ULTRASONIC METHOD OF TESTING OF CONCRETE'S STRENGTH IN CONCRETE AND FERROCONCRETE CONSTRUCTIONS DURING EXPLOITATION Russian patent published in 2006 - IPC G01N29/07 

FIELD: testing of concrete constructions strength.

SUBSTANCE: strength of concrete in concrete and ferroconcrete constructions is determined at increased humidity of concrete and negative temperatures and, as a consequence, at presence of ice crystals in pores of concrete. According to the first version of the method, water-saturated, frozen concrete samples-cubes are used followed by building of calibration dependence of "speed of ultrasound/ strength of concrete". Strength of concrete can be improved by using the dependence. According to the second and third versions of the method, speed of ultrasound is measured in at least of ten parts of inspected area of construction followed by measurement of strengths in parts due to drilling cores out of planned pars for testing strength of cores. After that strength of concrete is calculated.

EFFECT: improved precision; improved reliability of measurement.

4 cl, 2 dwg