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

Idrees, Maria
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. 


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Sulfate resistance of mortars containing limestone, trass, granulated blast furnace slag and fly ash has been evaluated using ASTM C 1012 test procedure. Prismatic and cubic mortar specimens have been stored in concentrated sodium sulfate and a mixture of sodium sulfate + magnesium sulfate solutions. Relative deterioration of the specimens has been determined by length change, weight change, strength and visual examination. From similar mixtures, cement paste specimens were prepared and structure/morphology...
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Mutual activation of blast furnace slag and a high-calcium fly ash rich in free lime and sulfates
Sahin, Murat; Mahyar, Mahdi; Erdoğan, Sinan Turhan (2016-11-15)
Alkaline activation of fly ash and blast furnace slag has gained interest due to a desire to avoid Portland cement in mixtures. Outstanding mechanical performance and durability is reported, but often when the activator dosage is high which can have various negative environmental impacts that can overshadow the carbon reduction benefit. This study investigates the use of a ground slag, and a high-lime fly ash, rich in free lime and sulfates, to activate each other and render mortars which don't incorporate ...
Citation Formats
M. Idrees, “Influence of mineral admixture type and amount on rheological properties of mortars,” Ph.D. - Doctoral Program, Middle East Technical University, 2016.