Early-age fatigue damage assessment of cement-treated bases under repetitive heavy traffic loading

Arooran Sounthararajah, Ha Hong Bui, Nhu Nguyen, Peerapong Jitsangiam, Jayantha Kodikara

Research output: Contribution to journalArticleResearchpeer-review

9 Citations (Scopus)

Abstract

This paper aims to develop measures to minimize the early-age fatigue damage of prematurely opened cement-treated bases (CTBs) due to repetitive heavy traffic loading. The four-point bending test was used in this study to characterize the early-age fatigue performance as well as the flexural properties of two different locally sourced granular materials stabilized with 3% general purpose (GP) cement. All the flexural tests were executed under stress-controlled mode. The fatigue test results evinced the existence of an endurance limit in cemented granular materials (CGMs) even at 7 days curing age. A stress-based fatigue performance model was developed for predicting the early-age fatigue performance of CGMs in service. In addition, the 7-day fatigue test data from this study were validated using existing CGM fatigue models. The numerical results obtained from the CIRCLY program indicated that the level of interaction between the axles of an axle configuration decreases with decreasing CTB layer thickness, resulting in increased pavement fatigue damage. It was also found that the asphalt cover over CTB required to prevent the occurrence of initial fatigue damage to the CTB decreases with increasing CTB modulus, subgrade strength, and CTB layer thickness. The limitations and simplifications in current pavement design and testing methods are also critically discussed and addressed on the basis of the results of this study.

Original languageEnglish
Article number04018079
Number of pages15
JournalJournal of Materials in Civil Engineering
Volume30
Issue number6
DOIs
Publication statusPublished - 1 Jun 2018

Keywords

  • Cement-treated pavement materials
  • Early-age fatigue damage
  • Endurance limit
  • Flexural fatigue behavior
  • Heavy traffic loading
  • Prematurely opened highways

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