Experimental Analysis of Tensile Mechanical Properties of Sprayed FRP

Kun Wu,Zhao Yang

doi:10.1155/2016/3514830

Abstract

To study the tensile mechanical properties of sprayed FRP, 13 groups of specimens were tested through uniaxial tensile experiments, being analyzed about stress-strain curve, tensile strength, elastic modulus, breaking elongation, and other mechanical properties. Influencing factors on tensile mechanical properties of sprayed FRP such as fiber type, resin type, fiber volume ratio, fiber length, and composite thickness were studied in the paper too. The results show that both fiber type and resin type have an obvious influence on tensile mechanical properties of sprayed FRP. There will be a specific fiber volume ratio for sprayed FRP to obtain the best tensile mechanical property. The increase of fiber length can lead to better tensile performance, while that of composite thickness results in property degradation. The study can provide reference to popularization and application of sprayed FRP material used in structure reinforcement.

Highlights

Fiber reinforced polymers (FRP) composite materials have been largely used as strengthening and rehabilitation materials for decades in civil engineering
The first is that the interfacial debonding between FRP sheet or plate and structure member will occur for the degradation of the bonding quality, which will lead to a premature failure of FRP [6,7,8,9,10,11,12,13]
This paper has studied the tensile properties of sprayed FRP through tensile experiments of 13 groups of specimens, which include tensile strength, elastic modulus, breaking elongation, and Poisson ratio

Summary

Introduction

Fiber reinforced polymers (FRP) composite materials have been largely used as strengthening and rehabilitation materials for decades in civil engineering. The main forms of these materials are sheet and plate, which are usually externally bonded on the surfaces of structure members. The third is that the external bonding method of FRP sheets or plates will be hardly conducted in some structure members such as beam-column joints, which cannot provide enough flat surfaces for FRP to be pasted continuously and the core areas of which are difficult for such forms of FRP to wrap efficiently [17,18,19,20,21,22]. The sprayed FRP material can be formed continuously on the structure surface This kind of FRP has some advantages compared with the external bonded ones. There are resins, leveling materials, and concrete substrate bonded together This will increase the debonding possibility and make the application process complicated. The results can provide theoretical basis for tensile property calculation and actual application of sprayed FRP

Tensile Tests

C-2 G-2 G-6 G-9

Test Results

Influencing Factors on Tensile Mechanical Properties of Sprayed FRP

Summary and Conclusions