Concrete Technology 4th Sem Civil May 2015 Diploma Paper

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Concrete Technology 4th Semester Civil/0512/May 2015 Paper

                                                SECTION-A

Q1. Do as directed.                                                                                                                      15×1=15

  1. Strength of concrete with time increase.

  2. The initial setting time of OPC is 30 minut

  3. Gypsum is used as a retarder in manufacturing of ordinary Portland

  4. Water cement ratio is generally expressed in litters.

  5. Separation of coarse aggregates from the concrete mix is called segregation.

  6. Round and Smooth aggregates more the workability.

  7. The extended size of cube for concrete testing is 300mm

  8. M 20 grade of concrete should have 1:1.5:3 proportion of ingredients.

  9. CaCl2 can be used as an accelerators.

  10. Cements always batched by weight.

b) State True or False.

  1. Cement should be stored for a longer Period.        (False)

  2. Slump required for machine compaction is Less .(True)

  3. Grades lower then M20 should not be used in RCC .(True)

  4. Separation of coarse aggregate from concrete mix is known as Bleeding.(False)

  5. Increase in water content decreases workability   (False)

              SECTION-B

Q2. Attempt any five questions.                                                                    5×6=30

  1. Write the advantages and disadvantages of concrete.

  2. Name the different types of cement. Give its chemical composition of OPC.

  3. Explain the slump test of concrete for workability.

  4. What do you mean by proportioning for normal concrete?

  5. Explain causes and preventation of segregation in concrete mix.

  6. What precautions will you take before placing concrete in hot weather?

  7. Define Admixtures. Explain the importance of adding admixture in concrete.

  8. What is bulking of sand? How does it effect the batching process ?

  9. What are the various method of transportation of concrete?

     SECTION-C

Q3. Attempt any three questions.                                                       3×10=30

  1. Define workability of concrete and discuss the various factors which influence this property.

  2. Give the requirement of a ware house for the storage of cement ? What precautions will you under take while storing cement in ware houses?

  3. State the importance of water cement ration law. Explain with the help of a graph, the relationship between concrete strength of concrete. Discus the effect of age, temperature, specimen size, humidity and grading of aggregate on compressive strength of concrete.

  4. Define Curing. Give its objectives and method of curing.

  5. Explain the properties of concrete in the harden state ?

Concrete Technology CT 4th Sem Civil/0512/may2015 Solved Paper

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Section a FILL IN THE BLANKS cONCRETE TECHNOLOGY dec 2017 paper

Strength of concrete increases with time.

 

Concrete hard on Drying.

 

Concrete pavements are known as Ridge Pavement.   .

  1. Admixtures increases workability.

  2. For determining compressive strength of cement, standard sand is used.

  3. Vicat’s Apparatus is used for determining initial and final setting time of cement.

  4. The weight of one bag of cement is  50 Kg 

  5. Ready mix concrete is also called site mixed concrete

  6. Chemical reaction between cement & water is called hydration.

  7. Finerthe cement, more is the hydration.

b) State true or false.

  1. Accelerators are used during hot weather concreting.  T/F (False)

  2. Curing reduces the shrinkage of concrete. T/F (True)

  3. Height of one bag of cement is 18 cm.T/F (False)

  4. Water cement ratio in hot weather concrete will decrease. T/F (False)

  5. Ware house is used to store concrete.T/F (False)

Admixtures increases workability.

 

For determining compressive strength of cement, standard sand is used.

Vicat’s Apparatus is used for determining initial and final setting time of cement.

  1.  

The weight of one bag of cement is  50 Kg 

Ready mix concrete is also called site mixed concrete.

Chemical reaction between cement & water is called hydration.

Finerthe cement, more is the hydration.

 

b) State true or false.

(False)

(True)

(False)

 

(False)

 

 

False

Download Previous Year Concrete Technology PSBTE Diploma Solved Paper May 2017 Click Here

Section B : cONCRETE TECHNOLOGY PAPER MAY 2018 PAPER

Advantages of concrete as compared to other building materials 

 

Properties of concrete in plastic & hardened stage.

 

Functions of C2S & C3A in cement.

workability of concrete.

Importance of performing slump test

Effect of low temperature of concrete

Uses of fibre reinforced concrete.

 

Concrete Technology Civil 4th Semester  PSBTE Diploma Solved Dec 2017 Paper Click Here

Concrete Technology CT 4th Sem Civil/0512/may 2015 Solved Paper

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Section c solved concrete technology dec 2017 paper

Difference between segregation and bleeding? Discuss the factors affecting workability.

Importance of batching 

Different tests on hardened concrete 

Mix design What is bulking of aggregate?

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