海洋环境下混凝土相对湿度响应

发布时间：2018-08-07 17:24

【摘要】：混凝土放置于青岛室内大气环境、海洋大气区、浪溅区环境以及模拟干燥的恒温恒湿、45°C烘干环境,模拟湿润的毛细吸水环境,测试混凝土深度为10~40 mm的相对湿度演变。研究结果表明:饱和混凝土相对湿度受环境湿度影响先稳定、再快速下降然后缓慢下降,包括水气饱和期和相对湿度减小期。混凝土内部相对湿度对环境湿度响应时间上存在滞后性,离表层越近响应速度越快,环境湿度越小,影响深度越大。室内大气环境、海洋大气区、海洋浪溅区、恒温恒湿及烘干环境下养护42 d,混凝土10~20 mm深度的相对湿度分别为90%~92%,85%~90%,90%~95%,89%~92%和57%~58%。干燥过程中混凝土相对湿度与时间变化关系受水分向外扩散过程控制;混凝土表观湿度扩散系数随深度增加而线性增加,表面层平均相对湿度与深度的关系符合对数函数关系。在湿润过程中,表面层相对湿度演变可用毛细传输系数公式进行分析,内部相对湿度演变是传输与扩散共同作用所致。
[Abstract]:The concrete is placed in the indoor atmosphere of Qingdao, the marine air area, the wave splash area and the simulated drying environment with constant temperature and humidity of 45 掳C, and the wet capillary absorption environment is simulated. The relative humidity evolution of the concrete with a depth of 10 ~ 40 mm is tested. The results show that the relative humidity of saturated concrete is first stable under the influence of environmental humidity, then decreases rapidly and then slowly, including the water vapor saturation period and the relative humidity decreasing period. The response time of concrete relative humidity to environmental humidity is lag. The closer the concrete is to the surface, the faster the response speed is, and the smaller the environmental humidity is, the greater the influence depth is. Indoor atmospheric environment, ocean air area, ocean splash area, constant temperature, humidity and drying environment for 42 days, the relative humidity of 1020 mm depth of concrete is 90. 92% and 577.58% respectively. The relationship between the relative humidity and the time of concrete during drying is controlled by the process of water diffusion, the apparent humidity diffusion coefficient of concrete increases linearly with the depth, and the relationship between the average relative humidity and the depth of the surface layer accords with the logarithmic function. In the process of wetting, the evolution of relative humidity of surface layer can be analyzed by the formula of capillary transport coefficient, and the evolution of internal relative humidity is caused by the interaction of transport and diffusion.
【作者单位】：青岛理工大学土木学院;
【基金】：国家自然科学基金资助项目(51178230) 铁道部科技研究计划项目(2010G024) 山东省高校优秀科研创新团队基金(2012) 青岛市科技项目(13-1-4-176-jch,13-1-4-115-jch)~~
【分类号】：TU528.01

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