Influence of MK on the reaction kinetics in MK/lime and MK-blended cement Systems at 20 deg C

摘要

Metakaolin (MK)/lime and MK-blended cement pastes are studied in samples stored and cured at 20 deg C and up to 360 days of hydration. The nature of the reaction products and their sequence of appearance are obtained from differential thermal analysis (DTA) and X-ray diffraction (XRD) techniques. The results show a different behavior of the pozzolanic reaction in both pastes. XRD data reveal the absence of crystalline phases in MK-blended cements up to 360 days of curing. MK shows high pozzolanic activity, which provides the quick formation of CSH, C_2ASH_8 (stratlingite), and C_4AH_(13) in MK/lime systems.