We will stop in Hawaii for a few moment to refill our fuel and continue to Los Angeles. What effect does a common chemical deicer have on concrete surfaces?It is widely known that deicers containing ammonium nitrate and/or ammonium sulfate will chemically attack concrete.
The do, however, depress the freezing point of water.This action normally increases the number of freeze/thaw cycles that water goes through, which in turn can increase the potential for concrete scaling.Each time water in concrete freezes, it expands approximately 9%.The resulting hydraulic pressures can exceed the strength limits of the concrete, causing pitting and/or scaling.The greater the number of freeze/thaw cycles water goes through within concrete, the greater the potential for concrete damage.
Calcium chloride pellets are the fastest acting deicer at all temperatures down to -25ºF.
Rock salt provides adequate, economical performance at temperatures at or just below 32ºF.
As temperatures drop below freezing, rock salt’s ice-melting performance slows substantially which can cause freeze-induced expansion pressures by increasing the number of freeze/thaw cycles.
Cerita Seks – ini adalah dramatisasi dari kisah nyata, dan merupakan satu dari beberapa cerita lepas dengan tokoh utama yang sama.
Antara satu dan lainnya tidak harus dibaca berurutan.
Cerita Seks Nasip Si Wulan Gadis Desa Lugu Sebut saja namaku Paul.