Concrete Technology

b. Briefly explain the effect of fly ash on fresh and hardened concrete.

With the help of the following design stipulations and test data for materials design a M20 grade concrete: a. Design stipulations:

b. Test data for materials:

i) Specific gravity of cement =3.15;

ii) Specific gravity of coarse aggregate = 2.60

iii) Specific gravity of fine aggregate = 2.60;

iv) Water absorption of coarse aggregate = 0.5% ;

v) Water absorption of fine aggregate = 1.0% ;

vi) Free moisture in coarse aggregate = Nil;

vii) Free moisture in fine aggregate = 2.0% ;

viii) Grading of fine aggregate = Zone III

Any missing data may be suitably assumed.

With the help of the following design stipulations and test data for materials design a M20 grade concrete: a. Design stipulations:

i) Characteristic compressive strength at 28 days = 20 N/mm²

ii) Maximum size of aggregate =20 min (angular)

iii) Degree of workability = 0.90 compacting factor

iv) Degree of quality control = good

v) Type of exposure =mild 

Write short notes on the factors affecting the following:

d. Workability

Write short notes on the factors affecting the following:

c. Creep

Write short notes on the factors affecting the following:

b. Shrinkage

Write short notes on the factors affecting the following:

a. Modulus of elasticity 

b. List out any five methods each for controlling sulphate attack and corrosion of steel due to chloride attack 

a. List out any ten factors contributing to cracks in concrete.

b. Discuss any five factors affecting the strength test results.

a Discuss any five factors affecting the strength of concrete.

a. Describe any five field tests that can be done on cement.

a. Explain the flocculation and de-flocculation of cement grains under the influence of superplasticizer, with the help of a diagram 

b. List out any ten methods adopted for transportation of concrete.

a. What is workability? Explain its importance in fresh concrete

a. What is workability? Explain its importance in fresh concrete

a. What is workability? Explain its importance in fresh concrete

a. What is workability? Explain its importance in fresh concrete

b. Mention the maximum impact value for wearing and non-wearing surfaces and also explain how impact test is done for coarse aggregate. 

a. What do you understand by grading analysis? Explain how it is done for fine aggregates.

b. Draw a flow chart for the manufacturing of cement by wet process.