Limestone

Perryfield Whitbed Portland Limestone

Petrography Description (EN 12407:2001)

The stone is an open textured oolitic limestone from the Portlandian formation (Jurassic). The stone is formed from micrite (fine grained calcium carbonate) ooids with a small quantity of micrite occurring as matrix. There are numerous shell fragments which are elongated to rounded and are typically about 5 - 10 mm across. The stone generally appears to be moderately compacted although the degree of compaction is variable. Most of the areas exhibit a fairly high intergranular porosity with interlinking of adjacent pores.

Perryfield Whitbed Portland Limestone

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)	36.6 MPa	Loaded perpendicular to the bedding plane ambient humidity
2) Bending (Note 1)	7.3 MPa	Loaded perpendicular to the bedding plane ambient humidity
	N.D.	Loaded parallel to the bedding plane ambient humidity
Porosity and Water Absorption
1) Porosity (Note 3)	15.8%
2) Saturation Coefficient (Note 3)	0.63
3) Water Absorption	4.4 % (by wt)
4) Bulk specific gravity	2279kg/m3
Resistance to Frost
Freeze/Thaw Test (Note 1)	N.D.
Resistance to Salt
Sodium Sulphate Crystallisation Test (Note 3)	11.92% Mean wt loss

(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 1996-97. N.D. = not determined

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