Emulsion gravel or cold-mix asphalt consists of gravel treated with one or more bituminous binder(s).
These mixtures were first created in the early 1900s and were mainly intended for small projects and maintenance. With the passing of time, the production of cold-mix asphalt has evolved. Today, emulsion gravel and cold-mix asphalt are essential alternatives to hot-mix techniques and are continuing to develop in leaps and bounds. As they are economical and efficient, produce low levels of greenhouse gas emissions and provide solutions for the recycling of asphalt aggregates, their use is growing at a spectacular rate.
Despite not being as strong as gravel treated with hydraulic binders, cold-mix asphalt has undeniable assets: self-repairing qualities, ease of storage and flexibility, etc. Cold-mix asphalt is used for road maintenance and new builds, according to the traffic conditions.
The main criteria are the grading curve, structural flexibility, strength and its development over time, the voids index, waterproofing, application and transportability.
Thanks to the constantly improving mechanical performance and growing environmental constraints (reuse of RAP, CO2 emissions, etc.), there have been significant developments in the field of cold-mix asphalt, which is now divided into sub-groups such as dense cold-mix asphalt (for wear courses) and open cold-mix asphalt. Manufacturing techniques have also improved to allow for the production of the most technically sophisticated mixtures. One of the latest developments is double-coating.
Our equipment designed for cold-mix asphalt production:
- road base courses and wear courses