Many problems that develop within asphalt pavements can be attributed to the oxidisation of the oils in the asphalt binder and water penetration. Water, through chemical reaction is an asphalt pavement’s greatest enemy, causing the breakdown of the pavement structure. These problems can be greatly reduced with a conscientious and timely programme of carefully selected surface treatments and preservation can assist in this area.
RHiNOPHALT® penetrates into the top few millimetres of the existing surface course and seals in essential oils and resins, whilst at the same time improving the binding and waterproofing properties of the existing surface. As a result, the treated surface will become more resistant to abrasion, stone loss, water ingress and the severe ageing effects of extreme temperatures.
RHiNOPHALT® penetrates into the surface to provide a protective seal which, sits at the top few mm of the asphalt surface, forming a weather resistant membrane. This stops the escape of lighter bitumen components and seals against water ingress. This seal makes it more resistant to wear than new bitumen, arresting any further deterioration of the road surface. It also improves retention of aggregate and waterproofs by reducing permeability of the surface course.
An asphalt surface will continuously degrade from the day it is installed. RHiNOPHALT® seals the surface and protects the existing bitumen from the impact of oxidization due to weathering and UV degradation. By minimising the occurrence of cracking, crazing and potholes, RHiNOPHALT® dramatically reduces the need for reactive maintenance and has been demonstrated to provide significant life extension to the surface course, thereby delaying the need for resurfacing or other remedial treatments.
Surface deterioration leads to cracking, stone loss and potholes. Any loose aggregate particles pose a significant Foreign Object Debris (FOD) risk to aircraft.RHiNOPHALT® seals the surface, locking the aggregate matrix together and improving the waterproofing. Preserving the asphalt surface with RHiNOPHALT® works, as adoption continues to grow in the coming years it will become an essential tool in highway and airfield asset management.
RHiNOPHALT® can be applied at night which works well with current maintenance programming, and the quick curing time means that the white lines and other markings can be applied in the same closure window.
Application is by a tanker in a single pass operation, treating up to 20,000 - 30,000m2 in a single shift. Surface texture is maintained and grip is restored by fine grit/dust application or sweeping.
Treating new asphalt surfaces will preserve the bituminous binder properties for much longer, delaying the next maintenance intervention. Surfaces considered to be at ‘end of life’ can also be treated, provided they are in sound condition, to arrest the onset of ravelling due to embrittlement of the binder.
The SMA exhibited more consistent recovered penetration values throughout the full depth of the surface course, typical for aged hardened 40/60 penetration grade bitumen in service for 10 years under UK conditions. The treated sections are showing sustained and better rheological properties than the sections which were not treated.
Surface texture on the Untreated (Control) section was recorded at 2.6mm and the Treated section was 1.9mm.
This increase in texture is due to the surface aggregate loss occurring in the material.
The aggregate retention under stress loading can be measured using the TRL Scuffing Test.
The Scuffing Test was originally developed to measure the effectiveness of High Friction Surfacing, but it is also a good measure of surface durability when assessing ravelling under severe traffic conditions. Cores extracted have been assessed through the Scuffing Test process as outlined in the Transport Research Laboratory (TRL) Report 176 Appendix G, results are illustrated below:
The percentage values are based on a sample weight of around 3kg, although the test is only applied to the surfacing.
Even though the loss percentage figure is low, it is the loss of aggregate particles from the surface based on the whole mass of a 3kg core.
1 application can extend remaining asphalt surface life by up to 50% re-application can reduce the number of mill and pave operations during the pavement life.
It is possible to achieve up to a 30% reduction in maintenance costs, and a 40% reduction in unplanned interventions. Independent evaluation has demonstrated a reduction of over 94% in the carbon footprint, when comparing the use of RHiNOPHALT® with conventional maintenance methods.
Having experienced the on-going positive effects of the preservative usage on the M40, when it came to considering the maintenance solutions for the A4048 Sirhowy Enterprise Way, Rhinophalt was an obvious option.
We treated 55,000m2 of thin surfacing course on the Sirhowy Enterprise Way in July 2013 under night-time closure. At the time of treatment the surfacing was nearly eight years old, showing signs of being very open textured in areas and looking brittle. Pre-application rheological binder testing was carried out to ensure the surfacing was in sufficiently acceptable condition for the preservation treatment to proceed. Some areas of chip loss had occurred and patching and joint sealing was carried out prior to and during the preservation treatment.
General Manager, John Laing Roads Team
You can see the benefits of extending the life by one, two, three years. You’re pushing that massive spend further and further into the future.
Airports Director, Dyer & Butler, commenting on the trial at Heathrow Airport
Since RHiNOPHALT® has been applied to the airfield, stone loss has been reduced to virtually nothing.
Based on the results, we would highly recommend the use of RHiNOPHALT® to preserve and extend the life of asphalt surfaces.
Airfield Operations Manager, commenting on the Manston Airport preservation
RHiNOPHALT®, without question, has arrested the surface deterioration and has been a total success.
Senior Engineer, Airbus, commenting on the Hawarden Aerodrome preservation
We’ve been working with Allied using RHiNOPHALT® material... it’s a great innovative product that allows the asphalt surface to be preserved, without having to take it out of service for the kind of time that you would with a traditional resurfacing operation.
Head of Aerodrome Operations, Birmingham Airport, commenting on the trial at Birmingham Airport
In addition to the financial advantages, there have been notable benefits to motorway users, who have experienced significantly less disruption than would have been forecasted originally.
General Manager of UK Highways Ltd, commenting on the M40 preservation
UK Highways is satisfied that RHiNOPHALT® has delivered on its performance claims for significantly reduced maintenance and repair costs and has delivered improved network availability and resilience. As a result, we anticipate substantial lifecycle cost savings over the course of the remaining period of our concession, which runs to 2026.
General Manager of UK Highways Ltd, commenting on the M40 preservation
I was impressed with the speed at which the process can be undertaken. This helps significantly in terms of reducing traffic management costs and minimising delay to the travelling public. In terms of the treatment, it has been very successful and overall the surface has not changed appearance at either site since the date of installation.
Network Construction Manager, Area 1, A30 Crowlas site, EM Highways
I cannot see how anyone can ignore the possibilities available through the use of this process. We believe that preservatives are a big part of the future for highway maintenance and we are pleased to be at the forefront of this innovation. Performance and technical analysis has demonstrated significant success and UK Highways is now looking to repeat treatment to all areas.
General Manager of UK Highways Ltd commenting on the M40 preservation