循环流化床粉煤灰对钢管混凝土膨胀性能的影响

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-10-17 DOI:10.1680/jadcr.23.00088

Ruizhen Yan, Guoju Ke, Dongxiao Han

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引用次数: 0

摘要

在绿色低碳材料发展的背景下，首次系统研究了循环流化床粉煤灰(CFBFA)替代水泥对不同养护条件下膏体膨胀性能的影响。然后，制备了含再生骨料和CFBFA的自密实混凝土(SCCs)，用于填充钢管。实验结果表明，由于CFBFA独特的物理化学性质，CFBFA的掺入显著提高了膏体达到标准稠度所需的需水量，并且由于形成了更多的膨胀成分(钙矾石、石膏和硅酸盐是CFBFA -水泥膏体的主要膨胀产物)，孔隙结构得到了优化，减少了大孔隙的数量。养护条件、龄期、CFBFA等因素对膨胀效果影响显著。当CFBFA含量为40%时，钢管中的RA SCC膨胀率为41 μm/m, 28天抗压强度达到48.9 MPa。

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Expansion properties of concrete-filled steel tubes with circulating fluidized bed fly ash

In the context of green and low-carbon materials development, the influence of replacing cement with circulating fluidised bed fly ash (CFBFA) on the expansion properties of paste under different curing conditions was first systematically investigated. Then, self-compacting concretes (SCCs) with recycled aggregate (RA) and CFBFA were prepared for filling steel tubes. The experimental results showed that, because of its unique physicochemical properties, the incorporation of CFBFA significantly increased the water requirement needed to achieve standard consistency of the paste and the pore structure was optimised by a reduction in the number of large pores due to the formation of more expansion components (ettringite, gypsum and portlandite are the main expansive products of CFBFA–cement paste). The influence of factors such as curing condition, age and CFBFA on the expansion effect was notable. With a 40% CFBFA content, the RA SCC in the steel tube showed an expansion of 41 μm/m, while the 28-day compressive strength reached 48.9 MPa.

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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.