X-Ray CT inspection of subsurface areas of concretes exposed to fast flowing liquids

• Autorzy: Sitek Libor , Hlaváček Petr , Souček Kamil , Bodnárová Lenka , Foldyna Josef , Zajícová Vendula , Berčáková Andrea , Foldyna Vladimír

Identyfikatory

DOI

10.2478/ntpe-2019-0048

• Języki publikacji: EN

Abstrakty

EN

Concrete structures affected for a long time by flowing liquids are exposed to gradual erosion in surface layers caused by a combination of several degradation processes: abrasion, cavitation and chemical or bacterial impacts. Due to the complex phenomena and difficult-to-define initial and boundary conditions, the whole process cannot be easily simulated using the conventional computing tools. Laboratory experimental research is thus the most appropriate approach for the investigation of a suitable composition of concrete resistant to the flowing liquids. However, the methods used are often very time consuming and last even several years. High-speed water flows can be elegantly used for the acceleration of the mechanical simulation of a real situation. Several experiments on the effects of the high-speed water flows on concrete surfaces have been carried out. Using the X-Ray CT methods, subsurface structures of concretes exposed to the accelerated mechanical simulation of the erosion wear caused by fast flowing liquids were investigated and presented in the article. It has been shown that the simulation does not cause initiation of new fractures or cracks in the original concrete structure. The pure water flow mainly removes the hardened cement paste and reveals the aggregate grains. The water flow with abrasive particles disintegrates in greater depths and washes out entire aggregate grains, eventually amputates them and finally smoothens entire surface.

Słowa kluczowe

EN

erosion; concrete; fast flowing liquid; high-speed water jets; X-Ray CT

PL

erozja; konstrukcja betonowa; beton; przepływy wody; badania rentgenowskie

• Wydawca: STE GROUP ; De Gruyter
• Czasopismo: New Trends in Production Engineering
• Rocznik: 2019
• Tom: Vol. 2, Iss. 1
• Strony: 450--459
• Opis fizyczny: Bibliogr. 14 poz., rys.,tab.

Twórcy

autor

Sitek Libor

• Academy of Sciences of the Czech Republic, Czech Republic

autor

Hlaváček Petr

• Academy of Sciences of the Czech Republic, Czech Republic

autor

Souček Kamil

• Academy of Sciences of the Czech Republic, Czech Republic

autor

Bodnárová Lenka

• Brno University of Technology, Czech Republic

autor

Foldyna Josef

• Academy of Sciences of the Czech Republic, Czech Republic

autor

Zajícová Vendula

• Academy of Sciences of the Czech Republic, Czech Republic

autor

Berčáková Andrea

• Academy of Sciences of the Czech Republic, Czech RepublicBerčáková

autor

Foldyna Vladimír

• Academy of Sciences of the Czech Republic, Czech Republic

Bibliografia

• 1. Concrete in Hydraulic Structures. In ACI Committee 210 Report.
• 2. American Society for Testing and Materials (2002). ASTM C 1138-97. Standard test method for abrasion resistance of concrete (underwater method), in: Annual Book of ASTM Standards, vol. 04.02, ASTM, West Conshohocken.
• 3. Horszczaruk, E. K. (2009). Hydro-abrasive erosion of high performance fiber-reinforced concrete. Wear 267, pp. 110-115.
• 4. Horszczaruk, E. K. (2004). Abrasion resistance of high strength fibre-reinforced concrete. 6th RILEM Symposium on Fibre-Reinforced Concretes – BEFIB 2004, Varenna, Italy.
• 5. Binici, H., Aksogan, O., Gorur, E. B., Kaplan, H., Bodur, M. N. (2009). Hydro-abrasive erosion of concrete incorporating ground blast-furnace slag and ground basaltic pumice. Construction and Building Materials 23, pp. 804-811.
• 6. Hlaváček, P., Sitek, L., Hela, R., Bodnárová, L. (2019a). Erosion Test with High-speed Water Jet Applied on Surface of Concrete Treated with Solution of Modified Lithium Silicates. In: Advances in Manufacturing Engineering and Materials. Lecture Notes in Mechanical Engineering, Basel: Springer Nature Switzerland AG 2019, pp. 135-143. Available at: https://link.springer.com/chapter/10.1007/978-3-319-99353-9_15.
• 7. Momber, A. W., Mohan, R. S., Kovacevic, R. (1999). On-line analysis of hydro-abrasive erosion of pre-cracked materials by acoustic emission. Theoretical and Applied Fracture Mechanics 31, pp. 1-17.
• 8. Hu, X.G., Momber, A.W., Yin, Y.G. (2002). Hydro-abrasive erosion of steel-fibre reinforced hydraulic concrete. Wear 253, pp. 848-854.
• 9. Momber, A. W. (2016). A probabilistic model for the erosion of cement-based composites due to very high-speed hydro-abrasive flow. Wear 368, pp. 39-44.
• 10. Momber, A. W. (2017). Effects of erodent flow energy and local exposure time on the erosion of cement-based composites at high-speed hydro-abrasive flow. Wear 378-379, pp. 145-154.
• 11. Sitek, L., Hlaváček, P., Bodnárová, L. (2018). Use of high-speed water flows for accelerated mechanical modelling of erosive wear of concrete surfaces. In: MATEC Web of Conferences 244, 02007 (2018). Innovative Technologies in Engineering Production (ITEP’18), Bojnice, Slovakia. Available at: https://doi.org/10.1051/matecconf/201824402007.
• 12. Sitek, L., Bodnárová, L., Souček, K., Staš, L., Gurková, L. (2015). Analysis of Inner Structure Changes of Concretes Exposed to High Temperatures using Micro X-ray Computed Tomography. Acta Geodynamica et Geomaterialia, Vol. 12, No. 1 (177), 79-89.
• 13. Hlaváček, P., Sitek, L., Klichová, D., Bodnárová, L. (2019b). Effects of abrasives during the accelerated simulation of mechanical corrosion of cement-based composites using the abrasive water flow. Acta Polytechnica CTU Proceedings, Vol. 22 (2019). In print.
• 14. Klich J., Hlaváček, P., Ščučka, J., Sitek, L., Foldyna, J., Georgiovská L., Souček, K., Staš, L., Bortolussi, A. (2013). Processing and finishing of granite surfaces. MONOGRAFIA Nowoczesne metody eksploatacji węgla i skał zwięzłych. AGH, Kraków 2013, pp. 36-43.

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).