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Design criteria for early-age bond strength in reinforced concrete

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Abstract

The main objective of the extensive research programme involving 238 test specimens was to provide bond strength criteria between type 2 deformed bars and concrete in models for predicting early-age rracking. The major variables included bar diameter, concrete cover, age of concrete, transverse reinforcement and anchorage length. Both the pull-out load and slip displacement were determined using specially developed tensile bond tests where both steel and concrete were in tension. The bond strength of deformed bars showed a significant age effect and design equations suitable for toth ultimate and serviceability limit states at early age have been developed. BS 8110 and BS 8007 Code values underestimated the ultimate bond strength for the concrete strengths considered, while the same values from BS 8110 and BS 8007 overestimated or compared approximately with, respectively, the average bond stress test results at 0.1 mm slip. AC1-318 Building Code, on the other hand, overestimated the bond strength for concrete cube strengths up to 15 MPa and then became conservative.

Resume

On a réalisé un vaste programme de recherche sur 238 éprouvettes, dont l'objectif principal était d'obtenir des critères d'adhérence entre des barres déformées de type 2 et le béton dans des modèles permettant de prévoir la fissuration aux jeunes âges. Les principales variables étaient: le diamètre de la barre, l'enrobage du béton, son âge, le renforcement transversal et la longueur de l'ancrage. On a déterminé à la fois la charge d'arrachement et la longueur de glissement par des essais d'adhérence où l'acier comme le béton étaient soumis à la traction. On a constaté l'importance de l'âge des barres, et on a établi des équations variables à la fois pour les états limites ultimes et en service aux jeunes âges. Les valeurs de calcul données par BS 8110 et BS 8007 sous-estiment l'adhérence maximale pour les résistances du béton considérées, tandis que les mêmes valeurs extraites des mêmes documents surestimaient ou rejoignaient à peu près la moyenne des résultats d'essai de la contrainte d'adhérence pour un glissement de 0,1 mm. D'autre part, ACI-318 surestime l'adhérence pour des résistances sur cubes du béton allant jusqu'à 15 MPa, et, au-delà, devient normal.

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Abbreviations

f cu :

Concrete cube strength

f cy :

Concrete cylinder strength

f*et :

Direct tensile strength of concrete

f′ ct :

Indirect tensile strength of concrete (cylinder splitting strength)

f b1 :

Average bond stress for 0.1 mm slip

f b2 :

Average bond stress for 0.2 mm slip

f bu :

Average bond strength at ultimate between steel and concrete

f s1 :

Tensile stress in the steel reinforcement for 0.1 mm slip

f s2 :

Tensile stress in the steel reinforcement for 0.2 mm slip

ϕ:

Diameter of a reinforcing bar

ρ c :

Steel ratio based on gross area of concrete

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Authors and Affiliations

  1. School of Civil Engineering, University of Birmingham, Edgbaston, B15 2TT, Birmingham, UK

    B. P. Hughes

  2. School of Civil Engineering, Catholic University of Chile, Casilla 6177, Santiago, Chile

    C. Videla

Authors
  1. B. P. Hughes
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  2. C. Videla
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Hughes, B.P., Videla, C. Design criteria for early-age bond strength in reinforced concrete. Materials and Structures 25, 445–463 (1992). https://doi.org/10.1007/BF02472635

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