Specification for Hot Weather Concreting

Description

This reference specification provides requirements for hot weather concreting that the architect/engineer can apply to any construc-tion project involving hot weather concreting by citing it in the project specification. Checklists are provided to assist the architect/engineer in supplementing the provisions of this reference specifi-cation as needed by designating or specifying customized project requirements.

This specification includes hot weather requirements for production preparations, delivery, placement, finishing, bleed-water evaporation, curing, and concrete protection. Provisions governing a preplacement conference, concrete mixture proportions, maximum allowable concrete temperature, rate of surface evaporation measurements, evaporation control measures, and acceptance of a concrete mixture from past field experience or preconstruction testing are also included. The materials, processes, quality control measures, and inspections described in this document should be tested, monitored, or performed as applicable only by individuals holding the appropriate ACI Certifications or equivalent.

oncrete shall be produced at a temperature such that its maximum temperature at discharge will not exceed the accepted maximum concrete temperature. Acceptable production methods to reduce the concrete temperature include, but are not limited to, shading aggregate stock-piles, sprinkling water on coarse aggregate stockpiles, using chilled water for concrete production, substituting chipped or shaved iced for portions of the mixing water, and cooling concrete using liquid nitrogen. Substitution of other cooling methods will be considered by the architect/engineer upon written request before concrete placement and accompanied by supporting data.