NSCET-QUESTION BANK

Nadar Saraswathi College of Engineering and Technology, Vadapudupatti, Theni - 625 531

(Approved by AICTE, New Delhi and Affiliated to AnnaUniversity, Chennai)

Format No.NAC/TLP-07a.12

Rev. No. 02Date 12-11-2015Total Pages 01

Question Bank for the Units – I to V

SEM-6 6th Semester – B.E. / B.Tech.

BR-103 Department of Civil Engineering

CE6002

CONCRETE TECHNOLOGY

Part-A (10 x 2 = 20 Marks)

UNIT – I

No Question Level Competence Mark

1.1 What is meant workability? And What are the important parameters of workability?

L2 Comprehension 2

1.2 What is meant proportioning? And State methods of proportioning of concrete mixes.

L2 Comprehension2

1.3 What are the factors affecting workability? L1 Knowledge 2

1.4 Tell the chemical composition and components are present in cement.

L1 Knowledge 2

1.5 What is meant finess in cement? L2 Comprehension 2

1.6 What is meant hydration of cement? L2 Comprehension 2

1.7 What are the tests are conducted to find quality of cement?

L1 Knowledge 2

1.8 State the properties of cement. L2 Comprehension 2

2.1 What are the tests are conducted to find quality of aggregate?

L1 Knowledge 2

2.2 What are the tests adopted to test the properties of cement in field?

L1 Knowledge 2

2.3 What is mean mortar? State types of mortars. L1 Knowledge 2

2.4 Explain segregation. What are the methods are adopted to avoid segregations of concrete?

L1 Knowledge 2

2.5 What are the factors affecting workability? L1 Knowledge 2

2.6 What is meant by grading of aggregates? L5 Evaluation 2

2.7 What are the important properties of water used in concrete?

L1 Knowledge 2

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2.8 State types of cement. Explain anyone. L1 Knowledge 2

Part – B ( 5 x 16 = 80 Marks) or Part – B ( 5 x 13 = 65 Marks)

UNIT- I

11.a-1 What is meant Cement? Explain with the help of a neat sketch, the wet process and wet process of manufacture ofordinary cement.

L2 Comprehension(13)

11.a-2 Illustrate and explain various types of cement indicating their use for different applications.

L1 Knowledge (13)

11.a-3 List the various tests conducted on coarse aggregate indicating the property being tested.

L2 Comprehension (13)

11.a-4

What is meant Grading of aggregate? And explain the following,(i) Uniform grading (ii) Gap grading (iii) Continuous grading.

L4 Analysis (4)

(3)(3)(3)

11.b-1 What are the effects of the shape and texture of aggregates on the strength and workability of concrete and What is the effect of the maximum size of aggregate on concrete strength?

L2 Comprehension (7)

(6)

11.b-2 (i) Describe the importance of the quality of water used for concreting? (ii) List the various types of cement indicating their use for different Applications.

L1 Knowledge (3)

(10)

11.b-3

Explain in detail about the following tests conducted to determine mechanical properties of Aggregate, i) Crushing value ii) Impact value iii) Abrasion value of aggregates.

L2 Comprehension (5)

(4)

(4)

11.b-4 What are the important chemical tests conducted on cement to determine its quality ?

L1 Knowledge (13)

Part – C ( 1 x 15 = 15 Marks)

UNIT-I

16 .a-1 Explain briefly the role played by gypsum in thehydration reaction of cement.

