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EFFECT OF TEMPERATURE ON THE STRUCTURE AND STRENGTH PROPERTIES OF CEMENT PASTES CONTAINING FLY ASH ALONE OR IN COMBINATION WITH LIMESTONE

Heikal, M

Ceramics (Praha), 2006-01, Vol.50 (3), p.167-177 [Periódico revisado por pares]

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  • Título:
    EFFECT OF TEMPERATURE ON THE STRUCTURE AND STRENGTH PROPERTIES OF CEMENT PASTES CONTAINING FLY ASH ALONE OR IN COMBINATION WITH LIMESTONE
  • Autor: Heikal, M
  • É parte de: Ceramics (Praha), 2006-01, Vol.50 (3), p.167-177
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: The effect of heat treatment on microstructure and phase composition of pastes containing fly ash (FA) and limestone (LS) was investigated. Two groups of cement pastes were prepared. In the first, Portland cement (OPC) was partially replaced by 10, 20 and 30 wt% FA (M.0, M.10, M.20, M.30). The second group of specimens contained samples derived from M.20, in which FA had been replaced by 5, 10, 15 and 20 wt% LS (L.5, L.10, L.15 and L.20). After 28 and 366 days of water curing, the hardened cement pastes were dried at 105 C for 24 h, subjected to thermal treatment for 3 h at 250, 450, 650 and 800 C, then cooled to room temperature in the switched off furnace. The compressive strength and weight loss were determined. SEM, DSC and XRD were used to identify the changes occurring in the microstructure of the formed or decomposed phases. The results show that additional hydration of unhydrated cement grains, recrystallisation, deformation and transformation of CSH phases had occurred. The changes in the physical state of cement pastes were studied by measuring deterioration in the compressive strength with temperature. 24 refs.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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