An Ultrasonic Method of Deterioration and Cracking in Concrete Structures
J. R. Leslie abd W. J. Cheesman
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A new method and apparatus for field and laboratory testing of concrete is described. The appartus is called the "Sonicscope" was originally designed to detect internal cracks in concrete. It develops pulses of ultrasonic sound in the material and measures the velocity of their transmission through it. This pulse velocity has the unique advantage of being independent of the size and shape of the body under test. Measurements can be made with equal facility in mass concrete, slabs or laboratory specimens. The existance and extent of internal cracks and depth of visible surface cracks can be determined by the use of this apparatus. The velocity has been found, by experiment, to be a reliable measure of the condition of the concrete and is particularly useful in deterioration studies. The dynamic modulus can be calculated from this velocity, and values so obtained are found to agree closely with the results of the tests using established methods.