Effects of Water Immersion on the Adhesion between Adhesive Layer and Concrete Block

Table 2

Experimental program and main test result.

Specimens^a	Exposure duration (week)	Fracture energy (mJ/mm^2)	Ultimate load (kN)	Ultimate slip (mm)	Initial stiffness (N/mm)
P0W-1	0	0.46	2.27	0.57	4.1
P0W-2	0	0.91	3.19	0.82	3.8
P0W-3	0	0.94	3.25	0.92	3.7
P2W-1	2	0.37	2.04	0.37	5.3
P2W-2	2	0.28	1.78	0.26	6.1
P2W-3	2	0.42	2.16	0.41	3.2
P4W-1	4	0.50	2.38	0.28	8.0
P4W-2	4	0.26	1.71	0.23	6.0
P4W-3	4	0.39	2.10	0.25	7.1

^a0 W, 2 W, and 4 W denote exposure to 0 week, 2 weeks, and 4 weeks of water immersion, respectively. 1, 2, and 3 denote the number of the specimens.