JNTU
JNTU B.Tech III CONCRETE TECHNOLOGY Previous Question Paper (May/June - 2019 - 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 and may have a, b, c as sub questions.
Part A
List different types of admixtures.
Answer
Admixtures are classified into two main categories: chemical admixtures (such as water-reducing agents, accelerators, retarders, and air-entraining agents) and mineral admixtures (such as fly ash, silica fume, ground granulated blast furnace slag, and rice husk ash).
Explain adsorption of aggregates.
Answer
Adsorption of aggregates refers to the process where water or chemical admixtures adhere to the surface of the aggregate particles. This phenomenon is critical because it influences the effective water-cement ratio of the mix; if aggregates are porous, they absorb water, reducing the workability of the concrete, whereas surface adsorption of chemical admixtures can affect the setting time and dispersion of cement particles.
Explain about mixing of concrete.
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Define segregation and bleeding.
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Explain gel space ratio.
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List the factors affecting strength of concrete.
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Explain the failure mechanism of compression test specimen.
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Explain the durability of concrete.
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Explain the importance of quality control of concrete.
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What is meant by fibre reinforced concrete?
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Part B
Explain the phenomenon of bulking of sand. How to test for bulking characteristics?
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Describe the Bogue chemical compound composition of Portland cement.
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Explain the effect of time and temperature on workability of concrete.
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Describe the importance of curing and duration of curing of concrete.
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Explain in detail how the flexure test is conducted on hardened concrete?
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Describe the process of determining various elastic moduli of concrete. Also explain the factors affecting the modulus of elasticity of concrete.
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Discuss in detail the methods employed for mix proportioning of concrete.
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Give the mix design steps for M20 concrete by BIS method.
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What is polymer concrete? Explain different types of polymer concretes with their properties.
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Describe various methods of producing light weight aggregates artificially.
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