This research focuses on the preparation of autoclaved aerated concrete (AAC) with construction waste as the main raw materials. The properties of dry density and compressive strength of AAC were tested to determine the optimum mix proportion of raw materials and the construction waste fineness. The results indicated that the optimum mix proportion of raw materials was consist of 55-65% construction waste, 15-21% cement and 18-22% quicklime, together with 2% gypsum and 0.1% aluminum powder, the construction waste was mechanically milled for 20 min, and cured in the conditions of autoclave pressure 1.5 MPa for 6 h, the compressive strength of AAC samples were higher than 5.0 MPa, and dry density value could reach 650-700 Kg/m3, which meet the requirements of A5.0 B07 grade in the Autoclaved aerated concrete blocks (GB11968-2006). The analysis of microstructure and phase compositions of the AAC samples showed that the tobermorite, calcite and CSH were formed in the process of autoclave curing, and CSH gels were combined through the skeletons formed by tobermorite crystals, the interconnected and porous microstructure contributed to the good properties of low density and high strength of AAC.
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