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Questions and Answers
What is the maximum size of aggregate in concrete mixes?
What is the minimum concrete cover required for reinforcing steel directly against earth?
How many days should the forms and shores be left in place for suspended slab construction?
What is the minimum concrete protection required for reinforcement in footings deposited in the ground?
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What is the yield strength of the reinforcing steel bars specified in the notes?
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What is the minimum clearance required for slab reinforcements from the bottom and top of the slab?
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What is the maximum spacing of bars at the column strips in concrete slabs?
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What is the minimum distance required between construction joints in bedded slabs?
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What is the additional requirement for tied column reinforcement above and below beam-column connections?
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What is the minimum depth required for footings below the natural grade line?
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Study Notes
Concrete Mixes and Placing
- Maximum size aggregate is 20mm with a maximum concrete slump of 100mm
- Minimum concrete cover for reinforcing steel:
- Directly against earth: 75mm
- Suspended slab: 20mm
- Slab on grade: 40mm
- Minimum days for stripping of forms and shores:
- Foundation: 1 day
- Suspended slab: 8 days
- Beams: 14 days
- Walls and columns: 21 days
- Contractor must submit pouring schedule and construction joint locations to the structural engineer at least 4 days prior to pouring for approval
Footings
- Footings are designed for an allowance soil bearing pressure of 96 kPa (2000psf)
- Footings shall rest at least 1.50m below natural grade line
- Minimum concrete protection for reinforcement: 75mm clear for concrete deposited in the ground and 50mm for concrete deposited against a formwork
Reinforcements
- Yield strength of reinforcing steel bars: 414 MPa or 60,000 psi
- Re-bars sizes 10mm or larger shall be deformed, and smaller than 10mm may be plain
Concrete Slabs
- All slab reinforcements shall be 20mm clear minimum from the bottom and top of the slab
- Spacing of bars at column strips shall not be more than 1% slab thickness
- Bedded slabs shall be reinforced with 10mm @ 250mm O.C each way to the center of the slab, and construction joints shall be at least 3.65m apart
Columns
- Provide extra sets of ties at 100 O.C for tied column reinforcement above and below beam-column connections
- Column ties shall be protected everywhere by a covering of concrete cast slope monolithically with the core with a minimum thickness of 40mm and not less than 40 times MSA
- Alternate bars shall be welded or mechanically spliced at any level, with vertical distances between welds or splices of adjacent bars not less than 600mm
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Description
This quiz covers the requirements for concrete mixes, placing, and construction, including maximum aggregate size, concrete slump, and minimum concrete cover for reinforcing steel. It also covers the minimum days for stripping of forms and shores for different structures.
