纳米SiO2-CSA-OPC复合修补砂浆的抗盐渍土侵蚀性能研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (1): 83-89.

所属专题：水泥混凝土

纳米SiO₂-CSA-OPC复合修补砂浆的抗盐渍土侵蚀性能研究

朱殿之¹, 刘祚宇¹, 董昶宏¹, 刘庆峰², 牛梦蝶², 李国新²

1.中国能源建设集团甘肃省电力设计院有限公司,兰州 730050;
2.西安建筑科技大学材料科学与工程学院,西安 710055

收稿日期:2020-07-24 修回日期:2020-08-18 出版日期:2021-01-15 发布日期:2021-02-07
作者简介:朱殿之(1973—),男,教授级高工。主要从事建筑结构方面的研究。E-mail:zhudianzhi123@126.com

Study on Corrosion Resistance of Nano SiO₂-CSA-OPCRepair Mortar in Saline Soil

ZHU Dianzhi¹, LIU Zuoyu¹, DONG Changhong¹, LIU Qingfeng², NIU Mengdie², LI Guoxin²

1. China Energy Construction Group Gansu Electric Power Design Institute Co.,Ltd.,Lanzhou 730050,China;
2. School of Materials Science and Engineering,Xi’an University of Architecture & Technology,Xi’an 710055,China

Received:2020-07-24 Revised:2020-08-18 Online:2021-01-15 Published:2021-02-07

摘要/Abstract

摘要： 为了研究纳米SiO₂-硫铝酸盐水泥-普通硅酸盐水泥(NS-CSA-OPC)复合修补砂浆的抗盐渍土侵蚀性能,采用在NaCl溶液、Na₂SO₄溶液及NaCl-Na₂SO₄复合溶液下的长期半浸泡试验模拟盐渍土侵蚀环境,以加速侵蚀NS-CSA-OPC砂浆试件。试验测试了3种侵蚀环境下,NS-CSA-OPC修补砂浆质量、相对动弹性模量、抗压耐蚀系数及氯离子含量的变化规律。结果表明:NS-CSA-OPC砂浆在3种侵蚀溶液中均表现出良好的抗侵蚀能力,浸泡270 d后体系的抗压耐蚀系数仍大于1.0;在长期半浸泡试验过程中,3种侵蚀溶液对NS-CSA-OPC砂浆的腐蚀程度由大到小依次为Na₂SO₄溶液＞NaCl-Na₂SO₄复合溶液＞NaCl溶液;氯盐的存在对硫酸盐的侵蚀膨胀破坏有一定的减缓作用。

关键词: 纳米二氧化硅, 硫铝酸盐水泥, 普通硅酸盐水泥, 半浸泡, 抗盐渍土侵蚀, 抗压强度

Abstract: In order to study the corrosion resistance of nano-SiO₂-sulphoaluminate cement-ordinary Portland cement (NS-CSA-OPC) repair mortar in saline soil,the long-term semi-immersion test in NaCl solution,Na₂SO₄ solution and NaCl-Na₂SO₄ composite solution was used to simulate the saline soil corrosion environment and accelerate the corrosion of NS-CSA-OPC mortar specimens.The change law of NS-CSA-OPC repair mortar on the mass,relative dynamic elastic modulus,compressive corrosion resistance coefficient and chloride ion content under three corrosion environments were tested.The results show that NS-CSA-OPC mortar shows excellent corrosion resistance in the three kinds of corrosion solutions,and the compressive corrosion resistance coefficients of the system are higher than 1.0 after soaking for 270 d;in the long-term semi-immersion test,the corrosion degree of three corrosion solutions to NS-CSA-OPC repair mortar is:Na₂SO₄>NaCl-Na₂SO₄>NaCl;the existence of chloride mitigates the corrosion expansion damage of sulfate.

Key words: nano silica, sulphoaluminate cement, ordinary Portland cement, semi-immersion, saline soil corrosion resistance, compressive strength

中图分类号:

TU525

朱殿之, 刘祚宇, 董昶宏, 刘庆峰, 牛梦蝶, 李国新. 纳米SiO₂-CSA-OPC复合修补砂浆的抗盐渍土侵蚀性能研究[J]. 硅酸盐通报, 2021, 40(1): 83-89.

ZHU Dianzhi, LIU Zuoyu, DONG Changhong, LIU Qingfeng, NIU Mengdie, LI Guoxin. Study on Corrosion Resistance of Nano SiO₂-CSA-OPCRepair Mortar in Saline Soil[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 83-89.

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纳米SiO₂-CSA-OPC复合修补砂浆的抗盐渍土侵蚀性能研究

Study on Corrosion Resistance of Nano SiO₂-CSA-OPCRepair Mortar in Saline Soil

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