Very high early strength calcium aluminate based binary and ternary cementitious systems: properties, hydration and microstructure

Abstract

Calcium aluminate cement (CAC) is a cement type that has superior prop-erties such as rapid strength gain, high resistance to high temperatures and harmful chemicals. However, the result of the using of CACs in the production of structural elements occur strength decreases at later ages as a result of a series of chemical reactions called ‘conversion reactions’ seen in these cements. In this study, the hydration kinetics and the crystalline and amorphous structures formed as a result of hydration were investi-gated in CAC containing different amounts and types of main oxides-based binary and ternary systems. Considering the results obtained, the main hydration product seen in these specimens was ettringite. Unlike many studies in the literature, metastable structures which cause conversion reac-tions, such as CAH10, C2AH8, have not been observed. Instead of conversion of the phases, ettringite needles were became thin and elongate which causes the paste structure porous and thus causing expansion and strength reduction at the later stages of hydration in some mixtures pro-duce high amounts of ettringite. On the other hand, it is understood that the formation of str€atlingite was limited strength decreases in systems where high silica fume is used.