Influence of mineral admixture type and amount on rheological properties of mortars

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Tezin Türü: Doktora

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

Tezin Onay Tarihi: 2016

Öğrenci: MARIA IDREES

Danışman: MUSTAFA TOKYAY

Özet:

Fly ash (FA), silica fume (SF) and ground granulated blast furnace slag (BFS) are used in different amounts to partially replace portland cement (PC) on mass basis to prepare mortars mixtures with different water-binder ratios. In all mixtures, a constant amount of a polycarboxylate based high range water reducing admixture was used. The rheological measurements of fresh mortars were taken right after mixing and at 10 and 20 minutes after mixing by using a two-probe eBT2 rheometer. The effect of each mineral admixture amount on relative yield stress and relative viscosity of mortars were determined and compared with those of the control mixtures without any mineral admixture. General rheological behavior of these mixtures were determined and analyzed. Eight different flow models proposed by other researchers are checked for suitability to the experimental data obtained and a new model is proposed. The suitability of the proposed model was checked both for portland cement and mineral admixture-incorporated cement mortars and it was found to be a better model than all other models when compared to the other proposed models, so far.