Experimental Study on the Effect of the Freeze–Thaw Cycle in an Acidic Environment on the Mechanical Properties of Grout-Reinforced Rock Specimens

A new type of grouting material—FCM (fast cementing material)—is being used in coastal and offshore infrastructure projects, such as harbor tunnel rehabilitation. In order to investigate how this material performs under different conditions, the compressive strength, failure mode, surface microscopic changes fracture penetration degrees crack angles grout-reinforced specimens formed by FCM sandstone were investigated an acidic environment with pH = 1.1 after freeze–thaw cycles 5, 10, 20, 30 times. addition, through preliminary determination fluidity setting time, it was determined that water-material ratio test is 0.3, has good uniformity. The results show strength original rock can be matched or even exceeded solid grout sandstone. Acidic environments will erode specimens, mainly on specimens. degree angle determine reduction decreases most rapidly within 10 cycles. After soaking solution a cycle environment, particle shedding occurs “honeycomb” area appears As increases, particle-shedding honeycomb increase continuously.