| 张鹏,赵彦迪,赵铁军,李绍纯.静水压下混凝土水分与氯离子渗透及其相关性研究[J].水利学报,2014,45(9): |
| 静水压下混凝土水分与氯离子渗透及其相关性研究 |
| Research on water and chloride penetration into concrete under static water pressure and their correlation |
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| DOI： |
| 中文关键词: 静水压力 混凝土 水分渗透 氯离子渗透 |
| 英文关键词: static water pressure concrete water penetration chloride penetration |
| 基金项目: |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| The influence of static pressure on water and chloride penetration into concrete and their correlation have been studied through penetration tests on three types of concrete under different pressure and duration time. The results indicate that water cement ratio is an important parameter for water penetration even under static pressure. The water penetration depth in concrete with W/C ratio of 0.5 is 1.3 times of the penetration depth in concrete with W/C ratio of 0.4. With addition of 20 % fly ash and slag， concrete has higher resistance to water penetration，which depth is approximate 59.6 % of normal concrete. The mineral admixtures also increase the abilities of chemical bond and physical absorption of binding matrix to chloride ions. This leads to only 42.5 % of penetration depth of chloride compared with normal concrete. Chloride penetration does not follow water penetration exactly， but behind water front. The penetration depth of water and chloride can be related well by a linear function. |
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