Concrete Technology - May 2015

Civil Engineering (Semester 4)

TOTAL MARKS:
TOTAL TIME: HOURS

1 (a) Fill in the blanks :

(i) The cement becomes useless if its absorbed moisture exceeds ____% (3, 4, 5)
(ii) The individual variation in compressive strength results should not exceed ______ of the average. (5%, 15%, 20%).
(iii) To prevent segregation, the maximum height for placing concrete is ______cm. ( 100, 125,150).(3 marks) 1 (b) Describe the wet process of manufacturing of cement.(4 marks) 1 (c) What is soundness of cement? Explain soundness test of cement.(7 marks) 2 (a) Mention acceptance criteria for Mix design. The following data represents the strength of individual cubes of M25 grade of concrete. 24, 26, 24, 21, 22, 23, 27, 28, 30, 21 N/mm². Calculate mean strength, Standard deviation and co-efficient of Variance.(7 marks)

Answer any one question from Q2 (b) & Q2 (c)

2 (b) State factors affecting Compressive strength of concrete and explain any one in detail.(7 marks) 2 (c) Define Creep. Explain factors affecting creep of concrete.(7 marks)

Answer any two question from Q3 (a), (b) & Q3 (c), (d)

3 (a) Explain causes of Corrosion and Remedial measures.(7 marks) 3 (b) (i) Explain Sulphate Attack on concrete.(4 marks) 3 (b) (ii) Define Shrinkage. Explain Plastic shrinkage.(3 marks) 3 (c) Explain factors affecting Durability.(7 marks) 3 (d) (i) Explain Sulphate Attack on concrete.(4 marks) 3 (d) (ii) Give advantages of Quality control.(3 marks)

Answer any two question from Q4 (a), (b) & Q4 (c), (b)

4 (a) (i) State the major Compounds of OPC and importance of them.(4 marks) 4 (a) (ii) Write short note on Segregation.(3 marks) 4 (b) Explain "Alkali Aggregate Reaction". Explain factors promoting it.(7 marks) 4 (c) (i) State any four different types of cement with its use.(4 marks) 4 (c) (ii) Write short note on Bleeding.(3 marks) 4 (d) Explain Aggregate Crushing value test on Coarse Aggregate.(7 marks)

Answer any two question from Q5(a), (b) & Q5 (c), (d)

5 (a) Write short note on Self Compacting Concrete.(7 marks) 5 (b) Define workability. State different methods of it. Describe any one in detail.(7 marks) 5 (c) (i) Explain Pre-packed Concrete.(4 marks) 5 (c) (ii) List out various application of Shotcrete.(3 marks) 5 (d) List various Non-Destructive tests for assessment of strength of concrete. Explain Rebound Hammer test.(7 marks)