Carbonation-induced corrosion of steel in sodium carbonate alkali-activated slag

IF 3.9 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2025-09-18 DOI:10.1617/s11527-025-02696-9

Patrick Azar, Gabriel Samson, Cédric Patapy, François Cussigh, Laurent Frouin, Martin Cyr

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Abstract

The carbonation-induced corrosion of steel reinforcement embedded in sodium carbonate alkali-activated slag (AAS) and a CEM III/B reference binder were investigated. The primary objective of this study was to evaluate the influence of both natural and accelerated carbonation (1% CO₂) on reinforcement corrosion. Reinforced cylindrical mortars specimens with a low cover (8.5 mm) were cast and subjected to exposure under natural and accelerated carbonation conditions. The initial weights of the rebar were recorded with high precision prior to casting. Throughout one year of exposure, the corrosion potential and linear polarization resistance of the rebars were systematically monitored. Upon completion of the exposure period, the specimens were split to enable visual inspection of corrosion and to determine corrosion-induced mass loss. The applicability of the Stern-Geary equation to carbonated AAS systems was confirmed by comparing the corrosion current densities estimated from this equation (using a B-value of 26 mV) with the values calculated from the actual mass loss of the reinforcement, as determined by Faraday’s law. Although accelerated carbonation at 1% CO₂ induces differences in pH stabilization and carbonation product formation compared to natural carbonation, it was found to be representative method for quantifying reinforcement corrosion in AAS systems. Overall, AAS exhibited superior resistance to steel reinforcement corrosion compared to CEM III/B reference binder, which was attributed to the more stable and higher pH environment maintained within the AAS matrix.

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钢在碳酸钠碱活化渣中的碳化致腐蚀

研究了碳酸钠碱活性渣（AAS）和cemiii /B标准粘结剂对钢筋的碳化腐蚀。本研究的主要目的是评估自然碳化和加速碳化（1% CO2）对钢筋腐蚀的影响。浇铸低覆盖层（8.5 mm）的增强圆柱砂浆试件，并在自然和加速碳化条件下暴露。钢筋的初始重量在浇铸前被高精度地记录下来。在一年的暴露过程中，系统地监测了钢筋的腐蚀电位和线性极化电阻。在完成暴露期后，将试样分开，以便目视检查腐蚀情况并确定腐蚀引起的质量损失。通过比较由该方程估算的腐蚀电流密度（b值为26 mV）与由法拉第定律确定的钢筋实际质量损失计算的值，证实了Stern-Geary方程对碳酸化AAS体系的适用性。虽然与自然碳化相比，1% CO2加速碳化在pH稳定和碳化产物形成方面存在差异，但它被认为是量化AAS体系中钢筋腐蚀的代表性方法。总体而言，与CEM III/B标准粘结剂相比，AAS对钢筋的耐腐蚀性更强，这是由于AAS基体内保持了更稳定和更高的pH环境。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.