Download PTU B-Tech CE 2020 Dec 4th Sem 77644 Concrete Technology Question Paper

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Roll No. Total No. of Pages : 02
Total No. of Questions : 18

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B.Tech. (Civil Engineering) (2018 Batch) (Sem.-4)
CONCRETE TECHNOLOGY
Subject Code : BTCE-401-18
M.Code : 77644
Time : 3 Hrs. Max. Marks : 60

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INSTRUCTIONS TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.

SECTION-A

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Write briefly :

1. Why Accelerators are added to concrete?
2. What is High Weight Concrete?
3. What do you mean by segregation?
4. Name the non-destructive methods to test concrete.

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5. What is Polymer Concrete?
6. What do you understand by grading of aggregates?
7. List out the variables-in proportioning of concrete mix.
8. What kinds of stump observed in slump cone test.
9. List out the effects of cold weather on concrete.

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10. What is the significance of durability?

SECTION-B

11. What do you mean by alkali aggregate reaction?
12. Discuss the properties of high weight concrete and its applications.
13. Explain the factors influencing the strength of concrete?

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14. What are Chemical Admixtures? Explain any two of them.
15. Compare the physical properties of 33, 43 and 53 grades of concrete.

SECTION-C

16. How do you determine the fresh concrete properties? Explain any two in detail?
17. What is the effect of water cement ratio on strength and durability of concrete?

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18. Design a concrete mix for M30 grade of concrete using F type fly ash. Adopt BIS method with the following data :
    1. Type of cement - OPC 43 grades
    2. Maximum size of aggregate - 20 mm
    3. Exposure condition - Severe (RCC)
    4. Workability - 100 mm slump
    5. Maximum cement content - 320kg/m³

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    6. Maximum W/C - 0.46
    7. Method of placing concrete - Pumping
    8. Degree of supervision - Good
    9. Type of aggregate - Crushed angular aggregate
    10. Super plasticizer will be used

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    11. Specific gravity of coarse aggregate - 2.80
    12. Specific gravity of fine aggregate - 2.70
    13. Specific gravity of fly ash - 2.2
    14. Water absorption : Coarse aggregates.- 0.5%, Fine aggregates.-Nil
    Grading of coarse aggregates is conforming to Table 2 of IS 383 and grading of Fine aggregate is falling in zone L.

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NOTE : Disclosure of Identity by writing Mobile No. or Marking of passing request on any paper of Answer Sheet will lead to UMC against the Student.

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