Properties of Fly Ash-Based Geopolymer Mortars

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Title: Properties of Fly Ash-Based Geopolymer Mortars

Author(s): A.M. Said, O. Saleh and A. Ayad

Publication: Special Publication

Volume: 334

Issue:

Appears on pages(s): 122-135

Keywords: Geopolymer; High temperature; Compressive strength; Alkali activated binder; Fly ash

Date: 9/30/2019

Abstract:
There is a growing need for alternative binders with smaller carbon footprint. The cement manufacture is an energy intensive process that is one of the major global contributors to carbon dioxide emission. Fly ash-based geopolymer binders represent one of these potential alternatives. Beside consuming a largely produced byproduct, fly ash-based geopolymers generally have better mechanical performance when exposed to elevated temperatures. This study evaluates the effect of the initial curing temperature and the alkaline activation solution proportions on the strength, pores structure and crystal structure of fly ash-based geopolymer mortars. The geopolymer was synthesized using Class F fly ash, potassium hydroxide solution and sodium silicate solution. The specimens were made using various ratios of sodium silicate to potassium hydroxide and were initially cured at different temperatures and their properties were studied in terms of mechanical and microstructural properties.