Explain how air-entrainment in concrete increases concrete's durability to freeze-thaw action.
What will be an ideal response?
Concrete that is exposed to weather absorbs water, which expands on freezing and contracts on thawing. The stresses so caused weaken concrete over time, leading to its rupture into fragments. The air-entraining chemical in concrete introduces microscopic air voids, which release the pressure caused by expansion and contraction, increasing concrete's durability to freeze-thaw.
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Condensed tower product that is pumped back into a tower to increase product purity and control temperature:
a. overlap b. reflux c. side-stream d. accumulation
Describe the 500 mile service.
What will be an ideal response?
A money-back promise from a manufacturer that you will receive a full refund if the product does not meet your needs is called a ________
A) Joke B) Guarantee C) Warranty D) All of the above
Why is low water a dangerous condition for a boiler?
A) A boiler that is low on water can create steam pressure and explode as a result. B) A boiler that is low on water can cause the burners to overheat. C) A boiler that is low on water can cause excessive energy bills. D) A boiler that is low on water will have higher-than-normal internal mineral deposits.