Akademik Veri Yönetim Sistemi
JOURNAL OF THE AUSTRALIAN CERAMIC SOCIETY, cilt.59, sa.4, ss.1053-1063, 2023 (SCI-Expanded)
Evaluating the use of waste products and creating environmentally friendly composites are among the leading issues today. Geopolymers have an important role in making use of waste materials. In order to investigate the usability of volcanic tuff wastes in the production of geopolymer composites, two different tuffs and calcined types of these tuffs were used. Many researchers have studied geopolymers containing metakaolin, but geopolymers containing volcanic tuffs are very limited. This study will contribute to the limited issue in the literature and more effective use of waste volcanic tuffs that cause environmental pollution will be contributed. This study produced a lightweight geopolymer using two different natural pozzolans. The calcination effect was investigated by calcining the two pozzolans used at 800 degrees C for 3 h. 48 lightweight geopolymer composites were produced using normal and calcined volcanic tuffs by using two different amounts of activator (NaOH + Na2SiO3), two different activator ratios (NaOH/Na2SiO3) and three different expanded polystyrene (EPS) ratios. Density, water absorption, compressive strength, compressive strength changes after elevated temperature, XRD and FT-IR test results were examined. While the highest strength was determined as 34 MPa in Tuff-1 mixtures in normal tuff samples, it was measured as approximately 57 MPa in Tuff-2 mixtures after calcination. The densities of the samples produced by calcined tuff were higher, and the water absorption ratios were lower. As a result of calcination, there were differences in the morphological structure and bonds formed based on the XRD and FT-IR graphics.