Estimation of Concrete Strength of the Colorado Street Bridge Using the Impact-Echo Technique
The impact-echo technique involves introducing mechanical energy, in the form of a short pulse, into a structure. A transducer mounted on the surface of the structure receives the reflected waves, or echoes, from discontinuities in the material and measures motions created by the impact in the time domain. The predominant frequency is read by an FFT Analyzer, and the propagation velocity, which is a function of the frequency and the travel distance through the specimen, is calculated. After the particular relationship between propagation velocity and compressive concrete strength is established from the testing of concrete cores, the mean strength of the concrete throughout the section can be estimated.
KeywordsPropagation Velocity Concrete Strength Pulse Velocity Bridge Pier Compressive Concrete Strength
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