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含有废氨碱渣和粉煤灰的生态可持续氯氧镁水泥浆体

Eco-Sustainable Magnesium Oxychloride Cement Pastes Containing Waste Ammonia Soda Residue and Fly Ash.

作者信息

Wang Qing, Huang Wenjie, Liang Yuhang, Li Congbo, Lai Mianheng, Sun Jing

机构信息

School of Civil Engineering, Guangzhou University, Guangzhou 510006, China.

出版信息

Materials (Basel). 2022 Aug 28;15(17):5941. doi: 10.3390/ma15175941.

DOI:10.3390/ma15175941
PMID:36079323
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9457515/
Abstract

Magnesium oxychloride cement (MOC), a type of special construction material, has drawn much research attention in solid waste utilization and environmental protection due to its eco-friendly production. Ammonia soda residue (ASR), a by-product generated from sodium carbonate manufacturing, is one of the industrial wastes that can be recycled in MOC systems. However, ASR exhibits adverse effects on the fresh performance and volume stability of MOC pastes. This paper aims at improving the properties of ASR-MOC by introducing fly ash (FA), solid waste from the power industry. Firstly, the roles of FA in MOC pastes are evaluated and analyzed. Then, three substitution ratios of FA (33.3%, 50% and 66.7% in weight) for ASR are designed for MOC pastes with 10% to 40% industrial wastes. Flowability, setting, strength and expansion of all mixtures were experimentally studied. Furthermore, X-ray diffraction (XRD) and scanning electron microscope (SEM) approaches were adopted to illustrate the microstructure changes. Results show that by adding different amounts of FA, the inferior flowability of MOC caused by ASR can be improved by 6-23%, the setting process can be prolonged by 30-55% and the expansion ratio can be reduced by 14-66%. The intensity of characteristic peaks of 5-phase and Mg(OH), together with the degrees of crystallization in XRD curves, well explain the strength variation and volume stability of ASR-MOC pastes. According to the regulation of relative specification, up to 20% of solid wastes in weight (10% FA + 10% ASR) can be consumed, contributing greatly to the greener sustainable development of construction materials.

摘要

氯氧镁水泥（MOC）是一种特殊的建筑材料，因其环保的生产方式，在固体废物利用和环境保护方面受到了广泛的研究关注。氨碱渣（ASR）是碳酸钠生产过程中产生的副产品，是可在MOC系统中回收利用的工业废料之一。然而，ASR对MOC浆体的新拌性能和体积稳定性有不利影响。本文旨在通过引入电力行业的固体废物粉煤灰（FA）来改善ASR-MOC的性能。首先，对FA在MOC浆体中的作用进行了评估和分析。然后，针对含有10%至40%工业废料的MOC浆体，设计了三种FA替代ASR的比例（重量比分别为33.3%、50%和66.7%）。对所有混合料的流动性、凝结时间、强度和膨胀性能进行了试验研究。此外，采用X射线衍射（XRD）和扫描电子显微镜（SEM）方法来说明微观结构的变化。结果表明，通过添加不同量的FA，由ASR导致的MOC较差的流动性可提高6%-23%，凝结过程可延长30%-55%，膨胀率可降低14%-66%。XRD曲线中5相和Mg(OH)特征峰的强度以及结晶度，很好地解释了ASR-MOC浆体的强度变化和体积稳定性。根据相关规范规定，最多可消耗20%（重量）的固体废物（10%FA+10%ASR），这对建筑材料更绿色的可持续发展有很大贡献。

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本文引用的文献

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