What is the effect of high concrete temperature

What is the effect of high concrete temperature (above 77°F) on transporting, placing, and finishing concrete, and on hardened concrete properties?

A: When the temperature of freshly mixed concrete exceeds 77°F (25°C) there may be a number of effects on the fresh and hardened properties of concrete.One of the effects on fresh concrete properties is accelerated setting, which leads to a shorter time period for transporting the concrete to the job site, and a shorter window for placement, consolidation, and finishing of the material.
The higher temperature also leads to a higher water demand to maintain the concrete at the specified slump, which can tempt the contractor to add water to retemper the mixture leading to lower than expected compressive strength of the hardened material. In addition mixtures at high temperatures may require higher dosages of air-entraining admixtures to produce the required air content for durability in severe climates. The effect on hardened concrete properties are a high early strength but low ultimate strength compared to mixtures placed with a lower temperature. In addition, if no precautions are taken, there is an increased potential for plastic shrinkage cracking during the finishing operations, and increased potential for cracking due to volume changes caused by drying shrinkage and thermal effects.