Related Questions

The basic purpose of a retarder in concrete is
A To increase the initial setting time of cement paste in concrete
B To decrease the initial setting time of cement paste in concrete
C To render the concrete more water tight
D To improve the workability of concrete mix
For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of
A 1 : 2
B 1 : 3
C 1 : 4
D 1 : 6
The maximum quantity of calcium chloride used as an accelerator in cement in percentage by weight of cement is
A 1
B 2
C 3
D 4
The ratio of sand to gravel in a mixture is 7 : 8 while that between gravel and cement is 6 : 7. What is the ratio of sand to cement in the mixture?
A 49 : 48
B 7 : 7
C 8 : 6\
D 3 : 4
Initial setting time of cement for asbestos cement products should be not less than
A 30 minutes
B 50 minutes
C 75 minutes
D 90 minutes
As compared to ordinary portland cement, high alumina cement has
A Higher initial setting time but lower final setting time
B Lower initial setting time but higher final setting time
C Higher initial and final setting times
D Lower initial and final setting times
As compared to ordinary portland cement, use of pozzuolanic cement
A Reduces workability
B Increases bleeding
C Increases shrinkage
D Increases strength
Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of portland cement. The component of Portland cement which first hardens is
A 5CaO . 3Al2O3
B 3CaO . Al2O3
C 3CaO . SiO2
D 2CaO . SiO2
The constituent of cement which is responsible for all the undesirable properties of cement is
A Di-calcium silicate
B Tri-calcium silicate
C Tri-calcium aluminate
D Tetra calcium alumino ferrite
The main constituent of cement which is responsible for initial setting of cement is
A Dicalcium silicate
B Tricalcium silicate
C Tricalcium aluminate
D All of the above

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