Lincolnshire Limestone

Ancaster Hard White

Petrography Description (EN 12407:2001)

Ancaster Stone is an oolitic limestone from the Lincolnshire Limestone formation of middle Jurassic age. Traditionally, three beds of stone have been worked from beneath around 8m of overburden - the Weather Bed, Hard White and Freestone. The Freestone was not included in the current project.

The Hard White is a creamy coloured stone of uniform texture with very little shell. The depth of this bed is around 3.0m with individual quarry blocks around 2000mm x 1000mm x 500mm on bed.

Ancaster Hard White

Safety in Use
Slip Resistance (Note 1)	N.D.	Values > 40 are considered safe
Abrasion Resistance(Note 1)	N.D.	Values <23.0 are considered suitable for use in heavily trafficked areas
Strength under load
1) Compression(Note 2)	N.D. MPa	Loaded perpendicular to the bedding plane ambient humidity
2) Bending (Note 1)	N.D. MPa	Loaded perpendicular to the bedding plane ambient humidity
	N.D. MPa	Loaded parallel to the bedding plane ambient humidity
Porosity and Water Absorption
1) Porosity (Note 3)	14.0%
2) Saturation Coefficient (Note 3)	0.94
3) Water Absorption	N.D. % (by wt)
4) Bulk specific gravity	2200kg/m3
Resistance to Frost
Freeze/Thaw Test (Note 1)	N.D.
Resistance to Salt
Sodium Sulphate Crystallisation Test (Note 3)	100% Mean wt loss

(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 1997. N.D. = not determined

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