Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.13091/4354
Title: Very high early strength calcium aluminate based binary and ternary cementitious systems: properties, hydration and microstructure
Authors: Saydan, Murat
Keskin, Ulku Sultan
Uzal, Burak
Keywords: Calcium aluminate cement
ternary systems
rapid strength mortar
dimensional stability
cement microstructure
Portland-Cement
Thermal-Stability
Nanometer Channel
Silica Fume
Fly-Ash
Sulfate
Ettringite
Stratlingite
Decomposition
Brecem
Publisher: Taylor & Francis Ltd
Abstract: Calcium aluminate cement (CAC) is a cement type that has superior properties 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 investigated 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 reactions, such as CAH(10), C(2)AH(8), 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 produce high amounts of ettringite. On the other hand, it is understood that the formation of stratlingite was limited strength decreases in systems where high silica fume is used.
Description: Article; Early Access
URI: https://doi.org/10.1080/19648189.2023.2220770
https://hdl.handle.net/20.500.13091/4354
ISSN: 1964-8189
2116-7214
Appears in Collections:Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections

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