L1 Knowledge (15)

16 .a-2 Explain the test involved in cement as per ACI L4 Analysis (15)

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(OR)

16.b-1 Discuss about alkali aggregate reaction in detail. L5 Evaluation (15)

16.b-2 Explain the test involved in aggregate as per IS L4 Analysis (15)

UNIT – II

Part-A (10 x 2 = 20 Marks)

No Question Level Competence Mark

3.1 What is meant admixtures? What is the necessity of use admixture?

L1 Knowledge 2

3.2 List types of Admixtures? L1 Knowledge 2

3.3 Define plasticizers and Super plasticizers. L1 Knowledge 2

3.4 What is the purpose of adding admixture in concrete? And what are chemical admixtures?

L5 Evaluation 2

3.5 What is mean mineral admixtures? And what are theadmixtures available in India?

L1 Knowledge2

3.6 Describe the term metakaoline. L1 Knowledge 2

3.7 Differentiate accelerators and retarders. L5 Evaluation 2

4.1 What is mean retarders? L3 Application 2

4.2 Define water repelling agent. L1 Knowledge 2

4.3 Explain about Air entraining agents. L1 Knowledge 2

4.4 Write about artificial pozzolanas? L1 Knowledge 2

4.5 Describe water proofers. L1 Knowledge 2

4.6 What is meant GGBFS? And what are its uses? L1 Knowledge 2

4.7 What are purposes of providing DPC in buildings? L1 Knowledge 2

Part – B ( 5 x 16 = 80 Marks) or Part – B ( 5 x 13 = 65 Marks)

UNIT- II

12.a-1 (i) What are the important purposes for which admixtures are used? (ii) List the general classification of concrete chemicals according to their effects?

L1 Knowledge (13)

12.a-2 Summarize the admixtures in detail. L1 Knowledge (13)

12.a-3 Define is super plasticizers? What are the classifications of super plasticizers and state its applications.

L3 Application (13)

12.a-4 (i) Why are chloride based accelerators not used in pre- L3 Application (13)

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stressed concrete Structures? (ii)How are mineral admixtures classified?

12.b-1 (i)Mention some of the construction chemicals. (ii)Write short notes on retarders.

L3 Application (13)

12.b-2 Explain in details about the types of mineral admixtures. L1 Knowledge (13)

12.b-3 Explain in detail about plasticizers, its mechanism and benefits.

L3 Application (13)

12.b-4 Summarize any four pozzolanic admixtures. L3 Application (13)

Part – C ( 1 x 15 = 15 Marks)

UNIT-II

16 .a-1 Distinguish between pozzolanic and or cementitious admixtures.

L1 Knowledge (15)

16 .a-2 What are the different chemicals used to obtained the desired colours on a concrete surface?

L2 Comprehension (15)

(OR)

16.b-1 Compare plasticizer and supper plasticizer L1 Knowledge (15)

16.b-2 Summarize any four pozzolanic admixtures. L2 Comprehension (15)

UNIT – III

Part-A (10 x 2 = 20 Marks)

No Question Level Competence Mark

5.1 What is meant Mix design? And What is the objectives of concrete mix design

L1 Knowledge 2

5.2 Describe the principle of mix proportioning. L1 Knowledge 2

5.3 What are various methods of proportioning? L1 Knowledge 2

5.4 What are the factors are considered for mix design. L1 Knowledge 2

5.5 Explain the methods concrete mix design for ordinary concrete?

L2 Comprehension 2

5.6 Describe requirements of concrete mix design? L1 Knowledge 2

5.7 Classify various factors affecting proportioning of concrete mixes?

L2 Comprehension 2

5.8 State the advantages of Design mix. L1 Knowledge 2

6.1 What are the operations involved statistical quality control?

L2 Comprehension 2

6.2 Differentiate average design strength and specified L5 Evaluation 2

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minimum strength

6.3 State the disadvantages of nominal mix. L1 Knowledge 2

6.4 Describe the techniques involved in mix design? L5 Evaluation 2

6.5 Compare the advantages of a design mix to the normal mix

L4 Analysis 2

6.6 Evaluate the physical properties of materials required to mix design.

L5 Evaluation 2

6.7 Write the essential features of grading of concrete. L3 Application 2

6.8 Explain about data used for ACI. L1 Knowledge 2

Part – B ( 5 x 16 = 80 Marks) or Part – B ( 5 x 13 = 65 Marks)

UNIT- III

13.a-1 Describe the procedure step by step procedure of ACI method of mix design

L4 Analysis (13)

13.a-2 What are the factors affecting proportioning of a concrete mix? Discuss each in detail.

