Open AccessMechanical Characteristics of Geopolymer Mortar in Ambient Air and Immersion Curing
Author(s) -
Suruchi Sneha,
K P Ramaswamy
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/989/1/012009
Subject(s) - materials science , geopolymer , mortar , fly ash , composite material , curing (chemistry) , compressive strength , portland cement , cement
Geopolymer concrete is an environmentally sound alternative to the conventional concrete, which could assist in reducing the carbon footprint that augments the process of global warming. The current work presents a comparative study on the compressive strength and ultrasonic pulse velocity of geopolymer mortar mixes at activator modulus (SiO 2 /Na 2 O) of 1.25, 1.50 and 1.75 subjected to ambient air curing and immersion curing. The dynamic modulus of elasticity determined from the UPV results are analogized with the compressive strength. The study also aims at developing economic geopolymer mortar with acceptable mechanical properties. The three mixes considered for the study include geopolymer mortar with 100% slag, 50% slag and 50% fly ash and 50% red mud and 50% slag. The molarity of alkaline solution and sand-binder ratio is fixed as 8M and 1.50 respectively. The results indicate that the immersion cured specimens of the mix with 50% slag and 50% fly ash corresponding to the activator modulus 1.50 has satisfactory strength performance. The dynamic modulus of elasticity was found to be higher for the immersion cured specimens.