Hydration of Calcium Aluminate Phases at Different Temperatures

Jan Koplík; Libor Tomala; Radoslav Novotný

doi:10.4028/www.scientific.net/AMR.1000.24

Paper Titles

Potential Application of Belite Clinker
p.7

Preparation of Alternative Hydraulic Binder Based on Secondary Raw Materials
p.12

The Effect of Boron and its Compounds on Setting of Portland Cement
p.16

Combination of Various Admixtures as Partial Replacement for Portland Cement and the Influence on the Final Concrete Properties
p.20

Hydration of Calcium Aluminate Phases at Different Temperatures
p.24

Recycled Poly(Vinyl Butyral) Used as a Barrier to Prevent Mortar Carbonation
p.28

Testing of Surface Photoactivity of Fibre-Cement Composites
p.35

The Role of Metakaolin Fineness on Rheological Properties of Cement Pastes
p.39

The Influence of Zinc on the Hydration and Compressive Strength of Portland Cement
p.43

HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1000Hydration of Calcium Aluminate Phases at Different...

Hydration of Calcium Aluminate Phases at Different Temperatures

Abstract:

Mayenite (C₁₂A₇) and calcium dialuminate (CA₂) are both components of Calcium aluminate Cement (CAC). The hydration of these phases depends on initial conditions especially on the temperature. Pure phases were synthesized by solid-state reaction. The hydration was carried out at three different temperatures – 20 °C, 30 °C and 60 °C. The course of hydration was investigated by isothermal calorimetry. The results prove, that higher temperature increase reactivity of phases and decrease their initial period of hydration. The X-ray diffraction analysis (XRD) identified the hydration products of CA₂ as katoite (C₃AH₆) and gibbsite (AH₃). The hydration products of C₁₂A₇ depends on the temperature. At 20 °C the major products are C₂AH₈ and CAH₁₀. At 30 °C CAH₁₀ disappears and only C₂AH₈ remains. At 60 °C the only stable hydrates – C₃AH₆ and AH₃ are formed.