Reinforcement, Anchoring, and Structural Components
This domain covers dowels, vertical bars in hollow cells, horizontal joint reinforcement, bond beams, lintels, grouting, laps, and cover. The exam tests whether reinforcement is placed, anchored, and inspected before it is buried in mortar or grout.
Core rules
- Follow the structural drawings for bar size, spacing, lap length, and location.
- Clean rebar of loose rust, oil, and mud before placing it.
- Anchor vertical bars into the footing or slab with the specified dowels and embedment.
- Keep vertical bars centred in the hollow cells and grout the cells fully where required.
- Place horizontal reinforcement in bond beams or joint reinforcement as detailed, with correct cover.
- Inspect reinforcement and dowels before grouting or laying over them; record the inspection.
Worked example
A wall is 4.8 m long with vertical bars at 600 mm on centre. Divide 4.8 by 0.6 to get 8 spaces. If bars are required at both ends and at every space, the count is 9 bars. The reasoning is that spacing defines spaces, not bars; the end bars add one. Confirm the count and spacing against the drawing before grouting, because missing one end bar is a common inspection failure.
Traps
- Pushing vertical bars aside so they are not centred in the cell.
- Grouting cells without checking dowels and laps.
- Using a lap length shorter than specified.
- Leaving voids or honeycomb in grouted cells.
Key points
- Follow drawings for bar size, spacing, lap, and cover.
- Clean rebar before placing it.
- Anchor vertical bars with specified dowels.
- Inspect reinforcement before grouting.
- Grout cells fully and avoid voids.