If the following component ‘1’ is met by the investor/Customers and ‘2-5’ are met by the installing contractor, then the final surfacing should provide excellent in-situ performance, for years, and therefore providing you the engineer with a very good value for money investment when analysing its ‘Whole Life Cost.’
1. THE SUBSTRATE ITSELF TO WHICH THE HIGH-FRICTION ANTI-SKID AND COLOURED SURFACING IS BEING APPLIED.
For long term performance and therefore a worthwhile investment, it is critical that the underlying substrate provided by the investor is fit for purpose i.e. it can withstand the increased stress placed on it by the new high-friction surfacing.
Although contractors can provide some advice based on their previous experience of varying substrates it is ultimately the investor’s responsibility to provide a suitable substrate.
Contractors will most likely provide a warranty covering their material’s performance with respect to its adhesion to the substrate (and on-going skid resistance of course), however it is the investor’s responsibility to ensure that delamination of the contractor’s material does not occur due to a cohesive failure within the substrate (most commonly asphalt). This is acknowledged by the New Zealand Transport Agency (See P25 Clause 3.3).
2. THE PREP WORK RELATING TO THE ROAD SURFACE (SUBSTRATE)
All prep work must comply with the specific requirements as stated in the contractors’ Installation Method Statement (approved by the resin binder manufacturer). If the prep work is not conducted in a meticulous and detailed manner, and short cuts are taken, the finished surfacing can and often does fail, even if the materials are of the highest quality.
N.B. Colourgrip Surfacing Ltd. has an Installation Method Statement based on 18 years’ practical experience in every installation situation and surface.
3. THE RESIN BINDER APPLIED TO THE ASPHALT SURFACE (SUBSTRATE)
Should have a proven track record in the roading environment;
Internationally-recognised highways agency body certification (e.g. UK Highways Agency’s ‘British Board of Agrément’ (BBA) for performance as a high friction ‘anti-skid’ surfacing on highly trafficked state highways with a design life of 5-10 years.
N.B. Colourgrip®’s resin binder has BBA Certification since 1999.
Must provide excellent technical properties;
Strength, to support the constant heavy pounding of traffic such as fork hoists and personnel, without wearing down), expressed as Tensile Strength in Newtons per mm³. An acceptable laboratory test result would be at least 13.0 N/mm³.
N.B. Colourgrip®’s resin binder achieves 14.0 N/mm³.
Elasticity, to handle any underlying substrate movement throughout its performance life, expressed as % Elongation At Break. An acceptable laboratory test result would be 45%.
N.B. Colourgrip®’s resin binder achieves 50%.
Guaranteed minimum resin thickness of 1.35kg/m2 This figure has been taken from the original British specification for the minimum specified by the UK Highways Agency for state highways (like our Transit/NZTA here) so they could be sure that the roading contractors were laying a more than acceptable depth of resin for the aggregate to embed well and hold firm. This can be confirmed by sighting the contractor’s Installation Quality Control Form, upon completion.
N.B. Colourgrip Surfacing Ltd. completes an IQC Form after every installation and provides a copy to their Customer for their own records Our spread rates are always higher than the 1.35kg/m2 promised minimum.
4. THE AGGREGATES APPLIED TO THE RESIN BINDER
In order to meet the stringent NZ performance specifications such as the NZ Transport Agency’s P25 Spec. for Calcined Bauxite and the P33 Spec. for Coloured Safety Surfacings, all aggregates proposed by contractors for use on our highway network should be manufactured and processed under a robust compliance mechanism such as ISO9001 to ensure they are calcined (bauxite only), crushed, washed, dried, screened and graded to a very high standard so they consistently pass NZS4407:1991 Test 3.10 for crushing resistance , under a load of 230k/N produces less than 10.0% fines (as specified by the NZ Transport agency for high-friction anti-skid locations on state highways). They should provide a final surfacing which consistently produces an acceptable skid-resistance value (SRV) under SCRIM or British pendulum (BPN), by having good macro and micro texture and a high resistance to polishing. These aggregates should also be within an acceptable grading curve tolerance.
N.B. When applied on roads all Colourgrip®’s aggregates comply with NZS4407:1991 Test 3.10 for crushing resistance.
For artificially colour-coated/pigmented aggregates, to ensure maximum colour-life, these should comply in colour shade with the latest NZ specifications and carry international certification (e.g. BBA) for resistance to UV degradation and therefore colour fade. Additionally, the contractor should ensure the underlying stone of the pigmented aggregate matches as closely as possible the colour of the resin coating to further extend the coloured surfacing’s colour life, once the colour coating has been eroded off the aggregate peaks by the traffic.
N.B. Colourgrip®’s colour-pigmented aggregates hold BBA Certification for UV resistance and colour-life.
Each aggregate consignment should be traceable by batch number and be supported by place of origin test results confirming its chemistry and grading, all under ISO 9001 quality control. Reasonably recent PSV test certificates should also be available from the aggregate manufacturers, upon request.
N.B. Each aggregate consignment imported by Colourgrip Surfacing Ltd. from the U.K. conforms to ISO9001. PSV test certificates are available from our aggregate manufacturers, upon request.
5. THE CONTRACTING EXPERIENCE IN INSTALLATION WORK
Choosing a proven, quality high friction anti-skid and coloured surfacing is a smart decision but worthless without commissioning the services of a highly experienced contracting outfit. There are so many pitfalls and temptations to cut corners so the Engineer’s choice is a really important decision.
Ensure the installing contractor has comprehensive experience laying coloured safety surfacing, successfully, and has the full support of the resin binder manufacturer as an approved installer of their material.
N.B. Colourgrip Surfacing Ltd.’s contracting team has more than 22 combined years’ experience installing resin binder and aggregate anti-skid and coloured surfacing systems internationally and all appropriate substrates.
The Colourgrip® Surfacing System meets, and in many instances well exceeds the above specifications.