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Concrete Composites & Precast Concrete (Elective I) (April 2010)

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Total No. of Questions : 10] [Total No. of Pages : 2 [3764] - 1011 P 1598 B.E. (Civil) CONCRETE COMPOSITES & PRECAST CONCRETE (Elective - I) (1997 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in two separate answer books. 2) Solve any three questions from each section. 3) Neat diagrams must be drawn wherever necessary. 4) Assume data if required. SECTION - I Q1) a) b) c) What are important parameters while making good concrete? Elaborate each point and discuss how each parameter affects quality of concrete. [8] Enlist the types of cement stating the advantage and application of each. [8] Enlist the tests to be carried out for evaluation of quality of concrete. [2] Q2) a) b) c) Enlist different concreting techniques & its suitable applications. What are admixtures, what are its advantages & optimal dosage? What are types of admixtures? Q3) a) Explain with neat sketch the advances in mixing, handling, placing and compaction of fresh concrete. [8] Explain advantages and disadvantages of ready mix concrete. [4] Explain with example or application where pumping of concrete is required. [4] b) c) Q4) a) b) c) [6] [7] [3] What are factors affecting shrinkage of concrete, modulus of elasticity [6] of concrete? Explain relation between modulus of elasticity and strength of concrete. [6] Explain creep in concrete and how it can be measured. [4] P.T.O. Q5) a) b) c) Explain accelerated curing of concrete. [4] Explain how flexural strength of concrete, can be tested in laboratory. [6] Explain ultrasonic - pulse test on concrete. [6] SECTION - II Q6) Design the concrete mix for following data a) Air field pavement concrete for 25 N/mm2 strength at 28 days is to be designed. b) The laboratory standard deviation of concrete strength is 4 Mpa. c) The specific gravity of C.A. = 2.68 & dry rodded density is 16 KN/m3 Max. size of C.A. = 40 mm. d) Specific gravity of F.A. = 2.64 its fineness modulus = 2.8. e) A slump of 25 mm be maintained. f) Use O.P.C. [16] Q7) Write short note on any four : a) Polymer concrete composite. b) Fiber reinforced concrete. c) Glass fiber reinforced concrete. d) Light weight concrete. e) High density concrete. f) Ferro - Cement. [16] Q8) a) b) c) Explain precast railway sleepers with respect to its manufacturing. [4] Explain analysis and design of railway sleepers. [8] Explain precast units used in precast construction. [4] Q9) a) Explain different types of joints in precast construction, draw neat sketches of each and explain. [8] Explain erection and assembley techniques of precast units at site. [8] b) Q10)Write short note on : a) Rehabilitation of damaged / old concrete. b) Re-cycling of concrete. c) Non-distructive testing of concrete using hammer. [3764] - 1011 -2- [6] [6] [6]

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Additional Info : April 2010 Examination - Concrete Composites & Precast Concrete (Elective I) (1997 Course)
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