Preliminary study on assessing delaminated cracks in cement asphalt mortar layer of high-speed rail track using normalized impact-echo method

Chia Chi Cheng, Yi Qing Ni, Keng Tsang Hsu, Tai Tung Wai

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)

Abstract

The severe deterioration of the CA mortar layer may lead to the movement of the upper concrete slab and compromise the safety of the speedy train. In this study, a specimen simulating the structure of high-speed rail track slabs was built with delaminated cracks embedded inside the CA mortar layer. In the specimen, the defects are located at either top concrete slab-CA mortar interface or CA mortar-bottom concrete slab interface. The lateral size of the defect and mortar-thickness are also experimental variables. The impact-echo tests were performed above the defected and good-bond locations. Normalized amplitude spectra were obtained by dividing amplitude of the impact-echo spectrum to the amplitude of the spectrum corresponding to the modified displacement of the Rayleigh wave. The dominant peak frequency and amplitude in the normalized amplitude spectrum were closely related to the existence of the delaminated defect underneath the test point. The results showed the defects could be assessed more easy for a test performed on the region containing the thinner CA mortar layer. Simple indices were developed to identify the soundness of the CA mortar layer. The indices are obtained based on the difference of the experimental peak amplitude and frequency to the ones calculated from the previously developed formulas for a plate without substrates. As a result, the present technique requires no experimental baseline for the crack assessment.

Original languageEnglish
Title of host publicationStructural Health Monitoring 2019
Subtitle of host publicationEnabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT) - Proceedings of the 12th International Workshop on Structural Health Monitoring
EditorsFu-Kuo Chang, Alfredo Guemes, Fotis Kopsaftopoulos
PublisherDEStech Publications Inc.
Pages2870-2877
Number of pages8
ISBN (Electronic)9781605956015
Publication statusPublished - 1 Jan 2019
Event12th International Workshop on Structural Health Monitoring: Enabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT), IWSHM 2019 - Stanford, United States
Duration: 10 Sep 201912 Sep 2019

Publication series

NameStructural Health Monitoring 2019: Enabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT) - Proceedings of the 12th International Workshop on Structural Health Monitoring
Volume2

Conference

Conference12th International Workshop on Structural Health Monitoring: Enabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT), IWSHM 2019
CountryUnited States
CityStanford
Period10/09/1912/09/19

ASJC Scopus subject areas

  • Computer Science Applications
  • Health Information Management

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