Hydration behavior and strength development of mineral admixture incorporated calcium aluminate cements

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2018

Öğrenci: KADİR CAN ERKMEN

Danışman: MUSTAFA TOKYAY

Özet:

Calcium aluminate cements (CACs) have very high early strength and high early heat evolution. On the other hand, at relatively high ambient temperatures and humidity the hydration products may convert into other products of lower binding value and porous structure which result in lower strength at later ages. In order to prevent such strength losses mineral admixtures such as ground granulated blast furnace slag and fly ash may be incorporated in CACs. In this respect, the main goal of this study was to obtain mechanically stable binder combinations by incorporating these mineral admixtures into CAC. The effects of these mineral admixtures on the hydration process and strength development of CAC blended cement pastes and mortars at different curing temperatures were investigated through calorimetry, XRD and strength tests. The hydration reactions found to be happening significantly faster at elevated temperatures. The presence of a sufficient amount of GGBFS in the blends at different curing temperatures proved to be helpful in terms of hindering strength losses, however there is not such a clear effect observed in fly ash containing binders.