水泥粉煤灰稳定碎石强度增长特性  

Strength growth characteristics of cement and fly-ash stabilized crushed-stones

作　　者：徐鸥明[1] 韩森[2] 孙薇 

机构地区：[1]长安大学材料科学与工程学院,陕西西安710061 [2]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [3]北京中交建设工程招标有限公司,北京100029

出　　处：《广西大学学报（自然科学版）》2009年第4期474-478,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：国家西部交通科技项目(200731822301-8);陕西省交通科技项目(05-05K)

摘　　要：为了评价水泥粉煤灰稳定碎石强度增长特性，通过不同龄期无侧限抗压强度试验和劈裂试验，研究了不同粉煤灰掺量下水泥粉煤灰稳定碎石强度变化情况。结果表明：粉煤灰的掺人，对水泥稳定碎石早期抗压强度和劈裂强度都有影响，掺量越大早期强度越低；掺加粉煤灰对长期强度有利，就提高长期强度而言，粉煤灰最佳掺量约为10％；由于7d抗压强度不足以反映掺粉煤灰的水泥稳定碎石强度特性，建议采用7～90d强度增长率作为评价其强度潜能，在实际工程中应适当降低其7d强度要求。In order to evaluate the strength growth characteristics of cement and fly-ash stabilized crushed stones, the strength variety of different fly-ash mixing proportion is studied by unconfined compressive strength test and splitting test for different ages. The results show that incorporation of fly-ash would reduce the compressive strength and splitting strength of cement-stabilized crushed stones in early stage. And the greater the incorporation, the lower the early strength is. Mixing with fly-ash would benefit the long-term strength, and the optimum mix content of fly-ash is about 10%. In view of compressive strength for 7 day ages could not adequately reflect the strength characteristics, the strength growth rate between 7 day ages and 90 day ages is suggested as the evaluation index of the strength potential of stabilized crushed stones. And the strength requirement of 7 day ages should be reduced properly in project practice.

关 键 词：道路工程 水泥稳定碎石 粉煤灰 

分 类 号：U416.2[交通运输工程—道路与铁道工程] TU502.6[建筑科学—建筑技术科学]