Abstract
The article presents the results of research and experimental studies aimed at measurement of crack growth speed in concrete of different types and composition. The study included complex methods to measure the parameters of concrete destruction under the impact of mechanic loads and aggressive factors. The experiments were performed using mechanics of damage methods and acoustic measurement of such parameters as acoustic emission gross counting and counting rate. The experiments resulted in regression equations showing change of acoustic emission gross counting depending on the speed of a specimen loading. Data on slow growth of cracks in heat-resistant concrete during heating up to 800°C have been obtained by acoustic emission and mechanics of damage methods. The performed studies and statistic processing of the obtained data allowed identifying that parameters of acoustic emission are directly related to the characteristics of mechanics of damage that reveals a considerable capacity of acoustic emission as a method for forecasting destruction of concrete.
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