Performance of Autoclaved Aerated Concrete (AAC) Containing Recycled Ceramic and Gypsum Waste as Partial Replacement for Sand

Abstract

Today, municipal solid waste (MSW), noise pollution and fire attack are three ongoing issues for inhabitants of urban including in Malaysia. To solve these issues, an eco-friendly autoclaved aerated concrete (AAC) containing recycled ceramic and gypsum waste (CGW) as partial replacement for sand with different ratios (0%, 5%, 10%, 15%, 20% and 25% wt) have been prepared. The work density (r_w) and mechanical properties of samples such as compressive strength (f_c) and specific strength (S) have been investigated. The functional properties of samples such as sound absorption coefficient (SAC) and direct fire resistance also have been carried out. All samples showed normal color behavior i.e. grey and free crack with a r_w was in the range of 593.71 kg/m³ to 605.29 kg/m³. The f_c increased in the range of 6.10% to 29.88%. The maximum value of f_c was 2.13 MPa for 15% wt of CGW. The SAC of samples at low frequency (500 Hz) is higher than reference sample (RS). All AAC-CCW samples are categorized as material class B and C absorbers at frequency 500 Hz. Except for RS, the fire resistance results showed the physical surface of the samples had free crack and not burned during direct fire at 950°C for 300 s. The results showed that CGW have positive effect on the mechanical and functional properties of AAC.