Fig. 7
From: Effects of humidity and interlayer cations on the frictional strength of montmorillonite
Comparison of our experimental data with previous experimental studies of Ca-montmorillonite at effective normal stresses of 5–25 MPa, temperatures up to 100 °C, and loading velocities up to 10 µm/s. The note near the symbols show each water content or experimental condition. The sample of Saffer et al. (2001) has ~ 11 wt% water. Behnsen and Faulkner (2013) carried out experiments under water-saturated condition, and Haines et al. (2013) conducted at room temperature and humidity