A Study on the Effect of Sodium Silicate Modulus on the Mechanical Properties and Microstructure of Fly Ash Based Geopolymers

Author(s): M. Srinivasula Reddy, Dinakar Pasla and B. H. Rao
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: 135-142
Total Pages: 8
Language : English

Abstract: Ordinary Portland cement being the most abundantly used cementitious material in concrete production and one tonne of cement production accounts for almost 0.9 to 1.0 tonne CO2 gas emissions and therefore, developing a new form of concrete which reduces the CO2 emissions and at the same time, usage of waste (byproducts) are vital. This urges for a use of alternative binder, which has less carbon footprint on environment. Geopolymer concrete is the most suitable option for this problem, which has equal balance between sustainability and strength. In this paper, effect of sodium silicate modulus (i.e. SiO2 to Na2O ratio) on the compressive strength of fly ash based geopolymers has been discussed. For this, tests have been conducted to study the effect of the silicate modulus on the 3, 7, 14, and 28 day compressive strengths. It has been found that, silicate modulus influences the compressive strength of geopolymer mortars significantly. It also influences the optimum sodium silicate to sodium hydroxide ratio required for better compressive strengths. Also, SEM analysis has been carried out to study the micro-structural changes in the mortar specmens made with different sodium silicate modulus

Online publication :2017
Publication type :full_text
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