木质素磺酸钠衍生物对钢筋的阻锈作用研究

江帅帅, 杨恒, 周钰鑫, 季涛, 牛龙龙, 张士萍

doi:10.16577/j.issn.1001-1560.2024.0184

材料保护 >

2024 , Vol. 57 >Issue 8: 115 - 121

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0184

研究篇

木质素磺酸钠衍生物对钢筋的阻锈作用研究

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(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)

张士萍(1982-)，博士，教授，主要从事混凝土方面的研究，电话:13770604152，E-mail:18018595459＠163.com

收稿日期: 2023-09-22

修回日期: 2024-01-07

录用日期: 2024-01-15

网络出版日期: 2024-09-24

基金资助

国家自然科学基金面上项目(52078247)

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Study on the Corrosion-Inhibiting Effect of Sodium Lignosulfonate Derivatives on Rebar

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(1.College of Civil Engineering， Anhui Jianzhu University， Hefei 230601， China；2.Materials and Structural Engineering Department， Nanjing Hydraulic Research Institute， Nanjing 210029， China；3.School of Architecture Engineering， Nanjing Institute of Technology， Nanjing 211167， China)

ZHANG Shiping(1982-)， Ph.D.， Professor， Research Focus: Concrete， Tel: 13770604152，E - mail:18018595459＠163.com

Received date: 2023-09-22

Revised date: 2024-01-07

Accepted date: 2024-01-15

Online published: 2024-09-24

Supported by

National Natural Science Foundation of China(5207827)

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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。

关键词： 木质素磺酸钠; 改性; 阻锈剂; 钢筋; 氯离子

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江帅帅, 杨恒, 周钰鑫, 季涛, 牛龙龙, 张士萍 . 木质素磺酸钠衍生物对钢筋的阻锈作用研究[J]. 材料保护, 2024 , 57(8) : 115 -121 . DOI: 10.16577/j.issn.1001-1560.2024.0184

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 corrosion-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 investigate 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 sodium lignosulfonate derivatives reached 350 mm， with a water-reducing effect comparable to that of polycarboxylate， thus meeting the requirements for concrete flowability and strength.

Key words： sodium lignosulfonate; modification; corrosion inhibitor; rebar; chloride ion

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