An ASR exposure site after 30 years – Chemical composition of hydrates and ASR products

IF 13.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-09-30 DOI:10.1016/j.cemconres.2025.108043

Maxime Ranger , Andreas Leemann , Benoit Fournier

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Abstract

Concrete specimens containing two aggregates susceptible to alkali-silica reaction (ASR) and various supplementary cementitious materials (SCMs) have been exposed outdoors since 1992. After 30 years of expansion monitoring, some specimens were cored to conduct an in-depth analysis of their condition.

The chemical compositions of the hydrates and the ASR products were quantified with SEM-EDS. All SCMs increased the Si/Ca of the C-(A)-S-H, but the extent varied depending on their composition, amount and degree of reaction. Larger amounts of SCMs resulted in lower degrees of reaction.

The ASR products inside aggregate particles of non-boosted concrete mixtures were crystalline. Their Ca/Si was in the range 0.21–0.24, independent of the binder and the aggregate types. The (Na + K)/Ca was usually in the range 0.31–0.35. The Na/K varied more, correlating with the respective ratios in the binder. The Al content of the ASR products inside aggregate particles was not influenced by the presence of Al-rich SCMs.

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30年后的ASR暴露点-水合物和ASR产品的化学成分

自1992年以来，含有两种易受碱-硅反应（ASR）和各种补充胶凝材料（SCMs）影响的骨料的混凝土样品一直暴露在室外。经过30年的膨胀监测，对部分标本进行了取样，对其状况进行了深入分析。用扫描电镜能谱仪对水合物和ASR产物的化学成分进行了定量分析。所有SCMs均能提高C-(A)- s - h的Si/Ca，但其程度取决于其组成、用量和反应程度。大量的SCMs导致较低的反应程度。非增强混凝土混合料集料颗粒内部的ASR产物呈结晶状。Ca/Si值在0.21 ~ 0.24之间，与粘结剂和骨料类型无关。（Na + K）/Ca一般在0.31 ~ 0.35之间。Na/K的变化更大，与粘合剂中各自的比例相关。聚集体颗粒内ASR产物的Al含量不受富Al SCMs存在的影响。

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.