Residual water (concrete production)
As residual water is used in the manufacture and recycling of concrete refers to water, while the fines are especially cement grains contains.
The fine substances in the residual water usually have a diameter of less than 0.25 mm and their concentration varies depending on the origin of the residual water. Residual water falls z. B. when washing out concrete mixing plants, truck mixers , concrete pumps , etc. Especially when recycling fresh concrete residues, larger amounts of residual water occur, as the aggregate of the excess concrete is washed out with water.
In accordance with the DIN EN 1008 standard, residual water may be used as added water or added to fresh water. The fine fractions in the residual water must then be taken into account when calculating the mixture. For concretes with special requirements, such as B. high-strength concretes or air-entrained concretes , no residual water may be used. In the production of concrete building parts is recommended on concrete dispense with residual water.
literature
- German Institute for Standardization (publisher): DIN EN 1008 - Additive water for concrete - Specification for sampling, testing and assessment of the suitability of water, including water that occurs during concrete production, as added water for concrete .
Individual evidence
- ↑ a b Residual water from reprocessing plants for concrete production. (No longer available online.) HeidelbergCement AG, archived from the original on October 30, 2012 ; Retrieved December 24, 2013 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
