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Identify Concrete Defects (Continuing Education)

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Identify Concrete Defects

1. 
If a concrete mix is vibrated adequately and finish trowelling begins after the all the bleed water has evaporated you will avoid the majority of concrete defects.
  1. True
  2. False
2. 
Formwork needs to be checked prior to placing concrete. Formwork failure during the placing of concrete can cause superficial defects, and will not affect the structure of the concrete being poured.
  1. True
  2. False
3. 
To avoid defects when placing concrete slabs allow all of the                  water to evaporate prior to the final finishing of the slab.
4. 
This type of defect happens when the concrete mix is poured between rebar. The concrete paste sticks to the rebar on the way to the bottom of the form leaving only the large aggregate at the bottom. Proper vibration of the mix will prevent this from happening.
  1. Honeycombing
  2. Scaling
  3. Spalling
  4. Crazing
5. 
This type of concrete defect is common and is caused by dissolved salts being in the water of the concrete mix. It looks like a white powdery substance is coming out of the exposed concrete.
  1. Scaling
  2. Efflorescence
  3. Flaking
  4. Crazing
6. 
What is done to a below grade concrete foundation wall that is susceptible to hydrostatic pressure? Prolonged hydrostatic pressure can cause water intrusion, and additional defects in the concrete foundation.
  1. Finish trowling
  2. Parging
  3. Waterproofing
  4. Screeding
7. 
This concrete defect causes the finished concrete to show minor surface cracks. It is generally cause by working the bleed water back into the concrete mix when finishing.
  1. Scaling
  2. Cracking
  3. Honeycombing
  4. Crazing
8. 
After a form is removed pieces of concrete chip off around window openings and edges. This happens when the form is removed prior to it having enough strength to resist the stresses of the form stripping. What is this defect called?
  1. Spalling
  2. Scaling
  3. Honeycombing
  4. Chipping
9. 
This concrete defect causes flakes of concrete to fall off the surface of the concrete. It happens when the surface concrete did not cure properly.
  1. Scaling
  2. Coursing
  3. Dusting
  4. Crazing
10. 
Although unsightly, discoloration of the concrete finish does not indicate a sign of the wall being weakened structurally.
  1. True
  2. False

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