FIELD: test engineering.
SUBSTANCE: method comprises surface sounding of the structure in longitudinal and transverse directions, measuring time of propagation of ultrasonic waves in these directions at negative temperatures of ambient air, determining mean humidity of concrete in the direction transverse to the direction of preliminary stressed reinforcement and mean humidity of concrete in the direction along the preliminary stressed reinforcement, and calculating concrete strength depending on humidity from the equation proposed.
EFFECT: enhanced reliability.
2 dwg
