Influence of Metastable Hydrated Phases on the Pore Size Distribution and Degree of Hydration of MK-Blended Cements Cured at 60 °C

Metakaolin (MK) is an excellent pozzolan, which can be added to concrete for productivity. When MK reacts with calcium hydroxide, cementitious products, including CSH, C2ASH8 and C4AH13, are formed. Some of these (C2ASH8 and C4AH13) are metastable phases, converting to hydrogarnet (C3ASH6) for long curing times at elevated temperatures. This could result in a negative effect on the performance and durability of blended cements, due to a volume decrease associated with the process of transformation. This article reports on a study of blended cements containing 10%, 20% and 25% of MK, cured at 60 °C up to 124 days of hydration. The results show no increase in porosity values and average pore diameters with time. The authors conclude that the hydrated phases produced in MK-blended cements under the test conditions used do not have a negative effect on the microporosity. They briefly discuss the correlation between porosity and degree of hydration.

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  • Authors:
    • Rojas, Moisés Frías
    • de Rojas, MI Sánchez
  • Publication Date: 2005-7

Language

  • English

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Filing Info

  • Accession Number: 01002287
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 21 2005 1:42PM