ingredients. When you heat either aggregate or water above 100F, combine them in the mixer first before adding
the cement Figure 4-18 shows how the temperature of its ingredients affects the temperature of fresh concrete.
This graph is reasonably accurate for most ordinary concrete mixtures. As shown in Figure 4-18, mixing water
should not be hotter than 180F so that, in some cases, you must heat both aggregate and water. For example, if
the weighted average temperature of aggregate is below 36F and the desired fresh concrete temperature is 70F,
you should heat the water to its maximum temperature of 180F and also heat the aggregate to make up the
Figure 4-18. Effects of temperature of materials on temperature of fresh concrete.