Load Independent deformation

Question 1

types of shrinkages

Answer 1

Plastic, autogenous, drying, Carbonation

Question 2

what is plastic shrinkage

Answer 2

Due to settlement of solids and the loss of free water

Question 3

What does plastic shrinkage cause, why and how to prevent it?

Answer 3

Causes cracking, by water evaporation, prevented by curing, polythene, spraying and membrane.

Question 4

What does plastic shrinkage cause and how to prevent it?

Answer 4

Causes cracking, prevented by increasing concretes stability.

Question 5

What is autogenous shrinkage?

Answer 5

Self produced shrinkage due to consumption of water during hydration.

Question 6

what factors influence autogeneous shrinkage?

Answer 6

Cement chemical composition, cement content, initial water content, temperature b

Question 7

What is drying shrinkage?

Answer 7

due to loss of water from cement gel

Question 8

what is carbonation shrinkage?

Answer 8

Hardened cement paste reacts with CO2 over a large period of time. (it is irreversible)

Question 9

Types of expansion.

Answer 9

Thermal expansion, Wetting expansion (self explanatory)

Question 10

What is crack control?

Answer 10

refers to use of reinforcement to control cracking resulting from shrinkage and contraction.