铬铁渣在硫酸和硫酸盐侵蚀下的混凝土降解效应

IF 3.4 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Anubha Pujary, Tara Prasad Rath, Safalya Mohanty, Nibedita Pradhan, Trilochan Jena, Chittaranjan Panda
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引用次数: 0

摘要

铬铁渣(FS)具有良好的机械性能,可作为混凝土骨料加以有效利用。我们用 FS、天然石子(NS)和掺有 2% 硝酸铬盐(CR)作为粗骨料的 NS 混凝土制备了混凝土试样。试样在 pH 值为 2 的硫酸溶液和 10% 的硫酸镁等侵蚀性养护溶液中进行养护,以检查其在强度损失、质量减少和表面损伤等方面的退化情况。对养护 28 天、56 天和 90 天后的退化效果进行了评估。结果表明,与 NS 和 CR 混凝土相比,FS 混凝土的强度降低幅度最小,质量降低幅度最小,表面劣化程度较轻。FS 中含有大量对环境有害的残留铬,但从微观结构研究中可以看出,这些铬含量几乎都被固定在矿渣基质中。使用 FS 作为粗骨料的混凝土试件,其固定铬作为钝化剂,可提供更好的耐腐蚀性,同时使用矿渣水泥作为粘结剂,可提供一些保护措施,防止在侵蚀性酸和硫酸盐作用下产生腐蚀效应。这就是这项工作的主要研究意义,它将为全球研究提供一个合适的平台,以进一步探索暴露在不同侵蚀性养护环境中的混凝土结合料 FS 的耐腐蚀性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Degradation effects in concrete bound ferrochrome slag under aggressive sulphuric acid and sulphate attack

Degradation effects in concrete bound ferrochrome slag under aggressive sulphuric acid and sulphate attack

Ferrochrome slag (FS) having favourable mechanical properties) may be gainfully utilised as concrete aggregate. The concrete specimens with FS, natural stones (NS) and NS concrete mixed with 2% chromium nitrate salt (CR) as coarse aggregate were prepared. The samples were cured in aggressive curing solution like sulphuric acid solution at pH 2 and 10% magnesium sulphate in order to examine its degradation aspects in terms of possible loss of strength, reduction of mass and the surface damage. The deterioration effects are assessed after 28, 56, and 90 days of curing. The results indicate that FS concrete has the minimum reduction of strength, least reduction of mass and less surface deterioration in comparison to concrete with NS and CR. FS has appreciable amount of environmentally deleterious residual chromium but almost all of these chromium contents are inherently immobilized in the slag matrix as evidenced in microstructure study. The concrete specimens using FS as coarse aggregate with its immobile chromium acting as passivation agent may provide better corrosion resistance and along with the usage of slag-based cement as binder furnish some protection measures against the corrosion effect under aggressive acid and sulphate action. This is the principal research significance of this work and it will provide a suitable platform for global research to explore the further work on the corrosion resistance of concrete bound FS exposed to different aggressive curing environment.

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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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