They sold us a lemon. The car broke 4 months after we bought it. Had to replace the transfer case ($4,000). The roof leaked when it rained ($500). Not to mention when we first got the car, all the...
When performing temperature tests, it is important to. use a good, accurate thermometer that is surrounded. by at least three inches of concrete. Take readings. quickly, noting that small samples lose heat fast. Concrete temperatures are affected by the mix-water. temperature, aggregate temperatures, cement type. and admixture type. Optimum concrete temperatures. will aid with setting, early strength development, proper curing and ultimately aid in achieving a higher. quality concrete. Hot concrete sets up rapidly, gaining.
Keeping Concrete from Freezing. A. Fresh concrete should be protected from freezing for the first 24 hours after placement, by which time it should have a compressive strength of 500 psi. After that, the amount and duration of protection will depend on the desired rate of strength development.