High-Temperature Resistance of Industrial Waste-Based Lightweight Geopolymer Mortars Produced Using Microwave Technology
Küçük Resim Yok
Tarih
2024
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer Heidelberg
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The production of microwave-cured lightweight geopolymers has been investigated; however, the durability properties of these materials, particularly the high-temperature resistance, remain an area requiring further investigation. This study examined the high-temperature resistance of fly ash- and brick powder-based lightweight geopolymer mortars. For this purpose, hydrogen peroxide (Hp) was used as a foaming agent at dosages of 0.5%, 1.0%, and 1.5% by the weight of aluminosilicate, and expanded polystyrene (EPS) beads were used as lightweight aggregate at dosages of 0.2%, 0.4%, and 0.8% by the weight of aluminosilicate. Curing was carried out using a conventional laboratory oven (90 degrees C for 48 h) and a household microwave oven at a power level of 300 watts (20 min for fly ash and 30 min for brick powder). Sodium silicate and sodium hydroxide were used as alkali activators, and pumice aggregate with a maximum particle size of 4.75 mm was utilized for mortar mixtures. The results showed that unit weights and compressive strengths decreased with the inclusion of Hp and EPS. While the oven-cured reference mortars lost strength after exposure to 1000 degrees C, the compressive strengths of mortars containing EPS and Hp increased. The compressive strength of all microwave-cured mortar series increased after high-temperature exposure. With the use of Hp and EPS, compressive strength increases of up to 373% were observed after exposure to 1000 degrees C. These strength increases were attributed to continued geopolymerization under the influence of high temperature and new crystal formations as evidenced by XRD analysis.
Açıklama
Anahtar Kelimeler
Foaming agent, High-temperature resistance, Lightweight aggregate, Lightweight geopolymer, Microwave curing
Kaynak
Arabian Journal for Science and Engineering
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
Sayı
Nov
Künye
Tokdemir, M., Ramyar, K., & Gultekin, A. (2024). High-temperature resistance of industrial waste-based lightweight geopolymer mortars produced using microwave technology. Arabian Journal for Science and Engineering (2011).
