UNCERTAINTY OF THE ULTRASONIC METHOD FOR DETERMINING THE STRENGTH OF CONCRETE

Authors

Ortagoli Sharipovich Hakimov, Professor, doctor of technical sciences, Tashkent Institute of Architecture and Civil Engineering E-mail: ortagoli@yandex.ru;Follow
Zamira Khudoyberdiyevna Ernazarova, Tashkent State Technical University, Address: 2 Universitetskaya st., 100095, Tashkent city, Republic of Uzbekistan, E-mail: zamira-ernazarova@mail.ru.Follow

Abstract

The issues of measuring the strength of concrete by the method of surface sounding by ultrasound are considered. A measurement model and formulas for estimating the total standard measurement uncertainty, information about the standards used, measurement tools and methods, and environmental parameters are given. Information about the estimation of uncertainty in the form of "eight steps", such as: measurement task; mathematical model of measurement; analysis of input values; observation results; correlations; uncertainty budget; expanded uncertainty; measurement result. It has been established that the uncertainty of type B of the ultrasonic method for determining the strength of concrete is much less than the uncertainty of type A. To facilitate the direct calculation of the value of the total standard uncertainty of the output quantity, generalization and visual presentation of all received and analyzed information about the input quantities in the form of a table - the uncertainty budget. An uncertainty budget can also be used to analyze the contributions from each source of uncertainty to the total uncertainty in order to determine the accuracy of the measurement process, adjust the measurement model, or find ways to reduce the influence of some sources of uncertainty. Assuming a normal distribution with a confidence level of approximately 95% and a coverage factor of k = 2, an expanded uncertainty value is obtained.

First Page

27

Last Page

31

References

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Recommended Citation

Hakimov, Ortagoli Sharipovich and Ernazarova, Zamira Khudoyberdiyevna (2021) "UNCERTAINTY OF THE ULTRASONIC METHOD FOR DETERMINING THE STRENGTH OF CONCRETE," Chemical Technology, Control and Management: Vol. 2021: Iss. 6, Article 4.
DOI: https://doi.org/10.51346/tstu-02.21.6-77-0048