Resin bound driveways
The use of resins and aggregate in the construction of driveways is now widespread and there are two main methods used: resin bonded and resin bound. There are significant differences between the two methods of construction and their properties. Both require the use of resins and aggregate – gravel, or crushed stone and sand – but both require different surfaces prepared for their use and both have different properties in terms of maintenance. A positive factor about aggregate is that it can be composed of re-cycled materials.
Resin bonded surfaces are constructed by covering a suitably-prepared surface with resin. Loose aggregate is then spread across the resin. As the resin dries the aggregate adheres to it firmly. Loose aggregate is removed once the resin has dried and the resulting surface has the same appearance as a driveway of loose aggregate or gravel. The surface on which this method of construction is used however must be non-porous and therefore composed of concrete or asphalt. Because the aggregate is stuck onto such a surface with the resin it remains porous; this means that water build up can take place and it is therefore necessary to ensure that soak-aways and course drains are incorporated in the construction to ensure suitable dispersal of water. Provided this is done maintenance of resin bonded surfaces is not high but over a period of time there may be some loosening of the aggregate with wear.
Resin bound driveways are constructed using the same resins and aggregate as resin bonded but there is a difference in that, instead of being stuck to a resin covered surface, a resin bound surface is formed by mixing the aggregate and resin. This mixture retains flexibility and therefore allows for it to be used on existing hard and even uneven surfaces. Often the mixture will be resistant to the effects of ultra violet light, helping to preserve its appearance. The resin and aggregate mixture is poured over the desired surface; it is then evenly spread by hand using a trowel. The mixture dries very quickly usually in a matter of only a few hours, and is therefore limited in the degree of disruption laying it can cause. Resin bound surfaces remain permeable and this results in water being allowed to drain through it. Another advantage of resin bound over resin bonded is that the surface can be cleaned using a pressure washer without the surface breaking up and the aggregate becoming loose.