养护温度对水泥沥青砂浆强度发展的影响  

Effect of Curing Temperature on Strength Development of Cement-Asphalt Mortars

作　　者：刘永亮[1,2] 孔祥明[1] 张敬义 张艳荣[1] 阎培渝[1] 黄婉利 

机构地区：[1]清华大学土木工程系,北京100084 [2]贝尔法斯特女王大学规划、建筑和土木学院,贝尔法斯特BT9SAG [3]中石化上海沥青销售公司,上海200050

出　　处：《建筑材料学报》2012年第2期211-217,231,共8页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50802050);“十一五”国家科技支撑计划项目(2006BAJ05B03);铁道部科技研究计划重大课题(2008G031-18)

摘　　要：试验研究了0,25,60℃这3种养护温度下不同沥青含量的水泥沥青砂浆(CAM)在3～120d龄期内的力学强度发展规律.结果表明:高温养护不利于低沥青含量CAM的力学强度发展,但有利于高沥青含量CAM的抗压强度发展;低温养护不利于任何类型CAM的强度发展;养护环境温度主要影响水泥的水化反应和沥青的破乳成膜过程,且对前者的影响大于后者.对不同类型CAM中后期现场养护方法提出了一些建议.Development of mechanical strengths of cement asphalt mortars（CAMs） with varied asphalt to cement ratio（mA/mc） at 3 different curing temperatures were investigated during the age of 3 -120 d. Standard prisms were prepared and maintained at the temperature of 0,25, 60℃ after 3 d. Flexural strengths and compressive strengths of different CAMs were tested at increasing ages and the correlation between mechanical strength and age under different curing temperatures was obtained. The results indicate that high temperature curing is disadvantageous for the development of mechanical strength of CAMs with rnn/mc〈0. 6, however, the compressive strength development of CAMs with mA/mc〉0. 6 can be promoted. The adverse effect of low temperature curing on strengths at any age was observed for any kind of CAMs. The de-emulsification of asphalt emulsion is less influenced than cement hydration by the curing temperature. Last but not the least, in situ curing methods for different CAMs at mid or long age are recommended.

关 键 词：水泥沥青砂浆 养护温度 抗压强度 抗折强度 水泥水化 破乳 

分 类 号：TU528.42[建筑科学—建筑技术科学]