IMPROVEMENT OF THE METHOD OF ASSESSMENT OF STRENGTH OF CEMENT CONCRETE AT INDIRECT MEASUREMENTS BY NON-DESTRUCTIVE CONTROL METHODS
DOI:
https://doi.org/10.31649/2311-1429-2021-1-42-51Keywords:
non-destructive method (sclerometer), nomogram, plastic deformation, elastic rebound, separation, rib chippingAbstract
More than 20,000 thousand non-destructive tests were carried out on construction sites from 2016 to 2021, for timely control of the strength of precast concrete structures, and further decision-making on the loading of the concrete element. the nomogram of determination of compressive strength Rst, MPa according to measurements on the scale of the sclerometer RM is given. According to the results of approximation of tables of passport data of the device it is received that compressive strength Rst, MPa. according to measurements on the scale of the sclerometer RM varies according to the power law The results of tests of cement-concrete samples with strength from 31.5 to 51.5 MPa are given. The method of tests by indirect non-destructive testing methods to determine the compressive strength of cement concrete is specified. Statistical processing of test data was performed. Based on the results of research, Recommendations for assessing the strength of cement concrete based on the results of non-destructive testing (sclerometer) have been developed.
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