Broadcroft Whitbed

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Description

Broadcroft Whitbed is a tightly grained stone with a medium shell content and a small amount of white flex.

It is durable and suitable for all most applications as a general building stone including, paving and copings.

It is easily carved and can be shaped to suit most applications.

We have extensive stocks of this Portland stone with blocks typically from 1 tonne upwards to 15 tonnes.

Petrography

Portland Oolitic Limestone

The stone is an open textured oolitic limestone from the Portlandian formation (Jurassic). Formed from micrite (fine-grained calclium carbonate) ooids with a small quantity of micrite occurring as matrix. The shell fragments are elongated to rounded and are typically about 4mm 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. In some areas ooids are fused or are surrounded by a sparse carbonate matrix.

Durability & Weathering

Portland limestone which has a low saturation coefficient (<0.72), a low microporosity (<11.0 of the stone by volume) and an open oolitic structure generally perofrms well over long periods when used on buildings.

Based on current research it seems likely that the stone would weather at a rate of between 1 and 3 mm per 100 years but it could be greater in severe exposures.

Overall, should be suitable for use in most aspects of construction including flooring, paving, load bearing masonry and cladding including areas where a long service life is needed or where high salt concentrations are expected.

Physical Characteristics

Colour: Buff/White          Texture: Medium to Fine Grained

Sizes Available:-              Maxiumum             Typical Range

Bed Height:      1800mm                 600mm – 1500mm

Length:             4000mm                800mm – 2800mm

Block Size:   8.2 m3                               0.40 m3 – 3.8 m3