พัชรี อิสสะโร. Small-strain and Rate-dependent Behaviors of Hot-mixed Asphaltic Concrete (HMA). Master's Degree(Civil Engineering). King Mongkut's University of Technology Thonburi. KMUTT Library. : King Mongkut's University of Technology Thonburi, 2009.
Small-strain and Rate-dependent Behaviors of Hot-mixed Asphaltic Concrete (HMA)
Abstract:
In this study, the small-strain and rate-dependent behaviors of hot-mixed asphaltic
concrete (HMA) were investigated by performing unconventional unconfined
compression tests. The small-strain stress-strain properties were evaluated by
performing continuous monotonic loading (ML) tests and ML tests by applying
sustained loading (SL) and minute-amplitude cycles of unload and reload. The rate dependency
was investigated by stepwise changing the vertical (axial) strain rate, Ev,
for several times during otherwise ML tests. The vertical and horizontal strains were
locally measured by means of a pair of local deformation transducers (LDTs) and a set
of three clip gages, respectively. Then, different Young's moduli and Poisson's ratios
defined in this study were accurately determined. Therefore, it becomes possible to
precisely evaluate: 1) initial Young's moduli (Eo) and Poisson's ratios (vo); 2)
equivalent elastic Young's moduli (Eeq) and Poisson's ratios (Veq) for different vertical
stress values; and 3) tangential stiffness values (Etan ) and Poisson's ratios (Vtan) which
vary with an increase in the vertical stress. Moreover, the viscous property of HMA is
of Isotach type.