New building material from waste concrete by carbonation

A new recycled material derived from waste concrete using a CO2-activated h ardening process is proposed. Waste autoclaved lightweight concrete powder was used as the starting material. The powder was mixed with water, compact ed by pressing, and cured in high CO, concentrations. The bending strength and the specific surface area of this hardened material increased as the de gree of carbonation was increased. The hardened material had a high moistur e absorption and desorption performance, suggesting potential application t o the interior wall having a moisture control function.