Technical Data Sheet
Broadway White Paving Limestone
Broadway Quarry, Broadway, Worcester
Contact : Stanley’s Quarry
Tel. 01386 841 236 Fax. 01386 841 845
email: [email protected]
website : www.stanleysquarry.freeserve.co.uk
Grid Reference: — — —
Compiled September 1999
This data sheet was compiled by the Building Research Establishment (BRE). Where possible, data collected in earlier surveys has been used to help interpret the test results. The data sheet was originally compiled in September 1999 using the results of tests carried out to the proposed European Standards. The work was carried out by BRE as part of a Partners in Technology Programme funded by the Department of the Environment, Transport and the Regions and Smith & Sons (Bletchington) Ltd. The quarry is now owned by Stanley’s Quarry and does not represent an endorsement of the stone by BRE.
The quarry is located on the A44 at the top of Broadway Hill, 1 mile south east of Broadway. The quarry has been in production for more than 40 years. The stone occurs in distinctive colours, known as light and dark cream, and as white paving stone. Available reserves are in excess of 200,000m3. The maximum blocks size at the quarry is 2500mm x 2000mm by 1800mm height on bed with the largest sawn slab size as 2000mm x 2000mm x 900mm height on bed.
The stone is an oolithic limestone and the beds are part of the Jurassic Great Oolite Series. It contains fine ooliths and veins that give it the distinctive colour and texture. The stone is composed of 85% calcium carbonate and 15% quartz. The grains are predominately ooliths that contain fossil fragments at their cores. The remaining grains are small angular quartz grains.
The material between the grains is largely a calcite cement (sparite). The irregular crystal boundaries suggest that the sparite represents the recrystallisation of earlier cements. The cement has minor, patchy iron staining which accounts for much of the variation in colour.
Expected Durability and Performance
It is important that the results from the sodium sulphate crystallisation tests are not viewed in isolation. They should be considered with the results from the porosity and water absorption tests and the performance of the stone in existing buildings. Stone from the Cotswold region is traditionally used as building stone in the region and increasingly in many other towns and cities in the UK. The sodium sulphate crystallisation result indicates that the stone will have good resistance to salt damage and that it will perform well in all but the most exposed locations where it may it may require some extra protection or careful design and detailing to shed water. This stone is denser than the other two Broadway stone and it has been used as paving in the past.
Test Results – Broadway White Limestone
(Test methods Note 1 = EN1341, Note 2 = EN 1342, Note 3 = EN 1341 /BRE 141, Note 4 = BRE 141, Note 5 = Based on earlier BRE data)
Tests were carried out at BRE in 2000. N.D. = not determined