Mechanical Properties Prediction of Normal and High Strength Geopolymer Concrete

Sameh Tobeia,Narjis Abbas,Nada Assi

doi:10.30684/etj.v39i12.1984

Abstract

The production process of cement is the main binder material in concrete usually accompanied by carbon dioxide emission. Therefore, geopolymer concrete (GPC) an alternative binder material was developed as a replacement for cement. In order to make this promising material more common in constructions and applicable for different design purposes further investigations for GPC mechanical properties were needed. This work aims to predicate the splitting tensile strength, modulus of elasticity and flexural strength for normal and high strength GPC by deriving new equations covering a wide range of compressive strength based on data available from previous work. Equations behavior along the changes in compressive strength from normal to high is adopted in comparisons as illustrated. The results show that the proposed equations, as compared with other equations established by previous works, provide a steady behavior for the various values of compressive strength especially for high strength. The coefficient of variation (COV) used as additional comparison criteria, and shows that the proposed equations provide better estimation of GPC mechanical properties.

Highlights

As the concrete became one of the most common construction materials, and due to the massive consumption of cement which is considered the main binder material in concrete, huge amounts of carbon dioxide emitted during cement manufacturing
The results obtained from the proposed equation (Eq(4)) that used to estimate the splitting tensile strength show a steady behavior along with the increase in compressive strength providing a suitable estimation for splitting tensile especially for high-strength geopolymer concrete (GPC), while the revisited equations tend to be unconservative with the increasing in GPC compressive strength as illustrated in Fig.(1), the unconservative behavior can be led to uncertain estimation with higher values of compressive strength
Whilst the revisited equations established for cement concrete, most of these equations tend to behave conservatively with higher values of GPC compressive strength

Summary

Introduction

As the concrete became one of the most common construction materials, and due to the massive consumption of cement which is considered the main binder material in concrete, huge amounts of carbon dioxide emitted during cement manufacturing. This emission released the harmful carbon dioxide to the environment causing devastated effects. Several previous works investigated both chemicals and physical GPC properties, Kalaivani [1] examined the flexural strength of GPC based on fly ash. Venu and Rao [2] investigated the mechanical properties of GPC using a certain concentration of NaOH and studied the behavior of stress-strain curve with the strength of GPC. Due to the promising environmental gain coming from using GPC, further studied that investigate the mechanical properties of GPC should be done to make this innovative material more suitable for different structural purposes

Objectives

Results

Discussion

Conclusion