Cochin University of Science and Techology (CUST) 2002 B.Tech Civil Engineering Concrete Technology - Question Paper

I.

(a)

What are the chemical compounds that form portland cement ? Explain the function

of each compound.

(10)

(b)

List the advantages of expansive cement. Give two applications where expansive

cement is used.

(5)

(c)

What is masonary cement ? What are its properties ?

(5)

OR

n.

(a)

Explain with neat figures the method of determining the initial and final setting times

of cement.

(10)

(b)

What is heat of hydration ?

(5)

(c)

What is sulphate resisting cement ? Give its applications.

(5)

in.

(a)

Explain flakiness and elongation index. How does it affect the properties of fresh

concrete?

(6)

(b)

Explain the method of determination of aggregate crushing value.

(8)

(c)

Can you use sea water for mixing concrete ? What are its effects on strength and

durability ?

(6)

OR

IV.

(a)

What do you mean by bulking ? How does it affect the batching of concrete ?

How can you overcome the effect of bulking ?

(10)

(b)

What are the requirement of water to be used for mixing concrete ?

(5)

(c)

Explain the terms

(i) Fineness modulus

(ii) Grading of aggregates.

(5)

V.

(a)

What are the different methods adopted for under water concreting ? Explain any one

method in detail.

(8)

(b)

What are the damp-proofing and permeability reducing agents commonly used

with cement?

(6)

(c)

Explain the term grouting. What are the essential properties required for grout ?

What admixtures can be used to achieve this ?

(6)

OR

VI.

Write short Notes on :

(i) Workability agents (ii) Gas Forming agents

(iii) Colouring agents (iv) Air detraining agents. (4x5

= 20)

vn.

(a)

What is workability ? What are the factors affecting workability ?

(6)

(b)

Explain with neat figures the equipments used for compaction of concrete.

(8)

(c)

What is curing ? Explain the different methods of curing.

(6)

OR

Vm.

(a)

Explain the method of determination of the modulus of elasticity of concrete using the

compressometer.

(10)

0>)

Differentiate between segregation, bleeding and laitance.

(5)

(c)

Explain the split tensile strength test.

(5)

IX.

(a)

What do you mean by characteristic strength of concrete ?

(5)

(b)

Explain the different steps in the method recommended by Indian standards for

mix design.

(10)

(c)

What are the advantages and disadvantages of ready-mixed concrete?

(5)

OR

X.

Write short notes on :