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A water truck treating an outback construction haul road

01 RDC · Road Dust Control

Lessdust.Betterroads.

RDC delivers effective dust suppression while helping maintain a tighter, more stable road surface. Reduce water cart reliance, retain pavement fines and lower ongoing road maintenance costs.

Explore Road Dust Control

Where science
meets the earth.

Gravel Lock CSC and RDC IBC totes either side of a PHF pot hole mix pail

Established technology. Decades of industry experience. Practical solutions.

Gravel Lock began in New Zealand, where founder Grant Lewis spent over 15 years developing and testing alternatives to traditional road construction, dust suppression and maintenance methods.

James Davies brought that technology to Australia, combining it with nearly 40 years across road construction, quarrying, materials development and site operations.

Our approach is simple — understand the problem, apply the right solution and deliver practical, cost-effective results.

2 million+
Litres supplied across Australia
1 million m²
Treated area
15
Countries installed
15+
Years of product development

Supplying WA, SA, VIC and QLD, with sales teams and distributors in New Zealand, Australia, Indonesia, Germany, Dubai and the Pacific Islands.

Meet the people behind Gravel Lock

Three products. Built for real‑world conditions.

Specialist solutions for dust suppression, erosion control and pavement repairs, designed to address the challenges of working roads, exposed ground and demanding site conditions.

01 / 03 RDC Road Dust Control Creating hygroscopic pavements

Dust Suppression

A water tanker spraying a sunlit quarry road

Control dust. Retain moisture. Protect your pavement.

RDC is a specially formulated dust suppression and pavement maintenance treatment designed for longer-lasting dust control on unsealed roads and working areas.

Its moisture-retaining properties penetrate the pavement, helping bind fine materials, reduce airborne dust and minimise water cart requirements.

By maintaining a tighter, more stable surface, RDC can also reduce corrugations, material loss and grading frequency, making it ideal for mine and quarry haul roads, rural roads and industrial hardstands.

Standard rate
2 L/m²
Rejuvenation
1 L/m²
Applied with
Water cart or tractor spray
  • Mine haul roads
  • Quarries
  • Gravel rural roads
  • Forestry roads
  • Hardstand yards
  • Construction sites
  • Moisture retention
  • Dust suppression
  • Retaining pavement fines
  • Reduced road maintenance
  • Application using existing equipment
  • Ongoing treatment and maintenance
Enquire about RDC

RDC

More than dust suppression. Protecting the pavement from within.

Gravel Lock RDC is a specially formulated treatment that penetrates unsealed pavement, attracting and retaining moisture rather than forming a surface coating.

By keeping fine materials bound within the road structure, RDC helps reduce dust, surface deterioration and pavement material loss.

Applied to existing roads or during construction, RDC improves dust control, reduces water cart requirements and helps maintain a tighter, more stable running surface with lower ongoing maintenance costs.

Technical documents

A water tanker spraying RDC along a winding bush road

RDC · Road Dust Control

What RDC does to an unsealed road.

  • Moisture retention

    Attracts moisture from the atmosphere and retains it within the pavement, reducing the need for frequent watering.

  • Dust suppression

    Keeps fine particles from becoming airborne under traffic, improving visibility and reducing dust from vehicles and equipment.

  • Retaining pavement fines

    Helps bind fine materials within the road surface, maintaining cohesion and reducing material loss through dust.

  • Reduced road maintenance

    Maintains a tighter road surface, helping reduce corrugations, surface deterioration and the need for frequent grading.

  • Application using existing equipment

    Applied using conventional water carts or spray equipment, with treatment rates tailored to site and traffic conditions.

  • Ongoing treatment and maintenance

    Supports planned maintenance programs through initial treatment and lighter follow-up applications to maintain performance.

02 / 03 CSC Co-Polymer Soil Cement Creating super thin protective skins

Erosion Control

A Gravel Lock water truck spraying CSC onto a quarry batter, the white protective layer forming on the slope

Protect exposed surfaces from wind and water erosion.

CSC is a concentrated liquid polymer that binds loose material to form a durable protective layer over exposed ground.

Diluted with water and sprayed onto surfaces, CSC helps control windblown dust, limit water penetration and reduce erosion caused by rainfall.

Suitable for stockpiles, batters, embankments and disturbed areas, CSC provides temporary or longer-term protection across a range of soil and aggregate surfaces. It can also be used in hydroseeding to support moisture retention and vegetation establishment.

Dust and light erosion
100 mL/m²
Banks and heavy erosion
200 mL/m²
Applied with
Hydroseeder or flow pump
  • Stockpiles
  • Batters and embankments
  • Overburden
  • Disturbed ground
  • Hydroseeding
  • Land rehabilitation
  • Surface binding and protection
  • Windblown dust control
  • Water penetration and erosion control
  • Weather and UV resistance
  • Hydroseeding and revegetation
  • Practical application across different sites
Enquire about CSC

CSC

Bind loose material. Protect exposed ground.

