Title: Mechanical Properties of Fly-Ash-Based Geopolymer Concrete

Author(s): E. Ivan Diaz-Loya, Erez N. Allouche, and Saiprasad Vaidya

Publication: Materials Journal

Volume: 108

Issue: 3

Appears on pages(s): 300-306

Keywords: alkali-activated cement; fly ash; geopolymer; mechanical characterization

DOI: 10.14359/51682495

Date: 5/1/2011

Abstract:
The mechanical properties of fly-ash-based geopolymer concrete (GPC) were studied. Experimentally measured values of the static elastic modulus, Poisson’s ratio, compressive strength, and flexural strength of GPC specimens made from 25 fly ash (FA) stockpiles from different sources were recorded and analyzed. The results were studied using regression analysis to identify tendencies and correlations within the mechanical properties of GPC. It was found that the mechanical behavior of GPC is similar to that of ordinary portland cement (OPC) concrete, suggesting that equations, akin to those given by ACI 318-08, could be applied for GPC to determine its flexural strength and static elastic modulus. The validity of an equation to determine the density of GPC as a function of FA fineness was also put forward.