Bond Behavior between Concrete and Self-Expansion Polymer Material under Normal Pressures

Table 1

Mix proportions and mechanical properties of concrete.

Type	C20	C30	C45
Compressive strength fc (MPa)	38.24	43.06	57.32
Cement : water : sand : coarse aggregate	1 : 0.64 : 2.18 : 4.05	1 : 0.60 : 1.91 : 3.54	1 : 0.43 : 1.28 : 2.38
Elastic modulus Ec (GPa)	32.9	33.7	36.1
Poisson’s ratio	0.22	0.22	0.23
Surface roughness (mm)	0.187	0.168	0.147