In 1984 fifteen trial sections of porous asphalt spray-reducing surfacings were laid on A38 Burton bypass dual carriageway. Seventeen sections of porous asphalt and rolled asphalts were laid in 1987 at the same site. The materials laid included conventional bitumens and proprietary and non-proprietary modified binders and additives. The laying of the 1987 trial sections is described and the results from both trials up to 1990 are presented and discussed. Regular measurements of resistance to skidding, surface texture, deformation, hydraulic conductivity and spray suppression together with visual assessments have been made and comparative performance ratings have been derived. Analytical techniques are derived for estimating spray suppression and spray-reducing life from surface characteristics. (A)
Abstract