M. Pelletier’s scientific contributions

... A large-scale direct shear box apparatus is mainly designed to evaluate the performance parameters (shear and connection strength) of segmental block systems using a full scale laboratory study and these parameters have influence on facing stability as well as internal stability of SRW systems [1]. A typical test apparatus for full scale laboratory study of segmental retaining wall (SRW) units was designed and developed by Bathurst and Simac [2] and later on adopted in ASTM and NCMA standard guidelines. ...

Reference:

Performance of a Modified Shear Box Apparatus for Full Scale Laboratory Study of Segmental Retaining Wall Units

... Recent studies, including those from our previous work, have assessed the behavior of backfill materials under subsurface conditions using rock physics and seismic analysis. These studies provided preliminary insights into the compressional (Vp) and shear (Vs) wave velocities in materials with varying fly ash and biochar concentrations, indicating potential advantages for intermediate compositions [3], [4].Building on these findings, this study focuses on practical experimentation to identify an optimal composition of fly ash and biochar for backfill applications that achieves a balance of mechanical stability, ease of application, and long-term durability. Through experimental analysis, this research evaluates key properties such as compressive strength, flowability, and elastic moduli across different compositions and curing intervals. ...

Reference:

Exploring Backfill Material Behavior: Insights from Rock Physics and Seismic Analysis