Sulfate resistance of cementitious systems with mineral additives

Dilek, Faruk Tuncer
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 of hydration products were studied with X-ray diffraction method and scanning electron microscopy at certain ages. In the experimental program, three laboratory produced cements, which have different C3A contents, were used together with standard sand in preparing the mortar mixtures. Mineral additives, depending on type of additive, were mixed in different replacement ratios with cements. Consequently, structure of hydration products at different ages, then- relative sulfate resistance was studied and some limitations and mathematical relations to estimate sulfate resistance were proposed.


Compressive strength development of calcium aluminate cement-GGBFS blends
Kirca, Onder; Yaman, İsmail Özgür; Tokyay, Mustafa (2013-01-01)
The compressive strength development of calcium aluminate cement (CAC) and ground granulated blast furnace slag (GGBFS) blends that were subjected to different curing regimes are investigated. The blends had GGBFS/CAC ratios between 0% and 80%, by mass. Mortar specimens, prepared with a water:binder:sand ratio of 1:2:6, were subjected to seven different curing regimes and the compressive strengths were monitored up to 210 days. In order to understand the effect of temperature on compressive strength develop...
BUTTINELLI, D; LAVECCHIA, R; POCHETTI, F; Geveci, Ahmet; GURESIN, N; Topkaya, Yavuz Ali (1992-10-01)
A composite mixture of three typical Cu/Zn complex ores, namely black-, yellow- and altered-ore, from Cayeli deposit in Turkey, was used for leaching experiments under atmospheric pressure in ferric sulphate solutions, In order to study the reaction kinetics of the copper and zinc dissolution in the temperature range from 50 to 80-degrees-C; also in the presence of a solvent for elemental sulphur, such as CCl4.
Influence of mineral admixture type and amount on rheological properties of mortars
Idrees, Maria; Tokyay, Mustafa; Department of Civil Engineering (2016)
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 minera...
Mineral katkılı çimentolu sistemlerin sülfata dayanıklılığı
Tokyay, Mustafa; Dilek, Tuncer(2003-01-01)
Kireçtaşı, tras, yüksek fırın cürufu ve uçucu kül içeren harçların sülfat direnci ASTM C 1012 deney metodu ile değerlendirilmiştir. Prizmatik ve kübik harç numuneleri yoğun sodyum sülfat ve sodyum + magnezyum sülfat karışım eriyikleri içerisinde bekletilmişlerdir. Numunelerin göreceli yıpranmaları boy değişimi, ağırlık değişimi, mukavemet ve görsel yıpranma yöntemleri ile izlenmiştir. Benzer karışımlardan, çimento hamuru numuneleri hazırlanmış ve hidratasyon ürünlerinin yapısı/morfolojisi X-ışmı kırılma yön...
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
F. T. Dilek, “Sulfate resistance of cementitious systems with mineral additives,” Ph.D. - Doctoral Program, Middle East Technical University, 2002.