L5 Evaluation (13)

13.a-3 Tell about parameters to be considered while designing a concrete.

L1 Knowledge (13)

13.a-4 Differentiate between nominal mix and design mix. L1 Knowledge (13)

13.a-5 Discuss the various methods of proportioning. L1 Knowledge (13)

13.b-1 Describe in detail about the procedure for IS method of mix design.

L4 Analysis (13)

13.b-2 Design a concrete mix which is required to have a specified mean strength of 30 Mpa at 28 days. The presence of reinforcement requires a slump of 75mm and a maximum size of aggregate of 10mm. The aggregate are of normal weight and their grading conform to the approximate standard with a fineness modulus of 2.8. Assume negligible absorption and moisture content, bulk density of coarse aggregate 1600 Kg/m3 and extreme exposure conditions. Use ACI method.

L4 Analysis

(13)

13.b-3 Compare ACI and IS method of concrete mix design. L2 Comprehension (13)

13.b-4 Design a concrete mix for the following requirements using IS method. Also find the mix proportions by weightand by volume. M40 grade , OPC cement, sp gravity – 3.15, bulk density – 1440kg/m3, sand – grading zone I , sp

L4 Analysis (13)

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NSCET-QUESTION BANK

gravity – 2.65, bulk density – 1610kg/m3 Coarse aggregate – 10mm angular, sp gravity – 2.66, bulk density– 1580kg/m3 Degree of workability – 0.85 compacting factor, quality control – very good

13.b-5 Design a concrete mix for construction of an elevated water tank. The specified design strength of concrete is 30MPa at 28 days measured on standard cylinders. Standarddeviation can be taken as 4 MPa. The specific gravity of FA and CA are 2.65 and 2.7. The dry rodded bulk density of CA is 1600 kg/m3 and fineness Modulus of FA IS 2.80. A slump of 50mm is necessary moisture content of sand is2% and water absorption of CA is 1%.

L4 Analysis

(13)

Part – C ( 1 x 15 = 15 Marks)

UNIT-III

16 .a-1 Explain with flow chart the procedure involved in tunneling techniques.

L4 Analysis (15)

16 .a-2 (i)Write a note on defects of the currently used method ofmix proportioning in India? (ii) How will you account for the moisture present in sand while mix proportioning.

L5 Evaluation(8)(7)

16 .a-3 Distinguish between the term sampling and acceptance criteria in proportioning of concrete mix.

L2 Comprehension (15)

(OR)

16.b-1 Design a concrete mix by BIS method with the following data Characteristics compressive strength = 35N/mm2 Maximum size of aggregate = 20mm (angular) Fine aggregates confirm to grading zone II Degree of workability = 0.80 Degree of quality control = Good, Type of exposure = Mild Specific gravity of cement = 3.14 Specific gravity of fine aggregate = 2.58 Water absorption (i) Coarse aggregate = 1.9% (ii) Fine aggregate Water cement ratio = 0.48 Assume any other data if necessary. Also calculate the quantity of cement, sand, coarse aggregate and water required per cubic metre of concrete.

L4 Analysis

(15)

16.b-2 Design a concrete mix for construction of an elevated water tank. The specified design strength of concrete is 30mpa at 28 days measured on standard cylinders. Standard deviation can be taken as 4mpa. The specific gravity of FA and CA are 2.65 and 2.7 respectively. The dry rodded bulk density of CA is 1600 kg/m3 and fineness

L4 Analysis (15)

DEPARTMENT OF CIVIL ENGINEERING

NSCET-QUESTION BANK

modulus of FA is 2.8. opc used A slump of 50mm is necessary. CA is found to be absorptive to the extent of 1% and free surface moisture in sand is found to be 2%. Assume any other data

