Podcast
Questions and Answers
What phenomenon may be caused by overlapping regions in concrete?
What phenomenon may be caused by overlapping regions in concrete?
- Concrete expansion
- Concrete segregation (correct)
- Concrete discoloration
- Concrete solidification
Which of the following is a hazard associated with working in trenches?
Which of the following is a hazard associated with working in trenches?
- Flooding or water accumulation (correct)
- Worker suffocation
- Increased equipment efficiency
- Excessive heat
What may early-stage cracking in concrete be a result of?
What may early-stage cracking in concrete be a result of?
- Excessive aggregate size
- Low temperature curing
- Moisture accumulation
- Too much reinforcement (correct)
Which support system is used for preventing structural movement?
Which support system is used for preventing structural movement?
What does the precast panel solution involve?
What does the precast panel solution involve?
What challenges can arise when using sheet piles?
What challenges can arise when using sheet piles?
Which wall solution is effective for small to moderately high walls?
Which wall solution is effective for small to moderately high walls?
What could excessive reinforcement lead to during construction?
What could excessive reinforcement lead to during construction?
What is the purpose of rock bolts in the attached mesh solution?
What is the purpose of rock bolts in the attached mesh solution?
What is a primary concern when using over-reinforcement in concrete structures?
What is a primary concern when using over-reinforcement in concrete structures?
Flashcards
Concrete segregation
Concrete segregation
Concrete segregation is the separation of the different components in concrete (like aggregates and cement) during construction.
Over-reinforcement
Over-reinforcement
Using more reinforcement steel than needed in concrete structure.
Restrained shrinkage
Restrained shrinkage
Concrete's tendency to shrink is limited when it is surrounded by a structure.
Excavation hazards
Excavation hazards
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Steel truss member
Steel truss member
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Ground anchors
Ground anchors
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Reinforced concrete pile wall
Reinforced concrete pile wall
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Sheet pile wall
Sheet pile wall
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Gabion cage wall
Gabion cage wall
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Precast panels
Precast panels
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Study Notes
Question 1
- Overlapping concrete regions can cause concrete segregation, excessive reinforcement can lead to restrained shrinkage and early-stage cracking. This makes site work harder and can impact concrete pouring quality.
- Working in trenches and excavations is hazardous. Potential hazards include equipment/soil falling, flooding, and workers falling into trenches.
Question 2
- Reinforced concrete pile walls (contiguous and secant) are options.
- Sheet pile walls can be difficult and expensive if driving into rock.
- Gabion cage walls are effective for medium-height walls.
- Attached mesh with vegetation involves steel mesh, rock bolts, and is effective at retaining rock but may have problems supporting soil above.
- Precast panels can be placed in front of excavations, held in place with tie-backs into rock, and increase longitudinal spacing between rock anchors.
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