Concrete cold joint quality detection method, device and system based on impact elastic waves

The invention discloses a concrete cold joint quality detection method based on impact elastic waves. Impact elastic waves are used for measurement and analysis on the single side of a concrete cold joint to obtain complete concrete strength S0; impact elastic waves are used for measuring and analyzing the two sides of the concrete cold joint to obtain the concrete strength S1 across the cold joint and the equivalent crack depth Dc of the cold joint; and finally, the sound index eta c of the concrete cold joint is obtained through calculation by means of S0, S1, Dc and the wavelength lambda ofthe impact elastic waves. The concrete cold joint quality detection system based on the impact elastic waves comprises a vibration excitation hammer, an acceleration sensor, a data collector, a computer and concrete to be detected. The acceleration sensor is arranged on the surface of concrete to be measured, the excitation hammer is used for knocking the concrete to be measured to change impactelastic wave signals recei