Why do shotcrete specs insist on removing loose rebound before subsequent layers?
Choices
- (A) Rebound always strengthens bond
- (B) Unbonded lumps create planes of weakness and water paths between passes
- (C) Rebound is cosmetic only
- (D) Cleaning wastes time without benefit
Correct answer: (B)
Unbonded lumps create planes of weakness and water paths between passes
Explanation
Next passes need dense substrate not shelly pockets.