Role of Reactive Alumina and Reactive Oxide Ratios on Strength Development in Alakaline Activation of Low-Calcium Fly Ash

Author(s): Bhagath Singh G. V. P. and Kolluru V. L. Subramaniam
Paper category: Proceedings
Book title: Proceedings of International Conferences (ICACMS) Advances in Construction Materials and systems Vol 2
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN: 978-2-35158-194-0
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 268-275
Total Pages: 8
Language : English

Abstract: The role of reactive alumina and process variables such as sodium content and molarity on alkaline activation of different low calcium fly ashes are explored. Reactive alumina content of a fly ash is the key parameter which determines the maximum compressive strength achieved from the alkaline activation. The oxide ratios in the activated system, based on the total silica in the system consisting of the reactive silica contributed by fly ash and the reactive alumina in fly ash are shown to provide consistent results for achieving the highest strength. A method called XRD-based direct decomposition is used to determine the unreacted glassy content and amorphous reaction product in the system. The strength gain in the system is directly related to a decrease in the unreacted fly ash glassy content and an increase in the reaction product content in the system.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00