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.
Concrete should be in place within 90 minutes of its loading at the concrete plant. Is it true that concrete shrinks? Yes. As it cures, concrete shrinks roughly Â½â for every 100 linear feet. Doesnât this shrinkage cause the concrete to crack? Yes. Control joints should be put in the concrete to provide a place for stress relief (read 'cracking'). Control joints should be 2 to 3 times (in feet) the thickness of the slab in inches. i.e. a 4 slab should have control joints every 8 to 12 feet. Control joints should be Â¼ the thickness of the slab. Thus a 4 sidewalk should have 1 deep control joints.