About Us
Gravel Lock are dust suppression specialists, supplying high-performance products to the global civil construction market
With over 15 years of development and innovation, Gravel Lock has created advanced solutions for Dust Suppression, Erosion Control and Road Repair.
"Where Science Meets the Earth"
Our Story
Gravel Lock
Innovation on the Road Since 2008
Gravel Lock is a New Zealand company driven by innovation and a determination to solve the hard problems of road construction and maintenance. The story began in 2008 when founder Grant Lewis faced a subdivision with a heavy clay subbase that kept moving and cracking beneath the stabilised surface. Solving that failure set him on a full time path in roading, researching, testing, and creating products that turn real world problems into workable, sustainable solutions.
Milestones that Built a Reputation
From its first breakthrough, Gravel Lock has delivered projects that push the limits of materials science, including
• Urban Surf in Melbourne where 6,000 square metres were stabilised to withstand more than a million waves a year pounding the pavement of a major surf park,
• a German autobahn subbase where 9,950 square metres were treated to a depth of 200 millimetres to combat frost heave under one of the world’s most demanding highways,
• Dubai sand stabilising where 5,000 square metres of road shoulders were strengthened in a region that depends heavily on imported aggregates and where the ability to stabilise in situ granular sand is a major breakthrough,
• and summer season dust programs where hundreds of thousands of litres of RDC Road Dust Control have been applied to unsealed roads, connecting communities with cleaner air, safer travel, and dramatically reduced maintenance.
Products for Today’s Challenges
Our focus is clear: dust suppression, erosion control, hydroseeding polymers, untrafficked dust control, and pothole repair.
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RDC-Road Dust Control is a naturally occurring bischofite brine that draws moisture from the atmosphere to lock fines in place. Under normal conditions roads treated with RDC require no watering for an entire summer dust season, reducing watering, maintenance costs and, aggregate loss.
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PHF-Coldmix Pothole Fill is a polymer modified cold asphalt that adheres to potholes in wet weather, compacts easily and, can be trafficked immediately after placement.
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CSC-Co Polymer Soil Cement is a liquid co polymer used for dust capping, erosion control, and hydroseeding applications.
Each product is supported by proven application methodologies developed through years of field work.
For bulk RDC projects Gravel Lock's spray team and logistics partner, Tranz Port Logistics in Tauranga, handle spraying, transport and delivery of bulk product to deliver consistent results for major civil contractors and councils.
Sustainability and Community Impact
By reducing watering, lowering dust emissions and, extending the life of unsealed roads, Gravel Lock products cut maintenance budgets and improve daily life for the people who rely on those roads. Our formulations are designed to be as environmentally responsible as current chemistry allows, with continual research aimed at safer ingredients and lower carbon footprints.
Global Reach, Local Expertise
Established in New Zealand and expanded to Australia in 2022, Gravel Lock now supplies projects across the Pacific and beyond. Our technical team supports contractors with proven application methods, logistics coordination, and digital tools such as the RDC Field App to track quantities, trucking, and job data in real time.
Always Inventing
Fifteen years on, the spirit that launched Gravel Lock is still alive in the lab. Grant and the team continue to refine existing products and develop new solutions that challenge conventional road construction, because the next big breakthrough is always under way.
Building Safer more durable roads
Our Vision
Our Mission
Gravel Lock develops and supplies advanced roading products that help councils, mines, major contractors and, independent operators maintain safer, longer lasting roads. Our range of products deliver low toxicity, water savings, and reliable performance in demanding conditions.
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Each product comes with a full service package that provides application guidance, on site expertise, logistics coordination, and digital support through the RDC Fast Track App for real time data collection. From planning to completion we work alongside our clients, sharing information and experience to achieve the best outcome for every project.
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Innovation, sustainability, reliability, and partnership guide every decision. We invest in continuous product development and collaborate with our Partners, Toll Manufacturers, Customers and Suppliers across New Zealand, Australia, the Pacific Islands and, emerging markets in Europe. Our team of people take pride in their work, our customers drive our innovation and, our shared commitment to better roads and cleaner environments shapes everything we create.
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Gravel Lock - Innovation Built from the Ground Up