Beam-Slab Cracks Nondestructive Testing Technology and Application Based on Ultrasonic Method

The concrete bridge was easily affected in the construction and using stage by the design and construction,environment and natural disasters,which result in cracks and affect the normal service of structural.For ensuring safety,the reasonable detection method need to be used to detect the cracks,determine the depth and analysis the reasons of cracks,and provide evidence for the cracks treatment.Based on the principle of ultrasonic method,through single plane detecting,double-side detecting for the beam-slab crack area,the depth,width and influence area of the crack were ensured in engineering by the width test for the beam-slab crack area with high multiples reading microscope.The result shows that this method has high test precision for detecting the concrete defects with the acoustical parameters including sound speed and waveform.