Derya TURHAN
Fatma Karagol
Rıza POLAT
Abstract
Due to the increasing CO2 emission resulting from cement production in recent years, researchs on the use of alternative binders to cement have increased and one of the most important binders have become geopolymer binders. Many different natural or waste materials are used as alumino-silicate sources in geopolymer production. In this study, the production of geopolymer concrete with perlite (a natural source of alumino-silicate) and red mud (a waste material) were investigated. Red mud was utilized at 10%, 20%, and 30% of the total mass of binder. In the mixtures, the solution/binder and NaOH/Na2SO3 ratios were selected as 0.50 and 1/1, and the produced samples were cured at 90°C for 72 hours. After heat curing, 3, 7, 28, and 90 days' compressive strengths of all mixtures were determined. In addition, the samples from each mixture were exposed to 5% HCl and 5% MgSO4 solutions, 50 freeze-thaw cycles according to ASTM C666/C666M standard Procedure A, and three different elevated temperatures (300°C, 500°C, and 700°C). After subjected to durability effects, the compressive strengths and weight losses of mixtures were identified. As a result, the compressive strengths of mixtures containing red mud are higher than those containing 100% perlite. However, in terms of durability, the compressive strength losses of mixtures containing red mud are higher than pure perlite.
Keywords
Geopolymer, Perlite, Red Mud, Elevated temperature, Acid effect, Sulfate effect, Freeze-thaw, Sustainability, Global warm
