CE 237 — CONCRETE AND CONSTRUCTION TECHNOLOGY

PART A — (10 ? 2 = 20 marks)
1. How do you classify concrete based on compressive strength?
2. Under what conditions, the use of sulphate resisting cement is recommended?
3. List any four controlling methods of sulphate attack.
4. Write short notes on soundness of cement.
5. What is shoring? Under what circumstances, you would go for shoring?
6. What are the requirements of a good plaster?
7. Compare English bond and Flemish Bond in brick masonry.
8. Define (a) Repair and (b) Rehabilitation.
9. List any four operations that can be performed by a bull dozer.
10. What are the factors you consider while selecting a stone crushing equipment?
PART B — (5 ? 16 = 80 marks)
11. Design the concrete mix to suit the following data as per I.S. code method.
(The necessary graphs and tables are given)
Characteristic strength of concrete at 28 days = 20 N/mm2
Type of exposure = Moderate
Maximum size of aggregate = 20 mm
Workability = 0.95 compacting factor
Degree of quality control = Good
Specific gravity of cement = 3.13
Specific gravity of fine aggregate = 2.65
Specific gravity of coarse aggregate = 2.65
Water absorption of coarse aggregate = 0.40%
Water absorption of fine aggregate = 0.9%
Free surface moisture of fine aggregate = 1.5%
Sand conforms to = Zone III/IS 383–1979
12. (a) Write short notes on :
(i) Rapid hardening cement. (4)
(ii) Sulphate Resisting cement. (4)
(iii) Blast furnace cement. (4)
(iv) Quick setting cement. (4)
Or
(b) Clearly explain the following tests on hardened concrete :
(i) Rebound hammer test. (8)
(ii) Ultrasonic Pulse velocity method of test. (8)
13. (a) (i) What is scaffolding? What are the component parts? (6)
(ii) Clearly explain Double scaffolding and needle scaffolding. (10)
Or
(b) (i) What are the essential requirements of a floor? (6)
(ii) What are the factors which affect the choice of a flooring material?
Explain each one of them. (10)
14. (a) (i) Draw a flow chart for assessment procedure for a damaged
structure. (6)
(ii) Explain clearly the causes of deterioration of concrete structures.
(10)
Or
(b) (i) What is fire load? How does Indian standard grade the fire loads? (6)
(ii) Explain clearly the fire resisting properties of the following building materials :
(1) Stone (2) Bricks
(3) Concrete (4) Steel
(5) Glass. (10)
15. (a) (i) What is the operating principle of a power shovel? (5)
(ii) What is maximum depth of cut of a power shovel? (3)
(iii) What are the factors which affect the output of a power shovel? (8)
Or
(b) (i) What are the essential parts of a belt conveyor? (4)
(ii) With sketches, explain the principle of operation of a belt conveyor.
(8)
(iii) List the advantages and disadvantages of a belt conveyor. (4)