水利学报2017，Vol.48Issue(2)：193-202,10.DOI:10.13243/j.cnki.slxb.20160539
水压力环境中混凝土的含水量及其对力学性能的影响
Water content in concrete under water pressure environment and the effect on its mechanical properties
摘要
Abstract
This paper presents a study on the water content characteristic and the influence of pore water on mechanical properties when concrete under water pressure environment.The test was carried out to obtain curves of water content for concrete under different water pressure,and influence of water pressure variation on water content and distribution of pore water was discussed based on the mesoscopical pipe-pore network model.Furthermore,mechanism for effect of water content and scale of pore water on the static and dynamic mechanical properties of concrete was analyzed.The results show that water content of concrete increases with increasing water pressure,while water pressure exceeds a certain value,the increase of water content is insignificant;under high water pressure,the pore space in concrete is less for water to flow and a portion of pore water is on smaller scale,which resulting in greater viscous stress and excess pore water pressure when concrete under the dynamic loading,and these can lead to the nonlinear increase for the strength of concrete as strain rate rises.However,the strength of concrete is not affected by water pressure.In conclusion,the mechanical properties of concrete are not only related with water content and loading rate,and but also closely related to the scale of pore water.关键词
混凝土/水压力环境/含水量/孔隙模型/力学性能Key words
concrete/water pressure environment/water content/pore model/mechanical properties分类
建筑与水利引用本文复制引用
王乾峰,刘云贺,彭刚..水压力环境中混凝土的含水量及其对力学性能的影响[J].水利学报,2017,48(2):193-202,10.基金项目
国家自然科学基金项目(51279092) （51279092）
水利部公益性行业科研专项(201501034-03) （201501034-03）
