Comparative Study of Finely Ground Fired Clay Brick and Kaolin Based Fillers in Autoclaved Calcium Silicate Based Building Products

Concrete institute of Australia
Publication Type:
Journal Article
Concrete Forum, 2009, 2 (1), pp. 25 - 28
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The process of hydrothermal curing or autoclaving is particularly well suited to the utilisation of industrial by-products in the production of construction materials as it renders some of these waste materials highly reactive. Research fi ndings have demonstrated that when used in combination with Portland cement (OPC) in the industrially important CaO-Al2O3-SiO2-H2O system, fi nely ground fi red clay brick masonry, an aluminosilica rich waste, is suitable for the production of autoclaved construction materials. Th e use of kaolin clay as a fi ller in the production of these autoclaved calcium silicate based building products is well established. Th is paper presents a comparative study of fi nely ground clay brick industrial waste and kaolin clay used in combination with OPC under autoclaved conditions. Th e observed variations in compressive strength are discussed in the context of the presence of critical phases, which were characterised by microstructural and thermal analytical methods.
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