Strength development in autoclaved blends made with OPC and clay-brick waste

This article reports findings on the strength development of autoclaved OPC-clay-brick blends, where a variety of clay-brick types were used. The strength variations are explained in terms of differences in chemical and mineralogical properties of clay-brick as well as the phases formed during autoclaving. An overall increase in strength was characteristic for 30-60 mass% for all clay-brick type additions. The optimum compressive strengths were achieved at 50 mass% clay-brick additions, where highly crystalline 1.1 nm tobermorite coexisted with “fibrous C-S-H”.