Izvorni znanstveni članak
https://doi.org/10.2478/otmcj-2023-0018
Optimised technology for repair of vertical surface of concrete bridge elements
Marijan Skazlić
Berislav Borovina
Ivan Gabrijel
Sažetak
A large number of concrete bridges need to be
repaired due to durability problems. This research focuses
on evaluating the bond quality of the repair material,
which has the highest influence on the durability of the
repair. Onsite experimental research is performed on the
vertical surfaces of the column of the Klara Jug bridge,
which is located in the southern part of the Zagreb. Since
the experimental research is carried out in parallel with
the ongoing repair works on other bridge elements, the
experimental conditions correspond to the real construction site conditions. Simulation of the actual site rehabilitation process was carried out on the test fields, which
included removal of the damaged concrete by hydrodemolition at a depth of 1.5–2 cm, washing of the concrete
by roto nozzle and wet spraying of the repair mortar. The
results of the pull-off tensile bond strength show that
there is an optimum period for spraying of repair mortar
after washing the concrete surface. Optimal time for application of mortar is 90 min after completion of washing of
the vertical concrete surface by the roto nozzle. In other
weather conditions, the application time depends on
the expected evaporation of water from the surface. The
tensile strength of the bond between concrete and the
repair mortar is 62% lower if the concrete is not washed
by the roto nozzle prior to the application of the repair
mortar. This investigation can serve as a practical guide
for the repair of vertical surface of concrete elements of
bridges, overpasses and viaducts.
Ključne riječi
bridge, concrete repair, durability, hydrodemo lition, pull-off tensile strength, repair mortar
Hrčak ID:
321177
URI
Datum izdavanja:
1.1.2023.
Posjeta: 62 *