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Portland Stone - Paving - Natural Limestone Paving

Verified by manufacturer 4 months ago

Ostrea Patch Reef Whitbed

Albion Stone plc Variant:

Portland stone for external paving.

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Application

Suitable for external paving applications.

Description

Portland Stone is extracted from one of the largest mines on Portland, and although there is no colour variation in the basic matrix of the stone, the shell content and texture of each bed will reflect the light differently, creating the eight variations of the stone.


Bowers Roach:

Contains large grey shell fragments that include Turreted Gastropods (Portland screws), as well as large clam shells. It has a large number of holes scattered throughout due to the removal of fossil shells by percolating rain.


Grove Whitbed:

Predominantly grey shells with some large white shell fragments, mainly large thin clams up to 100 mm long laid parallel to the bedding. Some banding is evident in larger slabs.


Fancy Beach Whitbed:

A moderately high shell content, which are predominantly grey. There are small voids throughout the slab and the texture varies.


Heritage Portland Stone:

The shells are randomly distributed across the stone, with some areas of low shell content and some areas of high shell content. Varied texture is evident across the slab.


Jordans Whitbed:

A medium shell content, mainly large, thin clams up to 80 mm long laid parallel to the bedding. The stone mellows over time to grey/ white due to grey and white fragments.


Ostrea Patch Reef Whitbed:

The shells are randomly distributed throughout the stone, including many large grey and white oyster shell fragments. It is typically coarse with some vuggy patches.


Stonehills Whitbed:

The stone has a low to medium shell content that are predominantly grey with some white fragments that are randomly distributed across the stone. Banding is evident, particularly in larger slabs.


Features and benefits:

  • Creamy/ white in colour.
  • Uses the UK's most environmentally friendly techniques.
  • From the Jordans/ Bowers mine and Stonehills mine on the Isle of Portland.
  • Regularly assessed and accredited by the completely independent British Standards Institute.
  • CE marked.

General information

Color

Cream

White

Grey

Manufacturer guidance

Creamy/ white is typical Portland colour with grey shell included.

Finish

Honed

Material

Limestone

Shape

Other

Formless

Circle

Oval

Triangle

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Length

Bespoke

Width

Bespoke

Height

Bespoke

Uniclass

Pr_25_93_60_58 Natural stone paving slabsPrimary

CAWS

Q25/50 Natural stone slabs

Q25/115 Natural stone slab paving overlay system

Q25/110 Natural stone slab paving system

Q25/26 Natural stone slab paving systems

M40/10 Natural stone covering

M40/115 Natural stone covering

Specification data - Natural stone paving slabs

Stone denomination

-

Petrological family

Limestone.

Guidance for specification option:

Fine-grained sedimentary limestone.

Colour

Creamy white.

Manufacturer guidance

Creamy/ white is typical Portland colour. The content of grey shell can vary the overall colour depending on the density of included shell.

Name (traditional)

Portland stone.

Origin

Jordans/ Bowers mine, Isle of Portland, UK.

Performance requirements

-

Slip resistance

PTV 76 (wet); 24 (dry).

Guidance for specification option:

  • Wet lowest expected value 66, highest expected value 87.
  • Dry lowest expected value 76, highest expected value 101.

Manufacturer guidance

TRRL pendulum test: grit 120 (flooring). Average values.

Breaking load

To BS EN 13364, 4667 N (75 mm); 1860 N (50 mm); 1191 N (40 mm); 667 N (30 mm).

Manufacturer guidance

Breaking load at dowel hole (at 75, 50, 40 and 30 mm thick). Average values.

Water absorption (maximum)

To BS EN 13755, 9.76%.

Guidance for specification option:

Lowest expected value 3.06%, average value 5.78%.

Compression strength

To BS EN 1962, 43.64 MPa.

Guidance for specification option:

Lowest expected value 24.14 MPa, highest expected value 71.75 MPa.

Manufacturer guidance

Average value.

Flexural strength

To BS EN 13161, 3.01 MPa.

Guidance for specification option:

Lowest expected value 1.86 MPa, highest expected value 4.67 MPa.

Manufacturer guidance

Average value.

Density

To BS EN 1936, 2198 kg/m³.

Guidance for specification option:

Lowest expected value 2014 kg/m³, highest expected value 2393 kg/m³.

Manufacturer guidance

Average value.

Porosity

To BS EN 1936, 18.48%.

Guidance for specification option:

Lowest expected value 11.89%, highest expected value 26.63%.

Manufacturer guidance

Average value.

Saturation coefficient

To BS EN 12370, 0.64.

Guidance for specification option:

Lowest expected value 0.52, highest expected value 0.82.

Manufacturer guidance

Average value.

Abrasion resistance

To EN 14157, 23.63.

Guidance for specification option:

Lowest expected value 22.10, highest expected value 25.30.

Manufacturer guidance

Average value.

Light reflectance

57.00 (mean value).

Guidance for specification option:

Value from Grove Whitbed test, however these stones are very similar.

Manufacturer guidance

Light reflectance tested using NCL Colour Scan instrument - Grit 60.

Water absorption by capillarity

To BS EN 1925, 59.41 g/m².sec-².

Thermal shock resistance

To BS EN 14066, 4.51%.

Guidance for specification option:

Lowest expected value 0%, highest expected value 32%.

Manufacturer guidance

Average value.

(% change in elastic modulus).

Freeze thaw cycle

In accordance with EN 1341, 3.40 MPa.

Guidance for specification option:

Lowest expected value 0.66 MPa, highest expected value 12.17 MPa.

Manufacturer guidance

Freeze/ Thaw - Flexural strength.

To BS EN 12372 and 14066 (after 56 cycles).

Average value.

Sustainability data

Contains Red List materials

No

Country of material origin

United Kingdom

Country of product manufacture

United Kingdom

Material

Limestone

A1-A3 (production stage)

Normalised unit

0 kg CO₂ eq/kg

Declared unit

0.04 kg CO₂ eq/kg

Self-declared

Recyclability

100%

Recycled content

As defined in clause 7.8 of BS EN ISO 14021

0 %

Literature

TDS - Jordans Whitbed

TDS - Jordans Whitbed

TDS - Jordans Roach

TDS - Jordans Roach

TDS - Jordans Basebed

TDS - Jordans Basebed

TDS - Grove Whitbed

TDS - Grove Whitbed

TDS - Fancy Beach Whitbed

TDS - Fancy Beach Whitbed

TDS - Bowers Roach

TDS - Bowers Roach

TDS - Bowers Basebed

TDS - Bowers Basebed

TDS - Bowers Whitbed

TDS - Bowers Whitbed

CE - External Paving - Bowers Roach

CE - External Paving - Bowers Roach

CE - External Paving - Bowers Whitbed

CE - External Paving - Bowers Whitbed

CE - External Paving - Fancy Beach Whitbed

CE - External Paving - Fancy Beach Whitbed

CE - External Paving - Grove Whitbed

CE - External Paving - Grove Whitbed

CE - External Paving - Jordans Roach

CE - External Paving - Jordans Roach

CE - External Paving - Jordans Whitbed

CE - External Paving - Jordans Whitbed

Case studies

British Memorial Garden

British Memorial Garden

Portland Marina

Portland Marina

Private Residence, Sheffield

Private Residence, Sheffield

Private Residence, Flinders

Private Residence, Flinders

Wilkins Terrace, UCL

Wilkins Terrace, UCL