Code No: R31013
R10
Set No: 1
III B.Tech. I Semester Regular Supplementary Examinations, December - 2013
CONCRETE TECHNOLOGY
(Civil Engineering)
Time: 3 Hours
Max Marks: 75
Answer any FIVE Questions
All Questions carry equal marks
**
1. What is the difference between Portland cements and non-Portland cements? List all
the commonly used portland cements and non-portland cements and briefly explain
each of them.
2. (a) Classify different types of aggregate and on what bases they can be classified?
(b) What are the factors to be considered during the study of aggregates?
(c) Categorize different aggregates based on their size.
3. (a) Discuss in detail the action of plasticizers in concrete.
(b) What do you understand by superplasticizers and their effect on fresh concrete?
(c) How to determine optimum dose of superplasticizer to concrete?
(d) What are the various problems in use of superplasticizers?
4. Discuss in detail the various tests that are commonly employed to measure workability
of concrete.
5. (a) Differentiate high strength concrete from high performance concrete.
(b) Write short notes on: (i) Self consolidated concrete; (ii) Fly ash concrete; and (iii)
High alumina concrete.
6. (a) What is Shrinkage-induced cracking?
(b) What is Shrinkage-compensating concrete?
(c) Write short notes on: (i) Elasticity; (ii) Creep; and (iii) Shrinkage
7. Design M20 grade concrete mix for the following data using BIS method:
CA: 18 mm crushed granite
FA: River sand conforming to zone II
Workability : 0.92 compacting factor
Quality control : good
Exposure : mild
Cement : OPC 53 grade
Specifc gravity : cement : 2.99; FA: 2.65; CA: 2.55
Water absorption by CA : 1 %
Free surface moisture in FA: 1%
Bulky of FA: 12%
8. Write short notes on: (i) Aerated concrete; (ii) No fines concrete; (iii) High density
concrete and (iv) shotcrete.
**
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Code No: R31013
R10
Set No: 2
III B.Tech. I Semester Regular Supplementary Examinations, December - 2013
CONCRETE TECHNOLOGY
(Civil Engineering)
Time: 3 Hours
Max Marks: 75
Answer any FIVE Questions
All Questions carry equal marks
**
1. Discuss the significance of the following tests on cement and describe in detail the
procedure of conducting each of them: (a) Fineness test; and (b) Setting time test
2. Explain in detail the various methods that are adopted for determination of moisture
content of aggregate.
3. Write short notes on the following: (a) Various factors related to plasticizers that effect
workability; and (b) Effect of superplasticizers on properties of hardened concrete
4. Discuss in detail the various stages of manufacture of concrete.
5. (a) Explain the factors affecting the strength of hardened concrete.
(b) Estimate the strength of concrete at 21 days using maturity concept for M40 Grade
cement cured at 120C for 4 hours and 180C for 8 hours and 210C for the rest of the
period? Plowman’s coefficients are A = 21 and B = 61.
6. (a) Explain the relation between modulus of elasticity and strength of concrete.
(b) Explain the factors effecting modulus of elasticity of concrete.
7. Design M20 grade concrete mix for the following data using BIS method:
CA: 16 mm crushed granite
FA: River sand conforming to zone III
Workability : medium
Quality control : medium
Exposure : moderate
Cement : OPC 53 grade
Specifc gravity : cement : 2.99; FA: 2.65; CA: 2.55
Water absorption by CA : 3 %
Free surface moisture in FA: 3%
Bulky of FA: 10%
8. Discuss in detail the fibre reinforced concrete, elaborating on the various types of fibres
that are commonly adopted, and factors effecting properties of FRC.
**
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Code No: R31013
R10
Set No: 3
III B.Tech. I Semester Regular Supplementary Examinations, December - 2013
CONCRETE TECHNOLOGY
(Civil Engineering)
Time: 3 Hours
Max Marks: 75
Answer any FIVE Questions
All Questions carry equal marks
**
1. Explain the significance of each of the following tests on cement and describe in detail
the procedure of conducting each of them: (a) Standard consistency; and (b) Soundness
test.
2. Write short notes on the following: (a) Bulking phenomenon of fine aggregate and its
effect; (b) Specific surface and surface index; (c) Flakiness index; and (d) Elongation
index.
3. Write short notes on the following: (a) Slump loss; and (b) Pozzolanic admixtures
4. Discuss the significance of the following phenomenon of concrete and describe in detail
the method to measure the same quantitatively, if practicable: (a) Segregation; and (b)
Bleeding
5. Write short notes on:
(a) Water/cement ratio and Abrams law.
(b) Maturity of concrete and its estimation using Plowman’s equation.
(c) Gel/space ratio and its estimation for complete and partial hydration.
(d) Relation between compressive and tensile strength .
6. (a) Explain in detail the following parameters of concrete and discuss in detail the
procedure to calculate the same: (i) Dynamic modulus of elasticity; and (ii) Poisson’s
ratio.
(b) Write short notes on: (i) Creep; and (ii) Shrinkage
7. Design M25 grade concrete mix for the following data using BIS method:
CA: 20 mm crushed granite
FA: River sand conforming to zone IV
Workability : medium
Quality control : medium
Exposure : moderate
Cement : OPC 53 grade
Specifc gravity : cement : 3.0 ; FA: 2.6 ; CA: 2.55
Water absorption by CA : 2 %
Free surface moisture in FA: 3%
Bulky of FA: 8 %
8. Discuss in detail the following special concreting methods:
(a) Cold weather concreting; and (b) Hot weather concreting
**
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Code No: R31013
R10
Set No: 4
III B.Tech. I Semester Regular Supplementary Examinations, December - 2013
CONCRETE TECHNOLOGY
(Civil Engineering)
Time: 3 Hours
Max Marks: 75
Answer any FIVE Questions
All Questions carry equal marks
**
1. Discuss the significance of the following tests on cement and describe in detail the
procedure of conducting each of them: (a) Setting time test; and (b) Heat of hydration
2. Write short notes on the significance of each of the following tests on aggregate and
describe in detail the procedure of conducting each of them: (a) Test for determination
of clay, fine silt and fine dust; and (b) Test for determination of aggregate impact value
3. Write short notes on the following: (a) Retarders and accelerators; and (b) Silica Fume
4. (a) What is the effect of vibration on the strength and durability of concrete?
(b) Explain different types of vibrators.
5. Explain in detail the following phenomenon of concrete: (a) Gain of strength with age;
and (b) Bond strength between concrete and steel reinforcement.
6. Discuss in detail the following phenomenon of concrete, including the factors affecting
and methods to measure the same: (i) Creep; and (ii) Shrinkage
7. Design M30 grade concrete mix for the following data using BIS method:
CA: 16mm crushed granite
FA: River sand conforming to zone III
Workability : 0.9 compacting factor
Quality control : good
Exposure : mild
Cement : OPC 53 grade
Specific gravity : cement : 3.15; FA: 2.6 ; CA: 2.6
Water absorption by CA : 0.5 %
Free surface moisture in FA: 1%
Bulky of FA: 10%
8. Write short notes on: (i) Light weight concrete; (ii) No fines concrete; (iii) High density
concrete; and (iv) Self compacting concrete
**
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