Measurements of the elastic modulus of pavement subgrade layers using the SASW and fwd test methods

Nur Izzi Md Yusoff, Sentot Hardwiyono, Norfarah Nadia Ismail, Mohd. Raihan Taha, Sri Atmaja P Rosyidi, Khairul Anuar Mohd Nayan

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In pavement management systems, deflection basin tests, such as the Falling Weight Deflectometer test, are common techniques that are widely used, while the surface wave test, i.e. the Spectral Analysis of Surface Wave test, is recently employed as an alternative technique in pavement evaluation and monitoring. In this paper, the performance of both dynamic non-destructive tests on pavement subgrade investigation is presented. Surface wave propagation between a set of receivers was transformed into the frequency domain using the Fast Fourier Transform technique and subsequently a phase spectrum was produced to measure the time lag between receivers. Using the phase difference method, an experimental dispersion curve was generated. Inversion analysis based on the 3-D stiffness matrix method was then performed to produce a shear wave velocity profile. The elastic modulus of pavement layers was calculated based on linear elastic theory. In the Falling Weight Deflectometer test, seven geophones were used to collect in situ deflection data. Based on a back-calculation procedure with the ELMOD software, the elastic modulus of each flexible pavement layer can be obtained. Both techniques are able to comprehensively investigate the elastic modulus of the subgrade layer in existing pavement non-destructively. The elastic modulus between the Spectral Analysis of Surface Wave method and the Falling Weight Deflectometer test on the subgrade layer is observed to be in a good agreement. A correlation of the elastic modulus of thesubgrade layer from both techniques is also presented.

Original languageEnglish
Pages (from-to)174-181
Number of pages8
JournalBaltic Journal of Road and Bridge Engineering
Volume10
Issue number2
DOIs
Publication statusPublished - 2013

Fingerprint

Pavements
Elastic moduli
Surface waves
Spectrum analysis
Seismographs
Shear waves
Stiffness matrix
Fast Fourier transforms
Catchments
Wave propagation
Monitoring

Keywords

  • Elastic modulus
  • Pavement
  • Spectral analysis of surface wave and falling weight deflectometer

ASJC Scopus subject areas

  • Building and Construction
  • Civil and Structural Engineering

Cite this

Measurements of the elastic modulus of pavement subgrade layers using the SASW and fwd test methods. / Md Yusoff, Nur Izzi; Hardwiyono, Sentot; Ismail, Norfarah Nadia; Taha, Mohd. Raihan; Rosyidi, Sri Atmaja P; Mohd Nayan, Khairul Anuar.

In: Baltic Journal of Road and Bridge Engineering, Vol. 10, No. 2, 2013, p. 174-181.

Research output: Contribution to journalArticle

Md Yusoff, Nur Izzi ; Hardwiyono, Sentot ; Ismail, Norfarah Nadia ; Taha, Mohd. Raihan ; Rosyidi, Sri Atmaja P ; Mohd Nayan, Khairul Anuar. / Measurements of the elastic modulus of pavement subgrade layers using the SASW and fwd test methods. In: Baltic Journal of Road and Bridge Engineering. 2013 ; Vol. 10, No. 2. pp. 174-181.
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