Concrete Technology - Dec 2014

Civil Engineering (Semester 4)

TOTAL MARKS:
TOTAL TIME: HOURS

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1 Design a concrete mix for M30 grade of concrete for severe exposure condition for RCC work as per IS:10262-1982 for 1 bag of cement for the following data.
Maximum size of aggregate (Angular) : 20 mm
Water-Cement ratio : 0.48
Specific gravity of Cement : 3.10
Specific gravity of Fine Aggregate : 2.6
Specific gravity of Coarse aggregate : 2.65
Water Absorption of Fine Aggregate : Nil
Water Absorption of Coarse aggregate : 0.50%
Free surface moisture on Fine Aggregate: 1%
Compaction Factor :0.85 Targeted Slump: 50 mm
Sand Zone: III Take standard deviation: 5
and Tolerance factor: 1.65
Use Table 1 to 4.(14 marks)

Answer following questions in short.

2 (a) 1 Why gypsum is added during the process of manufacturing of Cement?(1 marks) 2 (a) 2 What is the effect of size of aggregate on workability?(1 marks) 2 (a) 3 What is the effect of Water cement ratio on compressive strength of Concrete?(1 marks) 2 (a) 4 Define fineness modulus.(1 marks) 2 (a) 5 Give the value of initial and final setting time for OPC cement.(1 marks) 2 (a) 6 What is the allowable maximum w/c ratio for RCC?(1 marks) 2 (a) 7 Which property of cement is measured by Soundness test?(1 marks) 2 (b) Enlist different types of Chemical and Mineral admixture. Explain any one of each in detail.(7 marks) 2 (c) Explain dry process for manufacturing of cement.(7 marks) 3 (a) Define workability. Enlist the test for measurement of workability. Explain compaction factor test.(7 marks) 3 (b) What is NDT? Explain ultrasonic pulse velocity test in detail.(7 marks) 3 (c) Define standard consistency of cement. Explain test for compressive strength of Cement.(7 marks) 3 (d) Enlist the test performed on hardened concrete specimen. Explain any one in Detail.(7 marks) 4 (a) Write short note on segregation and bleeding.(7 marks) 4 (b) Explain factors affecting hot weather concreting.(7 marks) 4 (c) Write short note on permeability of concrete. Explain factors affecting permeability of concrete.(7 marks) 4 (d) Write short note on underwater concreting.(7 marks) 5 (a) Write short note on pumped concrete.(7 marks) 5 (b) Write short note on alkali aggregate reaction and sulfate attack.(7 marks) 5 (c) Enlist different repairing materials. Explain repairing techniques for concrete.(7 marks) 5 (d) Define flakiness and elongation index of aggregate. Explain aggregate impact Test(7 marks)