How to Pour Concrete in Hot Weather

Posted On: 10/01/2018 | Posted by: DY Concrete Pumps

Pouring Concrete During the Day

The summer months typically represent one of the busier times of the year for the construction industry, which results in an increased demand for the use of concrete. However, pouring concrete in the heat of summer presents a variety of challenges that are not an issue when working in moderate temperatures.

Pouring concrete in hot weather requires addressing and overcoming obstacles such as:

  • Formation of cold joints, which are areas of weakness in the concrete that can result from the heat decreasing the setting time
  • The occurrence of hydration-related heat that can raise the internal temperature of the concrete to a level that can result in damage
  • Formation of shrinkage-related cracks that may continue to widen until you can eliminate the stresses causing the shrinkage
  • Compression testing revealing a decrease in compression strength, which is often directly related to extreme heat
  • Reduced strength and durability that can cause the need for repairs or replacement in the future
  • More difficult finishing from placing and pouring concrete during extremely hot conditions
  • Increased potential for dry shrinkage after hardening, which can negatively impact the quality of the finish

The following tips can improve your results when the temperature exceeds 77 degrees Fahrenheit:

  1. If possible, avoid pouring concrete during the hottest times of the day — attempt to schedule the pouring during the morning hours.
  2. Keep all equipment such as pumps, conveyors and chutes in a shaded area until you need them, or consider applying protective covers if there is no access to shade.
  3. Make sure you have a sufficient workforce on hand to complete the task. A single person is usually not enough to manage the concrete during pouring, placing and finishing.
  4. Keep in mind that pouring concrete in heat requires the placing of space control joints at smaller intervals than when working in colder conditions.
  5. Where possible, use sunshades to keep the concrete cooler during and after pouring.
  6. Water will evaporate more quickly as the temperature rises, so equip your laborers with an evaporative retarder so that they can prevent the mix from drying out upon application. You can also combat evaporation by reducing the mixing time after adding water.
  7. Plan on building walls and roofs before pouring indoor concrete slabs. Keep the side forms for all walls and slabs damp by applying cool water.
  8. Adding ice to the concrete water mixture can keep it cool and also help to safeguard against excess evaporation.
  9. Do not commence the finishing process until there is no more water remaining on the surface of the substrate.
  10. Ensure you implement the most appropriate curing process for the project, as doing so will ensure the concrete sets evenly and uniformly.

Contact DY Concrete Pumps for More Hot-Weather Concrete Pouring and Pumping Tips

With more than 30 years of end-user experience in providing the most advanced and reliable concrete pumping machines, we can reliably help you to maximize pouring and pumping concrete in hot weather. Contact us right away to learn more.