Nondestructive Evaluation of FRP-Concrete Interface Bond due to Surface Defects

Table 5

Test matrix.

Sample number	Surface cleanliness	Surface wetness	Application direction	Epoxy	Voids
1 (control)	Clean	Dry	Underhead	Type 1	None
2 (control)	Clean	Dry	Underhead	Type 1	None
3	Clean	Dry	Underhead	Type1	Four voids (10.2 × 10.2 mm)
4	Clean	Dry	Underhead	Type 1	Four voids (20.3 × 20.3 mm)
5	Clean	Dry	Underhead	Type 1	Two voids (20.3 × 20.3 mm)
6	Clean	Dry	Underhead	Type 1	Two voids (40.5 × 40.5 mm)
7	Clean	Wet	Underhead	Type 1	None
8	Clean	Wet	Underhead	Type 1	None
9	Clean	Dry	Overhead	Type 1 + type 2	None
10	Clean	Dry	Overhead	Type 1 + type 2	None
11	Not clean	Dry	Underhead	Type 1	None