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Advanced Concrete Technology (Elective II) (April 2010)

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Total No. of Questions : 12] P1465 [Total No. of Pages : 4 [3764]-112 B.E. (Civil) ADVANCED CONCRETE TECHNOLOGY (2003 Course) (Elective - II) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Solve Q. 1 or Q. 2, Q. 3 or Q. 4, Q. 5 or Q. 6 from Section I and Q. 7 or Q. 8, Q. 9 or Q. 10, Q. 11 or Q. 12 for Section II. 2) Answers to the two sections must be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of pocket calculator is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) Give the historical background of development of cementing material.[6] b) State the Bougues equation for the percentage of main compound of composition of Portland cement. [6] c) Explain with charts, the relation between compressive strength of concrete and fineness of cement. [6] OR Q2) a) Determine the amount of water to be added in the mixture of cement and sand, to test ordinary Portland cement weighing 1 kg, for consistency test, soundness test, initial and final setting time & compressive strength. [6] b) Explain the importance of grading curve of aggregates in Civil Engineering. [6] c) Enlist the different properties of fresh concrete. Explain any one of them.[6] Q3) a) Explain and differentiate vacuum concrete and no fine concrete. [8] b) Differentiate shotcreting and guniting. [4] c) Explain jet cement concrete. [4] OR P.T.O. Q4) a) Explain the plasticizer and super-plasticizers with reference to following. [8] i) Their nature. ii) Its effect on compressive stung of concrete. iii) Its effect on workability of concrete. iv) Its dosage to be added in concrete. b) Explain the different tests to be carried to determine the leakages in [4] hardened concrete. c) What is carbonation of concrete? Explain rate of carbonation and factors affecting it. [4] Q5) a) Design a concrete mix suitable for use in the construction of the dam exposed to severe atmosphere. Ordinary Portland cement is used and course aggregate available is from 5 to 150 mm. other data is as follows: 28 days cylindrical compressive strength = 20 kN/m3 Dry rodded weight of course aggregate = 180 kN/m3 Fine-ness modulus of sand = 2.8 Slum required = 25 to 50 mm Specific gravity of cement, course aggregate and sand is 3.15, 2.7 and 2.65 respectively. [8] b) Describe high performance concrete. [4] c) Explain the infrared thermography test of non destructive testing. [4] OR Q6) a) Design a M45 Concrete Mix by any method for following data. Characteristic strength of concrete after 28 days is 45 MPa and slump of 10-30 mm. type of cement is ordinary Portland cement. Fine aggregate is river sand confirms to Zone-II. Course aggregate is of size 20 mm and confirms IS 383 requirements. Specific gravity of cement, sand and course aggregates is 3.15, 2.63 and 2.61 respectively. Type of exposure is mild, degree of quality is very good. [8] b) Explain the steam curing. [4] c) Explain effect of sea water on concrete. Explain concrete with Ground Granulated Blast Furnace Slag. [4] [3764]-112 -2- SECTION - II Q7) a) Draw and explain uniaxial tensile stress-strain curves for various cement based composites. [6] b) Explain the tensile behavior of fiber cement composites. [6] c) Explain the importance of fiber orientation and aspect ratio in FRC. [6] OR Q8) a) Explain the major parameter affecting fiber interaction with homogeneous cracked matrix with axial stress and shear stress. [6] b) Explain procedure how to find the fracture resistance of concrete. Also explain how to improve it. [6] c) Enlist and explain in brief the various types of natural and artificial fibers in a sequence of they got application in field. [6] Q9) a) State values of the following properties of Glass fiber. [6] Specific gravity, Tensile strength, Modulus of elasticity, strain at break. b) What is SIFCON material? Write about its physical properties. [4] c) Enlist the applications of Glass and Polymer mixed fiber reinforced concrete. [6] OR Q10) a) Explain the test procedure to evaluate the contribution of steel fiber to drying shrinkage and crack reduction. [6] b) Explain the techniques for toughness measurement for FRC. [4] c) Explain the compliance mechanics. [6] Q11) a) Explain the details of industrial Precast concrete poles with reference to following : [12] i) A material required along with specification. ii) Analysis and design principals with silent feature. iii) Manufacturing method with flow chart. iv) Testing methodology required. v) Quality control. b) What are the different techniques to improve the durability of SFRC?[4] OR [3764]-112 -3- Q 12) a) Prepare a technical visit report which you have visited to industrial precast production unit with respect to : [12] i) Material required with specification. ii) Analysis and design principles involved. iii) Manufacturing technology. iv) Testing method employed. b) Explain the shrinkage behavior of light weight FRC. rrrr [3764]-112 -4- [4]

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Additional Info : April 2010 Examination - Advanced Concrete Technology (Elective II) (2003 Course)
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