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Which type of concrete is useful in high rise construction?

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Which type of concrete is useful in high rise construction?

(a) Cellular light weight concrete

(b) Cast-in-situ fly ash

(c) Fly ash stone powder bricks

(d) Sintered light weight aggregates

I have been asked this question during an internship interview.

The question is from Ash and its Effects on Boiler Operation and Performance topic in chapter Steam Generators & Accessories of Energy Engineering

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Right choice is (a) Cellular light weight concrete

The best I can explain: Cellular light weight cement can be manufactured by a process involving the mixing of fly ash, cement, coarse sand fine and a foaming agent. The slurry formed is poured in moulds and allowed to set. The blocks are then removed and cured by spraying water on the stack. The blocks are especially useful in high rise construction reducing the dead weight of the structure.

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