An experimental study was carried out on sensitive clays obtained from Ottawa-Quebec area (Kinburn, ON, Breckenridge and Outardes-2, QC) and relatively uniform sand obtained from the Fraser Delta (BC). Large strain tests were conducted at over consolidated and normally consolidated states to investigate the monotonic and cyclic behaviour of sensitive clays. Small strain tests were carried out over a range of consolidation stress levels to investigate the dynamic properties of clays and Fraser River sand. All tests were performed using the Carleton University simple shear device, which was modified to enable confident measurements at very small strains.Test results show that shear strength of clays is influenced by consolidation stress, over consolidation ratio and clay content. Further, this study reveals that these sensitive clays at the tested sites have relatively strong cyclic resistance at in-situ stress level, but cyclic resistance decreased significantly if the clays are normally consolidated.Site-specific modulus reduction and damping ratio curves are proposed for Ottawa-Quebec area clays and Fraser River sand. These site-specific curves are unique for sensitive clays and cannot be equated to any curves published in the literature. The curves generated for Fraser River sand are close to the average and lower bound curves reported in the literature for sands.ii