JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III CONCRETE TECHNOLOGY Previous Question Paper (November/December - 2017 - R13)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
PART - A
What does the grade of cement indicate?
Answer
The grade of cement indicates the minimum compressive strength of a 1:3 cement-sand mortar cube (70.6 mm) tested after 28 days of curing, expressed in N/mm².
What are the merits and demerits of gap graded aggregate.
Answer
Merits: It requires less cement paste to fill voids, reduces the surface area of aggregates, and can result in higher density and better workability for specific applications. Demerits: It is highly sensitive to variations in mix proportions, prone to segregation during transportation, and may result in a harsh mix if not properly designed.
For which type of mix do you use Vee-Bee test? What are the units of measurements?
Answer
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What is the simple test for suitability of water as per IS 456 code?
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Define the Abram’s law.
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What are the different types of Shrinkage of concrete?
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Define the term ‘Durability’ of concrete?
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Differentiate between characteristic mean strength and target mean strength in concrete mix design.
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What is Cellular concrete?
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Differentiate between RCC and Fibre reinforced concrete.
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PART - B (Unit I)
Explain the chemical composition of ordinary Portland cement.
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What is bulking of fine aggregate? Explain how bulking chart is prepared?
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Explain in detail about surface acting admixtures.
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Determine the fineness modulus of following aggregate sample of 5 kg.
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PART - B (Unit II)
Explain various steps in manufacture of concrete.
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Explain about mixing of concrete and the effect of mixing time on properties of concrete.
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Explain in detail about segregation of fresh concrete, factors effecting segregation.
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With neat sketches explain compaction factor test as per IS standards.
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PART - B (Unit III)
Calculate the maturity of M30 grade concrete at 14 days and 28 days when it is cured for 12 hours at 14°C and 25°C for the rest of a day. Plowman’s constants A=21; B=61.0
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Explain the ultrasonic pulse velocity type of non destructive testing on hardened concrete? How the quality is assessed with UPV test?
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What are the factors influencing creep?
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Explain splitting tension test on concrete with neat sketches.
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PART - B (Unit IV)
Write a short note of Statistical quality control of concrete.
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Explain effect of shape, size, water cement ratio on the design of concrete mixes? How they are taken care on BIS mix design.
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Explain in detail the step wise mix design procedure for standard grade concrete using BIS method.
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How bulking of sand is taken care in field mixes?
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PART - B (Unit V)
Briefly explain about light weight aggregate concrete.
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Explain the effect of orientation and aspect ratio on the properties of fibre reinforced concrete.
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Explain ‘V’ funnel test for SCC with neat sketches? What are its EFNARC specifications.
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Write short notes on polymer impregnated concrete.
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