From Realtà Mapei International n° 82 - 11/17/2020

Repair and strengthening works on the spiral ramp of the San Giorgio Bridge in Genoa

Repairing, strengthening and waterproofing the spiral ramp that connects the bridge to the A7 Motorway.

Location icon Genoa

An access ramp connects the San Giorgio Bridge to the A7 Motorway on the Eastern side. This spiral viaduct provides access for traffic coming from the bridge onto the motorway that runs towards the lower Piedmont and Lombardy regions. Repair and strengthening work was carried out on all parts of the viaduct and various Mapei products were used for repairing, strengthening and waterproofing its elements.

 

CONCRETE REPAIR AND STRENGTHENING
MAPEFER 1K cementitious mortar was applied on the steel reinforcement to prevent corrosion and MAPEGROUT EASY FLOW one component, fibre-reinforced thixotropic mortar was used to repair the concrete structures. In those areas where a higher level of ductility was required, the team decided to opt for MAPEGROUT EASY FLOW GF, hi-flow cementitious mortar reinforced with inorganic fibres.
The hi-flow, fibre-reinforced, compensated-shrinkage mortars MAPEGROUT HI-FLOW B2 and MAPEGROUT GF BETONCINO B1 were used for repairing concrete.
MAPELASTIC GUARD, a two-component, elastic cementitious mortar, was used for waterproofing the concrete surfaces.

The following products also came into use: MAPEGROUT LM2K, thixotropic, fibre-reinforced, cementitious mortar for concrete repair; ADESILEXPG1, thixotropic epoxy adhesive for structural bonding; EPOJET, superfluid epoxy resin for injections and anchoring, and MAPEFIX EP 585, pure epoxy resin-based chemical anchor for structural loads.

WATERPROOFING THE DECK
The deck of the access ramp was waterproofed by applying PURTOP 400 M SYSTEM DECK, a complete waterproofing system which is CE marked in compliance with ETAG033 guidelines. 

PRIMER SN two component, fillerized epoxy primer was used to treat the concrete substrate, before broadcasting QUARTZ0.5. Then, PURTOP 400 M hybrid polyurea membrane was applied to waterproof the surfaces, followed by the application of PURTOP PRIMER BLACK, a solvent-based primer that improves adhesion of asphalt surfaces waterproofed with products fromthe PURTOP line.

 

FINISHING THE SURFACES
The surfaces were finished off by applying MAPECOAT E23, an epoxy primer used to protect concrete before applying polyurethane finishing products, MAPECOAT PU33, a polyurethane resin-based, flexible coating for protecting concrete, MALECH, an acrylic, water-based primer used to even out surfaces and promote adhesion, and ELASTOCOLOR PAINT, an elastomeric paint for the crack bridging protection of internal andexternal surfaces, with permanent elasticity and a high level of resistance to chemicals.

Project data sheet

Yard concrete viaduct
Location Genoa, Italy
Subcategory VIADUCT
Built in 2019
Opened in 2020
Application supply of admixturs for concrete, mortars and waterproofers
Start and finish date 2019/2020
Application Type Supplying of admixtures
Client Commissario Straordinario per la Ricostruzione
Contractor company PER GENOVA (Salini Impregilo Spa; Fincantieri; Infrastructure Spa)
Installer companies COSSI COSTRUZIONI SPA
Architects RPBW Renzo Piano Building Worksop
Designers (for works) RPBW Renzo Piano Building Worksop
Credits Sergio Tani
Project Manager ING STEFANO MOSCONI
MAPEI Coordination Zaffaroni, Lattarulo, Broggio, Zamorani, Siboni, Citton, Ferrari, Rossi, Profili, Dimilito, Lanzini, Iliev, Calò

Products mentioned in the article

ADESILEX PG1
ADESILEX PG1
Two-component, rapid-setting thixotropic adhesive for structural bonds. TECHNICAL DATA: Mixing ratio: comp. A : comp. B = 3 : 1. Pot life…
ELASTOCOLOR PAINT
ELASTOCOLOR PAINT
Elastomeric, crack-bridging, permanently flexible, protective paint with high resistance to chemicals for internal and external surfaces.…
EPOJET
EPOJET
Two-component, super-fluid epoxy resin for injections and anchorings. TECHNICAL DATA: Mixing ratio: comp. A : comp. B = 4 : 1. Pot life of…
MALECH
MALECH
Water-based acrylic undercoat and bonding promoter with a smooth finish. TECHNICAL DATA: Consistency: fluid liquid. Colour: transparent.…
MAPECOAT E23
MAPECOAT E23
Two-component epoxy primer for the protection of concrete. To be applied before the polyurethane finishing.
MAPEFER 1K
MAPEFER 1K
One-component, anti-corrosion cementitious mortar for steel reinforcement rods. TECHNICAL DATA: Maximum dimension of aggregate: 0.5 mm.…
MAPEFIX EP 385/585
MAPEFIX EP 385/585
Pure epoxy, resin-based chemical anchor for structural loads. Certified for threaded bar, construction bars, core-drilled holes and C2…
MAPEGROUT EASY FLOW
MAPEGROUT EASY FLOW
One-component, fibre-reinforced, compensated-shrinkage, sulphate-resistant thixotropic mortar, particularly suitable for repairing concrete…
MAPEGROUT EASY FLOW GF
MAPEGROUT EASY FLOW GF
One component, shrinkage-compensated, sulphate-resistant, thixotropic, inorganic fibre-reinforced mortar, for repairing concrete structures…
MAPEGROUT GF BETONCINO B1
MAPEGROUT GF BETONCINO B1
Free-flowing, compensated-shrinkage cementitious mortar reinforced with inorganic fibres for repairing concrete structures where higher…
MAPEGROUT HI-FLOW B2
MAPEGROUT HI-FLOW B2
Shrinkage-compensated free-flowing fibrereinforced cementitious mortar for repairs to concrete structures
MAPEGROUT LM2K
MAPEGROUT LM2K
Two-component, thixotropic, fibre-reinforced, cementitious mortar with a low modulus of elasticity and added organic corrosion inhibitor…
MAPELASTIC GUARD
MAPELASTIC GUARD
Two-component, elastic cementitious mortar for protecting large concrete structures subjected to high stress. TECHNICAL DATA: Mixing ratio:…
PRIMER SN
PRIMER SN
Two-component epoxy primer with fillers. May be coloured with MAPECOLOR PASTE. TECHNICAL DATA: Mixing ratio: component A : component B = 80…
PURTOP 400 M
PURTOP 400 M
Two-component, solvent-free, spray applied, hybrid polyurea membrane applied in sito using a high-pressure, bi-mixer type pump to form…
PURTOP PRIMER BLACK
PURTOP PRIMER BLACK
One-component solvent primer, specific for improving adhesion of asphalt flooring on surfaces waterproofed with products from the PURTOP…
Realtà Mapei Tags: #iconic #infrastructures

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