利用细菌生物矿化增强三维打印混凝土的层间键合

IF 13.1 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Amardeep Singh , Kamal Anand , Qiong Liu , VivianW.Y. Tam , Shweta Goyal , M. Sudhakara Reddy
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引用次数: 0

摘要

微生物诱导碳酸钙沉淀(MICCP)在提高3D打印混凝土(3DPC)的力学性能和耐久性方面显示出相当大的前景。本研究旨在评估为工业用途设计的即用型粉煤灰细菌接种物的现场适用性,目的是增强层间凝聚力,同时减少对环境的影响。研究人员进行了全面的测试,包括直接和分裂拉伸测试,以及微观结构分析,包括扫描电子显微镜(SEM)、x射线衍射(XRD)、热重分析(TGA)、傅里叶变换红外光谱(FT-IR)、3D数字图像相关(3D DIC)和汞侵入孔隙度测定(MIP)。测试是在两个系列的标本上进行的。结果表明,在印刷和固化过程中加入营养物质补充的营养液(NB)可以显著提高机械性能。富铌水经NB处理和固化后,ⅰ组的劈裂抗拉强度和直接抗拉强度分别提高422.21%和509.25%。进一步的SEM分析发现,nb处理后的试样形成了3 ~ 7 μm的方解石片层状方解石晶体,XRD分析证实nb处理后的试样方解石含量较高。TGA结果表明方解石的形成增加,而MIP分析显示处理后的样品孔隙率降低,孔隙结构更精细。这些发现证实了MICCP使用现场可部署细菌解决方案的有效性,为可持续3D混凝土打印的可扩展应用铺平了道路。未来的研究应进一步优化野外部署和细菌菌株对不同环境条件的适应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhancing interlayer bonding in 3-dimensional printed concrete using bacteria-based biomineralization
Microbially induced calcium carbonate precipitation (MICCP) has demonstrated considerable promise in enhancing the mechanical properties and durability of 3D printed concrete (3DPC). This study aims to assess the on-site applicability of a ready-to-use, fly ash-based bacterial inoculum designed for industrial use, with the objective of enhancing interlayer cohesion while reducing environmental impact. A comprehensive testing regime was conducted, encompassing direct and splitting tensile tests, in conjunction with microstructural analyses, including Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), Thermogravimetric Analysis (TGA), Fourier Transform Infrared Spectroscopy (FT-IR), 3D Digital Image Correlation (3D DIC), and Mercury Intrusion Porosimetry (MIP). The testing was conducted across two series of specimens. The findings indicate that the incorporation of nutrient broth (NB) supplemented with nutrients during the printing and curing process led to a substantial enhancement in mechanical performance. Specimens treated NB and cured NB-enriched water showed an increase in splitting tensile strength and direct tensile strength of 422.21 % in Series I and 509.25 % in Series II. Further analysis via SEM revealed the formation of lamellar rhombohedral calcite crystals (3–7 μm), and XRD confirmed greater calcite content in NB-treated specimens. TGA results indicated increased calcite formation, while MIP analysis revealed reduced porosity and more refined pore structures in treated specimens. These findings confirm the effectiveness of MICCP using a field-deployable bacterial solution, paving the way for scalable applications in sustainable 3D concrete printing. Future studies should investigate further optimization for field deployment and adaptation of bacterial strains to varying environmental conditions.
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来源期刊
Cement & concrete composites
Cement & concrete composites 工程技术-材料科学:复合
CiteScore
18.70
自引率
11.40%
发文量
459
审稿时长
65 days
期刊介绍: Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.
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