Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 4th Sem New 2140608 Concrete Technology Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV (NEW) EXAMINATION ? WINTER 2018
Subject Code:2140608 Date:01/12/2018
Subject Name:Concrete Technology
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) How is the cement checked on site? How is the field testing important? 03
(b) Differentiate between
1. Mortar and concrete
2. Setting and Hardening of cement
04
(c) Determine the Fineness Modulus for the given Sieve analysis performed on Fine
aggregate
IS sieve
size
10
mm
4.75
mm
2.36
mm
1.18
mm
600 ? 300 ? 150 ?
Weight
retained gm
0 25 45 50 95 175 80
07
Q.2 (a) Explain the effect of size, shape, texture and grading on concrete. 03
(b) Discuss the various factors affecting the workability of concrete. 04
(c) Explain different methods of curing procedure. 07
OR
(c) Explain soundness test in detail with neat sketch and also specify its Indian
standards.
07
Q.3 (a) What is alkali-silica reactivity (ASR) and how is it avoided? 03
(b) What are the essential characteristics of water that can be used for mixing and
curing of concrete?
04
(c) Write short note on air entrained concrete. 07
OR
Q.3 (a) Make a list of all the factors that affect Durability of Concrete structures. 03
(b) Draw the typical stress-strain curve of concrete and explain the various modulus
of elasticity
04
(c) Write short note on ready mix concrete 07
Q.4 (a) Briefly explain Gel-space ratio. 03
(b) Write a brief note on ?Rotary Kiln?. 04
(c) The results of compressive strength test on 15 cubes of a batch in MPa are 19, 18,
21, 24, 19, 18.5, 20, 21.5, 22, 23, 19.5, 17.5, 24, 21, 20. Find Standard Deviation
and Coefficient of Variation for the batch.
07
OR
Q.4 (a) Define admixtures and creep. 03
(b) Define the term ?Bulking of aggregates?. Explain its significance with reference
to concrete making.
04
(c) What are Bouge?s compounds? Explain in detail how each one of these
compounds influences the strength and setting properties of cement.
07
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Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV (NEW) EXAMINATION ? WINTER 2018
Subject Code:2140608 Date:01/12/2018
Subject Name:Concrete Technology
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) How is the cement checked on site? How is the field testing important? 03
(b) Differentiate between
1. Mortar and concrete
2. Setting and Hardening of cement
04
(c) Determine the Fineness Modulus for the given Sieve analysis performed on Fine
aggregate
IS sieve
size
10
mm
4.75
mm
2.36
mm
1.18
mm
600 ? 300 ? 150 ?
Weight
retained gm
0 25 45 50 95 175 80
07
Q.2 (a) Explain the effect of size, shape, texture and grading on concrete. 03
(b) Discuss the various factors affecting the workability of concrete. 04
(c) Explain different methods of curing procedure. 07
OR
(c) Explain soundness test in detail with neat sketch and also specify its Indian
standards.
07
Q.3 (a) What is alkali-silica reactivity (ASR) and how is it avoided? 03
(b) What are the essential characteristics of water that can be used for mixing and
curing of concrete?
04
(c) Write short note on air entrained concrete. 07
OR
Q.3 (a) Make a list of all the factors that affect Durability of Concrete structures. 03
(b) Draw the typical stress-strain curve of concrete and explain the various modulus
of elasticity
04
(c) Write short note on ready mix concrete 07
Q.4 (a) Briefly explain Gel-space ratio. 03
(b) Write a brief note on ?Rotary Kiln?. 04
(c) The results of compressive strength test on 15 cubes of a batch in MPa are 19, 18,
21, 24, 19, 18.5, 20, 21.5, 22, 23, 19.5, 17.5, 24, 21, 20. Find Standard Deviation
and Coefficient of Variation for the batch.
07
OR
Q.4 (a) Define admixtures and creep. 03
(b) Define the term ?Bulking of aggregates?. Explain its significance with reference
to concrete making.
04
(c) What are Bouge?s compounds? Explain in detail how each one of these
compounds influences the strength and setting properties of cement.
07
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Q.5 (a) What are the Principles of concrete mix design? 03
(b) Explain the adverse effect of excessive use of admixture? 04
(c) What is non-destructive testing of in-situ fresh and hardened concretes? Discuss
the pulse velocity method.
07
OR
Q.5 (a) Using IS-10262(2009) method of mix design, find out proportions of concrete for
following data:
Grade of Concrete: M 25
Degree of Control: Very good
Maximum size of Aggregate: 10 mm
Specific gravity of Cement: 3.15
Specific gravity of FA: 2.70
Specific gravity of CA: 2.82
Condition of Exposure: severe
Workability: Slump 75-100 mm
Refer table 1 to 4.
14
Table 1
EXPOSURE
RCC PCC Min Grade
MINIMUM
CEMENT
CONTENT
MAX FREE
W/C
RATIO
MINIMUM
CEMENT
CONTENT
MAX FREE
W/C RATIO
PCC RCC
MILD 300 0.55 220 0.6 M20
MODERATE 300 0.50 240 0.6 M15 M25
SEVERE 320 0.45 250 0.5 M20 M30
VERY SEVERE 340 0.45 260 0.45 M20 M35
EXTREME 360 0.40 280 0.4 M25 M40
Table 2
No. Grade Std. deviation
1 10
3.5
2 15
3 20
4
4 25
5 30
5 6 35
7 40
TABLE 3
No
Max. size of
aggregate
(mm)
Maximum
Water
Content
(kg)
1 10 208
2 20 186
3 40 165
TABLE 4
Nominal Maximum
size of aggregate,
mm
Volume of coarse aggregate per unit volume of total aggregate
for different zones of fine aggregate (For w/c ratio of 0.5
Zone IV Zone III Zone II Zone I
10 0.5 0.48 0.46 0.44
20 0.66 0.64 0.62 0.6
40 0.75 0.73 0.71 0.69
Volume of coarse aggregate per unit volume of total aggregate needs to
be changed at the rate of -/+ 0.01 for every +-0.05 change in w/c ratio
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This post was last modified on 20 February 2020