Zastosowanie metody wskaźnika dojrzałości do oceny rozwoju wytrzymałości betonu na ściskanie

• Autorzy: Jonasson J. E. , Retelius A.

Warianty tytułu

EN

Application of the maturity concept for assesment of development of compressive strength of concrete

• Języki publikacji: PL

Abstrakty

PL

Metoda wskaźnika dojrzałości łączy zależność zmiany temperatury dojrzewającego betonu z rozwojem wytrzymałości w czasie. Zastosowania praktyczne podczas wykonywania większości rodzajów konstrukcji z betonu wskazują na przydatność metody wskaźnika dojrzałości, jako sposobu racjonalnego skrócenia czasu wykonania konstrukcji, przy poziomie ufności przewyższającym tradycyjne metody oceny wytrzymałości, takie jak np. badania próbek dojrzewających w warunkach budowy. W artykule przestawiono podstawy metody i wykazano możliwość skrócenia czasu budowy, ze względu na osiągnięcie przez beton wymaganego poziomu wytrzymałości, o ponad 25% w większości przypadków.

EN

The maturity method is a known technique to combine the effect of time and temperature at concrete hardening to evaluate strength growth in structural concretes. The theoretical basis of this technique is known since several decades, but quick and easy systems for effective applications have just recently been developed. The application of the maturity concept has lately been shown to be very effective for almost all structural concreting, which may be generally summarized as a rational way of gaining construction time with higher safety than old techniques like testing small specimens stored near the actual structure on-site. It is shown that the reduction of construction time to reach required strength demands can be reduced by more than 25% in most application cases. The modern systems involve both how to test and establish necessary data for arbitrary concrete mixes as well as using easy tools both to predict strength at the planning phase and during construction follow up the strength growth in the structural concrete in-place. As material data easily can be established for any concrete mix, the developed technique can preferably be used for so called green concretes with replacements of Portland cement with supplementary cementitions material to reduce the carbon footprint of the technology.

Słowa kluczowe

PL

rozwój wytrzymałości w czasie; wskaźnik dojrzałości; wytrzymałość na ściskanie

EN

compressive strength; concrete maturity; strength development

• Wydawca: Instytut Badawczy Dróg i Mostów
• Czasopismo: Drogi i Mosty
• Rocznik: 2011
• Tom: nr 3
• Strony: 23--37
• Opis fizyczny: Bibliogr. 18 poz., rys.

Twórcy

autor

Jonasson J. E.

autor

Retelius A.

• Division of Structural Engineering, Lulea University of Technology, Szwecja

Bibliografia

• [1] Mclntosh J,D.: Electrical curing of concrete. Magazine of Concrete Research, 1, 1, 1949,21-28
• [2] Nurse R.W.: Steam curing of concrete. Magazine of Concrete Research, 1, 2, 1949, 79-88
• [3] SaulA.G.A.: Principals underlying the steam curing of concrete at atmospheric pressure. Magazine of Concrete Research, 2, 6, 1951, 127 - 140
• [4] Bergstrdm S. G,: Curing temperature, age and strength of concrete. Magazine of Concrete Research, 5, 14, 1953, 61 - 66
• [5] RastrupE.: Heat of hydration in concrete. Magazine of Concrete Research, 6,17,1954, 79-92
• [6] Carino N.J., Woodward K.A., Leyendecker E. V., Fattal S. G.: A Review of the Skyline Plaza Collapse. Concrete International, 5, 7, 1983, 35 - 42
• [7] Lew H.S., Fattal S.G., Shaver J.R., Reinhold T.A., Hunt B.J.: Investigation of construction failure of reinforced concrete cooling tower at Willow Island, West Virginia. Final report. Center for Building Technology, National Engineering Laboratory, National Bureau of Standards, Washington D.C. 1979
• [8] Carino N.J., Lew H.S.: The Maturity Method: From Theory to Application. Building of Fire Research Laboratory, National Institute of Standards and Technology, Gaithersburg, 2001, 1-19
• [9] ASTM C 1074: Standard Practice for Estimating Concrete Strength by the Maturity Method. ASTM International, West Conshohocken
• [10] BS EN 13670:2009 European Standard: Execution of concrete structures
• [11] Nykdnen A.: Hardening of Concrete at Different Temperatures, Especially Below the Freezing Point. Proceedings, RILEM Symposium of Winter Concreting: Theory and Practice, Copenhagen 1956
• [12] Freisleben Hansen P., Pedersen E.J.: Maturity Computer for Controlled Curing and Hardening of Concrete. Nordisk Betong, 1,19, 1977, 21-25
• [13] Byfors J.: Plain concrete at early ages. Swedish Cement and Concrete Research Institute, Fo/Research 3:80, Stockholm 1980
• [14] Jonasson J.E.: Slipform Construction - Calculations for Assessing Protection Against Early Freezing. Swedish Cement and Concrete Research Institute, Fo/Research 4:84, Stockholm 1984
• [15] Kanstad T., Hammer T.A., Bjontegaard 0., Sellevold E.J.: Mechanical Properties of Young Concrete - Evaluation of Test Methods for Tensile Strength and Modulus of Elasticity - Determination of Models Parameters. NOR-IPACS Report STF22 A99762, ISBN 82-14-01062-4, Trondheim 1999
• [16] Jonasson J.E.: Modelling of temperature, moisture and stresses in young concrete. Lulea University of Technology, Division of Structural Engineering, Doctoral Thesis 1994.153D, Lulea 1994
• [17] Ekerfors K., Jonasson J.E,: Maturity Development in Young Concrete - Temperature Sensitivity, Strength and Heat Development. Nordic Concrete Research No. 25, 2/2000, 35-47
• [18] ConTeSt-T Program for temperature and strength calculations in concrete. JEJMS Conrete AB, Lulea 2008