Ultrasonic- The Rebound Synthesis In Qingdao Area Concrete Compressive Strength Technology Research Applications

Along with the development of construction engineering quality detection technology is becoming more and more perfect, the unified standard for constructional quality acceptance of building engineering in sixteen words guiding ideology of "separation of test and assessment, strengthen inspection, improve the process control means," the specific application in the project can be achieved, "perfected" the guiding ideology in the engineering quality acceptance will show the more and more important position; using scientific data to judge, to avoid the interference of human factors and reduce the impact of subjective evaluation, and supervision norms "parallel inspection" to increase detection means perfect control, provide a guarantee for acceptance of construction quality of the integrity of the structure and function.Concrete surface measurement of rebound method strength inside only, can not know, when the strength of concrete is low, the larger plastic deformation, the rebound value changes between concrete surface strength is not obviously; ultrasonic wave velocity in concrete can reflect the change of strength of concrete, but for high strength the variation of wave velocity with the strength of concrete, the not so obvious. If the rebound method, ultrasonic method, combining with two kinds of methods, learn from each other the establishment of ultrasonic wave through the experimental value- correlation between the strength of concrete rebound, with two parameters to evaluate the strength of the concrete, the comprehensive method of ultrasonic and rebound. Inspection of concrete strength by ultrasonic method fully reflects the internal ultrasonic process of material of concrete average strength, and resilient method only reflects the strength of concrete surface layer. Measurement of ultrasonic method and rebound method to test concrete strength value is compensated for each other, to eliminate the influence of carbonation factors. Experiments show that: the ultrasonic rebound method detecting the structure and component of the accuracy and reliability of concrete strength is higher than that of the single ultrasonic and rebound method. Therefore, widely used in concrete quality control and detection of the structure and component of concrete strength.The comprehensive method is the use of two kinds of minimal damage to the components, using a physical index components, a start from the surface hardness, from surface to inside the side reaction of concrete compressive strength and more comprehensive, because Is the strength indexes of side reaction of concrete, so it has good correlation.Through the experiment of ultrasonic velocity, rebound value of concrete strength of the relationship between, with two parameters to evaluate the strength of concrete by ultrasonic rebound synthetic method, namely, the practice shows that the method is a more mature, reliable concrete strength testing method. Therefore, this research through the test with the establishment of the special curve of concrete strength by ultrasonic determination of rebound method, and the preparation of maintenance with condition consistent with the structure of solid block, the regression equation established on the basis of standard curing modified. Calculate structural entity using the regression equation of the modified strength.