Differential scanning calorimetry evaluation of autoclaved cement based building materials made with construction and demolition waste

Publisher:
Elsevier Science
Publication Type:
Journal Article
Citation:
Thermochimica Acta, 2002, 389 (1-2), pp. 195 - 198
Issue Date:
2002-01
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The effect of adding finely ground construction and demolition (C&D) waste fines, containing a significant amount of clay-brick, to mixtures of Portland cement and quartz sand autoclaved at 180 °C was investigated by DSC. The incorporation of up to 41.25 mass% C&D waste fines enhanced the formation of aluminium-substituted tobermorite indicating that the mullite in the clay-brick fines is reactive under autoclaving conditions and supplied the aluminium required for the formation of this critical phase. C&D waste fine additions in excess of 41.25 mass% promoted the formation of aluminium-substituted CSH1 over aluminium-substituted tobermorite.
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