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首页> 外文期刊>Materials and structures >Effect of dry-wet ratio on pore-structure characteristics of fly ash concrete under sulfate attack
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Effect of dry-wet ratio on pore-structure characteristics of fly ash concrete under sulfate attack

机译：干湿比对硫酸盐发作下粉煤灰混凝土孔隙结构特征的影响

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摘要

At present, a unified sulfate dry-wet cycle system has not been found, different researchers use various dry-wet cycle methods, and the research results are often difficult to systematize. In this study, dry-wet time ratios of 1:1, 3:1, 5:1, and 7:1 were employed to investigate the effect of sulfate drying-wetting cycles on the pore-structure characteristics of concrete. The wetting and drying temperatures were set to 25 and 60 degrees C, respectively, and the concrete specimens were subjected to drying-wetting cycles for 150 days. The evolution of the concrete property was characterized based on the flexural strength. Moreover, the mineralogical composition was analyzed through X-ray diffraction, and the sulfate content was measured through spectrophotometry. Mercury intrusion porosimetry was applied to determine the pore-structure parameters of concrete, and the microstructure of eroded concrete was analyzed through scanning electron microscopy. The results showed that the pore volume of concrete under sulfate attack decreased significantly, and the reduction in intrusion was mainly observed in pores of 50-200 nm. The generation and propagation of micro-pores and micro-cracks have an important impact on the deterioration of concrete performance.
机译：目前，尚未发现统一的硫酸盐干湿循环系统，不同的研究人员使用各种干湿循环方法，并且研究结果往往难以稳妥。在该研究中，采用1：1,3：1,5：1和7：1的干湿时间比来研究硫酸盐干燥润湿循环对混凝土孔隙结构特性的影响。将润湿和干燥温度分别设定为25和60℃，并将混凝土试样进行干燥润湿循环150天。基于弯曲强度的混凝土特性的演变。此外，通过X射线衍射分析矿物学组合物，通过分光光度法测量硫酸盐含量。施用汞侵入孔隙瘤法以确定混凝土的孔隙结构参数，通过扫描电子显微镜分析侵蚀混凝土的微观结构。结果表明，硫酸盐侵袭下混凝土的孔体积显着下降，侵入的减少主要观察到50-200nm的孔隙。微孔和微裂纹的产生和繁殖对混凝土性能的恶化产生了重要影响。

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  • 来源
    《Materials and structures》 |2021年第3期|100.1-100.13|共13页
  • 作者

    Wang Kun; Guo Jinjun; Liu Xuanjun; Yang Lin; Zhang Peng;

  • 作者单位

    Zhengzhou Univ Sch Water Conservancy Engn 100 Sci Ave Zhengzhou 450001 Henan Peoples R China;

    Zhengzhou Univ Sch Water Conservancy Engn 100 Sci Ave Zhengzhou 450001 Henan Peoples R China;

    Zhengzhou Univ Sch Water Conservancy Engn 100 Sci Ave Zhengzhou 450001 Henan Peoples R China;

    Zhengzhou Univ Sch Water Conservancy Engn 100 Sci Ave Zhengzhou 450001 Henan Peoples R China;

    Zhengzhou Univ Sch Water Conservancy Engn 100 Sci Ave Zhengzhou 450001 Henan Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Concrete; Sulfate attack; Drying#8211; wetting cycle; Dry#8211; wet ratio; Pore structure;

    机译：混凝土;硫酸盐攻击;干燥＆＃8211;润湿循环;干燥＆＃8211;湿比;孔结构;

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