{"title":"Microbial-induced carbonate precipitation (MICP) modified biochar for low-carbon cementitious materials","authors":"","doi":"10.1016/j.conbuildmat.2024.138644","DOIUrl":null,"url":null,"abstract":"<div><div>To foster sustainable construction, biochar has gained prominence as a filler or aggregate in concrete to mitigate carbon emissions. However, relatively weak strength of porous biochar is often a limitation. To improve the performance of biochar-containing matrices, this study proposed microbial-induced carbonate precipitation (MICP) for pore densification and surface modification of biochar. The MICP-modified biochar was employed as a filler to assess its mechanical performance, hydration processes, and microstructural characteristics. Our findings indicate that MICP modification of biochar yielded a more homogeneous and effective filler by enhancing the hydration rates, elevating the mechanical properties, and increasing the matrix compatibility. These improvements could be attributed to the increased compactness of MICP-modified biochar and its role in regulating the formation of an ettringite shell structure. As a result, the ettringite content was doubled surrounding the MICP-modified biochar. This study sheds light on the potential of MICP-modified biochar to actively participate in the regulation of hydration products for producing low-carbon construction materials.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":null,"pages":null},"PeriodicalIF":7.4000,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Construction and Building Materials","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0950061824037863","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
To foster sustainable construction, biochar has gained prominence as a filler or aggregate in concrete to mitigate carbon emissions. However, relatively weak strength of porous biochar is often a limitation. To improve the performance of biochar-containing matrices, this study proposed microbial-induced carbonate precipitation (MICP) for pore densification and surface modification of biochar. The MICP-modified biochar was employed as a filler to assess its mechanical performance, hydration processes, and microstructural characteristics. Our findings indicate that MICP modification of biochar yielded a more homogeneous and effective filler by enhancing the hydration rates, elevating the mechanical properties, and increasing the matrix compatibility. These improvements could be attributed to the increased compactness of MICP-modified biochar and its role in regulating the formation of an ettringite shell structure. As a result, the ettringite content was doubled surrounding the MICP-modified biochar. This study sheds light on the potential of MICP-modified biochar to actively participate in the regulation of hydration products for producing low-carbon construction materials.
期刊介绍:
Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged.
Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.