Defective homes in Donegal, Ireland: Effect of exposure conditions and concrete quality on pyrrhotite oxidation and internal sulfate attack

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2024-09-24 DOI:10.1016/j.cemconres.2024.107684

Andreas Leemann , Beat Münch , Barbara Lothenbach , Frank Winnefeld , Paul Dunlop

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引用次数: 0

Abstract

Thousands of homes in County Donegal, Ireland, built from concrete blocks, are damaged by extensive cracks and crumbling that occurred a few years after construction. Recently, research has shown that pyrrhotite oxidation triggering internal sulfate attack (ISA) is the cause. In this study, samples from the strip foundations, the rising blocks, the outer and inner leaf of one undamaged reference home and three affected homes are investigated. As these four structural components differ by concrete quality, exposure condition or both, their effect on ISA is investigated. All three damaged homes contained pyrrhotite in the aggregates, while it was absent in the reference home. ISA in the foundations is in an initial state. It has progressed further in the rising blocks and is most advanced in the outer leaf. Whilst carbonation limits the effects of ISA in the inner leaf, further pyrrhotite oxidation will create expansion leading to ongoing deterioration.

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爱尔兰多尼戈尔有缺陷的房屋：暴露条件和混凝土质量对黄铁矿氧化和内部硫酸盐侵蚀的影响

在爱尔兰多尼戈尔郡，数以千计用混凝土砌块建造的房屋在建成几年后就出现了大面积的裂缝和坍塌。最近的研究表明，黄铁矿氧化引发的内部硫酸盐侵蚀（ISA）是造成这种现象的原因。在本研究中，我们对一栋未损坏的参照房屋和三栋受影响房屋的条形地基、隆起块、外叶和内叶进行了取样调查。由于这四个结构组件在混凝土质量、暴露条件或两者方面存在差异，因此研究了它们对 ISA 的影响。所有三个受损房屋的骨料中都含有黄铁矿，而参照房屋中则没有。地基中的 ISA 处于初始状态。它在升起的砖块中进一步发展，在外层叶片中最为严重。虽然碳化作用限制了内叶中 ISA 的影响，但黄铁矿的进一步氧化将产生膨胀，导致持续恶化。

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

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.