STATIC AND CYCLIC PROPERTIES OF MUNICIPAL SOLID BOTTOM ASH IN VIETNAM

Abstract

: In this study, direct shear tests and cyclic triaxial tests were conducted to investigate the
effectiveness of using municipal solid waste bottom ash (MSWIBA) material as fill material or base/sub-base
in Vietnam. A square of large – scale (300 x 300 x 140 mm) and a small scale (60 mm in diameter) direct shear
test were carried out on MSWIBA samples to study the effect of specimen size on shear strength of the samples.
The results show that the MSWIBA sample at R95 has a very high CBR value of 115%, which is much higher
than the CBR value of crushed stone for subgrade applications. The cohesion and friction angle in the case of
R95 are higher than those in the case of R90. The value of cohesion and friction angle in the large direct shear
test are significantly higher than those obtained in the small direct shear test. The shear strength of MSWIBA
is like natural sand. The resilient modulus decreased with the increase of deviator stress in the case of R90
sample and increased with the increase of deviator stress in the case of R95. The numerical method results also
show that MSWIBA material can be used as construction material such as roadbed and foundation layers.