16.b-3 Design a concrete mix for M20 concrete for the followingdata by ACI method. Specific gravity of ordinary Portland cement = 3.15 Specific gravity of fine aggregate = 2.65 Specific gravity of coarse aggregate = 2.70 Standard deviation = 4 N/mm2 Dry rodded bulk density of CA=1600kg/m3 Fineness modulus = 2.80 Slump=50mm Assume any other data suitably, if necessary

L4 Analysis

(15)

UNIT – IV

Part-A (10 x 2 = 20 Marks)

No Question Level Competence Mark

7.1 Define workability. What are the factors affecting workability?

L1 Knowledge 2

7.2 State the quality of concrete? L1 Knowledge 2

7.3 What are the important parameters of workability? L5 Evaluation 2

7.4 Define the term compacting factor. L2 Comprehension 2

7.5 Explain segregation. L2 Comprehension 2

7.6 What are the various stages are in manufacturing of concrete?

L2 Comprehension 2

7.7 Classify the methods for transportation of concrete. L3 Application 2

7.8 Classify the methods are adopted for compacting the Concrete.

L1 Knowledge 2

8.1 State the methods used for curing. L1 Knowledge 2

8.2 Define the term NDT and List out the NDT test? L3 Application 2

8.3 What are the factors influencing cracks in concrete? L2 Comprehension 2

8.4 Define the term Bleeding? L5 Evaluation 2

8.5 What is meant creep in concrete? L1 Knowledge 2

8.6 Evaluate the reasons for shrinkage of concrete. L5 Evaluation 2

8.7 Explain about dynamic modulus. L2 Comprehension 2

8.8 Write the different tests for workability of concrete. L1 Knowledge 2

Part – B ( 5 x 16 = 80 Marks) or Part – B ( 5 x 13 = 65 Marks)

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NSCET-QUESTION BANK

UNIT- IV

14.a-1 What are the various factors which affecting the workability of concrete? Explain.

L5 Evaluation (13)

14.a-2 Discuss the following tests for concrete: (i) Flow test (ii) slump test

L2 Comprehension (6)(7)

14.a-3 Tell in detail about the practical significance of stress-strain curve for concrete?

L1 Knowledge (13)

14.a-4 Summarize and explain the methods used for testing Hardened concrete?

L3 Application (13)

14.a-5 (i)Explain Durability of concrete?

(ii)Factor affecting durability of concrete?

L2 Comprehension (6)(7)

14.b-1 Compare the relative merits and demerits of various workability tests.

L6 Synthesis (13)

14.b-2 Explain Under what circumstances is concrete subjected to fatigue stresses?

L5 Evaluation (13)

14.b-3 Define the term workability. What are the various tests conducted to determine the Workability of concrete and explain them.

L2 Comprehension(13)

14.b-4 Write short notes on (i) Elasticity of concrete (ii) Shrinkage (iii) Creep

L2 Comprehension (4)(5)(4)

Part – C ( 1 x 15 = 15 Marks)

UNIT-IV

16 .a-1 What are the two non-destructive tests commonly used toassess the compressive strength? Explain any one method.

L1 Knowledge(15)

16 .a-2 What is mean cuing? Describe the importance of curing? When should it be commenced? For how long should it be continued?

L3 Application(15)

(OR)

16.b-1 Explain the phenomenon of shrinkage of concrete. L2 Comprehension (15)

16.b-2 Discuss the beneficial and harmful effects of creep of concrete?

