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Technical Data Sheet
Dukes Gritstone
Dukes Quarry, Whatstandwell, Derbyshire
Bolehill Quarry, Wingerworth, Derbyshire, S42 6RG
Contact : Blockstone Ltd
Tel: 01246 554440 Fax: 01246 220095
Email: blockstone@realstone.co.uk
Website : http://www.realstone.co.uk/blockstone
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 Blockstone Ltd and does not represent an endorsement of the stone by BRE.

General
The quarry is near the town of Whatstandwell in Derbyshire. The quarry has been producing stone since the early part of the 19th century and it has been used in buildings since at least 1825

Petrography 
Dukes Gritstone is a Millstone Grit of Carboniferous age. It is a medium-grained stone, pink/lilac in colour with iron, black and buff markings. The average block size is 1400mm x 900mm 700mm.

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. Carboniferous Sandstones 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. Dukes Gritstone appears to be a durable stone that is not effected by acid rain or air pollution and like most sandstones it is expected have good frost resistance. The compressive strength of the stone is typical of the range for sandstones and is comparable with the stronger UK limestones.

Overall, Dukes Gritstone should be suitable for use in most aspects of load bearing masonry and cladding.

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

Not determined

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

Not determined

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

74.9 MPa

Loaded perpendicular to the bedding plane ambient humidity
1) Compression(Note 5) 

39 - 50 MPa

Dry. Loaded perpendicular to the bedding 
2) Bending (Note 1) 

8.7 MPa

Loaded perpendicular to the bedding plane ambient humidity 

4.8 MPa

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

14.11%

2) Saturation Coefficient (Note 3) 

0.67

3) Water Absorption

4.18 % (by wt)

4) Bulk specific gravity 

2269kg/m3

Resistance to Frost 
  Freeze/Thaw Test (Note 1) 

Not determined

Resistance to Salt 
Sodium Sulphate Crystallisation Test (Note 3)

3.13% Mean 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, Note 5 = ASTM)

Tests were carried out at BRE in 1997 and supplemented by data provided by the producer.

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