Discussion
Which of the following is a lightweight and manufactured aggregate, which is used to produce lightweight concrete?
Answer: C
Bloated clay (expanded clay) is a manufactured lightweight aggregate. Clay is heated in a rotary kiln until gases are given off and make it swell into light, cellular pellets. Diatomite, tuff and pumice are naturally occurring lightweight materials: diatomite is formed from the fossil shells of diatoms, tuff from volcanic ash and pumice from volcanic froth. They are used as found, and so are not manufactured aggregates.
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