HOT | COLD WEATHER CONCRETING

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COLD WEATHER CONCRETE

The following information will help you successfully place concrete in cold weather. As always, Cemstone is committed to our mutual success and following these guidelines will result in satisfied customers.

Special precautions are needed for placing concrete in cold weather conditions. Cemstone uses heated mixing water and if needed, heated aggregates to keep concrete temperatures at the time of batching above 60°F in cold weather.

The slider below explores ten items that will help prevent cold weather concrete issues.

COLD WEATHER RESOURCES

Hot weather is any combination of the following conditions that tends to impair the quality of freshly mixed concrete by accelerating the rate of moisture loss and rate of cement hydration, or otherwise causing detrimental results:

  • High ambient temperature
  • High concrete temperature
  • Low relative humidity
  • High wind speed
  • Solar radiation

IT SHOULD BE NOTED THAT, HOT WEATHER CAN OCCUR DURING THE SPRING, FALL AND WINTER MONTHS.

 

The following list of practices and measures to reduce or avoid the potential problems of hot weather concreting are:

  • Schedule a pre-placement meeting to discuss the requirements of hot weather concreting
  • Select concrete materials and proportions with satisfactory records in hot weather conditions
  • Reducing and controlling the temperature of the fresh concrete
  • Use a concrete consistency (slump) that permits rapid placement and effective consolidation
  • Minimize the time to transport, place, consolidate, and finish the concrete
  • Plan the job to avoid adverse exposure of the concrete to the environment; schedule placing operations during times of the day or night when weather conditions are favorable;
  • Protect the concrete from moisture loss during placing and curing periods

Potential problems for concrete in the freshly mixed state are:

  • Increased water demand
  • Increased rate of slump loss and corresponding tendency to add water at the job site
  • Increased rate of setting, resulting in a greater difficulty with handling, compacting and finishing and a greater risk of cold joints
  • Increased tendency for plastic shrinkage and thermal cracking
  • Increased difficulty in controlling entrained air content

Potential deficiencies to concrete in the hardened state may include:

  • Decreased strengths resulting from higher water demand
  • Increased tendency for drying shrinkage and differential thermal cracking from either cooling of the overall structure or from temperature differentials within the cross section of the member
  • Decreased durability resulting from cracking
  • Greater variability of surface appearance, such as cold joints or color difference due to
    different rates of hydration or different water-cementitious material ratios (w/cm)

HOT WEATHER RESOURCES

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