Building Materials, Third Edition
QHP f
2w
- Describe briefly the following:
(a) Vee-Bee Test
(b) Factors affecting durability of concrete
(c) Rheological properties of concrete
(d) Properties of cement concrete in green and hardened state
- Write notes on following:
(a) Segregation (b) Bleeding
(c) Laitance (d) Sulphate attack
- (a) What is meant by M20 grade concrete?
(b) Describe compacting factor test.
(c) What is crazing?
- What concrete mix will you recommend in the following situations:
(a) Beams (b) Columns
(c) Slabs (d) Foundation of a residential building
(e) Water tanks
- (a) Define creep. What are its advantages and disadvantages?
(b) What is shrinkage? What factors promote shrinkage? What precautions will you
take to reduce it?
- State the value of slump and compacting factor you will recommend for following works:
(a) Beams (b) Slabs
(c) Foundations (d) Retaining walls
(e) Pavements
- (a) How is consistency different from workability?
(b) What are the effects ‘of over compaction’ and under compaction of concrete?
(c) How will you judge that compaction is complete?
- (a) What are the methods of testing the properties of green concrete.
(b) Describe the methods used to test the hardened concrete?
- Write short notes on following:
(a) Concrete mixers (b) Vibrators
(c) Pumping of concrete (d) Accelerated curing
- (a) What are the various methods of transporting concrete?
(b) Discuss briefly the factors affecting the workability of concrete.
- (a) What are the various methods of mixing concrete? Give their relative merits and
demerits.
(b) Discuss briefly the various methods of placing concrete. What precautions should be
exercised during placing?
- What are admixtures? Describe the effects of following admixtures on cement concrete
with three examples of each
(a) Retardees (b) Accelerators
(c) Water proofers
- Discuss the effect of following admixtures.
(a) Calcium chloride (b) Sugar
(c) Gypsum (d) Calcium lingo sulphonate
(e) Sodium hydroxide
- What are superplasticizers? How are these helpful in modifying the properties of concrete?
