The Effect of Diatomite Addition on Fly Ash Based Geopolymer Mortars on Thermal Conductivity Values

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In this study, the effects of diatomite addition on F class fly ash based geopolymer mortars were investigated. Thermal conductivity coefficient, ultrasound transmission rate, split tensile strength and unit weight properties of diatomite addition geopolymer mortars were investigated. In addition, FESEM examinations were made on the microstructure of geopolymer paste. In the samples produced in the study, the water / binder ratio by weight was determined as 0.31 and the sand / binder ratio as 3.0. Sodium hydroxide (NaOH) was selected as the activator and used to contain 10 % by weight of Na+ relative to the binder material. Diatomite was replaced with binder by weight basis at the rations of 1%, 2%, 3%, 4% and 5% in the mixtures. The produced geopolymer mortars were head cured at 90°C in a furnace for 24 hours. As a result, diatomite addition at the rate of 1%, 2%, 3% provided the formation of a more compact geopolymer, while the diatomite substitution at 4% and 5% caused a more porous structure. In parallel, the lowest thermal conductivity coefficient was obtained with 5% diatomite addition, while the highest splitting strength was obtained with 3% diatomite substitution. In addition, it has been concluded that there is a high linear relationship between thermal conductivity coefficient and ultrasonic transmission speed (R = 0.9275), splitting strength (R = 0.9645) and unit weight (R = 0.9327) in diatomite addition geopolymer mortars.

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Geopolymer mortarFly ashDiatomiteThermal conductivityHeat curing

Erciyes University Journal Of The Institute Of Science an‎d Technology

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Erciyes University Journal Of The Institute Of Science an‎d Technology