Bond Coating & Vertical Joint Sealing
Surface Preparation
Over the past 10 years, improvements in health, safety and quality standards across the industry have increased demand for machine-applied combination bond coating and vertical jointing operations.
In particular, the requirements of ISO BS 594987:2015 + A1:2017 has placed an increased responsibility on the surfacing contractor to machine-apply polymer modified bond coats to the specified rates of spread.
We operate a range of emulsion tankers, from 12,000-litre carriageway sprayers to 200-litre footway sprayers, capable of spraying widths ranging from 0.20m to 4.50m wide, and at the specified rates of spread.
As well as applying bond coats, our combination sprayers apply a hot 50-pen polymer modified bitumen directly against the vertical face of surface courses and/or binder courses.
This approach provides a safer alternative to the more traditional hand application of hot bitumen as well as ensuring an even and thorough distribution of binder along the joint.
It is also possible to over-band and spray the free-edge of verge-side carriageways to seal and protect.
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By using polymer modified bitumen emulsions at binder course and surface course levels, designers have improved the bonding and tensile strength of these layers, leading to improved durability, performance, and longevity of the pavement.
Benefits include:
- Prevention of cracks and other defects
- Prevention of water ingress to the pavement
- Extra protection for the surface course of carriageways and footways
- Machine application limits ‘operatives on the ground’, so reduced people / plant interface risk
By effectively sealing the vertical joints in highway construction and maintenance, water ingress is prevented and therefore, the deterioration of the pavement surface. Vertical joint sealing can be applied on asphalt to asphalt, asphalt to concrete and asphalt to steel joints, to prevent further deterioration by not only sealing out water but also elements such as chemical pollutants and other contaminants.
Reduced
health and safety risk by removing the need for operatives to hand apply hot bitumen
Improved
performance of the surface course, helping it to last longer without any defects
Assured
full binder coverage and correct rate of spread along the full length of the joint
Prevention
of water ingress to the pavement
