The Effect of Biochar on Properties of Sulphate Resisting Concrete

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Lecture Notes in Civil Engineering


Concrete is globally the most used material and the cement industry has contributed to 8% of global emissions. To address climatic targets, supplementary cementitious materials (SCM) from waste products have been presented as a partial cement replacement. By doing so, a double benefit is presented, there is a reduction of waste stored and dumped on landfills and the reduction of the amount of cement required; thus, mitigating the environmental impact. One of the products that could potentially satisfy the sustainability criteria is biochar. This study evaluates the integration of biochar and sulphate resisting cement and assesses their interactions. This project utilizes palm tree wood waste biochar as 0.5 and 1% cement replacements compared to a reference mix at ages of 3, 7, and 28 days. Additionally, slump tests were conducted to assess workability. It was noticed that the minimal addition of biochar showed an enhancement to both strength and workability, indicating a potential for practical applications and on-site utilization. However, increasing cement replacement to 1% negatively affected compressive strength. Finally, further studies are essential before any practical recommendations can be made, especially when different combinations of supplementary cementitious materials are used.

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