L5 Evaluation (15)

UNIT – V

Part-A (10 x 2 = 20 Marks)

No Question Level Competence Mark

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9.1 State the advantages of geopolymer concrete. L1 Knowledge 2

9.2 What is mean High performance concrete? L2 Comprehension 2

9.3 What is Polymer Concrete? State its advantages L1 Knowledge 2

9.4 What are the factors affecting the properties of fibre reinforced concrete?

L3 Application 2

9.5 What are the special methods of making high strength concrete?

L2 Comprehension 2

9.6 Explain pumice. L1 Knowledge 2

9.7 What are the advantages of fibre reinforced concrete? L3 Application 2

9.8 Classify the types of artificial light weight aggregate L2 Comprehension 2

10.1 What are properties of polymer impregnated concrete? L2 Comprehension 2

10.2 Classify the different methods producing light weight concrete.

L2 Comprehension 2

10.3 Differentiate between high performance concrete and geopolymer concrete.

L2 Comprehension 2

10.4 Explain the high strength concrete is used for concrete repairs

L3 Application 2

10.5 What is meant high density concrete? L1 Knowledge 2

10.6 Comment on Different types of fibres used in concrete L3 Application 2

10.7 What is meant vacuum concrete? L1 Knowledge 2

10.8 Write about hot weather concreting L2 Comprehension 2

Part – B ( 5 x 16 = 80 Marks) or Part – B ( 5 x 13 = 65 Marks)

UNIT- V

15.a-1 Examine High Performance concrete. Explain the properties and application

L1 Knowledge (13)

15.a-2 What meant by Ready Mix Concrete? Explain their advantages and disadvantages?

L3 Application (13)

15.a-3 Describe ready mixed concrete, high density concrete, fibre reinforced Concrete, light weight concrete and polymer concrete.

L2 Comprehension(13)

15.a-4 List out the problems encountered in hot weather concreting? What are the Precautions included in hot weather concreting?

L1 Knowledge(13)

15.a-5 Explain the problems encountered in cold weather concreting? What are the Precaution included in cold weather concreting

L2 Comprehension(13)

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15.b-1 Explain detailed about Light weight concrete and its types L3 Application (13)

15.b-2 Explain the Sulphur infiltrated concrete in detail L3 Application (13)

15.b-3 Illustrate the various properties of SIFCON concrete and explain them in detail

L3 Application (13)

15.b-4 Illustrate the fresh state properties of high-strength concrete

L3 Application (13)

15.b-5 Evaluate long term properties of high strength concrete? Compare them with those of conventional concrete.

L5 Evaluation (13)

Part – C ( 1 x 15 = 15 Marks)

UNIT-V

16 .a-1 Analyze lightweight concrete preferred for construction particulars in multi-storey building? Explain with respectto their physical characteristics of lightweight aggregate concrete.

L4 Analysis

(15)

16 .a-2 Illustrate Polymer, High performance of concrete and Geo polymer concrete

L5 Evaluation (15)

(OR)

16.b-1 Give a list of laboratory equipment required to ensure the quality of ready mixed concrete supplied to the contractor.

L3 Application(15)

16.b-2 What are basic properties of fibre-reinforced concrete which can be advantageously made use of in the design ofstructural elements?

L5 Evaluation

(15)

L1: Knowledge, L2: Comprehension, L3: Application, L4: Analysis, L5: Evaluation, L6: Synthesis

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QUESTION BANK SUMMARY

S.NO UNIT DETAIL

SL1 L2 L3 L4 L5 L6 TOTAL

1 Unit-1PART-A 10 5 1 16PART-B 3 4 1 8PART-C 1 2 1 4

2 Unit-2PART-A 11 1 2 14PART-B 3 5 8PART-C 2 2 4

3 Unit-3PART-A 8 3 1 1 3 16PART-B 3 2 5 10PART-C 1 4 1 6

4 Unit-4PART-A 6 5 2 3 16PART-B 1 4 1 2 8PART-C 1 1 1 1 4

5 Unit-5PART-A 5 7 4 16PART-B 2 2 5 1 10PART-C 1 1 1 1 4

Total No of QuestionsPART-A PART-B PART-C TOTAL

80 44 22 146

Prepared By:Staff Name1: N.PRASANTH Staff Name2:

STAFF IN CHARGE HOD PRINCIPAL

DEPARTMENT OF CIVIL ENGINEERING