Concrete Technology Sheet 15
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1) Question.
For a given degree of hydration, the effect of increasing water-cement ratio in concrete
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2) Question.
To ensure durability for similar conditions of exposure, water-cement ratio in reinforced concrete as compared to that in plain concrete is
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3) Question.
According to IS : 456-1978, the maximum water-cement ratio in plain concrete to ensure durability in mild exposure is limited to
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4) Question.
For reinforced concrete exposed to sulphate attack minimum grade required is
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5) Question.
Curing period required is minimum for the concrete using
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6) Question.
The ratio of different ingredients (cement, sand and aggregate) in concrete mix of grade M20 is -
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7) Question.
In order to prepare a test specimen, it is necessary to -
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8) Question.
After moulding, the test specimen of trial mix are placed at a temperature of -
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9) Question.
In performing preliminary test -
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10) Question.
The test conducted in the laboratory on the specimen made out of trial concrete mix is called -
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11) Question.
The concrete mix of grade M 25 means that the compressive strength of 15 cm cubes at 28 days after mixing is -
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12) Question.
Which of the following grade is not recommended by IS 456-1978 -
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13) Question.
As per IS:459-1978, the concrete mixes are designated into -
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14) Question.
The main object of proportioning concrete is to obtain -
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15) Question.
More water should not be added in the concrete mix, as to increase -
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16) Question.
A compaction factor of 0.88 indicates that the workability of concrete mix is -
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17) Question.
If the slump of concrete mix is 70 mm, its workability is considered to be -
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18) Question.
The workability of concrete by slump test is expressed as -
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19) Question.
Workability of concrete mix having very low water-cement ratio should be obtained by -
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20) Question.
For high degree of workability, the compaction factor is -
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