Topic
Geopolymer
About: Geopolymer is a research topic. Over the lifetime, 6776 publications have been published within this topic receiving 157991 citations. The topic is also known as: geopolymers.
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TL;DR: In this article, the authors compared the performance of the growing geopolymer gels with glass and sand as aggregates and showed that the higher extent of alkalinity that glass particles introduce to the system at the very beginning has an important impact on the hydration stage of the reaction.
97 citations
TL;DR: In this article, glass fines are used as a replacement for fine sand in manufacturing geopolymer foams and thermal and mechanical properties of the two systems with different densities are investigated.
97 citations
TL;DR: In this article, the compressive strength of fly ash-based geopolymer mortar (FBGM) made from five different sources of fly ashes was examined and the results indicated that the optimum AL/FA ratio for activating fly ash was in the range of 0.5 and 0.6.
97 citations
TL;DR: Results indicate that a geopolymer is effective at reducing the leach rates of many metals from the fly ash, such as calcium, arsenic, selenium, strontium and barium.
97 citations
TL;DR: A comparative study of the characteristic of unfoamed and foamed geopolymers after exposure to elevated temperatures (200–800 °C) and the formation of crystalline phases at higher temperature is presented.
Abstract: This paper presents a comparative study of the characteristic of unfoamed and foamed geopolymers after exposure to elevated temperatures (200–800 °C). Unfoamed geopolymers were produced with Class F fly ash and sodium hydroxide and liquid sodium silicate. Porous geopolymers were prepared by foaming with hydrogen peroxide. Unfoamed geopolymers possessed excellent strength of 44.2 MPa and degraded 34% to 15 MPa in foamed geopolymers. The strength of unfoamed geopolymers decreased to 5 MPa with increasing temperature up to 800 °C. Foamed geopolymers behaved differently whereby they deteriorated to 3 MPa at 400 °C and increased up to 11 MPa at 800 °C. Even so, the geopolymers could withstand high temperature without any disintegration and spalling up to 800 °C. The formation of crystalline phases at higher temperature was observed deteriorating the strength of unfoamed geopolymers but enhance the strength of foamed geopolymers. In comparison, foamed geopolymer had better thermal resistance than unfoamed geopolymers as pores provide rooms to counteract the internal damage.
97 citations