Study on Physical and Microstructural Properties of Light Weight Aerated Fly Ash Based Geopolymer.

Author(s): T. Revathi, R. Jeyalakshmi and N. P. Rajamane
Paper category: Proceedings
Book title: Proceedings of the 71st RILEM Annual Week & ICACMS 2017,Chennai,India, 3rd -8th September 2017
Editor(s): Manu Santhanam
Ravindra Gettu
Radhakrishna G. Pillai
Sunitha K. Nayar
ISBN: 978-2-35158-196-4
ISBN: 978-2-35158-190-2 (Set)
e-ISBN: 978-2-35158-191-9:
Publisher: Published by RILEM Publications S.A.R.L.
Publication year: 2017
Pages: 26-35
Total Pages: 10
Language : English

Abstract: Geopolymers are representing the most promising eco-friendly alternative to ordinary
Portland cement for their higher performance characteristic and durability. Aerated light
weight concrete consisting of cementitious binder with high degree of void space are popular
mainly for their thermal insulation properties. In this present investigation advantage of
geopolymer for its thermal resistance has been effectively used for making light weight fly
ash based geopolymer aerated by aluminium powder. Different specimens were prepared by
considering the effect of influential parameters that include, liquid/binder ratio (L/B),
NaOH/sodium silicate and % of Al powder and thermo-physical properties have been
studied. Fly ash with substitution of 0.5% aluminium powder, (L/B) of 0.45 with sodium
silicate to sodium hydroxide weight ratio of 1.0 causes best foamed specimen with a density
1005 kg/m3
and attained compressive strength of 4-5 MPa. Thermal analysis data
(TGA/DTA) indicated that residual mass loss was about 2% at the temperature 1000C
indicated that free water lost during the preparation of aerated specimen by the addition of
aluminium. The microstructure and digital image analysis revealed that more unreacted fly
ash in the specimens indicated faster foaming reaction prevent complete dissolution of fly
ash.

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