CITB Construction Methods and Materials 3

Question 1

What is the primary advantage of using fly ash as a partial cement replacement in concrete?

Accepted Answer

It improves workability and reduces heat of hydration

Answer

Fly ash improves concrete workability due to its spherical particles and reduces heat of hydration, lowering the risk of thermal cracking in mass pours.

Question 2

In masonry construction, what is the purpose of a control joint?

Accepted Answer

To allow for planned cracking due to thermal or shrinkage movement

Answer

Control joints are intentional planes of weakness that allow masonry to crack in a controlled, predictable location due to thermal expansion and contraction or shrinkage.

Question 3

Which roofing system uses a continuous membrane adhered or mechanically fastened to the roof deck?

Accepted Answer

Single-ply membrane (TPO/EPDM)

Answer

Single-ply membrane systems like TPO and EPDM consist of a single continuous sheet installed over the roof deck, either adhered, ballasted, or mechanically fastened.

Question 4

What does the term 'pile driving refusal' mean on a construction site?

Accepted Answer

The point at which a pile cannot be driven further because it has reached load-bearing soil or rock

Answer

Refusal occurs when a pile meets resistance so great that it cannot be driven further, typically indicating it has reached adequate bearing capacity.

Question 5

In concrete formwork design, what is the primary factor determining the lateral pressure exerted on vertical forms?

Accepted Answer

The rate of concrete placement and concrete unit weight

Answer

Lateral pressure on formwork increases with faster pour rates and higher concrete unit weight, as the fluid concrete acts hydrostatically before it sets.

(CITB) Construction Industry Training Board Practice Test

(CITB) Construction Industry Training Board Practice Test

CITB Construction Methods and Materials 3