JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III Year CONCRETE TECHNOLOGY Previous Question Paper (August/September - 2024 - 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
Classify the various grades of cement in India.
Answer
In India, Ordinary Portland Cement (OPC) is classified into three grades based on its 28-day compressive strength: 33 Grade, 43 Grade, and 53 Grade. These numbers represent the minimum compressive strength in N/mm² achieved after 28 days of curing.
List out the desirable properties of cement.
Answer
The desirable properties of cement include: 1) Fineness, which influences the rate of hydration and strength development; 2) Soundness, ensuring the cement does not undergo excessive volume change after setting; 3) Setting time (initial and final), allowing sufficient time for mixing, placing, and compacting; and 4) Compressive strength, which determines the load-bearing capacity of the concrete.
Brief about grading of aggregate.
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Illustrate the properties of river sand.
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What is the affect of fly ash on fresh concrete?
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What are the factors affecting fresh concrete properties.
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Compare physical properties for fresh and hardened concrete.
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Define durability.
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How sampling of concrete should be done for quality control tests?
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What is proportioning of concrete mix?
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Part B
Discuss various ingredients required for manufacturing of cement? State their functions and properties of cement.
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Categorize the different types of cement and explain any four in brief.
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Explain the following tests conducted on aggregate; as per IS codes:
Water Absorption
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Flakiness Index and Elongation Index.
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Compare river sand and crushed sand. Explain the properties of crushed sand.
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Make a comparative study on the slump test and the compacting factor test and explain briefly the procedure and their limitations.
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Explain the properties of fresh concrete and relevant tests to be performed to determine them.
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Explain Abram's Law and its significance in determining the strength of concrete. How does the water/cement ratio influence the hardened properties of concrete?
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What is the maturity concept in concrete? How is it used to predict the strength development of concrete?
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Design a M40 concrete using IS 10262 for the following data. Maximum size of aggregate = 20 mm (angular, IS 383), compacting factor 0.90, type of exposure moderate, specific gravity of cement, FA, CA = 3.15, 2.6, 2.7, Zone of sand = Zone III, Water absorption of CA, FA = 0.6%, 1.2%, free moisture on CA, FA = 0.1%, 2.0%.
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What is fibre reinforced concrete? Discuss the types of fibres used, their effects on concrete properties.
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