Influence of moisture on the development of delayed ettringite formation

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2023-02-16 DOI:10.1680/jmacr.22.00282

R. Martin, Amandine Bonnet, J. Renaud, R. Chlela, F. Toutlemonde, C. Sauvaget

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引用次数: 3

Abstract

Delayed Ettringite Formation (DEF) is strongly affected by moisture. Thus, understanding the effect of this parameter on the related degradations is of prime interest, not only for prevention strategies, but also for re-assessment of affected structures. While Alkali Aggregate Reaction (AAR) has deserved many research efforts on this aspect, understanding the effect of moisture on DEF still deserves to be studied, especially for exposure conditions being representative of field exposure. This paper describes an experimental program that aims to contribute to this objective. It consists in exposing concrete specimens with different DEF potentials to controlled moisture and water supply conditions, either constant or variable. The test results with these first conditions will help to determine coupling relations between moisture and expansion while test results of variable conditions will be used to benchmark these equations. To ensure exposure conditions as stable as possible, a specific experimental setup has been developed and is presented in this paper. Moreover, determination of the wetting-drying cycles applied to some specimens is presented and preliminary results are displayed and analysed.

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水分对延迟钙矾石形成发展的影响

延迟Ettringite形成（DEF）受到湿气的强烈影响。因此，了解该参数对相关退化的影响是最重要的，不仅对于预防策略，而且对于重新评估受影响的结构也是如此。尽管碱-骨料反应（AAR）值得在这方面进行许多研究，但了解水分对DEF的影响仍然值得研究，尤其是对于代表现场暴露的暴露条件。本文描述了一个实验计划，旨在促进这一目标。它包括将具有不同DEF电位的混凝土试样暴露在受控的湿度和供水条件下，无论是恒定的还是可变的。这些第一条件下的测试结果将有助于确定水分和膨胀之间的耦合关系，而可变条件下的试验结果将用于对这些方程进行基准测试。为了确保曝光条件尽可能稳定，本文开发并介绍了一种特定的实验装置。此外，还对一些试样的干湿循环进行了测定，并对初步结果进行了显示和分析。

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

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.