Application of Interfacial Propagation and Kinking Crack Concept to ECC/Concrete Overlay Repair System

Table 2

The property of four interfaces with different preparation methods.

Specimen number	Repair material	Surface preparation	𝜏𝑥𝑦 (Mpa)	Γ𝑖𝑐 [N/mm]
1	Concrete	Coupon untouched	0.776	0.0772
2	PVA ECC	Coupon untouched	2.287	1.002
3	PP ECC	Sandblast and moisture	1.138	0.881
4		Sandblast and scrape	2.238	0.507