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Highway Official : When resurfacing our concrete bridges, we

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Highway Official : When resurfacing our concrete bridges, we [#permalink] New post 03 Apr 2013, 02:55
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Highway Official: When resurfacing our concrete bridges, we should use electrically conductive concrete (ECC) rather than standard concrete. In the winter, ECC can be heated by passing an electric current through it, thereby preventing ice buildup. The cost of the electricity needed is substantially lower than the cost of the de-icing salt we currently use.
Taxpayer: But construction costs for ECC are much higher than for standard concrete, so your proposal is probably not justifiable on economic grounds.
Which of the following, if true, could best be used to support the highway official’s proposal in the face of taxpayer’s objection?

A. The use of de-icing salt causes corrosion of the reinforcing steel in concrete bridge decks and damage to the concrete itself, thereby considerably shortening the useful life of concrete bridges.

B. Severe icing conditions can cause power outages and slow down the work of emergency crews trying to get power restored.

C. In weather conditions conducive to icing, ice generally forms on the concrete surfaces of bridges well before it forms on parts of the roadway that go over solid ground.

D. Aside from its potential use for de-icing bridges, ECC might also be an effective means of keeping other concrete structures such as parking garages and airport runways ice free.

E. If ECC were to be used for a bridge surface, the electric current would be turned on only at times at which ice was likely to form.

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Re: Highway Official: When resurfacing our concrete bridges, we [#permalink] New post 03 Apr 2013, 03:02
my take is A :The use of de-icing salt causes corrosion of the reinforcing steel in concrete bridge decks and damage to the concrete itself, thereby considerably shortening the useful life of concrete bridges.
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Re: Highway Official: When resurfacing our concrete bridges, we [#permalink] New post 03 Apr 2013, 03:09
We are looking for an answer that supports the fact that ECC in the long-period will be cheaper than normal concrete

A. The use of de-icing salt causes corrosion of the reinforcing steel in concrete bridge decks and damage to the concrete itself, thereby considerably shortening the useful life of concrete bridges.
CORRECT: corrosion = short life = more money spent on repairs and maintenance
B. Severe icing conditions can cause power outages and slow down the work of emergency crews trying to get power restored.
This is not related to costs.
C. In weather conditions conducive to icing, ice generally forms on the concrete surfaces of bridges well before it forms on parts of the roadway that go over solid ground.
Again , out of scope because doen't adess the point.
D. Aside from its potential use for de-icing bridges, ECC might also be an effective means of keeping other concrete structures such as parking garages and airport runways ice free.
Out of scope
E. If ECC were to be used for a bridge surface, the electric current would be turned on only at times at which ice was likely to form.
This doesn't show that ECC will save more money than normal concrete.It only says that the electric current would be turned on only at times at which ice was likely to form, so that ECC will be used "wisely"...
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Re: Highway Official: When resurfacing our concrete bridges, we   [#permalink] 03 Apr 2013, 03:09
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