Behaviour of a high-performance self-compacting concrete (HPSCC) with ternary mixtures of nano- and microsilica in the presence of chlorides

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-05-18 DOI:10.3989/mc.2020.10619

E. Reyes, J. Massana, F. Alonso, N. León, A. Moragues

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引用次数: 5

Abstract

In this paper, the influence of additions of nanosilica (nSi) and microsilica (mSi) on the behaviour of binary and ternary mixtures in chloride environments is studied. The main objective is to obtain high-performance self-compacting concrete (HPSCC) with a high durability which can meet specific demands in such aggressive environments. Ten blends were manufactured using Portland cement (CEM I 52.5 R) and additions of nSi and mSi in binary and ternary mixtures. The results of three tests frequently used to evaluate resistance to chloride penetration– electrical resistivity, migration and chloride diffusion –were studied and compared. Both binary and ternary mixtures presented significant improvements in chloride resistance, generally in proportion to the total content of the addition. In all the ternary mixtures, high resistivity is obtained, which indicates that such mixtures have a notably low chloride penetrability. Furthermore, these mixtures provided extremely low chloride diffusion coefficients even at small addition ratios.

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含纳米和微硅三元混合物的高性能自密实混凝土（HPSCC）在氯化物存在下的性能

本文研究了纳米二氧化硅(nSi)和微二氧化硅(mSi)的加入对二元和三元混合物在氯化物环境中的行为的影响。主要目标是获得高性能自密实混凝土(HPSCC)，具有高耐久性，可以满足这种恶劣环境下的特定要求。采用波特兰水泥(CEM I 52.5 R)和在二元和三元混合物中添加nSi和mSi制成了10种共混物。研究并比较了常用的三种抗氯化物渗透试验的结果——电阻率、迁移和氯化物扩散。二元和三元混合物的抗氯性都有显著的改善，通常与添加物的总含量成正比。在所有三元混合物中，获得了高电阻率，这表明这种混合物具有明显的低氯化物渗透性。此外，这些混合物即使在很小的添加比下也能提供极低的氯离子扩散系数。

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.