Evaluation of Mechanical Performance of High Performance Hybrid Fiber Reinforced Concrete Containing Micro Silica

N Venkata Narasimha Prabath,Ramadoss P

doi:10.13189/cea.2022.100118

Abstract

In the extended use of concrete in military applications, runway pavements and infrastructures, concrete is subjected to heavy impact loads that vary both in velocity and intensity. The addition of fibers in high performance concrete (HPC) can overcome its shortcomings such as brittleness, high shrinkage and less resistance to impact and also improve the ductile behavior and energy absorption capacity. In this study, development on strengthening of HPC using steel and Polypropylene fibers was focused. Moreover, an inclusion of volume fractions of both steel and polypropylene fibers, leads to an increase in the mechanical properties of concrete matrix. The present study represents the adding steel and Polypropylene fibres at 0.5, 1.0, 1.5, and 0.25, 0.5, 1% by volume of concrete, respectively. A concrete mix has been designed to achieve the M60 grade concrete, mixes proportioned for FRC to determine the compressive strength, split tensile strength and flexural strength of high performance hybrid fiber reinforced concrete at 28 days. The experimental results showed that the use of hybrid fibers with 1.5% steel and 1% Polypropylene fiber in HPC concrete has improved the strength of the concrete by 36% and 25.1% HPC with single fibers. The statistical tool was formulated to predict the strength properties of fiber reinforced concrete (i.e., compressive, flexural and split tensile strengths). The response surface method (RSM) was used to analyze the data and develop a regression equation. RSM was able to predict the experimentally tested values within an acceptable range.

Highlights

The widespread usage of concrete in constructions is owing to a number of factors, including its mechanical strength, ease of manufacturing, and moulding, as well as its affordable cost [1]
The combination of using light weight aggregates together with reinforcing fibers has been introduced in order to improve the material and mechanical characteristics of the lightweight concrete in [3] both fresh and hardened state and has led to the development of the fiber reinforced lightweight concrete whose application has been reported in several experimental and real case studies [4]
Over decades in an attempt to remedy the inherent disadvantages of plain concrete, Fibers are incorporated into the concrete mix, generally known as fibre reinforced concrete, to improve the mechanical characteristics of concrete, notably for its tensile and

Summary

Introduction

The widespread usage of concrete in constructions is owing to a number of factors, including its mechanical strength, ease of manufacturing, and moulding, as well as its affordable cost [1]. The synergetic impact of including polyethylene, steel, carbon, and polypropylene hybrid fibre on concrete flexural characteristics and the fibres show, increased flexural strength and ductility while associated fibre reinforcing mechanism were investigated reducing crack width [6, 7]. Mathematical formulae were usually accomplished by combining two types of fibres in established based on a new complete fibre reinforcing concrete, which improves the concrete's mechanical index to estimate the flexural loads, deflections, and characteristics [8]. Flexural the performance of high-strength concrete reinforced with behavior is enhanced to a degree. It has the steel and polypropylene fibres due to several chemical and capacity to decrease concrete plastic shrinkage [10]

Methods

Results

Conclusion