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Investigation on early hydration of ternary Portland cement-blast-furnace slag–metakaolin blends

2014; Elsevier BV; Volume: 64; Linguagem: Inglês

10.1016/j.conbuildmat.2014.04.018

1879-0526

Martin Boháč, Martin Palou, Radoslav Novotný, Jiří Másilko, Dalibor Všianský, Theodor Staněk,

Magnesium Oxide Properties and Applications

The paper investigates the hydration of ternary blends comprising Portland cement, blast-furnace slag and metakaolin. The isothermal calorimetry and “in situ” X-ray diffraction was used to evaluate the effect of metakaolin and blast-furnace slag on the early hydration of blends. XRD, DTA and SEM were used to analyze the hardened paste after 1 month of hydration. Metakaolin influences significantly the kinetics, mechanism and products of hydration at initial period of hydration causing the rapid formation of ettringite. Hemicarbonate aluminate hydrate is formed as a product of ettringite conversion due to the presence of reactive calcite in Portland cement.