The main innovation of this research is the proposed combination of:

• Laboratory experiments on permeability of cracked and un-cracked concrete

• Visual inspection and non-destructive testing  (measurements of cracks and chloride content in concrete and half-cell potential of steel rebar) on the existing bridges

• Numerical modelling of chloride induced corrosion of steel in cracked concrete

Concrete bridges selected for inspection and NDT in the framework of this research:

• Maslenica Motorway Bridge

• Šibenik Bridge

• Bridge across Krapina River in Žeinci

• Homland Bridge across Sava River in Zagreb

• Adriatic Bridge across Sava River in Zagreb

• Bridge of Youth across Sava River in Zagreb

Following quantitatively measured outcomes of the project and the potential users are expected:

• Results and conclusion of: (i) visual inspection of the selected concrete bridges, (ii) measurements of chlorides content in concrete, (iii) measurements of cracks and damages in concrete,  (iv) measurements of the half-cell potential of steel rebar and electrical resistivity of concrete on the selected bridges will provide useful information to bridge owners in order to optimize maintenance programme. Moreover, new knowledge as results of analyses of measured results will be useful to scientists focused on the all aspects of the deterioration of concrete bridges exposed to chlorides.

• The 3D chemo-hygro-thermo mechanical model, improved by new knowledge as result of experiments and measurements, can be used (i) for new research, independently or as a support to experiments; and (ii) in engineering practice, especially to design and and ensure durability of significant bridges with service life of 100 years or more.

• The experimental results and improved model of concrete permeability as a function of crack width will be of great use to researchers dealing with issues of transport processes in concrete.

• Recommendations for the management of concrete bridges exposed to chlorides, as result of measurements on the bridges and numerical simulations,  will be useful to professional engineers engaged in design, construction and maintenance of new and bridges, but also in rehabilitation of damaged structures.