Debonding Performance of CFRP-Strengthened Nanomaterial Concrete Beam Using Wavelet Packet Analysis

Yang Liu,Xinfeng Yin,Lei Wang,Ming Zhang,Zhou Huang

doi:10.1155/2020/7526703

Yang Liu, Xinfeng Yin + Show 3 more

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https://doi.org/10.1155/2020/7526703

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Abstract

The carbon fiber reinforced polymer- (CFRP-) strengthened nanomaterial concrete beam (SNCB) has been increasingly attracting a widespread attention because of the advantages of using the excellent properties of nanomaterials to improve structural properties. An active sensing approach based on a piezoceramic transducer is developed to detect the interfacial debonding performance of CFRP-SNCB. A CFRP-SNCB specimen was fabricated and subjected to periodic loading test to initiate the debonding damage. Three piezoceramic smart aggregates (SAs) and three piezoceramic smart nanomaterial aggregates (SNAs) are embedded in the specimen and used as an actuator and sensor. Experiments show that the nanomaterial concrete becomes a good conduit for wave propagation due to the nucleation and filling effect of nanomaterial. The stress wave signal caused by the embedded SNAs is more sensitive to the debonding performance between CFRP and concrete than SA. The attenuation of stress wave caused by the increase of the severity of debonding damage can be clearly observed from the signals received from SAs and SNAs in the frequency domain analysis. The debonding cracking of the tension end region is earlier than the bond end region, which proves the starting point of structural debonding damage. Furthermore, the debonding state can be evaluated by wavelet packet analysis. The research results demonstrate that the proposed method has potentials to detect the interfacial debonding performance of CFRP-SNCB.

Highlights

Prestressed carbon fiber reinforced polymer- (CFRP-) strengthened nanomaterial concrete beam (SNCB) is a new and efficient reinforcement, repair, and transformation technology
This paper introduces an active sensing approach based on a smart aggregates (SAs)/smart nanomaterial aggregates (SNAs) sensor to monitor the secure bonding state of the nanomaterial concrete beam with nearsurface mounted (NSM) prestressed CFRP plates
Nano-CaCO3 concrete becomes a good pipeline for wave propagation because of the nucleation and filling effect of nanomaterials

Summary

Introduction

Prestressed carbon fiber reinforced polymer- (CFRP-) strengthened nanomaterial concrete beam (SNCB) is a new and efficient reinforcement, repair, and transformation technology. Nanomaterial concrete structure with nearsurface mounted (NSM) prestressed CFRP plates has attracted more and more attention in civil engineering [4]. The improvement of bearing capacity depends on the integrity of CFRP-concrete interface. Debonding cracks in the internal interface of the structure are difficult to observe in the engineering. Once the cracks are connected to each other, the bearing capacity of the structure will immediately fail, which may eventually cause huge loss of life and property. In order to solve this problem, the materials of nanomaterial-based concrete are introduced in the structures, and the interface debonding performance of CFRP-SNCB is investigated in this study. It is desirable to develop a reliable monitoring system to monitor the initial installation quality and the long-term efficiency of the CFRP tension zone [5]

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