JNTU
JNTU B.Tech III CONCRETE TECHNOLOGY Previous Question Paper (July/August - 2023 - R16)
Note: i) Question paper consists of Part A, Part B.
ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions.
iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
iv) No code book or data sheet is allowed.
Part A
How is fineness of cement measured?
Answer
Fineness of cement is measured by the Blaine's air permeability test (which determines the specific surface area in m²/kg) or by the sieve analysis method using a 90-micron IS sieve.
What are the different physical tests of cement?
Answer
The primary physical tests for cement include:
- Fineness test
- Consistency test
- Setting time test (Initial and Final)
- Soundness test
- Compressive strength test
- Specific gravity test
What is gap grading of aggregates?
Answer
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What is maximum size of aggregate used in concrete?
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What are advantages of low w/c ratio in concrete?
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What is revibration? What are advantages of revibration?
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What is creep? List various factors affecting creep.
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Write about Abram’s law and Gel space ratio.
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List different types of fibers used in FRC.
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Write about no-fines concrete.
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Part B
Explain dry process of manufacturing the cement with neat diagram. Explain advantages over the wet process.
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What are main compounds of cement? Explain the hydration of main compounds of cement.
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Write short notes on: i) accelerators ii) silica fume.
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What are impurities or deleterious substances in aggregate and their effects?
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Discuss about thermal properties of aggregates.
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Write short notes on soundness of aggregates.
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Explain briefly how the aggregates are classified based on different properties of aggregate.
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Write in detail about segregation and bleeding of concrete.
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List various methods of curing and explain about water curing and high pressure steam curing.
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What are the factors affecting workability?
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Write about ready mixed concrete.
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What are the factors affecting the strength of concrete?
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Discuss how rebound hammer is used to determine the strength of concrete and its working principle?
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Explain relation between Modulus of elasticity and strength.
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What are the advantages of NDT over destructive tests?
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Design a concrete mix of M25 grade for a roof slab. Take a Standard deviation of 4MPa. The specific gravities of Coarse Aggregate and Fine Aggregate are 2.75 and 2.58 respectively. The bulk density of coarse aggregate is 1630kg/m3 and fineness modulus of fine aggregate is 2.78. A slump of 60mm is necessary. The water absorption of coarse aggregate is 1% and free moisture in fine aggregate is 2%. Design the concrete mix using IS code method. Assume any missing data suitably.
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What is FRC? What are the factors affecting the properties of FRC?
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Write short notes on SIFCON.
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