Compressive strength and thermal conductivity of concrete containing biochar and expanded clay aggregate
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Abstract
This paper investigates the compressive strength and thermal conductivity of concrete containing biochar and expanded clay aggregate. Hydraulic cement type GU was used as the main binder. Biochar produced from pyrolyzed rice husks was used to partially replace hydraulic cement at 1% and 3% by weight of total binder. Expanded clay aggregate was used to replace natural coarse aggregate at 25 and 50% by volume of coarse aggregate. The water-to-binder ratio of all concrete mixtures was kept at a constant value of 0.50. The experimental results found that biochar-based concrete had higher compressive strength than control concrete and concrete containing expanded clay aggregate. Concrete with 1% biochar by weight of total binder exhibited higher compressive strength than concrete with 3% biochar by weight of total binder. Meanwhile, the concrete using expanded clay aggregate demonstrated less thermal conductivity than the control concrete and the concrete incorporating biochar. The thermal conductivity decreased as the percentage of expanded clay aggregate increased. Furthermore, concrete containing biochar combined with expanded clay aggregate possessed a lower thermal conductivity than concrete having only expanded clay aggregate. This is because biochar and expanded clay aggregate were highly porous materials. As a result, it could reduce heat transfer inside the concrete.
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