基于非饱和试件的混凝土水分传输评定  

Concrete moisture transport tests based on non-saturated specimens

作　　者：童慧芝[1] TONG Hui-zhi(Department of Construction Engineering, Zhejiang Tongji Vocational College of Science and Technology, Hangzhou311231, Chin)

机构地区：[1]浙江同济科技职业学院建筑工程系,杭州311231

出　　处：《西南师范大学学报（自然科学版）》2018年第5期121-126,共6页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：2015年度浙江省水利厅科技项目(编号RC1551);2013年度浙江省水利厅科技项目(RC1466)

摘　　要：混凝土是一种多孔材料,水或空气可自由渗入混凝土,降低了混凝土的耐久性.混凝土抗渗性能是耐久性问题主要影响因素之一,多数研究集中在饱水混凝土的渗透系数和氯离子扩散系数方面,实际上建筑工程多数处于非饱水状态,混凝土水不饱和状态也是影响抗渗性能的重要因素之一.多数研究对试件进行切片研究,费力费时,受试验方式方法环境等影响大,也不能做到实时、全寿命监测.该文通过施加水压,从混凝土表面渗入压力水到钢筋骨架附近,研究了非饱和状态下混凝土内部的水分传输监测装置,水分迁移评价方法.研究结果表明,45%初始饱和度以下混凝土可以采用电阻法进行全寿命监测.低水平荷载下,既定深度处水分到达时点与荷载水平成反比.Concrete is a porous material, water or air can corrodeconcrete freely that reduced the durability of concrete. The permeability,one of the most important influence factors of concrete durability, was studied based on water saturated state mostly by water coefficient and chloride diffusion coefficient according extensive literature. Actually, most constructions are serving under unsaturated state, the unsaturation should be considered asone important factor that affects the permeability of concrete. And most tests are implemented by slicing the concrete specimens, it costs huge time and procedures,and the results are influenced by the condition and the process easily, neither with realtime and whole service life monitoring. This paper discussed the water transportation evaluation system on unsaturated concrete by self-designed permeability monitoring system under water pressure with 1MPa.The result shows that it can be monitored under 45% relative saturation through whole service life. The water arrival time points are linearly dependent on the low level load.

关 键 词：非饱和试件 混凝土 抗渗性能评价 水分传输 电阻法 

分 类 号：TU528.31[建筑科学—建筑技术科学]