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.