Optimized Design of Pre-cooling System for Concrete Construction for Caojie Pivotal Project for Navigation and Power Generating on Jialingjiang River in Chongqing

To optimize the design of the pre-cooling system for concrete construction for Caojie Pivotal Project for Navigation and Power Generating,the original plan of"primary forced air cooling + cooling water + mixing with crushed ice"was substi-tuted with the alternative of "twice forced air cooling and mixing with cooled water".The analyses of the measured results and the design parameters showed that all the indices of the pre-cooling system for concrete construction in the alternative of "twice force air cooling + mixing with cooled water" met the design requirements and the modeled strength of the pre-cooled concrete met also the design requirements with the significant increase of thorough coolness of air cooled aggregate,thus making the tem-perature of concrete re-rise slowly during its transportation and placement.Implementation of the system indicated that the opti-mized alternative involved less one-go investment and had high efficiency in operational readjustment,facilitating operational management of the system.