Collen Bros (Quarries) Ltd was contracted to carry
out the Asphalt surfacing on the Craigavon Greenway
project in 2014.
Part of the work required on this project was for
6mm blue SMA. Due to not having completed this type
of work with coloured asphalt before and no manufacturer
in Ireland having ever manufactured blue SMA, Collen
Bros (Quarries) Ltd embarked on a series of tests
to ensure the blue SMA was a success for the project.
Many different binders, dyes and various aggregates
were tested to ensure a light blue colour was achieved,
this was required to help enlighten the dark underpasses
in which it was to be placed and reduce antisocial