不同养生方法下早龄期混凝土水分迁移规律

发布时间：2018-01-16 20:25

本文关键词：不同养生方法下早龄期混凝土水分迁移规律　出处：《中国公路学报》2015年03期 　论文类型：期刊论文

【摘要】：为了研究早龄期混凝土在养生条件下的湿度发展规律,采用湿度传感器对早龄期混凝土内部的相对湿度(RH)进行了测试,分析了3个水灰比试件在3种养生方式下的早龄期混凝土水分迁移规律,建立了考虑养生因子的早龄期混凝土在外部干燥条件下的一维水分迁移模型,并以试验数据为基础对模型的有效性进行了验证。研究结果表明:水灰比对混凝土自干燥效应的影响较大,水灰比越小,自干燥程度越大;空气养生下混凝土内部的湿度降低速率大于养护剂和水养生下的降低速率;同时考虑自干燥和外部干燥效应的混凝土的湿度变化对养生方式较为敏感;在水分迁移模型的狄利克雷边界条件中引入养生因子的概念能较好地描述养生条件下早龄期混凝土的水分迁移规律。
[Abstract]:In order to study the law of humidity development of early age concrete under health condition, the relative humidity (RH) of early age concrete was measured by humidity sensor. In this paper, the water migration law of the early age concrete of three water-cement ratio specimens under three different ways of curing was analyzed, and the one-dimensional water migration model of the early age concrete considering the health factors was established under the condition of external drying. Based on the experimental data, the validity of the model is verified. The results show that the water-cement ratio has a greater effect on the self-drying effect of concrete, and the smaller the water-cement ratio, the greater the self-drying degree. The decreasing rate of humidity in concrete under air curing condition is higher than that under curing agent and water curing condition. At the same time, the moisture change of concrete considering self-drying and external drying effect is more sensitive to the way of health preservation. Introducing the concept of health factor into the Delikley boundary condition of water transfer model can better describe the water migration law of early age concrete under the condition of health preservation.
【作者单位】：同济大学道路与交通工程教育部重点实验室;山西省交通科学研究院;
【基金】：国家自然科学基金项目(51308329) 山西省青年科技研究基金项目(2013021028-2) 山西省自然科学基金项目(2013011027-1) 山西省交通建设科技项目(2013-1-10,2013-1-11)
【分类号】：U416.216
【正文快照】： 山西省自然科学基金项目(2013011027-1);山西省交通建设科技项目(2013-1-10,2013-1-11)0引言中国水泥混凝土路面设计方法中,路面板的厚度一直以其抗弯拉应力达到极限强度,路面板产生疲劳开裂作为破坏标准进行设计。美国力学-经验法(MEPDG)水泥混凝土路面设计方法中,路面板的应

【参考文献】