Notice: Undefined index: linkPowrot in C:\wwwroot\wwwroot\publikacje\publikacje.php on line 1275
[99620] Artykuł: Acoustic Emission for Determining Early Age Concrete Damage as an Important Indicator of Concrete Quality/Condition before LoadingCzasopismo: Materials Tom: 13, Zeszyt: 16, Strony: 1-16ISSN: 1996-1944 Opublikowano: Sierpień 2020 Autorzy / Redaktorzy / Twórcy Grupa MNiSW: Publikacja w czasopismach wymienionych w wykazie ministra MNiSzW (część A) Punkty MNiSW: 140 Pełny tekst DOI Web of Science Słowa kluczowe: młody beton  metoda emisji akustycznej  wykrywanie procesów destrukcyjnych przed obciążeniem  wytrzymałość betonu  Keywords: early age concrete  acoustic emission method  damage processes detection before loading  strength of structures  |
Phenomena occurring during the curing of concrete can decrease its mechanical properties, specifically strength, and serviceability, even before it is placed. This is due to excessive stresses caused by temperature gradients, moisture changes, and chemical processes arising during the concreting and in hardened concrete. At stress concentration sites, microcracks form in the interfacial transition zones (ITZ) in the early phase and propagate deeper into the cement paste or to the surface of the element. Microcracks can contribute to the development of larger cracks, reduce the durability of structures, limit their serviceability, and, in rare cases, lead to their failure. It is thus important to search for a tool that allows objective assessment of damage initiation and development in concrete. Objectivity of the assessment lies in it being independent of the constituents and additives used in the concrete or of external influences. The acoustic emission-based method presented in this paper allows damage detection and identification in the early age concrete (before loading) for different concrete compositions, curing conditions, temperature variations, and in reinforced concrete. As such, this method is an objective and effective tool for damage processes detection.