Concrete Technology

Q: Hydration of cement is due to chemical action of water with

(a) :  Tricalcium silicate and dicalcium silicate
(b) :  Dicalcium silicate and tricalcium aluminate
(c) :  Tricalcium aluminate and tricalcium alumino ferrite
(d) :  all the above.
(e) :  None of these
Answer:  all the above
Explanation:  

Q: According to I.S. : 456, the number of grades of concrete mixes, is

(a) :  3
(b) :  4
(c) :  5
(d) :  7
(e) :  None of these
Answer:  7
Explanation:  

Q: The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary method of proportioning

(a) :  0.04238425925925926
(b) :  0.04310185185185186
(c) :  0.04381944444444445
(d) :  0.04456018518518518
(e) :  None of these
Answer:  0.04456018518518518
Explanation:  

Q: C.R.R.I. charts are used to obtain a relatioship between strength of concrete and

(a) :  water cement ratio
(b) :  workability
(c) :  grading of aggregate
(d) :  fineness modulus
(e) :  None of these
Answer:  water cement ratio
Explanation:  

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