Investigation of Mixture Factors Influencing Alkali-Silica Reaction in Fly Ash-Based Geopolymer Mortars

Author(s): Abdolhossein Naghizadeh and Stephen O. Ekolu
Paper category: Proceedings
Book title: Proceeding of the 71st RILEM Annual Week & ICACMS 2017
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN:978-2-35158-195-7, 978-2-35158-190-2 (Set)
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 395-400
Total Pages: 6
Language : English

Abstract: This study investigated the effects of different mixture factors on alkali-silica reaction (ASR) in Class-F, fly Ash (FA)-based geopolymer mortars. FA and alkali-activator were mixed at liquid-to-solid ratios (L/S) of 0.3-0.6. Different combinations of Sodium Silicate (SS) and sodium hydroxide (SH) mixed in the ratios of 1.0, 1.5, 2.0, 2.5, and 3.0, were used as alkali activator. SH concentrations in activator were varied to 10, 12, and 14 M NaOH. In total, 46 mixes of FA-based geopolymer mortars were prepared. Two types of local aggregates, which are known to be highly reactive, were used as fine aggregates. Mortar prisms were cast for determination of ASR expansion. Results showed L/S ratio to be one of the most influential variables affecting ASR expansion. An L/S ratio of 0.5 caused the highest ASR expansion. There is a possibility that higher L/S and SS/SH ratios could lead to ASR attack. Further work is being conducted on this aspect.

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