Long-term sulfate attack on recycled aggregate concrete immersed in sodium sulfate solution for 10 years

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-02-19 DOI:10.3989/mc.2020.06319

L. Santillán, F. Locati, Y. Villagrán-Zaccardi, C. Zega

引用次数: 11

Abstract

The effect of recycled concrete aggregate (RCA) on concrete performance against external sulfate attack (ESA) is not yet fully known. In this paper, recycled aggregate concretes (RAC) with 0, 50, 75 and 100% of RCA contents were evaluated after 10 years of exposure immersed in 50g/l sodium sulfate solution. Sulfate ingress profiles were obtained by wet chemical analyses and FRX. Also, the mineralogy of the ingress profile was evaluated by thermogravimetric analyses. Finally, microcracking development in samples was evaluated by optical fluorescent microscopy image analysis. Although RAC showed a slight increase in sulfate ingress, due to its higher porosity (about 30% higher SO3 content near the surface for 50% or higher replacement ratio than control concrete), a dense new matrix still allows a good performance of RAC to external sulfate attack with even 100% RCA content.

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浸没硫酸钠溶液10年对再生骨料混凝土的长期硫酸盐侵蚀

再生混凝土骨料（RCA）对混凝土抗外部硫酸盐侵蚀性能（ESA）的影响尚不完全清楚。本文对RCA含量分别为0、50、75和100%的再生骨料混凝土（RAC）在50g/l硫酸钠溶液中浸泡10年后进行了评估。通过湿化学分析和FRX获得硫酸盐侵入剖面。此外，还通过热重分析对入口剖面的矿物学进行了评估。最后，通过光学荧光显微镜图像分析评估了样品中微裂纹的发展。尽管RAC的硫酸盐进入量略有增加，但由于其较高的孔隙率（在50%或更高的置换率下，表面附近的SO3含量比对照混凝土高出约30%），即使RCA含量为100%，致密的新基质仍然允许RAC对外部硫酸盐侵蚀具有良好的性能。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.