@conference {13377, title = {Reliability of the bond strength of recycled coarse aggregate concrete}, booktitle = {Proceedings of the fib Symposium 2019: Concrete - Innovations in Materials, Design and Structures}, year = {2019}, note = {

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}, month = {May, 27-29, 2019}, pages = {913-920}, address = {Krak{\'o}w, Poland}, abstract = {

An analysis on the effect of the incorporation of coarse recycled concrete aggregates on the bond strength between concrete and embedded steel reinforcement is presented. The model{\textquoteright}s uncertainty of the Level I provision of the anchorage length of fib Bulletin 72 on ribbed steel/recycled aggregate concrete bond is quantified. Afterwards, reliability analyses on the bond strength are made and a partial safety factor for the anchorage length of recycled concrete elements is proposed. The model{\textquoteright}s uncertainty is evaluated through data from pullout tests, the only type of bond test that has been so far performed extensively on recycled aggregate concrete specimens. The limitations of this test in reproducing the bond of actual structural elements is discussed, and the model{\textquoteright}s uncertainty is converted to that of lap splice tests. The bond strength of recycled aggregate concrete design was found to be less reliable than that of natural aggregate concrete, especially in the absence of confining reinforcement. For concrete with full recycled aggregate incorporation, a 25\% increase in the anchorage length is proposed. Additional testing on the bond strength of lapped splices or beam-end specimens is recommended.

}, keywords = {anchorage length, bond strength, model{\textquoteright}s uncertainty, Recycled aggregate concrete, reliability analysis}, author = {Pacheco, Jo{\~a}o and Jorge de Brito and Chastre, Carlos and Evangelista, Lu{\'\i}s} }