木质素磺酸钠衍生物对钢筋的阻锈作用研究
Study on the Corrosion-Inhibiting Effect of Sodium Lignosulfonate Derivatives on Rebar
江帅帅 1杨恒 2周钰鑫 3季涛 3牛龙龙 3张士萍3
作者信息
- 1. 安徽建筑大学土木工程学院,安徽 合肥 230601
- 2. 南京水利科学研究院材料结构研究所,江苏 南京 210029
- 3. 南京工程学院建筑工程学院,江苏 南京 211167
- 折叠
摘要
钢筋混凝土结构往往因钢筋锈蚀而发生过早破坏,加入阻锈剂可以有效抑制钢筋腐蚀,提高钢筋混凝土结构的耐久性.木质素磺酸盐作为一种绿色高效组分,具有良好的阻锈性能,但其减水效果较差,单独使用无法满足现代混凝土大流动度和高强度技术需求.为此,对木质素磺酸钠进行羟基、羧基接枝改性,合成了木质素磺酸钠衍生物,并将其掺入模拟孔溶液和水泥砂浆中,研究其对钢筋的阻锈作用.结果表明:模拟碱性氯盐环境和砂浆加速腐蚀环境下,木质素磺酸钠衍生物均可增大电荷转移电阻以及减小腐蚀电流密度,起到显著的阻锈作用;在水灰比为0.35时,掺入木质素磺酸钠衍生物的水泥净浆流动度可达350 mm,减水效果接近聚羧酸,可满足混凝土的流动性和强度需求.
Abstract
Reinforced concrete structures often fail prematurely due to rebar corrosion.Adding corrosion inhibitors can effectively mitigate rebar corrosion and enhance the durability of reinforced concrete structures.Lignosulfonate,as a green and efficient component,exhibits good corro-sion-inhibiting properties.However,its water-reducing effect is bad,and it cannot independently meet the technological demands of modern concrete technology for high fluidity and strength.In this study,sodium lignosulfonate was modified by grafting hydroxyl and carboxyl groups to synthesize sodium lignosulfonate derivatives.These derivatives were then incorporated into simulated pore solutions and cement mortar to inves-tigate their corrosion-inhibiting effects on rebar.Results showed that,in both simulated alkaline chloride environments and mortar accelerated corrosion environments,the sodium lignosulfonate derivatives increased the charge transfer resistance and reduced the corrosion current density,demonstrating significant corrosion inhibition.When the water-cement ratio was 0.35,the flowability of the cement paste with the addition of so-dium lignosulfonate derivatives reached 350 mm,with a water-reducing effect comparable to that of polycarboxylate,thus meeting the require-ments for concrete flowability and strength.
关键词
木质素磺酸钠/改性/阻锈剂/钢筋/氯离子Key words
sodium lignosulfonate/modification/corrosion inhibitor/rebar/chloride ion引用本文复制引用
基金项目
国家自然科学基金面上项目(52078247)
出版年
2024
NETL
NSTL
万方数据