Exposed soils, stockpiles and disturbed ground are vulnerable to wind and rainfall, causing dust, erosion and material loss.

CSC is a liquid polymer treatment diluted with water that penetrates the surface, binding loose particles to form a durable, flexible protective layer.

Once cured, this layer helps reduce windblown dust, water penetration and surface erosion while allowing limited pedestrian and light vehicle access, protecting exposed ground and reducing ongoing maintenance.

Technical documents

A spray truck stabilising a quarry slope with CSC

CSC · Co-Polymer Soil Cement

How CSC works, and why it matters.

  • Surface binding and protection

    Penetrates and binds loose soil and aggregate, forming a durable, flexible crust that protects exposed surfaces.

  • Windblown dust control

    Prevents fine particles becoming airborne, reducing dust on stockpiles, overburden and exposed ground.

  • Water penetration and erosion control

    Forms a water-resistant layer that limits rainfall penetration and helps prevent surface material washing away.

  • Weather and UV resistance

    Designed to withstand sunlight, wind and rainfall, with performance dependent on site conditions and application rates.

  • Hydroseeding and revegetation

    Helps retain moisture and protect seeded surfaces from erosion, supporting vegetation establishment.

  • Practical application across different sites

    Applied using spray equipment to stockpiles, batters and exposed ground. Once cured, tolerates foot traffic and occasional light vehicles, but not heavy traffic.

03 / 03 PHF Coldmix Pothole Fill Permanent pothole repair

Pothole Repair

A pothole repair in progress on a sealed road

Durable repairs. Proven performance. Built to last.

PHF is a high-performance, polymer-modified coldmix asphalt designed for strong, long-lasting repairs to potholes, edge breaks and damaged pavement surfaces.

Its advanced formulation delivers excellent adhesion, flexibility and resistance to traffic wear, even in demanding conditions.

Easy to apply without heating, PHF can be opened to traffic after correct placement and compaction, minimising disruption and repeat repairs. Ideal for councils, road contractors, utilities and industrial applications.

Curing time
Zero
Working range
-5°C to +50°C
Shelf life
9 to 12 months sealed
  • Potholes and edge breaks
  • Utility reinstatements
  • Speed humps
  • Council roads
  • Wet-weather repairs
  • Quarry own-brand coldmix
Enquire about PHF

PHF

Durable repairs. Simple application. Long-term performance.

PHF is a high-performance, polymer-modified coldmix asphalt designed for durable, long-lasting repairs to potholes, edge breaks and damaged pavement surfaces.

Its specially formulated binder provides strength and flexibility to withstand heavy traffic and changing weather conditions.

Requiring no heating, PHF can be applied in temperatures from −5°C to +50°C and reopened to traffic after correct placement and compaction. With no VOCs and continued consolidation under traffic, PHF helps reduce repeat repairs, disruption and ongoing maintenance costs.

Technical documents

A pothole repair under way on a wet road

Simple 3-step application

Designed for the repair, not just the application.

PHF combines easy coldmix application with a high-performance polymer-modified binder.

Conventional compaction establishes a stable repair, while ongoing traffic further consolidates the material for a tighter, more durable surface.

More than filling potholes, PHF delivers lasting pavement repairs that continue performing long after application.

  1. Road worker brooming debris and water out of a pothole
  2. PHF Coldmix being poured from a shovel into the prepared repair
  3. Worker compacting the finished repair with a plate compactor
  1. 1 PrepareRemove loose material and debris, and prepare the damaged area for a sound repair.
  2. 2 PlacePlace PHF into the prepared area and spread evenly to the required level.
  3. 3 CompactCompact using conventional equipment before reopening to traffic. Passing vehicles provide further consolidation over time.

Repairs up to 50 mm deep go in one layer. Deeper holes are filled and compacted in layers, finishing 10 to 20 mm above the surrounding surface.

PHF · Coldmix Pothole Fill

What PHF Coldmix does to a failed surface.

  • Adhesion and cohesion

    Strong adhesion. A repair that holds together.

    Polymer-modified binder holds aggregate together, resisting material displacement, surface deterioration and repeated traffic loading.

  • Compaction and strength development

    Properly compacted. Further consolidated by traffic.

    Conventional compaction creates a stable repair, with ongoing traffic further consolidating the surface while maintaining flexibility.

  • Temperature range

    Ready for repairs from −5°C to +50°C.

    Suitable for application in hot and cold conditions without the need for heating.

  • No VOCs

    No volatile organic compounds.

    Contains no VOCs, avoiding solvent emissions associated with some conventional coldmix products.

  • Application and return to service

    Conventional placement. Minimal disruption.

    Easy to apply using standard equipment, with roads reopened promptly after correct placement and compaction.

  • Long-term performance

    Durable repairs. Less repeat maintenance.

    Strong adhesion and flexibility help resist traffic wear, reducing repeat repairs and ongoing maintenance costs.

PHF Binder

Make your own coldmixwith PHF Binder.

