Implementing the effect of geopolymer concrete pore solution pH in the standard rapid migration test NT Build 492 protocol

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

Materials and Structures Pub Date : 2025-02-11 DOI:10.1617/s11527-025-02586-0

Yu Pang, Quang Dieu Nguyen, Arnaud Castel

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Abstract

This research investigates the impact of the pore solution pH values on chloride content at the colour change boundary determined according to the standard rapid migration test (NT Build 492), with a focus on alkali-activated materials, so-called geopolymer. The study investigates a range of geopolymer formulations using various proportions of ground granulated blast furnace slag (GGBFS), fly ash, and calcined clay, alongside different activator concentrations, to examine their influence on the pH value of the pore solution. Findings from this study suggest that the pH value of the pore solution greatly influence in the chloride ion concentration at the colour change boundary, which should be accounted for in the calculation of the non-steady-state migration coefficients (D_nssm). It is noted that mixtures with higher GGBFS content exhibit higher pH values than mixtures containing fly ash or calcined clay, impacting the D_nssm. The results advocate for modifications to the standard NT Build 492 protocol to enhance its applicability and accuracy for geopolymer materials, emphasizing the importance of using revised D_nssm values calculated considering the unique properties of geopolymer concrete for more durability assessment.

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实施地聚合物混凝土孔隙溶液pH值对标准快速迁移试验NT Build 492协议的影响

本研究调查了孔隙溶液pH值对根据标准快速迁移试验（NT Build 492）确定的颜色变化边界处氯化物含量的影响，重点关注碱活化材料，即所谓的地聚合物。该研究研究了一系列地聚合物配方，使用不同比例的磨粒高炉渣（GGBFS）、粉煤灰和煅烧粘土，以及不同的活化剂浓度，以研究它们对孔隙溶液pH值的影响。本研究的结果表明，孔隙溶液的pH值对颜色变化边界处的氯离子浓度有很大影响，这应该在计算非稳态迁移系数（dnsm）时考虑到。GGBFS含量较高的混合料pH值高于含有粉煤灰或煅烧粘土的混合料，影响了dssm。结果主张修改标准NT Build 492协议，以提高其对地聚合物材料的适用性和准确性，强调使用经修订的Dnssm值计算的重要性，考虑到地聚合物混凝土的独特性能，以便进行更多的耐久性评估。

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.