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Concrete Technology

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Concrete Technology
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Code No: R31013

R10

Set No: 1

III B.Tech. I Semester Regular Examinations, November/December - 2012 CONCRETE TECHNOLOGY (Civil Engineering) Time: 3 Hours Max Marks: 75 Answer any FIVE Questions All Questions carry equal marks ***** Assume missing data suitably 1. (a) Describe the oxide composition of Ordinary Portland Cement. (b) What are the main compounds into which the above oxides will transform in the process of fusion?. 2. (a) Explain the phenomenon of bulking of fine aggregates and its practical significance in mix proportioning. (b) Explain Alkali-aggregate reaction and its effect on the final product of concrete. 3. (a) List out various field and laboratory tests that are conducted to assess the properties of fresh concrete. (b) Explain Compaction Factor test describing the test equipment. Compare the Compaction factor values to Slump of the concrete for different workability. 4. (a) Explain Plowman’s procedure for assessment of maturity of concrete. (b) The strength of a sample of fully matured concrete is found to be 40Mpa. Find the strength of identical concrete at age of 7 days when cured at an average temperature during daytime at 180 and night time at 90 centigrade. The plowman’s constants A and B are 32 and 54 respectively. 5. (a) What are the factors affecting the strength of concrete? (b) Explain the procedure for measuring split tensile strength. 6. (a) Explain phenomenon of creep in concrete. Explain measurement of creep in creep with loading diagram. (b) Explain various factors influencing creep in concrete. 7. (a) Explain with neat diagram non-destructive evaluation of concrete using Pulse Velocity Method. (b) What are the techniques of measuring pulse velocity through concrete and factors affecting the measurement of pulse velocity? 8. (a) Explain significance of concrete mix design. What are various factors to be kept in mind while designing a concrete mix? (b)
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