On 1st October 2000, the withdrawal of Regulation 25(1)C, the ‘traditional use of exemption’ provision in the Water Supply (Water Quality) Regulations 1989, came into effect for materials use in water supply pipes, service reservoirs and water towers.
Where in-situ concrete destined for use in public supply systems contains chemical admixtures, the new regulations comprise the following requirements:-
- Water undertakers must specify structural design to EN 1992.
- The chemical identity of the components of the admixture must be in accordance with the substances specified in the ‘List of Authorised Cement Admixture Components’.
- Water undertakers must obtain a declaration from the ready-mix concrete producer that the admixture does not contain chemicals other than those on the Authorised List. Admixtures whose components are on the ‘List’ require no additional testing even for BS 6920 (Water Quality effect); in effect such admixtures have been pre-approved by virtue of inclusion of their components on the List.
Sika Concrete Admixtures in Compliance with the approved list of components in the Secretary of States List of Approved Products
The above admixtures contain biocide/preservatives and agents, antifoam/air control agents confirmed as less than 1% in total.
Admixtures must be used within the manufacturers recommended dosage.
The chemical identity of admixtures is in accordance with the chemicals specified in Section 2.4 “List of Authorised Cement Admixture Components” of Appendix 1 of the “List of Approved Products and Processes” published by the DWI.
This Declaration confirms that the admixture does not contain chemicals other than those given in the List of Authorised Cement Admixture Components.