Upcycling rice husk biochar into carbon-negative composites

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-02-25 DOI:10.1016/j.conbuildmat.2025.140459

Gang Huang , Yan Xia , Yue Liu , Huanyu Li , Yuying Zhang , Liang Chen , Lei Wang , Jianhua Yan

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引用次数: 0

Abstract

Rice husk biochar (RHB), derived from pyrolyzed agricultural waste rice husk, is rich in carbon and silicon. RHB has a porous structure and possesses a certain degree of pozzolanic reactivity. In this study, RHB pyrolyzed at various temperatures were recycled into cement-based composites. The Frattini test results showed that RHB pyrolyzed at 700 °C exhibited the highest pozzolanic reactivity, resulting in the highest hydration degrees as well as the highest compressive strength of RHB-incorporated cement materials. These enhancements were attributed to the fact that RHB in the cement-based composites performed pozzolanic reactivity, as well as internal curing effect, which was beneficial to the hydration reactions of cement. Nanoindentation and morphologic analyses revealed a substantial accumulation of hydration products in the interfacial transition zone (ITZ), thereby improving micro-mechanical properties. Notably, the incorporation of 30 wt% RHB could produce carbon-negative cement composites with compressive strength over 42.5 MPa. This study elucidated the role of silicon-rich RHB in cement hydration and provided the theoretical foundation for the high-dose use of biochar in sustainable construction materials, advancing carbon-neutrality objectives in the construction sector.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

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.