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# Highway Official : When resurfacing our concrete bridges, we should us

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Highway Official : When resurfacing our concrete bridges, we should us  [#permalink]

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Updated on: 21 Jan 2019, 05:45
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Question Stats:

88% (01:48) correct 12% (02:32) wrong based on 397 sessions

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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.

Originally posted by thinktank on 03 Apr 2013, 03:55.
Last edited by Bunuel on 21 Jan 2019, 05:45, edited 2 times in total.
Edited the question.
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Re: Highway Official : When resurfacing our concrete bridges, we should us  [#permalink]

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03 Apr 2013, 04:02
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 should us  [#permalink]

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03 Apr 2013, 04:09
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 should us  [#permalink]

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24 Jun 2015, 03:00
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.

How can v support the highway official’s proposal in the face of taxpayer’s objection?

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.
Traditional approach -> shortens life of bridge considerably -> increases the cost.
Now, HO proposal: ECC -> removing ice from road using electricity -> cost of the electricity needed is substantially lower than the cost of the de-icing salt
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Re: Highway Official : When resurfacing our concrete bridges, we should us  [#permalink]

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25 Jun 2016, 03:29
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options B,C,D and E are out of scope or irrelevant options
option A clearly exposes the fault in reasoning that by using de-icing salt , corrosion of steel structures occurs thereby shortening their life so correct
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Re: Highway Official : When resurfacing our concrete bridges, we should us  [#permalink]

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09 Aug 2019, 10:38

Could you explain what is issue with (E)?

Quote:
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.

HO: Use ECC than SC (std concrete)
(y) because it is more effective than using de-icing salt since electricity is cheaper

Quote:
Taxpayer: But construction costs for ECC are much higher than for standard concrete, so your proposal is probably not justifiable on economic grounds.

T: No, we should not use ECC since its construction costs are higher than SC

Quote:
Which of the following, if true, could best be used to support the highway official’s proposal in the face of taxpayer’s objection?

So I have to strengthen HO's claim (use ECC) and weaken T 's claim
Quote:
(E) If ECC were to be used for a bridge surface, the electric current would be turned on only at timesat which ice was likely to form.

This option is adding more weight to HO's premise (use electricity than salt) by mentioning we use electricity ONLY WHEN ice is likely to form.
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Re: Highway Official : When resurfacing our concrete bridges, we should us   [#permalink] 09 Aug 2019, 10:38
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