Hydration and Hardening Properties of High Fly-Ash Content Gel Material for Cemented Paste Backfill Utilization.

IF 5 3区 化学 Q1 POLYMER SCIENCE Gels Pub Date : 2024-09-27 DOI:10.3390/gels10100623
Bolin Xiao, Jiandong Wang, Aixiang Wu, Ruiming Guo
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Abstract

As more and more mines utilize the cemented paste backfill (CPB) mining method, the demand for reducing backfill cost and carbon footprint is increasing and becoming more critical. In this work, a new backfill gel binder made with 40 wt.% of low-quality Class F fly ash (FCM) is proposed to replace ordinary Portland cement (OPC). The binder hydration and gel hardening properties were experimentally investigated through X-ray diffraction, Mercury intrusion porosimetry, uniaxial compression, and thermogravimetric analysis. Three different mine tailings were used to verify the FCM's applicability. Results show that the strength performance of FCM-CPB is 72% of that of OPC-CPB, while FCM production cost is almost less than half of OPC. The hydration process of the FCM-CPB can be divided into five stages, and the main hydration products are ettringite and gel-like hydrates. The 31.2% porosity of FCM-CPB at 28-day curing is higher than that of 7-day curing, while the average pore size is lower, and the structure is denser. The FCM can meet the strength requirement of three different mine tailings regarding different subsequent filling and cut-and-fill mining methods. The proposed FCM provides a feasible alternative with economic and environmental benefits.

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用于水泥浆回填的高粉煤灰含量凝胶材料的水化和硬化性能。
随着越来越多的矿山采用水泥浆回填(CPB)采矿法,降低回填成本和碳足迹的需求日益增加,而且变得越来越重要。在这项工作中,提出了一种用 40 wt.% 的劣质 F 级粉煤灰(FCM)制成的新型回填凝胶粘结剂,以取代普通硅酸盐水泥(OPC)。通过 X 射线衍射、水银渗入孔隙测定法、单轴压缩和热重分析,对粘结剂的水化和凝胶硬化性能进行了实验研究。使用了三种不同的矿山尾矿来验证 FCM 的适用性。结果表明,FCM-CPB 的强度性能是 OPC-CPB 的 72%,而 FCM 的生产成本几乎不到 OPC 的一半。FCM-CPB 的水化过程可分为五个阶段,主要的水化产物是埃特林岩和凝胶状水合物。28 天固化时,FCM-CPB 的孔隙率为 31.2%,高于 7 天固化时的孔隙率,但平均孔径更小,结构更致密。FCM 可满足三种不同矿山尾矿对不同后续充填和切填采矿方法的强度要求。拟议的 FCM 提供了一种具有经济和环境效益的可行替代方案。
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来源期刊
Gels
Gels POLYMER SCIENCE-
CiteScore
4.70
自引率
19.60%
发文量
707
审稿时长
11 weeks
期刊介绍: The journal Gels (ISSN 2310-2861) is an international, open access journal on physical (supramolecular) and chemical gel-based materials. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the maximum length of the papers, and full experimental details must be provided so that the results can be reproduced. Short communications, full research papers and review papers are accepted formats for the preparation of the manuscripts. Gels aims to serve as a reference journal with a focus on gel materials for researchers working in both academia and industry. Therefore, papers demonstrating practical applications of these materials are particularly welcome. Occasionally, invited contributions (i.e., original research and review articles) on emerging issues and high-tech applications of gels are published as special issues.
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