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Building Materials

Building Materials
Addition of pozzolana to ordinary Portland cement increases

Bleeding
Shrinkage
Permeability
Heat of hydration

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Building Materials
The process of manufacturing steel by heating short lengths of wrought iron bars mixed with charcoal in fire clay crucibles and collecting the molten iron into moulds, is known as

Bessemer process
Crucible process
Open hearth process
Cementation process

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Building Materials
The cast iron when heated to red heat with powdered red haematite in an oven for increasing its toughness, is converted to

White cast iron
Grey cast iron
Mottled cast iron
Toughed cast iron

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Building Materials
The rocks in which argil (or clay) predominates, are called

Argillaceous rocks
Calcareous rocks
Siliceous rocks
Igneous rocks

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Building Materials
The rock generally used for roofing, is

Pumice
Basalt
Granite
Slate

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Building Materials
First class timber has an average life of

Less than one year
More than 10 years
1 to 5 years
5 to 10 years

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