NEW GUIDANCE for working with concrete in ground containing harmful chemicals such as sulfate was published last month.
BRE Special Digest SD1: Concrete in aggressive ground is aimed at construction professionals 'who design, specify and construct concrete for use in the ground and ground engineers who assess sites for such concrete' Published in four parts, the report identifies chemicals in the ground that can be potentially harmful to concrete, the types of cement and aggregate suitable for aggressive conditions and design guides for cast insitu and precast concrete.
'Parts 1 and 2 will be of particular interest to geotechnical professionals, ' said the report's technical editor Ian Longworth, associate director of the BRE's Centre for Ground Engineering and Remediation.
Part 1 identifies chemicals in the ground that are potentially harmful to concrete and describes procedures for assessing the Aggressive Chemical Environment for Concrete (ACEC) Class of the ground.
Part 2 provides general recommendations for the types of cement and aggregate and the type and quality of concrete suitable for use in aggressive chemical conditions.
Amendments to the BSI concrete standard, which were drawn up in tandem with the report, are due out for public consultation.
The two documents will also be of international use, particularly in respect to combating the thaumasite form of sulfate attack (GE April 1999).
l BRE Special Digest (SD1) Concrete in aggressive ground is published by CRC, tel:020 7505 6622; email: crc@construct. emap. com or from the BRE on-line bookshop at www. brebookshop. com