road
São Lourenço Bridge
S. Lourenço Bridge – Rehabilitation of the Work of Art
The S. Lourenço Bridge, over the Safarujo River, in the municipality of Mafra, about 500 m from the sea, was built in the 1950s, in reinforced concrete, with a beamed slab deck, with 4 gerber beams and spans of 10+15+10 m.
After carrying out a detailed survey of the work and an inspection and testing campaign supervised by PC&A, several pathologies were identified, highlighting:
- areas of the deck with delaminated concrete, with corrosion of reinforcement, in some places already very pronounced.
- widespread chloride contamination
- ravine of a slope by runoff of rainwater affecting the carriageway.
The following measures were foreseen in the rehabilitation project:
- Removal by chipping of the concrete in the process of delamination, with cleaning of reinforcements or even its replacement in some areas and subsequent replacement with compensated shrinkage mortar;
- Opening and cleaning of expansion joints and installation of bituminous elastomeric material joints;
- Execution of transverse drains to the carriageway at the limits of the deck connected to slope descents near the bridge abutments;
- Painting the entire bridge with acrylic resin-based paint.
Client: EP – Estradas de Portugal EPE
Project: 2005
Completion of the work: 2008