18 Questions
What is the expected grade/strength of infill concrete in a reinforced cavity wall?
15 MPa
Can you use cement bricks to lift the surface bed rebar/mesh as long as the bricks are cut in half?
True
Within what duration should mortar be used after mixing?
1 Hour
What should be done with mortar in which initial set has occurred (i.e., thumbprint hard)?
Used within two hours of mixing
By how much should a masonry wall not overhang the concrete slab of raft foundations?
30mm
Which of the following bricks should be wetted before placed?
Concrete bricks
What should the grading of mortar be in hollow bricks used for cavity wall foundations?
1.0 Mpa & 10.0 Mpa
What is the average compressive strength of the hollow and solid masonry units required for single storey buildings?
7.0 MPa and 10.0 MPa
What is the average compressive strength of the hollow and solid masonry units required for the lower storey in double storey buildings?
3.0 MPa and 7.0 MPa
What is the average compressive strength for the solid masonry units for a double storey construction?
15 MPa
What is the minimum difference in ground levels (h) for a 110-110 cavity retaining wall?
1200 mm
What is the maximum height of a masonry foundation wall where the fill is retained behind a 220mm nominal wall thickness?
The text does not specify a maximum height for this scenario.
What is the recommended minimum compressive strength for concrete infill in cavity wall construction?
20 MPa
Which type of mortar is typically used for laying masonry units in wall construction?
Cement mortar
Can cement bricks be used as a substitute for lifting bed reinforcement in masonry wall construction?
No, steel reinforcement is mandatory and cannot be substituted.
What is the maximum size of rock or hard fragments allowed in backfill material for masonry wall construction?
50 mm
What is the minimum horizontal spacing requirement between a water pipe and a sewer line when laid underground?
600 mm
What is the recommended minimum slab thickness for a non-load-bearing masonry wall?
250 mm
Test your knowledge on reinforced cavity wall construction with this quiz. Questions cover topics such as expected grade/strength of infill concrete, use of cement bricks, and mortar usage. Answer options include multiple choice as well as options available exclusively to clients.
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