Limestone

Stokeground Basebed Bath Stone

Petrography Description (EN 12407:2001)

Stoke Ground Stone is an oolitic limestone from the Great Oolite of middle Jurassic age. The stone is mined approximately 15m below ground but access is relatively easy. There are two different beds available - the Base Bed and Top Bed.

Stokeground Basebed Bath Stone

Safety in Use
Slip Resistance (Note 1)	80 (Base) 80 (Top)	Values > 40 are considered safe
Abrasion Resistance(Note 1)	28.2 (Base) 34.5 (Top)	Values <23.0 are considered suitable for use in heavily trafficked areas
Strength under load
1) Compression(Note 2)	22.5 MPa (Base) 13.8 MPa (Top)	Loaded perpendicular to the bedding - ambient humidity
2) Bending (Note 1)	5.4 MPa (Base) 3.7 MPa (Top)	Loaded perpendicular to the bedding - ambient humidity
Porosity and Water Absorption
1) Porosity (Note 3)	21.5% 26.9%	(Base) (Top)
2) Saturation Coefficient (Note 3)	0.67 0.82	(Base) (Top)
3) Water Absorption	7.4% 11.6%	(by wt) Base (by wt) Top
4) Bulk specific gravity	2126 kg/m3 1988 kg/m3	Base Top
Resistance to Frost
Freeze/Thaw Test (Note 1)	Not determined
Resistance to Salt
Sodium Sulphate Crystallisation Test (Note 3)	Mean: 28.9% wt loss 55.0% wt loss	(Base) (Top)

(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 in 1996

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