Download GTU BE/B.Tech 2019 Summer 4th Sem New 2140608 Concrete Technology Question Paper

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Subject Code: 2140608

GUJARAT TECHNOLOGICAL UNIVERSITY

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SEMESTER-IV(NEW) — EXAMINATION — SUMMER 2019

Subject Name: Concrete Technology

Time: 02:30 PM TO 05:00 PM

Instructions:

1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

1. Explain the effect of water cement ratio on the workability and strength of Concrete? [03]
2. Define the primary and secondary hydration process of Cement Paste. [04]

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3. Write down merits and demerits of concrete properties in terms of workability, strength and durability while using the Ordinary Portland Cement and Portland Pozzolana Cement. [03]

Q.2

1. Differentiate between setting and hardening of cement. [04]
2. Describe the wet process of manufacturing of cement in the flow chart. [07]
3. Describe the test for determining initial and final setting time of cement. [03]

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OR

1. What is sustainability of concrete? How to make concrete sustainable according to your viewpoint? [04]

Q.3

1. List out the factors affecting the workability of concrete and explain anyone in detail. [07]
2. Differentiate between volume batching and weigh batching in concrete mix procedure. [03]

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3. State the different methods of concrete curing and explain anyone in detail. [04]

OR

1. List out the factors affecting the segregation & explain anyone. [07]

Q.4

1. List out various types of special concreting techniques & write the merits of ready-mixed concrete. [03]

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2. List out a minimum of seven types of special concrete & describe lightweight aggregate concrete. [04]
3. Write down the purpose of adding Chemical Admixtures in concrete. [07]

OR

1. List out the factors affecting shrinkage and explain any one in detail. [03]

Q.5

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1. Write down the factors affecting the strength of concrete & describe any three in detail. [04]
2. Why compressive strength of concrete performed on 7 days and 28 days? Give your comments on that. [07]

OR

1. List various crack repair techniques and explain any one in detail. [03]

1. Describe the Rebound Hammer Test with the labelled sketch. Write down the limitations of this test method. [04]

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2. Explain in brief about freezing and thawing effect of concrete. [07]

1. Write down the various advantages of Quality control of the concrete mix. [03]

Date: 15/05/2019

Total Marks: 70

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Explain step by step procedure of concrete mix design as per IS code.

OR

Q.5

1. Briefly explain the Alkali-aggregate reaction. [03]
2. Explain Sulphate Attack on concrete. [04]

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3. List out the factors affecting the permeability of concrete. Explain any two out of them. [07]

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