April 2026: INSPECTION OF THE SLUNJČICA BRIDGE

Obrisani Korisnik — Thu, 30 Apr 2026 08:03:42 GMT

The field investigation of the bridge over the Slunjčica River in Slunj (Rastoke) was carried out on April 28, 2026. In addition to a visual inspection, non-destructive testing was performed at several accessible locations on the bridge: on the arch, on the piers, and on the underside of the deck structure. A cover meter (profometer) was used to determine the location, spacing, and diameter of reinforcement, as well as the concrete cover thickness. Ultrasonic testing was applied to assess the homogeneity of the concrete and to estimate its modulus of elasticity. A rebound hammer (Schmidt hammer) was used to estimate the compressive strength of the concrete. Electrical resistivity of the concrete was measured using a resistivity meter, while half-cell potential measurements were conducted using the profometer to assess the probability of reinforcement corrosion. Below are some images from the field investigation:

Team gathering in front of the bridge

Detection of reinforcement layout, spacing, diameter, and concrete cover on a bridge pier using a profometer

Detection of reinforcement location, spacing, and diameter, as well as determination of concrete cover on the underside of the deck structure using a profometer

Ultrasonic testing for determining the modulus of elasticity of the pier concrete

Estimation of compressive strength of the arch concrete using a rebound hammer

Measurement of the pier concrete electrical resistivity using a resistivity meter

Half-cell potential measurement at the interface between the pier and the arch using a profometer

Half-cell potential measurement on the underside of the deck slab using a profometer

March 2026: PREPARATIONS FOR THE INSPECTION OF THE SLUNJČICA BRIDGE ARE UNDERWAY

Obrisani Korisnik — Thu, 30 Apr 2026 08:03:01 GMT

During the first few months of the project, we reviewed the archives of the Chair of Bridges and identified the Slunjčica Bridge as a representative arch bridge (WP1) that will be the focus of our further research. Based on our previous studies, arch bridges are of particular interest regarding their seismic behaviour. Furthermore, the bridge location and the use of de-icing salts during winter months require investigation of potential bridge degradation due to corrosion.

Currently, we are collecting all available documentation on the bridge from the archives and preparing for the inspection of the Slunjčica Bridge to determine the structural condition and collect data relevant for engineering load analysis (WP2), bridge degradation assessment (WP3), and numerical modelling and simulations (WP4). We are analysing the bridge documentation and preparing the sequence and the scope of the visual inspection and non-destructive testing of the arch, piers, and the underside of the superstructure.

For non-destructive testing, we will use the following existing equipment:

Ultrasonic pulse velocity testing device V-Meter Mark IV
https://www.croris.hr/oprema/oprema/5427
Profometer 630 AI – device for reinforcement detection, determination of concrete cover, reinforcement diameter, and half-cell potential measurements
https://www.croris.hr/oprema/oprema/5428
Schmidt rebound hammer (sclerometer)
https://www.croris.hr/oprema/oprema/5430
Resipod – device for measuring the electrical resistivity of concrete
https://www.croris.hr/oprema/oprema/5429
Crack width microscope
https://www.croris.hr/oprema/oprema/5431

We have received permission from the road authority Hrvatske ceste d.o.o., responsible for the management, construction, and maintenance of state roads, to carry out the bridge inspection for research purposes. We would like to express our gratitude for their support and cooperation.

Građevinski fakultet - News

April 2026: INSPECTION OF THE SLUNJČICA BRIDGE

March 2026: PREPARATIONS FOR THE INSPECTION OF THE SLUNJČICA BRIDGE ARE UNDERWAY