| 摘要: |
| “烟塔合一”排烟冷却塔混凝土内壁上的冷凝溶液含有大量的SO2-4，NO-3，H+，会对混凝土产生侵蚀作用.采用室内试验，对比研究了实际运行温度下普通混凝土（NC30）、高性能混凝土（HPC30，HPC50）及超高性能混凝土（UHPC）在冷凝溶液浸泡作用下的耐久性.结果表明：在冷凝溶液中浸泡95d时，NC30的质量损失率最大达到76%，UHPC的质量损失率仅为13%，而HPC30，HPC50的质量损失率分别为44%，40%.经过冷凝溶液浸泡后，NC30，HPC30和HPC50的抗压强度随浸泡时间的增加呈现先增大后减小的趋势，浸泡95d时分别减小了403%，319%和198%，而UHPC经过冷凝溶液浸泡后的抗压强度呈持续下降趋势，但是其损失率仅为94%. |
| 关键词: 排烟冷却塔 冷凝溶液 侵蚀 高性能混凝土 超高性能混凝土 耐久性 |
| DOI：103969/j.issn.1007 9629201802016 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51578049，51278039） |
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| Durability of Concrete in Natural Draft Cooling Tower with Flue Gas Injection |
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AN Mingzhe, GAO Yang, WANG Yue, HAN Song, YU Ziruo, JI Wenyu
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School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
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| Abstract: |
| The condensate solution stuck to the inner wall of natural draft cooling tower with flue gas injection contains large amount of SO2-4, NO-3 and H+, and it could erode the inner wall concrete. Therefore, the durability of ordinary concrete(NC30), high performance concrete(HPC30 and HPC50) and ultra high performance concrete(UHPC) in the above environment under the actual operating temperature were studied through the indoor immersion experiments. The results show that the mass loss rate of NC30 reached the maximum, which is 76%, after 95days condensate solution immersion. But for UHPC the value is just 13%, and for HPC30 and HPC50, the value is 44% and 40%, respectively. The compressive strength of NC30, HPC30 and HPC50 increases first and then reduces with the increase of immersion time, and their strength loss rate is 403%,319% and 198%, respectively, after 95days immersion. The compressive strength of UHPC decreased with the increase of condensate solution immersion time, but its value is only 94% at the same time. |
| Key words: natural draft cooling tower with flue gas injection condensate solution erosion high performance concrete ultra high performance concrete durability |
