Investigating the Structural Performance of Precast Concrete Pipes with Steel Fiber-Reinforced Geopolymer Concrete

Abstract

Recent developments in materials science have identified geopolymer as a promising substitute for Ordinary Portland Cement (OPC), with industrial byproducts serving as its primary ingredients. Studies on geopolymer concrete have revealed notable improvements in early strength development and superior resistance to chemical reactions, in contrast to OPC. These properties of geopolymer prefer its use in precast concrete pipes production. This study recognizes the need to interpret the structural response of geopolymer concrete under load-deflection behavior of geopolymer concrete pipes. In collaboration with “Allah Ho Yasir” precast pipe factory located in Lahore, Punjab, Pakistan. R.C.C pipes of 450mm diameter using OPC and GPC were manufactured at industrial scale. For the geopolymer concrete (GPC) locally produced steel fibers are added with the dosage of 30 kg/m³ along with conventional steel cage. These pipes were manufactured by conventional methodology. For structural analysis performed destructive and non-destructive test, were performed. Destructive testing includes compressive strength test, core cutter compressive test, and three-edge bearing test which provided critical insights regarding maximum load-bearing capacity and failure characteristics. The core cutter compressive test was particularly valuable in assessing the in-situ compressive strength of the concrete within the pipes. Additionally, bond strength tests were performed to assess the adhesion between the steel bars and the concrete matrix, which is essential for structural strength of the pipes. Non-destructive testing such as ultrasonic pulse velocity and rebound/Schmidt hammer test, were performed to assess the quality and uniformity of the concrete without causing damage. These combined testing approaches ensured a comprehensive understanding of the mechanical properties, bond strength, and structural strength of the geopolymer concrete pipes, providing its potential application in R.C.C projects.