PHF Binder enables quarries, crushing and screening operators and material suppliers to manufacture premium polymer-modified coldmix asphalt using their own aggregate.

Turn your aggregate into a higher-value product.

Expand your product range, create new revenue opportunities and supply councils, civil contractors and road maintenance crews.

Gravel Lock Australia provides guidance on aggregate grading, binder requirements and mixing methods to help maximise yield and achieve a consistent finished product.

Request the free 20 L sample
Gravel Lock crew tipping a bucket of PHF Coldmix into a mixing tub on site

Three key advantages

  • Value-add your aggregate

    Transform existing materials into premium coldmix asphalt, expanding your product range and revenue opportunities.

  • Use your existing equipment

    Simple onsite production using suitable existing equipment, with no specialised blending plant required.

  • 9–12 months storage life

    Produce in batches, store and package for future sale or use, with up to 9–12 months workability under suitable conditions.

Proven where roads work hardest.

From quarry haul roads and mine sites to rural roads and industrial areas, Gravel Lock delivers practical, site-specific solutions through the right products and application methods, proven in demanding Australian conditions.

  • 80%

    Water savings

    Typical reduction in water use with RDC

  • 75%

    Fewer cart passes

    Water cart deployments cut with RDC

  • Up to 20 wks

    Dust suppression

    From one RDC treatment at 2 L/m²

  • 0 hrs

    Curing time

    PHF Coldmix opens to traffic straight away

See our projects

A selection of Gravel Lock applications across quarries, haul roads, council networks and private sites — what was treated, and what it changed.

Full case studies, with rates, materials and site conditions, are available on request.

  • A water tanker discharging on a construction haul road TEL Alliance Project NZ Highway construction · 2014 A 28 km haul road went from four water carts to one, saving $2,500+ a week, with no grading needed for the season RDC
  • A treated gravel road running through gum trees Far North District Council NZ Council roads · 2014 to 2020 Six summers of gravel road dust control across multiple sites in Northland RDC
  • A water tanker spraying a quarry road, the spray coming from beneath the tank Winstone Quarries NZ Quarry 80%+ water savings and $50,000+ saved annually RDC
  • A water tanker on a treated quarry haul road Adelaide Brighton Quarry SA Quarry Five days of dust control between passes RDC
  • A spray bar applying RDC across a sand surface Tara Iti Golf Course NZ Private club · 2017 Dust removed from the cart and internal roads RDC

Results from Gravel Lock field applications. Performance varies with material, traffic and climate.

Built for the people who keep roads running.

  • Water truck spraying a quarry embankment
    01

    Mining and quarries

    Haul roads, stockpiles and overburden held down through the dry season.

  • Freshly treated gravel rural road
    02

    Councils

    Gravel rural roads that stay tight, plus permanent pothole repairs.

  • Water truck smoothing a dusty construction road
    03

    Civil construction

    Dust capping and erosion control on batters and disturbed ground.

  • Australian road worker repairing asphalt
    04

    Road crews and utilities

    Wet-weather reinstatements that carry traffic immediately.

Also proven on

  • Forestry haul roads
  • Hardstand yards and truck parks
  • Runways and helipads
  • Carparks
  • Rural and station roads
  • Golf courses and resorts

From first call to first pass.

From understanding your site requirements to getting the product on the ground, we help make the process straightforward.

Road construction crew on a resurfacing job
  1. 01

    Consultation

    We take the time to understand your site conditions, operational challenges and what you're looking to achieve. From there, we recommend the right product, treatment approach and application requirements.

  2. 02

    Logistics

    We coordinate product supply and delivery to suit your project requirements, working with transport providers and site teams to have the material available when it's needed.

  3. 03

    Application and implementation

    We provide practical guidance on site preparation, application methods and treatment requirements, working with your team or application contractors to help achieve the best result.

Supplied as

Delivered in the format your site runs on.

Flexible supply options to suit your operations and project needs.

From bulk deliveries to smaller quantities and ready-to-use packaged products, Gravel Lock Australia provides practical supply solutions tailored to your site, equipment and requirements.

  1. RDC dust control IBC tote

    RDC

    Road Dust Control

    1,000 L IBC or bulk tanker

    Ex works Price, South Australia, with depots in WA, SA, VIC and QLD. Static or mobile tanks, pumps and training can come with it.

  2. CSC erosion control IBC tote

    CSC

    Co-Polymer Soil Cement

    Concentrate, ex works VIC or NSW

    Supplied as a concentrate and diluted on site with any potable water source, then sprayed or hydroseeded.

  3. PHF pot hole mix pail

    PHF

    Coldmix Pothole Fill

    20 kg bags, 1 t bulk bags or stockpile

    Ready to use straight from the bag. Delivered by tipper or truck and dog, and stored on site for 9 to 12 months sealed.

Let's lock down your site.

Tell us about your roads, stockpiles or potholes. We'll recommend a product, a rate and a trial plan.

sales@gravellock.com.au
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