Our experience with concrete in the summer is that it has not always been predictable. The time available for placing sometimes changes unpredictably within a single day. is there any way to anticipate better what is happening?

Since there are so many things that affect the rate of setting it is sometimes easy to overlook one or more of them. It is good practice for foremen or inspectors to keep a chart on which they record the following information:

  • air temperature
  • relative humidity
  • whether windy or calm
  • whether clear or cloudy
  • concrete temperature as received
  • concrete temperature after placing
  • kind of member and thickness
  • any difficulties experienced
  • Continued study of these records from day to day will often reveal which factors to be most alert for.