ULTRASONIC METHOD OF INSPECTION OF THICKNESS OF DAMAGED CONCRETE LAYER IN CONSTRUCTIONS UNDER EXPLOITATION

摘要

FIELD: inspection facilities. ^ SUBSTANCE: thickness of damaged concrete layer in exploitable constructions of plants is inspected at increased humidity of concrete at negative temperatures and as a result at presence of ice crystals in pores of concrete. Fault detection of concrete and ferroconcrete constructions is carried out by ultrasonic longitudinal profiling by means of mounting of irradiator motionlessly onto concrete surface and receiver is shifted step by step with a pitch of 10-100 mm along line crossing point of mounting of irradiator. Count of time of propagation of ultrasonic longitudinal waves is fixed at any installation of the receiver. Time-distance dependence between irradiator and receiver is plotted. The plot is named as velocity curve. Change in curve line is determined at the turn of damaged and non-damaged concrete. Sound velocity is found in damaged and non-damaged layers of concrete as well as humidity of non-damaged and damaged layers of concrete. After that thickness of damaged layer of concrete is found from corresponding mathematical formula. ^ EFFECT: improved precision and reliability of measurement of damaged layer of concrete. ^ 3 dwg