Microwave energy radiated biochar bonded-cement-clay bricks

This experimental study presents the findings on the prospects of using microwave radiation in the curing of novel clay bricks bonded with biochar and cement. The impact of the microwave energy on strength development using varied sample clay brick sizes was also considered. Linear shrinkage and compressive strength were determined while mineralogical composition, specific surface area and pore volume analysis were also performed. The optimum content of 1.5:1.5 of biochar:cement resulted least linear shrinkage. Compressive strength values increased by 9, 38 and 35% based on the sample sizes as the biochar and cement contents increased from 1 to 2%. Microwave energy was largely responsible for evaporation–condensation effects on larger sample sizes. The microwave-cured char-based clay bricks developed adequate strength that is within the range of specified standards and could offer a faster and less energy-intensive way of producing improved bricks.