restrictions on the use of wire bar chairs

www.sria.com.au T E C H N I C A L N O T E The Steel Reinforcement Institute of Australia is a national non-profit organisation providing information on the many uses of steel reinforcement and reinforced concrete. Since the information provided is intended for general guidance only, and in no way replaces the services of professional consultants on particular projects, no legal liability can be accepted for its use. RESTRICTIONS ON THE USE OF WIRE BAR CHAIRS Use of plastic-tipped wire bar chairs in concrete structures within 1 km of the coast. AS 3600, Concrete Structures, Table 4.3, classifies exterior above-ground environments that are within 1 km of a coastline as B2 in any climatic zone. It is now considered that plastic-tipped wire chairs should not be used in B2 or more severe environments. This restriction has been established after bar chair load tests and the potential for corrosion of chairs and subsequent staining of concrete surfaces in B2 environments. As from 1st July 2006, SRIA will advise reinforcement companies to schedule plastic bar chairs for all projects that are known to be within 1 km of the coast (B2 classification). January 2007 Plastic-tipped wire Plastic 3

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Restrictions on the Use of Wire Bar Chairs

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www.sria.com.au TECHN

ICAL

NOTE

The Steel Reinforcement Institute of Australia is a national non-profit organisation providinginformation on the many uses of steel reinforcement and reinforced concrete. Since theinformation provided is intended for general guidance only, and in no way replaces the services of professional consultants on particular projects, no legal liability can be accepted for its use.

RESTRICTIONS ON THE USE OF WIRE BAR CHAIRSUse of plastic-tipped wire bar chairs in concrete structures within 1 km of the coast.

AS 3600, Concrete Structures, Table 4.3, classifies exterior above-ground environments that are within 1 km of a coastline as B2 in any climatic zone.

It is now considered that plastic-tipped wire chairs should not be used in B2 or more severe environments.

This restriction has been established after bar chair load tests and the potential for corrosion of chairs and subsequent staining of concrete surfaces in B2 environments.

As from 1st July 2006, SRIA will advise reinforcement companies to schedule plastic bar chairs for all projects that are known to be within 1 km of the coast (B2 classification).

January 2007

Plastic-tipped wire Plastic

910

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