Abstract
The enhanced carbon footprint of the construction sector has created the need for CO2 emission control and mitigation. CO2 emissions in the construction sector are influenced by a variety of factors, including raw material preparation, cement production, and, most notably, the construction process. Thus, using biobased constituents in cement could reduce CO2 emissions. However, biobased constituents can degrade and have a negative impact on cement performance. Recently, carbonised biomass known as biochar has been found to be an effective partial replacement for cement. Various studies have reported improved mechanical strength and thermal properties with the inclusion of biochar in concrete. To comprehend the properties of biochar-added cementitious materials, the properties of biochar and their effect on concrete need to be examined. This review provides a critical examination of the mechanical and thermal properties of biochar and biochar-added cementitious materials. The study also covers biochar’s life cycle assessment and economic benefits. Overall, the purpose of this review article is to provide a means for researchers in the relevant field to gain a deeper understanding of the innate properties of biochar imparted into biochar-added cementitious materials for property enhancement and reduction of CO2 emissions.
Highlights
The proper mixing ratio of biochar cement mixture should be maintained during processing, as this may affect the rheological properties of the mixture, which directly contributes to poor bonding and lower strength
This review provides information about the thermal and mechanical properties of biochar and biochar-added cementitious materials
In comparison to ash and other biobased constituents, biochar has a high potential as an additive material in cement
Summary
China is the world’s leading cement producer, accounting for half of global cement production; it is no surprise that China reported 823 million metric tonnes of CO2 emissions in 2019 [7] This increasing rate necessitates the development of strategies to limit CO2 emissions in the cement manufacturing industries. CO2 emissions from the cement manufacturing sectors whilst retaining cement’s performance These strategies include changes in raw materials, new production equipment, fuel alterations, etc. In ash-based constituents, the presence of organic and inorganic impurities depletes the cement’s properties [36,37] Converting these biobased constituents to biochar is an efficient method because biochar is sustainable, eco-friendly, contributes to CO2 reduction, and has excellent thermal and mechanical properties [38]. This review sheds light on the research gap and can be used to gain a better understanding of the science underlying the mechanical and thermal performance of biochar-added cementitious materials
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