影响从拆迁废料中提取的水洗再生砂的 MICP 稳定性的因素

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Amir Sina Fouladi, Arul Arulrajah, Jian Chu, Annan Zhou, Suksun Horpibulsuk
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引用次数: 0

摘要

微生物诱导碳酸钙沉淀法(MICP)是生物化学领域公认的环保方法,在提高土壤工程特性方面具有巨大潜力。本研究调查了微生物诱导碳酸钙沉淀法在稳定从建筑和拆除废物中提取的水洗再生砂(RS)方面的可行性,这为提高土壤工程特性提供了巨大潜力,并使本研究与可持续废物管理实践相一致。通过精心设计的实验室实验,本研究考察了微观和宏观生物矿化过程,以评估稳定 RS 的可行性和影响因素。实验设置评估了固化介质浓度、环境温度、处理周期和固化时间对 MICP 处理 RS 效率的影响。研究结果表明,最佳的 MICP 条件是固结介质浓度为 0.5 mol/L,环境温度为 30 °C,此外,多达 12 个处理周期可将 RS 的无侧限抗压强度(UCS)显著提高到 724 kPa。此外,与 MICP 稳定的 RS 初始强度相比,延长固化时间可使 UCS 提高 28%。通过扫描电子显微镜和 X 射线衍射分析,可以深入了解有助于 RS 生物稳定的微观结构和矿物学转变。这项研究强调了经 MICP 处理的 RS 用作土工材料的有效性,强调了其环境和实际效益,并进一步提倡可持续地使用 MICP 来对建筑活动中的 RS 进行生物稳定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Factors affecting the MICP stabilization of washed recycled sands derived from demolition wastes

Factors affecting the MICP stabilization of washed recycled sands derived from demolition wastes

Microbially induced calcium carbonate precipitation (MICP) is recognized as an eco-friendly approach in biological chemistry, offering significant potential for enhancing soil engineering properties. This study investigates the viability of MICP for stabilizing washed recycled sands (RS) sourced from construction and demolition wastes, offering significant potential for enhancing soil engineering properties and aligning this research study with sustainable waste management practices. Through meticulously designed laboratory experiments, this research examined the micro and macro biomineralization processes to assess the feasibility and factors influencing RS stabilization. The experimental setup evaluates the impact of cementation media concentration, ambient temperature, treatment cycles, and curing time on MICP-treated RS efficiency. The findings indicate that the optimal MICP conditions can be found at a cementation media concentration of 0.5 mol/L, an ambient temperature of 30 °C, and furthermore, up to 12 treatment cycles can significantly enhance the unconfined compressive strength (UCS) of RS to 724 kPa. In addition, extending the curing time results in a 28% increase in UCS compared to the initial strength of MICP-stabilized RS. Analyses via scanning electron microscopy and X-ray diffraction provide insights into the microstructural and mineralogical transformations that aid the biostabilization of RS. This research underscores the effectiveness of MICP-treated RS for usage as a geomaterial, emphasizing its environmental and practical benefits and furthermore advocates the sustainable usage of MICP for the biostabilization of RS for construction activities.

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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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