A4- Techniques to Prevent Degradation & Material Failure

Question 1

What are the 5 ways of preventing degradation?
1. G
2. P
3. V
4. S
5. R

Answer 1

Galvanising.
Painting.
Ventilation.
Specialist treatment.
Replacement.

Question 2

What is galvanising?
A __________ coating to _________ moisture and _________________ corrosion.

Answer 2

hot zinc
seal
electrochemical

Question 3

What are 2 examples of treatment?
1.
2.

Answer 3

1. Insecticide.
2. Anti-fungal surface treatment.

Question 4

What are 3 forms of concrete failure?
1.
2.
3.

Answer 4

1. Sulphate attack.
2. Freeze-thaw cracking.
3. Alkali-silica reaction.

Question 5

How may reinforced concrete fail?

Answer 5

Corrosion of steel inside the concrete.

Question 6

What are 2 forms of brickwork failure?
1.
2.

Answer 6

1. Sulphate attack.
2. Freeze-thaw cracking.

Question 7

What are 2 forms of mortar failure?
1.
2.

Answer 7

1. Shrinkage.
2. Freeze-thaw cracking.

Question 8

_______________ timber can be subjected to wet-rot and dry-rot failure.
________________ timber can only be subjected to wet-rot failure.

Answer 8

Internal
External

Question 9

How can the failure of reinforced concrete be prevented:

1. ______________________ of the concrete, to increase its strength and reduce _________.
2. Use _______________ which will prevent the
   reinforcement bars from __________.

Answer 9

Reduce the water content
cracking

galvanised steel
corroding