Affiliation:
1. Research institute of concrete and reinforced concrete (NIIZHB) named after A.A. Gvozdev, JSC Research Center of Construction
2. Euphrosyne Polotskaya state university of Polotsk
Abstract
Introduction. The main results of the application of the method of acoustic emission criteria for the diagnosis of the pre-destructive state of reinforced concrete structures are presented. The paper considers the relationship between the origin and growth of microcracks in reinforced concrete beams with deviations of invariant ratios from stable values of acoustic emission parameters.The aim of the research is evaluate the possibility of using the invariant method for the diagnosis of reinforced concrete structures. Refinement of numerical values of time and amplitude invariants, time and amplitude information parameters for reinforced concrete beams. Determination of the relationship of invariants with the scale of destruction in reinforced concrete structures.Materials and methods. Experimental studies were carried out on reinforced concrete beams made of heavy concrete (compressive strength class B60, B90) and fiber concrete (compressive strength class B30, B60). In the process of testing the beams, acoustic emission measurements were carried out, the crack sizes were fixed.Results. The test results allowed us to establish numerical values of time and amplitude invariant criteria, time and amplitude information parameters for reinforced concrete beams. The numerical values of the time invariant have values close to 1, the amplitude invariant has a value of 0,1, and the information parameter of the time intervals and the amplitude information parameter are equal to 0 at the initial stage of loading the samples.Conclusions. Studies have shown the possibility of quantifying the size of cracks (the total length in the control zone) of the structure using the invariant method. The most informative are the time and amplitude invariant criteria.
Publisher
Joint Stock Company Research Center of Construction
Reference15 articles.
1. Builo S.I. Physico-mechanical, statistical and chemical aspects of acoustic emission diagnostics. Rostov-on-Don, Taganrog: SFU Publishing House; 2017. 184 p. ISBN 978-5-9275-2369-6 (In Russian).
2. Builo S.I. On the information value of the method of invariants of acoustic-emission signals in the diagnostics of pre-failure state in materials. Russian Journal of Nondestructive Testing. 2018, no. 4 (54), pp. 237–242. (In English). DOI: https://doi.org/10.1134/S1061830918040034. EDN: YBYEKD
3. Builo S.I. Physico-mechanical, chemical and statistical aspects of acoustic emission. Izvestiya of Altai State University. 2019, no. 1 (105), pp. 11–21. (In Russian). DOI: https://doi.org/10.14258/izvasu(2019)1-01. EDN: YZEBDV
4. Kondranin Ye.A. Definition of the strengthen characteristics of the constructions in terms of the amplitude invariants of the acoustic emission. Izvestiya SFedU. Engineering sciences. 2009, no. 2 (91), pp. 14–19. (In Russian). EDN: KNPFAB
5. Pat. RU2417369C2. Method for determining the limit state of building structures. Sagaidak A.I., declared on 29.06.2009; published on 27.04.2011. (In Russian).