The compressive strength requirements of 53 grade O.P.C. cement as per IS 12269 at 3, 7 and 28 days in N/mm are
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42%
33, 43, 53
26%
27, 47, 53
20%
33,47, 53
11%
27, 45, 53
Which of the following is not a major constituent of fly-ash?
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11%
Aluminum oxide
23%
Silica
19%
Ferrous oxide
47%
Cobalt oxide
What is the initial setting time for lime pozzolona?
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59%
Half an hour
16%
One hour
19%
One and a half hour
6%
Two hours
When compared with Tri-calcium silicate, Tri calcium aluminate reacts with water
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68%
Faster
20%
Slower
10%
Takes the same time
3%
Does not react at all
Maximum content (kg/m) of ordinary portland cement in design mix of concrete (1 m3) is:
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21%
500
59%
450
11%
150
9%
400
Gypsum is added in the Portland Cement:
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14%
While mixing the raw materials.
55%
At the end of grinding the clinker into powder
10%
During burning in the rotary kiln
22%
At the beginning of the grinding the clinker.
The percentage of the slag component of Portland-slag cement varies from:
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30%
10 to 40%
47%
40 to 70%
19%
70 to 80%
4%
80 to 90%
In Portland cement the strength after two to three years is contributed by the compound:
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10%
Tetracalcium aluminoferrite
58%
Di-calcium silicate
24%
Tricalcium silicate
8%
Tricalcium aluminate
Hydration of which compound is responsible for increase in strength of cement in later age?
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10%
Tri-calcium Aluminate (C3 A)
12%
Tetra-calcium Alumino ferrite (C4 AF)
18%
Tri-calcium Silicate (C3 S)
61%
Di-calcium Silicate (C2 S)
Efflorescence in cement is caused due to the excess of
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6%
Silica
12%
Lime
4%
from aside
78%
Alkalis
Tricalcium aluminates (C3 A)
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6%
Reacts slowly with water
78%
Generates large amount of heat of hydration
15%
Has more resistance to sulphate attack
1%
Occurs in nature
The amount of water required for the complete chemical reaction of cement is
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15%
40% by weight of cement
19%
60% by weight of cement
8%
50% by weight of cement
58%
38% by weight of cement
Dear friends
Greetings.
In the above talk, I have discussed about how to use obstacle as a way to success, ultralearning ( speed learning method) and a meditation method to attain your desires.
Please watch it and get benefitted so that I need not repeat again in the class.
Thank you
Regards
Karpagam
Greetings.
In the above talk, I have discussed about how to use obstacle as a way to success, ultralearning ( speed learning method) and a meditation method to attain your desires.
Please watch it and get benefitted so that I need not repeat again in the class.
Thank you
Regards
Karpagam