306R-16: Guide to Cold Weather Concreting is one of many numerous, valuable resources on cold weather concrete practices by the American Concrete Institute (ACI, www.concrete.org). 306R-16 guides specifiers, contractors, and concrete producers through the selection processes that identify methods for cold weather concrete — concrete properties and the construction operations of mixing, transporting, and placing of the concrete materials in cold weather.
306R-16: Guide to Cold Weather Concreting highlights the five objectives of cold weather concreting practices:
- Prevent damage to concrete due to freezing at early ages;
- Ensure that the concrete develops the recommended strength for safe removal of forms;
- Maintain curing conditions that foster normal strength development;
- Limit rapid temperature changes, and;
- Provide protection consistent with intended serviceability of the structure.
The American Concrete Institute (ACI, www.concrete.org) and ACI Committee 306 – Cold Weather Concreting highlight that concrete placed during cold weather will develop sufficient strength and durability to satisfy intended service requirements only when concrete is properly proportioned, produced, placed, and protected.
306R-16: Guide to Cold Weather Concreting addresses the 12 following topics about cold weather concrete — concrete properties and the construction operations of mixing, transporting, and placing of the concrete materials in cold weather:
- INTRODUCTION AND SCOPE
- NOTATION AND DEFINITIONS
- OBJECTIVES, PRINCIPLES, AND ECONOMY
- GENERAL RECOMMENDATIONS
- TEMPERATURE OF CONCRETE AS MIXED AND PLACED, AND HEATING OF MATERIALS
- PREPARATION BEFORE CONCRETING
- PROTECTION AGAINST FREEZING FOR CONCRETE NOT REQUIRING CONSTRUCTION SUPPORTS
- PROTECTION AGAINST FREEZING FOR STRUCTURAL CONCRETE REQUIRING CONSTRUCTION SUPPORTS
- EQUIPMENT, MATERIALS, AND METHODS OF TEMPERATURE PROTECTION
- CURING RECOMMENDATIONS AND METHODS
- ACCELERATION OF SETTING AND STRENGTH DEVELOPMENT
- REFERENCES
Keywords: accelerating admixtures; cold weather; compressive strength; construction; curing; formwork; freezing; heating; insulation; maturity; protection; temperature.
(Source: American Concrete Institute, www.concrete.org)
More in the next blog about cold weather concreting…