Building Materials (Concrete)

Q.1. Concrete grows with age. This statement is
(a) true
(b) false
(c)  debatable
(d)  given by Duff Abrams

Q.2. Concrete in the structural member has to pass through
(a) plastic stage
(b) hardened stage
(c) both (a) and (b) above
(d) neither (a) nor (b)

Q.3. Separation of the coarse aggregate from mortar is called
(a) bleeding
(b) segregation
(c) compaction
(d) none of the these

Q.4. The ease with which concrete can be compacted fully without segregation is called
(a) bleeding
(b) segregation
(c) workability
(d) none of these

Q.5. Segregation can be prevented by
(a) properly grading the aggregate
(b) controlling water content in a mix
(c) using correct handling procedures
(d) all the above

Q.6. Separation of cement paste from sand in the mortar allowing the water or cement paste to appear at the surface is called
(a) bleeding
(b) segregation
(c) honeycombing
(d) none of these

Q.7. Consider the following statements
Sand in mortar is needed for
1. decreasing the quantity of cement
2. reducing shrinkage
3. decreasing the surface area of the binding material
4. increasing the strength
Of these statements
 (a) 2,3, and 4 are correct
(b) 1,2 and 3 are correct
(c) 1,3 and 4 are correct
(d) 1,2 and 4 are correct

Q.8. Bleeding can be prevented by
(a) controlling water content
(b) using finely ground cement
(c) controlling compaction
(d) all the above

Q.9. Bleeding of concrete may be due to
1. excess of water
2. too much finishing
3. coarse aggregates
 (a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1,2 and 3



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