ROAD PAVEMENTS PRESERVATION CHOICE AND OVERVIEW OF MAINTENANCE TECHNIQUES

Damian LEWANDOWSKI COLAS POLSKA

Sustainable pavements in Europe  Goods transport : 45.9% (sea 36.6%, rail 10.8%)  Goods transport inland: 72.5% (rail 17.1%)  Passengers transport: 83.2% (air 8.6%, rail 7.6%)  The European road network: 6.1 million km (5.5 for the EU 27)

The European context  A high contribution to the European economy  A predominant asset that needs to be maintained and expanded  W: maintenance E: construction & maintenance  Public budgets hit by the crisis  Environmental restrictions / opportunities

environmentally sustainable Environmental issues are becoming increasingly hard to ignore these days. For many companies, it has become a licence to operate. Those who don’t consider the environmental impact of their operations will find themselves at a disadvantage, not just because their competitors are doing it, but also because the public demands it.

New Challenge : environmentally sustainable  Saving materials  Recycling

 Recycling:  Recycling of reclaimed materials  Use of RAP in asphalt plants  In place recycling

 Saving energy  Temperature reduction: from hot to warm and cold options  Transport optimization (recycling)

Warm Mix Asphalt Lowers our carbon footprint

environmentally sustainable From hot to warm and cold options

Without maintenance, roads are condemned Maintenance works can be optimized by using bituminous emulsions For any type of traffic and under all the climates

Road preservation policy Level of service parameters :  Geometrical characteristics of the road  Road usability in all season  Condition of pavement surface, evenness, skid resistance...  Safety

Preservation strategies  User who want to drive in good conditions of safety,  Public and private economic interests bound to transportation of goods and passengers,  Technical feasibility, available materials,  Support of authorities through innovation incentives,  Impact on energy consumption and employment.

Preventive maintenance is crucial

 Act in due time, even if the pavement is still looking in good condition…

Evaluation, auditing are crucial too for the client to know the road network status

Performance monitoring

Choice of the techniques for roads preservation  Great flexibility of use,  Reduction of transportation of materials,  Working season increases,  Energy consumption is lower,  A large range of major cold techniques,  Right product at the right place at the right time.

PANORAMA OF THE COLD TECHNIQUES FOR PRESERVATION

Main objectives of maintenance :  To do patchworks to repair potholes  To rectify of the evenness of a road  To avoid damages connected to the coming up of cracks  To restore skid value and impermeability of the wearing course  To provide safety and comfort

From doing patchworks on potholes to overlays

THE COLD MIXES Layer can be applied to very variable thicknesses (from 3 to 22 cm). Permanent drainability features A strong superficial and internal cohesion, A good impermeability and a good resistance on creep.

Dense cold mixes

COMPOMAC

®

Partial repairs

COMPOMAC ®

To rectify evenness of a road surface

EMULSION GRAVEL MIXES For base courses, Produced in cold plants, Less energy consumption, Reduction of transport of materials, Storable and use all over year, Placed either with a grader or finisher.

The emulsion gravel mixes FLEXIGRAVE ®

COLGRAVE ®

To restore roughness or impermeability SURFACE DRESSINGS, MICROSURFACINGS AND THIN LIFT  Best ratio quality/cost,  For localised applications as well as large surfaces,  It exists different types of surface,  Numerous evolution and perfection were brought to the technique. Modified emulsions as well as emulsions with controlled break.  Adding fibres in surface dressings .

Surface dressings

Surface dressings

NEOLASTIC

®

Special surface dressing with fibres

FIBREDEC

To restore roughness or impermeability

THE MICROSURFACINGS Fabricated and applied by a unique machine, The thickness of application from 8 to 15 mm, Re-opening to traffic within 30 minutes.

Microsurfacings

COLMAT ®

To avoid damages bound to the appearance of cracks

COLD IN PLACE RECYCLING Reusing the materials of the road, Preliminary Laboratory studies to confirm the technique, Geometrical correction of the road, Re-bonding of stripped interfaces.

Recycling

NOVACOL®

To provide safety and comfort

thin and ultra thin layers and other maintenance techniques using bituminous emulsions Emulsions also belong to HMA in construction or rehabilitation. They are essential and primordial for bonding.

Ultra-thin wearing course  Highly gap-graded mix,  A modified bitumen emulsion,  A specific machine,  The thickness of 1 to 2 cm,  The dimension of the biggest aggregates,  Impermeability, adhesion and bonding  Evenness and comfort.

Ultra-thin wearing course

NOVACHIP

®

Very thin wearing course A thickness from 2 to 3 cm, Modified bitumen or special additives, A greater longevity, Tack coat : modified bitumen emulsion, Heavy trafficked road

Very thin wearing course

COLRUG MEDIFLEX ®

Porous asphalt and sound reduction wearing courses Safety and comfort, Reducing water splash and noise, Thickness from 2 to 4 cm, Tack coat : modified bitumen emulsion, Surface drainability.

Porous asphalt DRAINOLASTIC ®

COLDRAINE ®

Sound reduction wearing courses MICROVILLE ®

COLSOFT ®

Overview of compared performances of different maintenance techniques Techniques

Criteria

Conditions of use

Intrinsic characteristics

Surface Dressings SD (1)

Micro Surfacing MS

Ultra-thin Friction Course

1

2

N°

Very Thin Wearing Course

Porous Asphalt (PA)

Thin Wearing Course

Semi-Coarse Asphalt Concrete (SCAC)

3

4

5

6

7

8

2à3

4

4

5à7

Thickness in cm

1 à 1,5

1 à 1,5

1,5 à 2

0 à +2 cm according to removal & deposit

Type of traffic flow