Eco-efficient recycling of engineering muck for manufacturing low-carbon geopolymers assessed through LCA: exploring the impact of synthesis conditions on performance

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Bingxiang Yuan, Jingkang Liang, Xianlun Huang, Qingyu Huang, Baifa Zhang, Guanghua Yang, Yonghong Wang, Junhong Yuan, Hongyu Wang, Peng Yuan
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Abstract

With the push toward global low-carbon and sustainable development goals, an urgent need exists to find building materials that can replace cement. Engineering muck (EM) produced by foundation pit engineering in subtropical areas is rich in clay minerals, which are suitable for the preparation of low-carbon geotechnical materials. In this study, the effects of SiO2/Na2O and the liquid–solid ratio on the performance of alkali-activated EM-based geopolymers were investigated. In addition, a life cycle assessment (LCA) was performed to evaluate the environmental impacts of EM-based geopolymers. The findings showed that the geopolymer with a SiO2/Na2O ratio of 1.5 achieved the highest 7-day compressive strength of 42 MPa, which was 47.46% and 56.49% greater than that of the geopolymer with SiO2/Na2O ratios of 0.9 and 1.8, respectively because of its densest structure and fewest cracks. Moreover, increasing the liquid–solid ratio from 0.75 to 0.90 slightly increased the 28-day compressive strength from 47 to 52 MPa because of the refined pore structure. However, this modification also increased carbonate formation and mass loss at elevated temperatures. Compared with those of concrete, the CO2 and SO2 emissions of EM-based geopolymers were reduced by 4–26% and 8–19%, respectively, owing to the considerable environmental impact of cement. The overall performance of the geopolymers was assessed via multiple influence indicator methods, and the optimal synthesis conditions for the geopolymers were a SiO2/Na2O ratio of 1.5 and a liquid–solid ratio of 0.75. This study suggests that using alkaline activation technology to transform EM into geopolymers has potential as a substitute for concrete, providing a new type of green material for geotechnical engineering.

Abstract Image

通过生命周期评估评估制造低碳土工聚合物的工程淤泥的生态效率循环利用:探索合成条件对性能的影响
随着全球低碳和可持续发展目标的推进,迫切需要找到可以替代水泥的建筑材料。亚热带地区基坑工程产生的工程泥浆(EM)富含粘土矿物,适合制备低碳岩土材料。本研究调查了 SiO2/Na2O 和液固比对碱激活 EM 基土工聚合物性能的影响。此外,还进行了生命周期评估(LCA),以评价 EM 基土工聚合物对环境的影响。研究结果表明,SiO2/Na2O 比率为 1.5 的土工聚合物的 7 天抗压强度最高,达到 42 兆帕,比 SiO2/Na2O 比率为 0.9 和 1.8 的土工聚合物分别高出 47.46% 和 56.49%,因为其结构最致密,裂缝最少。此外,由于细化了孔隙结构,液固比从 0.75 提高到 0.90 稍微提高了 28 天抗压强度,从 47 兆帕提高到 52 兆帕。然而,这种改性也增加了碳酸盐的形成和高温下的质量损失。与混凝土相比,基于 EM 的土工聚合物的二氧化碳和二氧化硫排放量分别减少了 4-26% 和 8-19%,这是因为水泥对环境的影响相当大。通过多种影响指标方法评估了土工聚合物的整体性能,结果表明土工聚合物的最佳合成条件为 SiO2/Na2O 比为 1.5,液固比为 0.75。这项研究表明,利用碱性活化技术将电磁转化为土工聚合物具有替代混凝土的潜力,为岩土工程提供了一种新型绿色材料。
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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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