碱活化粉煤灰胶结膏体充填体的输送性能、机械强度及微观结构特征

IF 4.3 3区 工程技术 Q2 ENERGY & FUELS
Ming Li, Qihang Li, Xingang Li, Shenyang Ouyang, Zuo Sun, Hongzeng Li, Rui Li
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引用次数: 0

摘要

粉煤灰广泛应用于水泥膏体充填材料的制备,但其水泥替代率受其水化程度的限制。通过出料率试验、坍落度试验、单轴抗压强度试验、扫描电镜(SEM)和x射线衍射(XRD)等测试手段,对制备的碱活化fa -胶结膏体充填体(AAF-CPB)的输送性能、机械强度和微观结构特征进行了研究。结果表明:制备的AAF-CPB出胶率范围为1.05% ~ 6.96%,坍落度范围为162 ~ 218 mm,早期强度范围为0.72 ~ 2.63 MPa,最终强度范围为3.28 ~ 10.68 MPa;浆料浓度、煤矸石粒径、FA替代率、粘结剂-煤矸石(B-CG)比对放血速率有显著影响;料浆浓度对坍落度也有显著影响;料浆浓度对AAF-CPB的早期强度影响显著,对最终强度影响不显著,而FA替代率对最终强度的影响大于早期强度。当FA替代率为30%时,AAF-CPB的最终强度显著提高。实验得到的AAF-CPB最佳配比为料浆浓度84%,脉石粒径0 ~ 5 mm, B-CG比0.8,FA替代率30%,氢氧化钠浓度CNaOH为0.6 mol·L−1。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Conveying Performance, Mechanical Strength, and Microstructural Characteristics of Alkali-Activated Fly Ash-Cemented Paste Backfill

Conveying Performance, Mechanical Strength, and Microstructural Characteristics of Alkali-Activated Fly Ash-Cemented Paste Backfill

Fly ash (FA) is widely used in the preparation of cement paste backfill material, but its cement substitution rate is limited by its degree of hydration. In this study, the conveying performance, mechanical strength, and microstructural characteristics of the prepared alkali-activated FA-cemented paste backfill (AAF-CPB) were investigated through bleeding rate tests, slump tests, uniaxial compressive strength tests, scanning electron microscopy (SEM), and X-ray diffraction (XRD). The results show that the bleeding rate range of the prepared AAF-CPB is 1.05%−6.96%, the slump is 162–218 mm, the early strength range is 0.72–2.63 MPa, and the final strength range is 3.28–10.68 MPa; the slurry concentration, gangue particle size, FA replacement rate, and binder-coal gangue (B-CG) ratio have a significant impact on the bleeding rate; slurry concentration also has a significant impact on slump; slurry concentration has significant effects on early strength and less significant effects on final strength of the AAF-CPB, while FA replacement rate has a higher impact on its final strength than early strength. When FA replacement rate is 30%, final strength of the AAF-CPB can be improved significantly. The optimal ratio of the AAF-CPB obtained from the experiment should be slurry concentration of 84%, gangue particle size of 0–5 mm, B-CG ratio of 0.8, FA replacement rate of 30%, and sodium hydroxide concentration CNaOH of 0.6 mol·L−1.

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来源期刊
International Journal of Energy Research
International Journal of Energy Research 工程技术-核科学技术
CiteScore
9.80
自引率
8.70%
发文量
1170
审稿时长
3.1 months
期刊介绍: The International Journal of Energy Research (IJER) is dedicated to providing a multidisciplinary, unique platform for researchers, scientists, engineers, technology developers, planners, and policy makers to present their research results and findings in a compelling manner on novel energy systems and applications. IJER covers the entire spectrum of energy from production to conversion, conservation, management, systems, technologies, etc. We encourage papers submissions aiming at better efficiency, cost improvements, more effective resource use, improved design and analysis, reduced environmental impact, and hence leading to better sustainability. IJER is concerned with the development and exploitation of both advanced traditional and new energy sources, systems, technologies and applications. Interdisciplinary subjects in the area of novel energy systems and applications are also encouraged. High-quality research papers are solicited in, but are not limited to, the following areas with innovative and novel contents: -Biofuels and alternatives -Carbon capturing and storage technologies -Clean coal technologies -Energy conversion, conservation and management -Energy storage -Energy systems -Hybrid/combined/integrated energy systems for multi-generation -Hydrogen energy and fuel cells -Hydrogen production technologies -Micro- and nano-energy systems and technologies -Nuclear energy -Renewable energies (e.g. geothermal, solar, wind, hydro, tidal, wave, biomass) -Smart energy system
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