+68 PSV Sandstone
+68 PSV sandstone is extracted from our Ballystockart Quarry near Comber. Ballystockart’s High PSV sandstone aggregate is primarily exported to Great Britain for use in production of asphalt surface courses.
+68 PSV Sandstone
Whitemountain produces +68PSV aggregate in accordance with the following BS EN specifications:
BS EN 13043:2002 (Coarse Aggregate for Asphalt and Asphalt Concrete)
BS EN 13043:2002 (Aggregate for Surface Treatment and chippings for rolling into Asphalt)
BS EN 12620:2002+A1:2008 (Aggregates for Concrete)
Specification of Highway works:
SHW Series 500 (Aggregates for Drainage)
SHW Series 600 (Earthworks and Capping)
SHW Series 800 (Unbound mixtures used in sub–base)
Geology and Physical Properties:
The High Polished Stone Value (PSV) Sandstone extracted from Ballystockart Quarry was formed 400 million years ago in the Geological period known as the “Silurian”. Grains of Volcanic, Sedimentary and Metamorphic rocks were eroded by ancient rivers from mountainous areas and deposited into the sea. Depending on the deposition conditions these sedimentary deposits eventually formed the rocks associated with the Silurian period; Greywacke’s, Arenites and Shales. After 400 million years of compaction, heating, cementation, and erosion these rocks are now present in only a few areas of the UK and Ireland. Ballystockart Quarry, is situated in unique geological area known as the “Longford– Down Massif”, this is a relatively small area where the Silurian rocks can be found in Ireland. The Sandstone at Ballystockart Quarry outcrops in Westerly dipping bedding plans, with a distinct pink / red colouration.
Our +68PSV Sandstone reserve is specifically classed as a Litharenite; composed of poorly sorted lithic grains pressed against each other with matrix content less than 15%. The particular relationship between the grain and matrix structure forms a “micro surface texture” on the aggregate which is not easily removed, allowing it to achieve +68PSV quality status. Whitemountain Quarries maintains this +68PSV classification with regular external UKAS accredited testing for both UK market under specification of Highway Works series 900 requirements and (Republic of Ireland) NRA IAN 05/13 requirements. Our +68PSV aggregates are CE marked under BS EN 13043 with an extensive range of physical and chemical tests carried out to provide our customers with the relevant physical technical information.
Ballystockart +68PSV Physical Property Summary (CE Cert GB 12/85538) available on request