压强度、劈裂强度和回弹模量,满足力学性能要求。

To quantitatively evaluate the reasonability of cement slurry consistency for cement treated crushed stone permeable base,a drainage experiment for cement treated crushed stone permeable base materials was developed.Drainage weight was taken as the evaluation index,and the standard drainage time was determined as 60 s by testing the abovementioned materials with different cement slurry consistencies.The evaluation criteria of mechanical strength and void equality were taken as 7 d unconfined compressive strength larger than 5 MPa and voids difference smaller than 5%.According to relation of drainage weight with 7 d unconfined compressive strength and voids difference,it was determined that the drainage weight should be smaller than 150 g to meet the requirement of mechanical strength and voids equality.The parameters such as voids,compressive strength,cleavage strength and resilient modulus at different ages of the mixtures designed by the method were tested.The results show that the materials designed by the method have large and equal voids.The compressive strength,cleavage strength and resilient modulus at different ages are high enough to meet the requirement of mechanical property.