Investigation on Preparation and Application in Concrete of Physically Modified Fly Ash

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
Sun Zhisheng, Zhu Wenshang, Ma Zhaomo, Wang Xingqin, Yang Zhongmao, Zou Chunye, Huang Qin, Feng Xianxu, Rao Zhengtang
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引用次数: 0

Abstract

Raw fly ash (RFA) was modified by a self-developed new dry energy-saving vertical grinding mill. This was beneficial to improve the particle morphology and distribution of RFA and enhanced its practical applicability in cement and concrete. The physical modification mechanism of RFA was elucidated by simulating the grinding process, and the physical properties and the application performance of modified fly ash (MFA) were characterized. The results demonstrated that the new grinder can effectively realize the physical modification of RFA and significantly improve its properties because the porous structure and the intactness of glass beads of RFA are preserved without being destroyed. The fineness of MFA was improved to the standard of Class I or II fly ash, the 28 d strength activity index of which was increased by 7% to 17%. The fluidity of mortar was also improved by 15 to 34 mm. In addition, the water requirement ratio can be significantly reduced when MFA is used to prepare C30 and C45 concrete. The 28 d strength of concrete with 50% content of MFA was increased by 23.76% and 15.84%, respectively. These results suggest that the grinding process studied here is a novel method for improving the performance of MFA.

物理改性粉煤灰的制备及在混凝土中的应用研究
采用自主研发的新型干法节能立磨对生料粉煤灰(RFA)进行改性。这有利于改善 RFA 的颗粒形态和分布,提高其在水泥和混凝土中的实用性。通过模拟粉磨过程,阐明了 RFA 的物理改性机理,并对改性粉煤灰(MFA)的物理性质和应用性能进行了表征。结果表明,新型研磨机能有效实现对 RFA 的物理改性,并显著改善其性能,因为 RFA 的多孔结构和玻璃微珠的完好性没有被破坏。MFA 的细度提高到了 I 级或 II 级粉煤灰的标准,其 28 d 强度活性指数提高了 7% 至 17%。砂浆的流动性也提高了 15 至 34 毫米。此外,用 MFA 配制 C30 和 C45 混凝土时,可显著降低需水量比。含 50% MFA 的混凝土 28 d 强度分别提高了 23.76% 和 15.84%。这些结果表明,本文研究的研磨工艺是提高 MFA 性能的一种新方法。
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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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