Hall Ticket No:
Question Paper Code: A3107
VARDHAMAN COLLEGE OF ENGINEERING
(AUTONOMOUS) B. Tech IV Semester Regular/Supplementary Examinations, May 2018
(Regulations: VCE-R15) CONCRETE TECHNOLOGY
(Civil Engineering) Date: 08 May, 2018 FN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Unit I
1.
Discuss the difference between the wet and dry process of manufacturing of Portland
Cement.
8M
What are the different raw materials required for the manufacture of cement? Explain how the quality of raw materials influences the properties of cement.
7M
2.
Explain different grades of cement and explain Fineness Modulus.
9M
Explain the properties of aggregates to be used in concrete.
6M
Unit II
3.
Define workability, And explain the factors affected by workability.
8M
What are the different tests used for measurement of workability, explain any one?
7M
4.
Differentiate between true slumps, shear slump with neat sketches.
7M
Explain segregation and bleeding in fresh concrete? Mention what are their effects on strength properties.
8M
Unit III
5.
Calculate the gel/space ratio and theoretical strength of a sample of concrete made with 800 grams of cement with water cement ratio as 0.65 on:
i. Full hydration
ii. 65% hydration
8M
As Site engineer how do you identify the difference between creep and shrinkage? Enlist the Factors Affecting the Creep. What are the design strategies that you adopt to avoid creep?
7M
6.
List out the different tests to evaluate properties of concrete in hardened state. Explain any one.
8M
Differentiate between secant modulus, tangent modulus and initial tangent modulus. Explain these with respect to stress-strain diagram of concrete.
7M
Unit IV
7.
Design a mix design for M25 grade of concrete with the following data:
i. Type of cement: opc with 30% of flyash
ii. Maximum size of aggregates: 20mm
iii. Workability:100mm slump
iv. Min cement content:300kg/m3 e. 0.5
v. Method of placing of concrete: pumping
vi. Degree of supervision: good
vii. Specific gravity of coarse aggregate: 2.8
viii. Specific gravity of fine gravity:2.65
ix. Water absorption-nil
x. Free surface moisture: nil
15M
8.
Explain the chloride and sulphate attack on concrete. How can it be prevented?
8M
What is mix design of concrete? Elaborate various factors to be considered for mix design of concrete?
7M
Cont…2
2
Unit V
9.
As an engineer at site explain the type to concrete to be adopted at following condition? Also explain at least three important property they posses:
i. At heavily reinforced structure
ii. As non load bearing structure
8M
How no-fines concrete is prepared? What are its applications?
7M
10.
How the cellular concrete is prepared? What are its applications?
7M
Write a note on self compacting concrete.
8M