In situ determination of cement paste porosity in parallel with corrosion study of aluminium alloy 1100 in Portland cement pastes

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2024-10-24 DOI:10.1617/s11527-024-02491-y

Xiang Li, Sébastien Caes, Thomas Pardoen, Geert De Schutter, Tom Hauffman, Bruno Kursten

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引用次数: 0

Abstract

A quantitative characterization of the capillary porosity of cement pastes has been performed in the context of corrosion of aluminium alloy 1100 in contact with Portland cement pastes. The originality of the study is to combine an electrical equivalent circuit model identified based on electrochemical impedance spectroscopy (EIS) data and a two-phase model derived from the general effective media theory (GEM). The effective resistance of the cement paste entering the GEM is approximated by the resistance of connected capillary pores as provided by the EIS analysis to determine the evolving porosity of cement pastes. Mercury intrusion porosimetry data agree with the porosity results obtained from EIS. The porosity in the 0.36 OPC is reduced from ~ 15% to below 10% over the first 30 days and then keeps decreasing slowly, while the porosity of the 0.36 OPC + 3% LiNO₃ samples slightly decreases at the beginning and finally remains constant at ~ 10%. For the 0.50 OPC + 1.607% Li₂CO₃ composition, the porosity decreases from ~ 25% to ~ 15% over the first 30 days. The influence of the curing conditions is also studied to extract the impact on the porosity. Besides, the diffusion of corrosion products is limited to a small region near the interface and hence the corrosion process does not affect the porosity of the cement paste.

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原位测定水泥浆孔隙率与波特兰水泥浆中铝合金 1100 的腐蚀研究同步进行

在铝合金 1100 与波特兰水泥浆接触发生腐蚀的情况下，对水泥浆的毛细管孔隙率进行了定量分析。这项研究的独创之处在于将根据电化学阻抗谱（EIS）数据确定的电气等效电路模型与一般有效介质理论（GEM）推导出的两相模型相结合。水泥浆进入 GEM 的有效电阻近似于 EIS 分析提供的相连毛细孔的电阻，从而确定水泥浆的孔隙率。汞侵入孔隙模拟数据与 EIS 得出的孔隙率结果一致。在最初的 30 天内，0.36 OPC 的孔隙率从约 15%降至 10%以下，然后缓慢下降；而 0.36 OPC + 3% LiNO3 样品的孔隙率在开始时略有下降，最后保持在约 10%。至于 0.50 OPC + 1.607% Li2CO3 成分，在最初的 30 天内，孔隙率从 ~ 25% 降至 ~15%。我们还研究了固化条件对孔隙率的影响。此外，腐蚀产物的扩散仅限于界面附近的一小块区域，因此腐蚀过程不会影响水泥浆的孔隙率。

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.