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Heading: 1.1Cement Temperature
What is the maximum cement temperature at delivery that should be accepted?

At this temperature what effects can I expect in the concrete (not including, hotter concrete) and what should be done to counter-act these effects.



Peter Schwenger

The Portland Cement Association did an exhaustive study on this and the net result was that higher cement temperatures caused no meaningful problems other than to increase the concrete temperature. In the hot summer months, hot materials regardless whether they are cement, stone, sand or water will elevate concrete temperatures where it may become difficult to meet concrete temperature ceilings called for in project specifications. This may mean that a producer will need to sprinkle stockpiles to keep aggregate temperatures down. He may need to add ice as a partial replacement of some of his mix water. The most important factor is not the cement temperature but the concrete temperature. High concrete temperatures lead to lower strengths, slump loss, adding water on jobsites, increased shrinkage, higher potential for cracking, etc. Some contractors pour early morning to avoid high ambient temperatures in the PM.

Fred Croen
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