出版社：Niğde Üniversitesi Mühendislik Fakültesi Dekanlığı
摘要：Prior to the invention of Portland cement, mineral admixtures had been used by blending with calcium hydroxide in the production of mortar mixtures. Today, since the mineral admixtures are economic and ensure useful alterations in some properties of fresh and hardened concrete and mortar, they have been used with Portland cement. In this study, the strengths of cement mortars containing high calcium fly ash and sodium sulfate (Na 2 SO 4 ) as activator were examined. While fly ash was used at 10%, 20%, 30% and 40% replacement by weight of cement, sodium sulfate was used 2% and 4% by mass of binder. The mortar mixture proportions were 1:2.75:0.485 by weight of cement, sand and water, respectively. The effects of addition of sodium sulfate into cement mortars were investigated through the porosity, compressive and flexural strength tests at 3, 7, 28 and 90 days. The findings showed that fly ash could be used in the cement mortars up to 20% replacement ratio, and that the early term strength losses could be compensated by using 2% sodium sulfate in the mixture. Keywords: Fly ash, mortar, compressive strength, flexural strength
