Effect of isobutyl-triethoxy-silane penetrative protective agent on the carbonation resistance of concrete

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• 作者：Qiang Xu 徐强 ; Shulin Zhan 詹树林 ; Bingzheng Xu…
• 关键词：carbonation resistance ; penetrative protective agent ; isobutyl ; triethoxy ; silane ; mineral admixture ; marine material
• 刊名：Journal of Wuhan University of Technology--Materials Science Edition
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：31
• 期：1
• 页码：139-145
• 全文大小：1,392 KB
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• 作者单位：Qiang Xu 徐强 (1) (2)
  Shulin Zhan 詹树林 (1)
  Bingzheng Xu (2)
  Hui Yang (2) (3)
  Xiaoqian Qian (1)
  Xiaofu Ding (4)
  
  1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, 310058, China
  2. Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
  3. Zhejiang-California International NanoSystems Institute, Hangzhou, 310058, China
  4. Zhejiang Heli New Building Materials Co., Ltd, Jinhua, 321100, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Chinese Library of Science
  
• 出版者：Wuhan University, co-published with Springer
• ISSN：1993-0437

文摘

Effect of isobutyl-triethoxy-silane penetrative protective agent on the carbonation resistance of the concrete was studied. The concrete specimens for the 28 d accelerated carbonation process were manufactured with w/c of 0.49 and 0.64, both in the presence and absence of silane and mineral admixture. The penetration of isobutyl-triethoxy-silane and the carbonation of concrete were investigated by penetration depth, carbonation depth, XRD, SEM, and pore size distribution. The results showed that concrete compactness played an important role in the silane penetration and carbonation resistance. Penetration depth of silane-treated concrete mainly depended on the compactness of the concrete, and could not remarkably change through the accelerated carbonation process. In the accelerated carbonation process, penetrative protective agent improved the carbonation resistance of the higher compactness concretes but accelerated the carbonization process of the lower compactness concretes. As penetrative protective agent penetrated along the external connectivity pores into concrete not filling the entire surface area, the inorganic film could not fully protect the Ca(OH)₂ phase from carbonation. After 28 d accelerated carbonation, fibrous hydration products disappeared and the surface holes decreased. Due to the formation of carbonized products, the porosity of the concrete surface decreased, especially in high-strength concrete. Key words carbonation resistance penetrative protective agent isobutyl-triethoxy-silane mineral admixture marine material