Concrete Technology

Q: Concrete gains strength due to

(a) :  chemical reaction of cement with sand and coarse aggregates
(b) :  evaporation of water from concrete
(c) :  hydration of cement
(d) :  all the above.
(e) :  None of these
Answer:  all the above
Explanation:  

Q: Addition of pozzolana to ordinary port land cement, causes

(a) :  decrease in early strength
(b) :  reduction in chemical action with sulphates
(c) :  increase in shrinkage
(d) :  all the above.
(e) :  None of these
Answer:  all the above
Explanation:  

Q: While compacting the concrete by a mechanical vibrator, the slump should not exceed

(a) :  2.5 cm
(b) :  5.0 cm
(c) :  5.5 cm
(d) :  6.0 cm
(e) :  None of these
Answer:  5.0 cm
Explanation:  

Q: Pick up the correct proportions of chemical ingredients of cement

(a) :  Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3
(b) :  Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3
(c) :  Alumina : Silica : Lime : Iron oxide : 63 : 22 : 6 : 3
(d) :  Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3
(e) :  None of these
Answer:  Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3
Explanation:  

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