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煤矸石粉对再生骨料混凝土宏观力学性能及微观结构的影响

Influence of Coal Gangue Powder on the Macroscopic Mechanical Properties and Microstructure of Recycled Aggregate Concrete.

作者信息

Zhenli Zhi, Shu Zhile, Wu Qihong, Li Jiaxin, Wu Haikuang, Chen Wenlong, Zeng Xinhang

机构信息

School of Emergency Management Xihua University Chengdu 610039 China.

Sichuan Provincial Engineering Research Center of City Solid Waste Energy and Building Materials Conversion and Utilization Technology Chengdu 610106 China.

出版信息

Glob Chall. 2023 Oct 3;7(10):2300189. doi: 10.1002/gch2.202300189. eCollection 2023 Oct.

DOI:10.1002/gch2.202300189
PMID:37829679
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10566811/
Abstract

The construction and coal industries generate substantial industrial waste, including coal gangue and construction and demolition (C&D) waste, leading to environmental pollution and high disposal costs. Integrating recycled aggregates (RAs) and coal gangue powder (CGP) into concrete is an effective approach for waste management. However, CGP can affect the performance of traditional recycled concrete. This study primarily aims to optimize the utilization of RAs and CGP while maintaining concrete performance. They utilized orthogonal experimental designs and microscopic characterization techniques, including scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). Orthogonal experimental analysis indicated that with a water-cement ratio (WCR) of 0.5 and replacement rates of 10% for CGP and 60% for RA, compressive and splitting tensile strengths reached 73.6% and 77.4% of ordinary C30 concrete, respectively. This mix proportion minimizes strength decline in coal gangue powder-recycled aggregate concrete (CGP-RAC) while maximizing recycled material replacement. Microscopic analysis revealed that CGP increased the Ca/Si ratio in cement paste, impeding hydration reactions, resulting in a looser internal structure and reduced concrete strength. These findings are anticipated to provide fresh theoretical insights for solid waste recycling and utilization.

摘要

建筑和煤炭行业产生大量工业废弃物，包括煤矸石以及建筑与拆除（C&D）废弃物，这导致了环境污染和高昂的处置成本。将再生骨料（RAs）和煤矸石粉（CGP）掺入混凝土中是一种有效的废弃物管理方法。然而，煤矸石粉会影响传统再生混凝土的性能。本研究主要旨在优化再生骨料和煤矸石粉的利用，同时保持混凝土性能。他们采用了正交试验设计和微观表征技术，包括扫描电子显微镜（SEM）、能量色散X射线光谱仪（EDS）和X射线衍射（XRD）。正交试验分析表明，水灰比（WCR）为0.5，煤矸石粉取代率为10%，再生骨料取代率为60%时，抗压强度和劈裂抗拉强度分别达到普通C30混凝土的73.6%和77.4%。这种配合比可使煤矸石粉-再生骨料混凝土（CGP-RAC）的强度下降最小化，同时使再生材料的取代率最大化。微观分析表明，煤矸石粉提高了水泥浆体中的Ca/Si比，阻碍了水化反应，导致内部结构更松散，混凝土强度降低。这些研究结果有望为固体废物的回收利用提供新的理论见解。

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引用本文的文献

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