Chapter 5 To 7

Question 1

Four types of retaining walls.

Answer 1

Gravity walls, Cantilever Walls, Buttress Walls and Counterfort walls

Question 2

3 conditions before formwork can be removed/striking

Answer 2

Sufficient strength to support itself
Sufficient surface hardness to resist damage
Sufficient curing to give reasonable colour finish to the concrete.

Question 3

4 specific requirements of formwork

Answer 3

Surface finish
Ease of stripping
Good alignment
Ease of placing concrete.

Question 4

Name 2 pressures acting on the retaining wall

Answer 4

Active pressure
Passive pressure

Question 5

2 plants used to transport workers and materials

Answer 5

Lorry & Truck.

Question 6

3 types of contracts to be used in construction project

Answer 6

Lump-sum contracts
Measured contract
Cost-plus contract

Question 7

Three /more types of retaining wall failure mode.

Answer 7

Fracture, Overturning, Sliding/ Displacement, Rotating

Question 8

Explain softening and ozonation in water treatment process

Answer 8

Softening: lime is added to remove perm and temp hardness

Ozonation: Filtered water flows to underground tanks where ozone gas is then injected into the water. The ozone in the water is supposed to act as a disinfectant for odour, taste, smell and other impurities.

Question 9

3 types of culvert that could be propsed to the client

Answer 9

Pipe culvert, RC culvert, Brick Culvert

Question 10

Name types of test for drains

Answer 10

Smoke test, Air/Pneumatic Test, Water test, Alignment test, Gradient Test