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Building Materials

Building Materials
Addition of pozzolana to ordinary Portland cement increases

Heat of hydration
Bleeding
Shrinkage
Permeability

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Building Materials
The most important tool in brick laying for lifting and spreading mortar and for forming joints is

Trowel
Bolster
Square
Scutch

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Building Materials
The proportions of charcoal, saltpetre and sulphur in gun powder by weight, are respectively:

15, 75, 10
10, 15, 75
75, 10, 15
10, 75, 15

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Building Materials
A good brick earth should contain:

About 50% to 60% of silica
All listed here
About 20% to 30% of alumina
Not more than 5% of lime

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Building Materials
The constituent of cement which is responsible for all the undesirable properties of cement is

Tri-calcium aluminate
Di-calcium silicate
Tetra calcium alumino ferrite
Tri-calcium silicate

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Building Materials
During smelting process, the combination of fuel in the furnace

Carbon mono-oxide reacts with Fe2O3 to form iron and liberates CO2
Forms carbon dioxide
All listed here
Carbon dioxide with carbon forms carbon mono-oxide

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