The effect of ribbed reinforcing bars location on their bond with high-performance concrete

• Autorzy: Dybeł P. , Furtak K.

Identyfikatory

DOI

10.1016/j.acme.2015.03.008

• Języki publikacji: EN

Abstrakty

EN

This paper deals with the effect of reinforcing bars location on high-performance concrete–rebars bond. The results of research have proved that the increased distance of the reinforcement from the formwork bottom (a larger layer of concrete below the bar) decreases the bond. The physical bases of the phenomenon are related with a special form of bleeding in which process a portion of water is transported towards the upper surface of concrete mix. The modified microstructure and different mechanical properties of high-performance concrete result in the fact that the maximum bond differences between the area of “good” and “poor” bond conditions are much smaller than in normal concretes. Following the results of experimental research it can be stated that concrete-upper bars bond reduction quoted in standard guidelines is rather conservative. Therefore, it has been found advisable to determine new criteria of bond conditions assessment for high-performance concrete.

Słowa kluczowe

EN

bond; casting position; anchorage length; high-performance concrete; silica fume

PL

beton; pręty zbrojeniowe; krzemionka

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2015
• Tom: Vol. 15, no. 4
• Strony: 1070--1077
• Opis fizyczny: Bibliogr. 22 poz., rys., tab., wykr.

Twórcy

autor

Dybeł P.

• AGH University of Science and Technology, Department of Geomechanics, Civil Engineering and Geotechnics, Al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Furtak K.

• Cracow University of Technology, Department of Building Bridges and Tunnels, ul. Warszawska 24, 31-155 Kraków, Poland

Bibliografia

• [1] A. Azizinamini, M. Stark, J.J. Roller, S.K. Ghosh, Bond performance of reinforcing bars embedded in high-strength concrete, ACI Structural Journal 90 (5) (1993) 554–561.
• [2] B. Brettmann, D. Darwin, R. Donahey, Bond of reinforcement to superplasticized concrete, ACI Journal 83 (1) (1886) 98–107.
• [3] A. Castel, T. Vidal, K. Viriyametanont, R. Francois, Effect of reinforcing bar orientation and location on bond with self-consolidating concrete, ACI Structural Journal 103 (4) (2006) 559–567.
• [4] P. Dybeł, Czynniki wywierające istotny wpływ na przyczepność betonów wysokowartościowych do stali zbrojeniowej, in: IV Krakowska Konferencja Młodych Uczonych, 2009, 37–43.
• [5] P. Dybeł, K. Furtak, Effect of silica fume content on the bond stiffness of reinforcement bars in high-performance concrete, Cement-Wapno-Beton XIX/LXXXI (2) (2014) 106–113.
• [6] P. Dybeł, K. Furtak, Assessment of the casting position factor in reinforced concrete elements in view of experimental studies, Archives of Civil Engineering 60 (2) (2014) 209–221.
• [7] B.S. Hamad, R.A. Akik, Role of casting position on bond strength of reinforcement in eccentric pullout silica fume concrete specimens, Materials and Structures 34 (3) (2001) 163–171.
• [8] B.S. Hamad, M.S. Itani, Bond strength of reinforcement in high-performance concrete: the role of silica fume, casting position, and superplasticizer dosage, ACI Material Journal 95 (5) (1998) 499–511.
• [9] K. Holschemacher, F. Dehn, D. Weiße, Influence of the rebar position on the bond behaviour in high-strength concrete, Leipzig Annual Civil Engineering Report, No. 7, 2002, 135–144.
• [10] S.J.A. Hosseini, K. Koushfar, A.B.A. Rahman, M. Razavi, The bond behaviour in reinforced concrete, state of the art, Cement-Wapno-Beton XIX/LXXXI (2) (2014) 93–105.
• [11] P.R. Jaunty, D. Mitchell, M.S. Mirza, Investigation of top bar effects in beams, ACI Material Journal 85 (3) (1988) 251–257.
• [12] J.O. Jirsa, J.E. Breen, Influence of Casting Position and Shear on Development and Splice Length – Design Recommendation. Research Report No. 242-3F, Center for Transportation Research, The University of Texas at Austin, 1981.
• [13] J.J. Luke, B.S. Hamad, J.O. Jirsa, J.E. Breen, The Influence of Casting Position on Development and Splice Length of Reinforcing Bars. Research Report No. 242-1, Center for Transportation Research, Bureau of Engineering Research, University of Texas at Austin, 1981.
• [14] J. Pędziwiatr, Podstawowe zagadnienia przyczepności stali i betonów w elementach żelbetowych, in: Prace Naukowe Instytutu Budownictwa Politechniki Wrocławskiej nr 88, 2007.
• [15] D. Weiße, K. Holschemacher, Some aspects about the bond of reinforcement in ultra high strength concrete, Leipzig Annual Civil Engineering Report, No. 8, 2003.
• [16] AASHTO, LRFD Highway Bridge Design Specifications, American Association of State Highway and Transportation Officials, Washington, 2007.
• [17] ACI Committee 318, Building Code Requirements for Structural Concrete (ACI 318-08), American Concrete Institute, 2008.
• [18] CEB-FIP, Task group bond model, Bond of reinforcement in concrete. State-of-art report. Bulletin 10, 2000.
• [19] Eurocode 2, Design of concrete structures – Part 1-1: General Rules, and Rules for Buildings, UNI–ENV 1992–1–1, European Committee for Standardization, 2008.
• [20] EN 10080, Steel for the reinforcement of concrete, 2007.
• [21] fib, Bulletin No. 65, Model Code 2010 – Final draft Volume 1, 2012.
• [22] RILEM/CEB/FIP, Technical recommendations for the testing and use of construction materials, E&FN Spon, U.K., 1983.