STUPIDSID
Solve any one question from Q.1(a,b) &Q.2(a,b)
1(a)
What are the Bogue's compounds? State the significance of each compound.
6 M
1(b)
State and explain various operations involved during the concreting from mixing to finishing of concrete surface.
6 M
2(a)
Explain alkali aggregate reaction. State factors promoting and control of the reaction.
6 M
2(b)
Define workability. State and explain factors affecting workability.
6 M
Solve any one question from Q.3(a,b) & Q.4(a,b)
3(a)
Define creep of concrete. What are the factors affecting.
6 M
3(b)
What are the special problems encounted in hot weather concreting? How are they rectified?
6 M
4(a)
State the various types of destructive tests carried on hardened concrete. Explain " Flesural Test"
6 M
4(b)
Define Ferrocement. Explain the basic concept in forming ferrocement composites used in construction industry?
6 M
Solve any one question from Q.5 & Q.6(a,b,c)
5
Using Indian Standard recommended guidelines, design a concrete mix for a reinforced concrete structure to be subjected to the severe exposure conditions for the following requirements:
A) Situpulations for proportioning
i) Grade designation: M35,
ii) Standard deviation, s=5
iii) Type of cement: OPC 53 grade conforming to IS 8112
iv) Workability: 100 mm(slump)
v) Degree of supervision: Good
vi) Type of aggregate: Angular coarse 20mm aggregate,
vii) Maximum cement content: 450 kg/m3
viii) Chemical admixture type: 2% Superplasticizer conforming to IS 9103
B) Test data of materials
i) Specific gravity of cement: 3.15
ii) Specific gravity of admixutre: 1.145
iii) Specific gravity of a) Coarse aggregate - 2.74
b) Fine aggregate - 2.74
iv) Water absorption
a) Coarse aggregates - 0.5%
b) Find aggregates - 100%
v) Free surface moisture
a) Coarse aggregates- Nil (absorbed moisture also nil)
b) Fine aggregates - Nil
Sieve analysis a) Coarse aggregate:
b) Fine aggregate: Conforming to grading zone I
c) Design considerations:
Table 2: From IS 10262; Volume of Coarse Aggregate per Unit Volume of Total Aggregate
Table3: From IS 456, Different Exposure conditions for reinforced concrete
A) Situpulations for proportioning
i) Grade designation: M35,
ii) Standard deviation, s=5
iii) Type of cement: OPC 53 grade conforming to IS 8112
iv) Workability: 100 mm(slump)
v) Degree of supervision: Good
vi) Type of aggregate: Angular coarse 20mm aggregate,
vii) Maximum cement content: 450 kg/m3
viii) Chemical admixture type: 2% Superplasticizer conforming to IS 9103
B) Test data of materials
i) Specific gravity of cement: 3.15
ii) Specific gravity of admixutre: 1.145
iii) Specific gravity of a) Coarse aggregate - 2.74
b) Fine aggregate - 2.74
iv) Water absorption
a) Coarse aggregates - 0.5%
b) Find aggregates - 100%
v) Free surface moisture
a) Coarse aggregates- Nil (absorbed moisture also nil)
b) Fine aggregates - Nil
Sieve analysis a) Coarse aggregate:
| IS Sieve sizes (mm) | Analysis of Coarse Aggregate Fraction | Percentage of different Fractions | Remarks | |||
| I | I |
I (60%) |
II (40%) |
Combined (100%) |
Confirming of Table 2 of IS 383 | |
| 20 | 100 | 100 | 60 | 40 | 100 | |
| 10 | 0 | 71.2 | 0 | 28.5 | 28.5 | |
| 4.75 | 9.40 | 3.7 | 3.7 | |||
| 2.36 | 0 | |||||
b) Fine aggregate: Conforming to grading zone I
c) Design considerations:
Table 2: From IS 10262; Volume of Coarse Aggregate per Unit Volume of Total Aggregate
|
SI No. (1) |
Nominal Maximum Size of Aggregate (mm) | Volume of Coarse Aggregate per Unit volume of Total Aggregate for Different Zones of Fine Aggregate | |||
|
Zone (IV) |
Zone (III) |
Zone (II) |
Zone (I) |
||
| i) | 10 | 0.50 | 0.48 | 0.46 | 0.44 |
| ii) | 20 | 0.66 | 0.64 | 0.62 | 0.60 |
| iii) | 40 | 0.75 | 0.73 | 0.71 | 0.69 |
Table3: From IS 456, Different Exposure conditions for reinforced concrete
| Sr.No | Exposure | Minimum cement content (kg/cubic m) | Maximum free water cement ratio | Minimum grade of concrete |
| i) | Mild | 300 | 0.55 | M20 |
| ii) | Moderate | 300 | 0.50 | M25 |
| iii) | Severe | 320 | 0.45 | M30 |
| iv) | Very severe | 340 | 0.45 | M35 |
| v) | Extreme | 360 | 0.40 | M40 |
13 M
6(a)
What do you mean by nominal mix. Standard mix and design mix?
4 M
6(b)
What are the various factors affecting concrete mix design?
4 M
6(c)
Explain DOE method of mix design in brief.
5 M
Solve any one question from Q.7(a,b) &Q.8(a,b)
7(a)
Explain in detail permeability and factors affecting permeability of the concrete.
5 M
7(b)
Write short note on:
i) Symptoms and diagnosis of distress of concrete
ii) Corrsion monitoring techniques and preventive measures
i) Symptoms and diagnosis of distress of concrete
ii) Corrsion monitoring techniques and preventive measures
8 M
8(a)
Explain process of preparation of surface for repairs along with its importance.
5 M
8(b)
Write short note on
i) Attack by sea water
ii) Carbonation of concrete an its determination.
i) Attack by sea water
ii) Carbonation of concrete an its determination.
8 M
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