内部养生环境下路面水泥混凝土的干燥收缩  

Dry Shrinkage of Pavement Cement Concrete with Internal Curing

作　　者：周胜波 禤炜安 姚新宇 张树芬 叶超强 柳梦 ZHOU Sheng-bo XUAN Wei-an YAO Xin-yu ZHANG Shu-fen YE Chao-qiang LIU Meng(Guangxi Key Laboratory for Road Material and Structure, Nanning 530007 ,China Guangxi Transport Research Institute, Nanning 530007, China Baise Highway Operation Co. Ltd. , Guangxi Communications Investment Group Co. Ltd. , Baise 533000, China)

机构地区：[1]广西道路材料与结构重点实验室,南宁市530007 [2]广西交通科学研究院,南宁市530007 [3]广西交通投资集团百色高速公路运营有限公司,百色市533000

出　　处：《公路》2017年第7期20-24,共5页Highway

基　　金：广西科技计划项目技术创新引导专项;桂科AC16380109;广西道路结构与材料重点实验室开放课题;项目编号2016gxjgclkf-004

摘　　要：内养生是控制路面水泥混凝土收缩的一项重要新技术,通过研究内养生材料掺量和额外加入水量对混凝土干缩的影响,指出吸水树脂可以明显地降低混凝土后期干缩率。固定额外加入水量时,0.2%树脂掺量的内养生路面水泥混凝土干缩率降低最大为78.8%;而固定树脂掺量时,10倍树脂掺量外部加入水量的路面水泥混凝土在整个水化期间的干缩率降低效果优异。在路面混凝土中使用吸水树脂进行内养生,建议掺量为0.2%,额外加入水量为10倍树脂掺量。Internal curing method is a new important technology to control shrinkage of pavement cement concrete. Based on the influence of water absorbing polymer content and extra additional water on drying shrinkage of concrete, it is pointed out that the polymer can significantly lower shrinkage of concrete in the late hydration. When fix the extra water volume, the shrinkage rate of cement concrete containing 0.2% polymer dosage is lowest, and the maximum decrease value is 78.8% . The drying shrinkage decreasing effect of concrete with 10 times extra additional water content as much as polymer dosage is optimal during the whole hydration when fix the Polymer content. When the polymer being used in the pavement concrete for internal curing materials, the recommended polymer dosage is 0.2 %, and extra additional water is 10 times of the polymer content.

关 键 词：道路工程 内养生 干缩 路面水泥混凝土 

分 类 号：U416.216[交通运输工程—道路与铁道工程]