For the manufacture of Portland cement, the proportions of raw materials used, are

silica 70% ; lime 20% ; other ingredients 10%.

lime 22% ; silica 63% ; other ingredients 15%

lime 63% ; silica 22% ; other ingredients 15%

silica 40% ; lime 40% ; other ingredients 20%

Correct Answer : lime 63% ; silica 22% ; other ingredients 15%

Recently Updated in Building Materials Questions

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

75, 10, 15

10, 15, 75

15, 75, 10

10, 75, 15.

Correct Answer : Option (C) : 15, 75, 10

A 1st class brick immersed in water for 24 hours, should not absorb water (by weight) more than ____

10%

15%

20%

25%

Correct Answer : Option (C) : 20%

According to IS 399-1963, the weight of the timber is specified at ______

12% moisture content

14% moisture content

8% moisture content

10% moisture content

Correct Answer : Option (A) : 12% moisture content