静水压下混凝土水分与氯离子渗透及其相关性研究

发布时间：2019-06-13 21:36

【摘要】：通过对3种混凝土在不同静水压力和持压时间下的压力渗透试验,研究了静水压力对混凝土中水分和氯离子渗透的影响及两者之间的关系。结果表明,压力条件下水灰比仍是影响混凝土渗水性能的重要参数,水灰比为0.5的混凝土渗水深度约为水灰比为0.4的1.3倍;双掺20%粉煤灰和矿粉显著提高混凝土的抗压力水渗能力,渗水深度约为普通混凝土的59.6%;活性混合材能够增强胶凝基体对氯离子的过滤和化学固化能力,即使存在外界压力作用,其抗氯离子渗透能力也大幅提高,渗透深度仅为未掺时的42.5%,优于其抗水渗效果;氯离子渗透滞后于水分渗透,两者并不同步,但数据统计存在较好的线性关系,利用混凝土抗压力水渗试验可间接评价其氯离子压力渗透性能。
[Abstract]:Based on the pressure penetration tests of three kinds of concrete under different hydrostatic pressure and holding time, the effect of hydrostatic pressure on moisture and chloride ion penetration in concrete and the relationship between them were studied. The results show that the water-cement ratio is still an important parameter affecting the seepage performance of concrete under pressure, and the seepage depth of concrete with water-cement ratio of 0.5 is 1.3 times of that of water-cement ratio of 0.4, and the anti-pressure seepage ability of concrete is significantly improved by adding 20% fly ash and mineral powder, and the seepage depth is about 59.6% of that of ordinary concrete. The active mixture can enhance the filtration and chemical curing ability of cementitious matrix to chloride ion. Even if there is external pressure, its anti-chloride ion penetration ability is greatly improved, and the penetration depth is only 42.5% of that when it is not mixed, which is better than its anti-seepage effect. The chloride ion penetration lags behind the water penetration, and the two are not synchronous, but there is a good linear relationship between the data statistics. The chloride ion pressure permeability performance can be indirectly evaluated by using the concrete pressure water infiltration test.
【作者单位】：青岛理工大学土木工程学院;卡尔斯鲁厄理工学院;青岛东盛建筑设计所;
【基金】：国家自然科学基金资助项目(51278260,51308316);国家自然科学基金重点国际合作项目(51420105015) 国家973项目(2015CB655100)
【分类号】：TU528.1

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