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Technical Data Sheet
Birchover Gritstone
Birchover Quarry, near Stanton in Peak, Derbyshire
Bradford Street, Keighley, West Yorks, BD21 3EB
Contact : George Farrar (Quarries) Ltd
Tel: 01535 602344 Fax: 01535 606247
Email: sales@farrar.co.uk
Website : www.farrar.co.uk
Grid reference : ---- ----
Compiled November 1997, updated June 2000

This data sheet was compiled by the Building Research Establishment (BRE)., The data sheet was compiled in November 1997 and updated in June 2000 using BRE test results and data collected in earlier surveys. 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 George Farrar (Quarries) Ltd and does not represent an endorsement of the stone by BRE.

Compiled November 1997

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 compiled in July 1997 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 and Natural Stone Products Ltd and does not represent an endorsement of the stone by BRE.

 

General
The quarry is just to the north of Birchover between Stanton-in-Peak and Birchover village. It has been worked for more than 150 years and has good reserves of stone.

Petrography 
Birchover Gritstone is from the Millstone Grit of Carboniferous age. Stone from the quarry is medium- to coarse-grained and is pink to buff in colour. There is little overburden on top of the 40m face. Large blocks are available and it is generally supplied at depths of 1.5m on bed.

Expected Durability and Performance 
It is important that the results from the individual tests are not viewed in isolation. They should be considered together and compared to the performance of the stone in existing buildings and other uses. Sandstones from the Millstone Grit series are traditionally acknowledged as generally being a very durable building and paving stone and have been used extensively in many towns and cities in the UK. Birchover sandstone appears to be a durable stone that is not effected by acid rain or air pollution. The weight lost in the harsh saturated sodium sulphate crystallisation test indicates limited resistance to salt damage in very severe environments (for example in coastal locations or from de-icing salts); the results suggest that the stone would have good frost resistance. The compressive strength and flexural strength of the stone are typical of the range for sandstone. The abrasion resistance is comparable with York paving stones and should be suitable for use in heavily trafficked areas.

Overall, should be suitable for use in most aspects of construction including flooring, paving, load bearing masonry and cladding.

Test Results - Birchover Gritstone
Safety in Use 
Slip Resistance (Note 1) 

wet: 75

 Values > 40 are considered safe. 
Abrasion Resistance (Note 1)

22.1

Values <23.0 are considered suitable for use in heavily trafficked areas
Strength under load 
1) Compression(Note 2) 

73.6 MPa

Loaded perpendicular to the bedding plane ambient humidity
2) Bending (Note 1) 

8.9 MPa

Loaded perpendicular to the bedding plane ambient humidity 
Porosity and Water Absorption 
1) Porosity (Note 3) 

13.1 - 15.3%

2) Saturation Coefficient (Note 3) 

0.63 - 0.65

3) Water Absorption
(at atmospheric pressure)

3.6 % (by wt)

4) Bulk specific gravity 

2296kg/m3

Resistance to Frost 
  Freeze/Thaw Test (Note 1) 

Not Determined

Resistance to Salt 
Sodium Sulphate Crystallisation Test (Note 14) (saturated )

Mean: 100% (cubes failed) (wt loss)

Resistance to Acidity 
Acid Immersion Test(Note 4)  

Pass 

All samples passed the test with no splitting or delamination

(Test methods Note 1 = prEN1341, Note 2 = prEN 1342, Note 3 = prEN 1341 /BRE 141, Note 4 = BRE 141)

Tests were carried out at BRE between July and September 1996, additional data from 1986 also included)

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