Modulus of Elasticity of Flyash-Slag Based Reinforced Geopolymer Concrete Flexural Elements

Abstract

Alkali activated fly ash-slag based geopolymer concrete (GPC) are being well received by industry, but its applications as reinforced concrete members still need a better understanding of its performance. The Modulus of Elasticity (MoE) of Reinforced Geopolymer Concrete (RGPC) elements indicates the suitability of GPC in mass applications and their long-term performance. In the first phase, better GPC mix proportion is developed by varying percentages of ingredients and studying their influence on strengths and MoE. The MoE of the developed GPC mix is compared with existing models to arrive at the most realistic value. In the second phase, developed GPC mix is used to cast different under reinforced flexural specimen (slabs) and are load tested for their strength - deformation behaviour under monotonically increasing central point loads and uniformly distributed loads using two type of support condition i.e. two opposite sides simply supported, and all 4 sides simply supported. From the load deflection behaviour and using elastic analysis, the MoE of RGPC sections are determined and are compared with MoE based on rule of mixture, using MoE of GPC from the codal provisions of OPC based concrete. The two results of MoEs of RGPC are best comparable.