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2 years ago

Most concrete used in construction today is made with Portland cement. true or false

Engineering

2 answers:

Rainbow [258]2 years ago

8 0

Answer:

*True*

Explanation:

Today's concrete is made using Portland cement, coarse and fine aggregates of stone and sand, and water. However, cement is not concrete. Concrete is a composite building material and the ingredients, of which cement is just one, have changed over time and are changing even now.

Marianna [84]2 years ago

4 0

Answer:

True

Explanation:

Portland cement is made out of stone, sand and water.

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Answer:

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3 years ago

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A 200 W vacuum cleaner is powered by an electric motor whose efficiency is 70%. (Note that the electric motor delivers 200 W of

Goshia [24]

Answer:

The rate at which this vacuum cleaner supply energy to the room when running is 285.71 Watts.

Explanation:

power efficiency of electric motor = 70% = 0.70

The power output of the vacuum cleaner = $P_o$ = 200 W

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The rate at which this vacuum cleaner supply energy to the room when running is 285.71 Watts.

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2 years ago

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Answer:

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3 years ago

6. Driving with parking lights only (in place of headlights) is against the law. A. True B. False

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Answer:

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Hope this helps :)

Explanation:

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3 years ago

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The waffle slab is: a) the two-way concrete joist framing system. b) a one-way floor and roof framing system. c) the one-way con

GREYUIT [131]

Answer:

a) the two-way concrete joist framing system

Explanation:

A waffle slab is also known as ribbed slab, it is a slab which as waffle like appearance with holes beneath. It is adopted in construction projects that has long length, length more than 12m. The waffle slab is rigid, therefore it is used in building that needs minimal vibration.

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3 years ago