Lincolnshire Limestone

Ancaster Weatherbed Blue/Brown Limestone

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 5-10m of overburden - the Weather Bed, Hard White and Freestone. The Freestone was not included in the current project.

The Weatherbed is a warm-brown coloured shelly stone. The depth of this bed is around 2m with individual quarry blocks around 2000mm x 1200mm x 600mm on bed. The stone from the bottom of the bed can be very shelly and takes an excellent polish.

Ancaster Weatherbed

Safety in Use
Slip Resistance (Note 1)	23-52	(Depending on the colour and finish) Values > 40 are considered safe
Abrasion Resistance(Note 1)	24.2 - 25.6	Values <23.0 are considered suitable for use in heavily trafficked areas
Strength under load
1) Compression(Note 2)	65.6 MPa	Loaded perpendicular to the bedding plane ambient humidity
2) Bending (Note 1)	9.5MPa	Loaded perpendicular to the bedding plane ambient humidity
	5.0 MPa	Loaded parallel to the bedding plane ambient humidity
Porosity and Water Absorption
1) Porosity (Note 3)	10.0%
2) Saturation Coefficient (Note 3)	0.84
3) Water Absorption	N.D. % (by wt)
4) Bulk specific gravity	N.D.g/m3
Resistance to Frost
Freeze/Thaw Test (Note 1)	N.D.
Resistance to Salt
Sodium Sulphate Crystallisation Test (Note 3)	20.90% 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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