building construction Paper 2 WASSCE (SC), 2018

Question 3

 

(a)        State three desirable properties of hardened concrete.

(b)        State three functions of an internal wall.

(i)Explain the reason for providing a landing in stair construction.

Observation

 

Majority of the candidates were able to:

  •  state three desirable properties of hardened concrete.
  • state three functions of an internal wall.

 

However, majority of them failed to explain the reasons for providing a landing in a stair construction.
The expected response to question 3 is as given below:
(a) Desirable properties of hardened concrete:

  • should be  durable;
  • should be  of the required strength;
  • should be  of the correct density;
  • should be  impermeable to water;
  • should be  resistant to friction;
  • should be  free from shrinkage cracks;
  • should be able to withstand fire;
  • should resist indentation.

 

(b)        Functions of an internal wall:

  • to assist in carrying the loads imposed on the structure;
  • to divide space;
  • to provide sound  insulation;
  • to resist the spread of fire;
  • to provide security;
  • to support fixtures, fittings and decorations;
  • to accommodate services.

(c)        Reason for providing landing in a stair construction:
-           to allow for change of direction;
-           to provide an access for rest.
-           to limit the distance someone is likely to fall.
-           to break up the span.
-           to permit safe passage on the flight of stairs.