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張忠維 ，葛懷宇 ，柴建強

（ 中建七局國際工程建設有限公司 ，廣東 廣州 510400)

摘   要： 為了分析納米碳酸鈣摻量和硫酸鈉溶液腐蝕時間對納米改性混凝土使用性能的影響規律，制備了 5 組不同納米碳酸鈣摻量的納米改性混凝土試件，開展了 0 ~ 300 d 的硫酸鈉溶液腐蝕試驗，測試了不同納米碳酸鈣摻量和硫酸鈉溶液腐蝕時間下的力學性能和抗硫酸鹽腐蝕性能 。研究結果表明： ( 1) 納米改性混凝土的抗 壓強度 、抗折強度均隨泡硫酸鹽溶液時間的增長而上升；(2) 隨著浸泡硫酸鹽溶液時間的增大，納米碳酸鈣添 加對混凝土的質量損失率有顯著改善； (3) 納米碳酸鈣添加可以有效降低混凝土硫酸鹽溶液腐蝕層的厚度； (4) 納米改性混凝土中納米碳酸鈣最佳摻量為1. 8%。

關鍵詞： 納米改性混凝土； 納米碳酸鈣； 耐久性能； 腐蝕層厚度

中圖分類號： TU528. 45      

文獻標志碼： A      

文章編號： 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

?基金項目： 國家自然科學基金  (51608041 ) 。

作者簡介： 張忠維  ( 1978—) , 男 ，本科 ，高級工程師 ，主 要研究方向： 改性水泥的制備與應用。

收稿日期： 2022-09-26