Micro-surfacing is a polymer modified, asphalt emulsion based, dense graded, cold mixed, quick setting, asphalt resurfacing material.
It is designed to be applied in a semi-liquid condition with a specialised mixing and paving machine. By design it chemically changes from a semi-liquid material to a dense cold mix material that is able to carry normal traffic within one hour after application. Micro Surfacing effectively seals, levels, rejuvenates, and aids in skid resistance on existing paved surfaces. The product is now wide known as 'Micro-Asphalt'.
What is the process?
The process uses Micro-asphalt that is applied cold, in fluid form directly onto the existing road, in two 8mm thick layers, that seal the surface to prevent water penetration, restore texture and improve skid resistance. The first layer is rolled in order to achieve a compact surface on which to lay the top layer. The top layer is not rolled as we want the stones to remain proud of the bitumen whilst it cures to give texture to the new surface; this influences skid resistance and durability. The action of a roller would push the stones deep into the bitumen, which is why we rely on the movement of vehicles, which are much lighter, to aid the embedment of the stones.
The finished surface will look quite coarse, uneven and rough immediately after laying, but will improve during the first four - six weeks of use by traffic, as the material beds in. Pictures below show how the material looks immediately after laying, and a few weeks later. The laying process may result in the fluid splashing slightly up the kerb face; this is normal and will weather with time.
Generally within seven days of completing the works the road markings will be reinstated and within three weeks the ironworks (road drain covers, manhole covers etc.) will be adjusted to suit the new surface. British Telecom (BT) covers are excluded from our works, as these are normally raised by BT themselves, but this may not be carried out until a few weeks after the completion of our works.
What are the benefits?
- Is quick to apply, reducing traffic disruption
- Is a cost effective way of prolonging life expectancy of the road
- Protects the pavement structure from moisture and further deterioration
- Has a low carbon footprint