Study of the Characteristics Mechanical Damage and Constitutive Model of Crushed-Rocks from High-Grade Highway in Permafrost Region

Figure 9

SEM images of red sandstone at different freeze-thaw times at 50 and 2000.

(a) 5 freeze-thaw cycle

(b) 5 freeze-thaw cycle

(c) 20 freeze-thaw cycle

(d) 20 freeze-thaw cycle