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AB Three - Precast concrete interlocking blocks

Verified by manufacturer 9 months ago

Product certifications:

NSAI Agrément Certificate
Certificate type
BBA Agrément Certificate
Certificate type

AB Three Mortarless Retaining Wall Blocks allow for the construction of mortarless retaining walls with a 3 degree setback.

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BOS

+44 (0)28 9061 8145 Website

Application

Suitable for:

All types of road and rail infrastructure projects that require approval by the Highways Agency (the product holds a BBA Roads and Bridges certificate).
Large commercial and residential walls.
Low gravity (unreinforced) walls.

Description

Allan Block is a hollow-core, dry-stacking concrete block for the construction of retaining walls. Designed with a 3° raised front lip which automatically establishes the setback from vertical.

Manufactured from a mixture of aggregates (65% recycled secondary aggregate content) and cement.

Features and benefits:

Cost-effective and versatile.
Offers high performance, quality, and lasting value.
Expected lifespan of 120 years (if designed and built in accordance with its British Board of Agrément (BBA), Roads and Bridges certificate).
Includes a hollow-core design which makes blocks easy to handle, promotes drainage and becomes solid when filled with stone.
Depending on site conditions, walls can be constructed up to 1.1 m in height, using the blocks and granular fill only.
Taller walls will require reinforcement, most often through the use of Geogrid, No-Fines Concrete or building a double-width gravity wall.
CE-marked and manufactured in accordance with BS EN 771-3, ISO 9001 and ISO 14001.
Anti-climb edge.
No need for pins, clips or mortar.
Can be constructed regardless of weather conditions.
Built-in drainage.
Durable and maintenance-free.
Freeze-thaw resistance.
High strength, durable block.
Efflorescence-free.

General information

Color	Grey Manufacturer guidance Abbey Blend, Cinder Blend, Limestone Blend, Pewter Blend, Slate Blend, Yorkstone Blend.
Finish	- Manufacturer guidance Split-face finish.
Material	Concrete
Shape	Rectangle
Length	450 mm
Width	300 mm
Height	200 mm

Uniclass	Pr_20_93_71_15 Concrete interlocking blocksPrimary
CAWS	D41/310 Drystack interlocking masonry F10/18 Concrete facing blockwork F10/255 Concrete facing blockwork

Product range	Blocks

Specification data - Concrete interlocking blocks

Standard	To BS EN 771-3.
Properties	-
Dimensions	450 x 300 x 200 mm.
Weight	35 kg.
Special units	-
Type of special unit	Not required. AB Corner Block. Guidance for specification option: H x W x D: 200 x 400 x 200 mm. Available left or right-handed, 26 kg. Insert requirements. AB Wall Caps. Guidance for specification option: H x W x D: 100 x 450 x 300 mm. Weight: 27 kg To be fixed with a high-grade, waterproof, flexible masonry adhesive. Geogrid. Guidance for specification option: For use when the block weight and setback do not provide enough structural support. For taller walls. Typical Geogrid reinforced walls will require an excavation depth of 70% or more of the wall height, to accommodate geogrid tails. Consult manufacturer for information. No-Fines Concrete Backfill. Guidance for specification option: Will allow taller walls to be constructed with less excavation. For taller walls. Will require an excavation depth of approximately 40% of the wall height. Consult manufacturer for information.
Dimensions of special units	- Manufacturer guidance As 'Type of special unit' selected above. Consult manufacturer for details and insert requirement.
Finish	-
Exposed faces	Split-face texture.
Concealed faces	Split-face texture.
Colour	Abbey blend. Cinder blend. Limestone blend. Pewter blend. Slate blend. Yorkstone blend.
Recycled content As defined in clause 7.8 of BS EN ISO 14021	65%. Guidance for specification option: Secondary aggregate content.

Block description	Split-face texture, hollow-core, dry-stacking, precast interlocking concrete blocks. Guidance for specification option: Material: Concrete mixture of aggregates and cement. Raised front lip: 3° (automatically establishes the setback from vertical).
Angle	Setback: 3°.
Average density	2100 kg/m³.
Water absorption	3–6%.
CoverageArea	11.11 m² (approximately). Guidance for specification option: Face coverage.
Efflorescence	None.
Compressive strength (mean value)	30 N/mm².
Life expectancy	120 year. Guidance for specification option: If designed and built in accordance with its British Board of Agrément (BBA), Roads and Bridges certificate.

Sustainability data

Country of material origin	United Kingdom
Country of product manufacture	United Kingdom
Material	Concrete
Recycled content As defined in clause 7.8 of BS EN ISO 14021	65 % Guidance for specification option: Secondary aggregate content.