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SPPU Civil Engineering (Semester 4)
Concrete Technology
May 2017
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

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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:
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
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.
8 M


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