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Effect of flow rate on spatio-temporal deterioration of concrete under flowing sulfate attack
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2024-11-28 , DOI: 10.1016/j.cemconres.2024.107734
Fujian Yang, Zhihao Zhao, Yuan Liu, Man Li, Jinliang Song, Dawei Hu, Hui Zhou

Flowing effect on concrete deterioration caused by sulfate attack at varying flow rates was studied. It was found that an increased flow rate can expedite the weakening of the concrete's elastic modulus in the short term, thus causing an earlier onset of this weakening. However, the long-term deterioration of the elastic modulus remains unaffected by the flow rate due to the limited amount of products responsible for concrete deterioration. Notably, the deterioration depth or rate of the elastic modulus increases with higher flow rates due to the scouring effect of sulfate flow. To quantify this acceleration effect, an acceleration coefficient was defined, representing the impact of flow rate on the weakening process of concrete. It is approximately 1.20 for every 0.5 m/s increase in flow rate within the tested range. This coefficient provides a useful metric to assess the durability of concrete to sulfate attack under varying flow conditions.

中文翻译:


流速对硫酸盐流动侵蚀下混凝土时空劣化的影响



研究了不同流速下硫酸盐侵蚀引起的混凝土劣化的流动效应。研究发现,流速的增加可以在短期内加速混凝土弹性模量的减弱,从而导致这种减弱的提前开始。然而,由于导致混凝土劣化的产品数量有限,弹性模量的长期劣化仍然不受流速的影响。值得注意的是,由于硫酸盐流的冲刷效应,弹性模量的劣化深度或速率随着流速的增加而增加。为了量化这种加速效应,定义了一个加速度系数,表示流速对混凝土弱化过程的影响。在测试范围内,流量每增加 0.5 m/s,大约为 1.20。该系数提供了一个有用的指标,用于评估混凝土在不同流动条件下对硫酸盐侵蚀的耐久性。
更新日期:2024-11-28
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