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|Technical Bulletin #6 - Hot Weather Considerations|
Technical Bulletin #6 - Hot Weather Considerations
Currently, there is no Standard or Specification limiting the ambient air temperature for plastering. In fact, most cement and concrete trades have no such limitation. The reason for this is because hot weather plastering is much more complex than any one factor. Hot weather plastering should include the consideration, planning, and procedures necessary to limit or avoid potential issues relating to:
Hot weather, low humidity, high winds, or a combination of these, can be detrimental if appropriate measures are not in place to offset the prevailing conditions when necessary. Potential hot weather issues may include:
Actions and Procedural Considerations
The following list of precautionary measures is based on historical success and proven common trade practice. Precautionary measures may include a combination of actions and/or procedures depending on the geographic region of the country.
Mix Design (material components) Considerations
Other options (not listed above) that have a proven historical performance or that have been demonstrated to offset or lessen hot weather effects may also be used.
The following chart (nomograph) has been added as a guide to understand the hot weather relationship between ambient air temperature, material temperature, ambient air humidity, and wind speed. No single condition may be damaging, but in combination, their effects can become harmful if precautionary measures are not implemented, whenever necessary.
NOTE: If the rate of evaporation exceeds 0.2 lb/ft2/h (1 kg/m2/h), precautions against plastic shrinkage cracking are necessary.
1.) ‘Guide to Hot Weather Concreting’, ACI 305R, American Concrete Institute, 38800 Country Club Dr., Farmington Hills, MI 48331, www.concrete.org
2.) ‘Plastic Shrinkage’ (Hot Weather Nomograph), W. Lerch, ACI Journal, Proceedings, Vol. 53, No. 8, February 1957, pp 797-802.
3.) ‘Design and Control of Concrete Mixtures’, Steven Kozmatka, Michelle Wilson, 16th edition, EB001, Portland Cement Association, 5420 Old Orchard Road, Skokie ,IL 60077, www.cement.org