短龄期旧混凝土与新混凝土劈裂强度的研究  

Experimental study on splitting strength of new-to-old concrete in short age

作　　者：张明杰[1] 楚珑晟[1] 赵杰夫 刘鑫卉 ZHANG Minjie;CHU Longsheng;ZHAO Jiefu;LIU Xinhui(School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《四川建筑科学研究》2018年第5期106-110,共5页Sichuan Building Science

摘　　要：通过对新旧混凝土结合试样劈裂强度的研究,探究了不同界面剂、界面处理方法和不同龄期旧混凝土对新旧混凝土结合试样劈裂强度的影响。结果表明,良好的界面处理能够提高新旧混凝土的粘结力,井槽法效果优于人工凿毛法;界面剂的使用提高了新旧混凝土的劈裂强度,膨胀水泥浆提升效果优于水泥净浆和结晶水泥浆;随旧混凝土龄期的增长,不同成型工艺制成的新旧混凝土试样的劈裂强度均降低;在强度分析的基础上拟合出劈裂强度随不同龄期旧混凝土抗压强度变化的公式。Through the research on splitting strength of new-to-old concrete,influences of interface agents,interface treatment methods and old concrete of different ages on splitting strength of new-to-old concrete were explored.The results indicate that good interface treatment can improve bond force of new-to-old concrete,and the effect of transverse-groove is better than artificial chiseling.Interfacial agent improves splitting strength of new-to-old concrete,and expanded cement slurry is better than cement slurry and osmotic crystallization cement slurry.With the increase of old concrete age,splitting strength are reduced.Based on splitting strength analysis,the formula of splitting strength and compressive strength of old concrete at different ages was fitted.

关 键 词：新旧混凝土 劈裂强度 界面处理 界面剂 旧混凝土龄期 

分 类 号：TU528[建筑科学—建筑技术科学]