§ Mr. Robert Hughes
asked the Secretary of State for Scotland if he will now issue regulations defining calcium chloride as a prohibited substance for use for the quick setting of reinforced concrete in all systems of construction of buildings or bridges.
§ Mr. Hugh D. Brown
The British Standards Institution's Committee has decided to issue amendments as soon as possible to the codes of practice on the structural uses of concrete, recommending that calcium chloride should never be added to reinforced concrete. The present codes already advise against its use generally in prestressed concrete. As soon as these amendments have been published, an amendment to the building standards regulations will be proposed which will enable local authorities to prevent the use of calcium chloride in all forms of reinforced and prestressed concrete construction in buildings. The use of the material in reinforced and prestressed concrete in bridges is not permitted under the standard specification for road and bridge work.