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Advanced Goncrete Technology Time: 3 hrs.

Max. Marks:100

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Answer FIVE full qaestions, selecting at least TWO qaestionsfrom each part. 2. Missing data may be saitably assumed 3. Use of IS: 10262 - 2009 is permitted

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Explain the factors affecting the mix design of concretes. (05 Marks) Design a concrete mix of Mzs grade for the following data: Max size of aggregate * 20 mm; Crushed angular Min/max cement content - 30Ol45O kg/m3; Max WC * 0.5; Exposure condition - Moderate; Work ability - 100 mm slump; Method of placing - pumping; Quality control - good; Type of chen:ical admixture - Super plasticizer fSpecific gravity - 1.T41. Assume 25.a/a replacement of cement by fly ash. Test data for materials: i) Cerrient - OPC 43 grade IS 8112. ii). Specific gravity of cement - 3.15 iii) Fly ash-20o/o Cementations material iv) Specific gravity of fly ash_ 2.20 v) Specific gravity of coarse aggregate -2.60 vi) Specific gravity of flrne aggregate - 2.65 [belongs to zone II] Assume any other data suitably. (15 Marks)

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Explain the rnechanism of 'deflocculation' of cernent particles by super plasticizers with neat sketches. (07 Marks) What is optimum dosage of super plasticizer? How do you determine the optirnum dosage of super plasticizer? (07 Marks) What are mineral admixtures? Explain briefly, Silica flume ii) G.G.B.S. iii) Fly ash. (06 Marks)

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Enumerate the importance of Bogue's,compounds in ordinary port land cement. (06 Marks) Explain briefly rheology of concrete. What are the factors affecting the rheology of concrete? (07 Marks) What are the factors affecting strength and elasticity of concrete? (07 Marks)

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Explain the influence of w/c ratio and age on permeability of concrete. (07 Marks) Discuss in brief alkali aggregate reaction. What precautions are necessary to minimize?

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What is sulphate attack? Explain briefly the methods of controiling sulphate attack.

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Concrete' [HPC]? What aro",,tiie applications

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High Performance Concrete? (06 Marks) Discuss in briefthe properties of High performance concrete in fresh and hardened state. (08 Marks) Explain the following: Tests on hardened concrete. Rebound Flamrner Test [NDT]. Pulse Velocity Test tI.,fDTl.

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What are the different types of fibres used in concrete? what factors effecting properties of fibre reinforced "'.,,6[#"r.ri What is aspect ratio? How does it influence strength and toughness of FRC ",, (04 Marks) what is Ferro cement? List the various applicatioirs of Ferroiement. (08 Marks)

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a. what is R.M.c? Exprain briefly uor#ffi.M.c. b. Exptain shorr crete and under water concreting. c' what is self compactngconcrete? what are tie advantages of self compacting

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(08 Marks) (06 Marks) (06 Marks)