ORCID Profile
0000-0002-7065-5606
Current Organisation
University of South Australia
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Publisher: MDPI AG
Date: 25-05-2020
DOI: 10.3390/SU12104313
Abstract: The mechanistic design of a concrete block pavement (CBP) can be very complicated and often requires the use of computer programs. This paper presents a new mechanistic-empirical method, which is implemented in a computer program (DesignPave) that calculates base course/sub-base thicknesses for a range of design inputs such as traffic load, interlocking properties, and material stiffness. A range of virgin and recycled unbound granular materials were also experimentally tested to characterize them for possible use as base course or sub-base materials. Combining the new mechanistic-empirical method and the range of base course/sub-base course materials (virgin and recycled aggregates), it was found that while a CBP containing recycled aggregates did not offer a significant direct financial benefit based on the characteristics or material costs, the associated environmental benefits were very high.
Publisher: Thomas Telford Ltd.
Date: 12-2018
Abstract: The characteristic features of undrained responses of granular materials, for ex le, stress ratio at instability ( η IS ) and phase transformation ( η PT ) states and the critical state (CS) behaviour, are often influenced by the consolidation history. However, there are limited studies in the literature, and a consensus has not yet been reached. This study combined the triaxial test of yellow silty sand and the three-dimensional discrete element method (DEM) simulation of ellipsoid particles under a triaxial condition to evaluate the effect of isotropic and K 0 consolidations. Triaxial test data formed non-unique CS lines (CSLs) in the e–log(p′) space for isotropic and K 0 tests, whereas the CSL was unique for DEM simulations where e and p′ are the void ratio and mean effective stress, respectively. The micromechanical quantities, coordination number (C N ) and fabric anisotropy (F vM ) at the CS, also showed a unique relation with p′. The characteristic features, η IS and η PT , showed good correlation with the state parameter (ψ ) and the density indices. It was found that the η IS decreased with ψ, and the correlation was dependent on consolidation type. The micromechanical analysis suggested that F vM is a better parameter than C N to characterise the macromechanical behaviour. This study unambiguously supports the applicability of CS theory and provides insights into micromechanics of granular materials.
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2018
Publisher: Elsevier BV
Date: 08-2019
Publisher: American Society of Civil Engineers (ASCE)
Date: 08-2019
Location: Bangladesh
Location: Australia
No related grants have been discovered for Abu Taher Md Zillur Rabbi.