TY - JOUR N2 - The paper presents selected issues related to the load carrying capacity of joints between concretes cast at different times. The most important factors affecting the shear resistance, such as: surface roughness (profile), shear reinforcement ratio, concrete strength as well as the aggregate composition are discussed, including results of previous experimental studies conducted on push-off specimens and composite reinforced concrete beams. The differences in behaviour and shear resistance of contacts between ordinary concretes, lightweight aggregate concretes and recycled aggregate concretes are presented. Principles of interface design in the light of codes of practise: AASHTO-LRFD, ACI 318-19, EN 1992-1-1 and prEN 1992-1-1 were described. The theoretical predictions were compared with 184 results of experimental tests on push-off specimens. It has been found that most of the procedures allow for a safe estimation of the load carrying capacity of interfaces – with and without shear reinforcement. However, the obtained results were mostly conservative (depending on the considered design procedure, ratio of the experimental to theoretical load carrying capacity lies in range 1.51÷2.68). This may indicate that the description of shear transfer mechanism between concretes cast at different times is still imperfect and need to be improved. L1 - http://journals.pan.pl/Content/122737/PDF/art16_corr2.pdf L2 - http://journals.pan.pl/Content/122737 PY - 2022 IS - No 1 EP - 298 DO - 10.24425/ace.2022.140168 KW - shear capacity KW - shear-friction KW - push-off test KW - concrete interface KW - concretes cast at differenttime KW - overlay A1 - Gołdyn, Michał PB - WARSAW UNIVERSITY OF TECHNOLOGY FACULTY OF CIVIL ENGINEERING and COMMITTEE FOR CIVIL ENGINEERING POLISH ACADEMY OF SCIENCES VL - vol. 68 DA - 2022.03.30 T1 - Shear capacity of the interface between concretes cast at different time in the light of experimental investigations and codes of practice SP - 275 UR - http://journals.pan.pl/dlibra/publication/edition/122737 T2 - Archives of Civil Engineering ER -