Building Materials
If the furnace is provided with insufficient fuel at low temperatures, the type of pig iron produced, is called

Grey or foundry pig
White or forge pig
Bessemer pig
Mottled pig

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Building Materials
The basic purpose of a retarder in concrete is

To increase the initial setting time of cement paste in concrete
To improve the workability of concrete mix
To decrease the initial setting time of cement paste in concrete
To render the concrete more water tight

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