Contact and Noncontact Ultrasonic Nondestructive Test in Reinforced Concrete Beam

Table 1

Design mix of concrete.

Type	Maximum size of gravel (mm)	W/C (%)	Unit quantity (kg/m^3)
			Water	Cement	Sand	Gravel	Water-reducing agent
WC40	20	40	169	422	702	1039	0.84
WC60		60	175	291	812	1021	0.58