Wpływ chlorków na mikrostrukturę betonu w warunkach cyklicznego zamrażania i rozmrażania

• Autorzy: Li M. , Zhang Y. , Wu Z. , Qian C. , Sun W.

Warianty tytułu

EN

Effect of chloride salt and freeze-thaw cycling on the microstructure of concrete

• Języki publikacji: PL

Abstrakty

PL

Chlorkowe sole odladzające działające w warunkach cyklicznego zamrażania i rozmrażania są przyczyną poważnych uszkodzeń betonu. W pracy badano zmiany modułu sprężystości, masy próbek i ich porowatość w oparciu o metodę ultradźwiękową, skaningową mikroskopię elektronową oraz porozymetrię rtęciową. Wyniki badań wykazują utratę masy próbek, jak również spadek modułu sprężystości ze wzrostem liczby cykli zamrażania i rozmrażania, czasu przetrzymywania w minimalnej temperaturze i zawartością soli odladzającej.

EN

Chloride deicer and freeze-thaw cycles can cause serious damage of concrete. The relative dynamic elastic modulus, weight loss and porosity were measured by using ultrasonic testing method, Scanning Electron Microscopy and Mercury Intrusion Porosimetry. The microstructure change of concrete under the action of chloride salt and freeze-thaw cycling were analyzed. The results showed that the weight loss and the relative dynamic elastic modulus are decreasing with the salt deicer use and freeze-thaw cycles.

Słowa kluczowe

PL

beton; zamrażanie-odmrażanie cykliczne; chlorki; mikrostruktura

EN

concrete; cyclic freezing-thawing; chlorides; microstructure

• Wydawca: Fundacja Cement, Wapno, Beton
• Czasopismo: Cement Wapno Beton
• Rocznik: 2013
• Tom: R. 18/80, nr 2
• Strony: 74--80
• Opis fizyczny: Bibliogr. 16 poz., il., tab.

Twórcy

autor

Li M.

• Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing, Chiny
• International Institute for Urban System Engineering, Southeast University, Nanjing, Chiny

autor

Zhang Y.

• Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing, Chiny

autor

Wu Z.

• International Institute for Urban System Engineering, Southeast University, Nanjing, Chiny

autor

Qian C.

• Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing, Chiny

autor

Sun W.

• Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing, Chiny

Bibliografia

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• 4. Veas Penttala, Fahim Al-Neshawy, Stress and strain state of concrete during freezing and thawing cycles, Cem. Concr. Res. 32, 1407–1420 (2002).
• 5. T. C. Powers, A Working Hypothesis for Further Studies of Frost Resistance of Concrete, RX005, Portland Cement Association, 245-272, Chicago 1945.
• 6. T. C. Powers, The Air Requirement of Frost-Resistant Concrete, Proceedings of the Highway Research Board, Portland Cement Association, Bulletin, 33, 1-8 (1949).
• 7. T. C. Powers, T. L. Brownyard, „Studies of the Physical Properties of Hardened Portland Cement Paste. IV. The Thermodynamics of Adsorption of Water on Hardened Paste,” Journal of the American Concrete Institute 18, 549-602 (1947).
• 8. T. C. Powers, R. A. Helmuth, Theory of Volume Changes in Hardened Portland Cement Paste During Freezing, Proceedings of the Highway Research Board, 32, 285 (1953).
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• 10. Andrzej Cwirzen, Aggregate–cement paste transition zone properties affecting the salt–frost damage of high-performance concretes. Cem. Concr. Res. 35, 671–679 (2005).
• 11. Vesa Penttala, Surface and internal deterioration of concrete due to saline and non-saline freeze–thaw loads, Cem. Concr. Res. 36, 921 – 928 (2006).
• 12. Olivier Coussy, Paulo J. M. Monteiro, Poroelastic model for concrete exposed to freezing temperatures, Cem. Concr. Res. 38, 40–48 (2008).
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• 14. China Academy of Building Research, Standard for test method of longterm properties and durability of ordinary concrete(GBJ82-- 85), BeiJing, Standards Press of China, 2005.12.
• 15. R. Mu, Durability and Service Life Prediction of Concrete Subjected to the Combined Action of Freezing-Thawing, Sustained External Flexural Stress and Salt Solution, Southeast university Ph.D. Dissertation, NanJing 2000.
• 16. Z. W. Wu, L. H. Lian: High Performance Concrete[M]. BeiJing, Atomic Energy Press 2000.