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Dynamic elastic properties of hardened experimental mortar bars affected by accelerated alkali–silica reactivity test: a laboratory approach
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SYSNO ASEP 0550773 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Dynamic elastic properties of hardened experimental mortar bars affected by accelerated alkali–silica reactivity test: a laboratory approach Author(s) Lokajíček, Tomáš (GLU-S) RID, SAI, ORCID
Petružálek, Matěj (GLU-S) RID, SAI, ORCID
Svitek, Tomáš (GLU-S) SAI, RID
Kuchařová, A. (CZ)
Šachlová, Š. (CZ)
Přikryl, R. (CZ)Source Title Bulletin of Engineering Geology and the Environment. - : Springer - ISSN 1435-9529
Roč. 80, č. 12 (2021), s. 8921-8933Number of pages 13 s. Language eng - English Country DE - Germany Keywords Alkali silica reactivity ; Laboratory experiments ; Dynamic elastic properties OECD category Civil engineering R&D Projects GA18-08826S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support GLU-S - RVO:67985831 UT WOS 000642839800002 EID SCOPUS 85105130456 DOI 10.1007/s10064-021-02251-0 Annotation The evaluation of ASR sensitivity of aggregates is of utmost importance due to durability and safety of structures and also due to economic reasons related to repairs or replacements of ASR-affected concrete. Laboratory tests for ASR detection rely mostly on petrographic examination and on laboratory expansion tests. The latter are mostly expressed in terms of length change (expansion) of experimental mortar bars subjected to the effect of alkaline environment. Along with this, recording of the propagating ultrasonic wave signal can increase reliability of test results. In the recent study, dynamic elastic properties of experimental mortar bars were recorded in both normal setting/hardening state (first 28 days) and in the conditions of accelerated ageing conditions in alkaline solution with elevated temperature (another 37 days). Setting/hardening of the studied materials under normal conditions was manifested by quasi-exponential P- and S-wave ultrasonic velocity increase. However, alkaline solution resulted in the rapid development of ASR phenomena in reactive aggregates and significant change of elastic wave velocities and other dynamic elastic parameters. Comparing various ultrasonic characteristics, dynamic ones (amplitudes, frequencies) proved significantly higher sensitivity and tighter correlation to length changes (expansion) cause by ASR than did the kinematic ones (elastic wave velocities, dynamic elastic moduli). Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2022 Electronic address https://link.springer.com/article/10.1007%2Fs10064-021-02251-0
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