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张忠维 ，葛怀宇 ，柴建强

（ 中建七局国际工程建设有限公司 ，广东 广州 510400)

摘   要： 为了分析纳米碳酸钙掺量和硫酸钠溶液腐蚀时间对纳米改性混凝土使用性能的影响规律，制备了 5 组不同纳米碳酸钙掺量的纳米改性混凝土试件，开展了 0 ~ 300 d 的硫酸钠溶液腐蚀试验，测试了不同纳米碳酸钙掺量和硫酸钠溶液腐蚀时间下的力学性能和抗硫酸盐腐蚀性能 。研究结果表明： ( 1) 纳米改性混凝土的抗 压强度 、抗折强度均随泡硫酸盐溶液时间的增长而上升；(2) 随着浸泡硫酸盐溶液时间的增大，纳米碳酸钙添 加对混凝土的质量损失率有显著改善； (3) 纳米碳酸钙添加可以有效降低混凝土硫酸盐溶液腐蚀层的厚度； (4) 纳米改性混凝土中纳米碳酸钙最佳掺量为1. 8%。

关键词： 纳米改性混凝土； 纳米碳酸钙； 耐久性能； 腐蚀层厚度

中图分类号： TU528. 45      

文献标志码： A      

文章编号： 1005-8249 (2023) 05-0055-05

DOI : 10. 19860/j.cnki.issn1005-8249.2023.05.009

ZHANG Zhongwei , GE Huaiyu , CHAI Jianqiang

( CSCEC 7th Division International Engineering Co. ，Ltd. ，Guangzhou 510400 , China)

Abstract: To analyze the influence law of nano-calcium carbonate content and sodium sulfate solution corrosion time on the nano-modified concrete service performance, 5 groups of nano-modified concrete specimens with different nano-calcium carbonate content were prepared, and the sodium sulfate solution corrosion test was carried out for 0-300 d. The mechanical properties and resistance to sulfate corrosion were measured under different nano-calcium carbonate content and sodium sulfate solution corrosion time. The results show that: (1) the nano-modified concrete compressive and flexural strength increase with the time of soaking sulfate solution. (2) With the increase of soaking time in sulfate solution, the mass loss rate of concrete can be significantly improved by adding nano-calcium carbonate. (3) Nano-calcium carbonate can effectively reduce the thickness of the corrosion layer of concrete sulfate solution. (4) The optimum content of nanometer calcium carbonate in nanometer modified concrete is 1.8%.

Keywords: nano modified concrete; nanometer calcium carbonate; durability performance; corrosion layer thickness

∗基金项目： 国家自然科学基金  (51608041 ) 。

作者简介： 张忠维  ( 1978—) , 男 ，本科 ，高级工程师 ，主 要研究方向： 改性水泥的制备与应用。

收稿日期： 2022-09-26