Reseach on ultrasonic rebound intensity curve in Qinzhou area
Four concrete specimens of different strength classes,C25,C30,C35 and C40,were prefabricated using the widely used sand and gravel materials,cement and proportion of mixture in Qinzhou area,and after standard curing for 28 days,rebound,ultrasonic and compressive tests were carried out on the test specimens respectively,and it was concluded that the formula of ultrasonic rebound integrated method gravel aggregate curve in the national has a large error when used in Qinzhou area.According to the polynomial function fcun=aV+bR+c and power function fcuu=aVbRc recommended in the regulation for the fitting of the integrated method strength measurement regression curve,the preliminary establishment of the strength measurement regression curve of the compressive strength of concrete in the Qinzhou area,which has some reference significance to the actual project.
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