Podcast
Questions and Answers
What is the primary reason for segregation in a concrete mixture?
What is the primary reason for segregation in a concrete mixture?
- Inadequate curing of the concrete after placement
- Insufficient vibration during the mixing process
- Poorly designed concrete mix with low water content
- Differences in the size of particles in the concrete mix (correct)
What is the term for the surface evidence of water rising to the top of freshly placed concrete?
What is the term for the surface evidence of water rising to the top of freshly placed concrete?
- Microcracking
- Segregation
- Laitance (correct)
- Bleeding
What is the primary consequence of bleeding in concrete?
What is the primary consequence of bleeding in concrete?
- Creation of water voids and decreased bond strength (correct)
- Increased bonding between aggregates and paste
- Increased risk of microcracking
- Reduced strength due to a higher water content
What is the primary method for preventing segregation in concrete?
What is the primary method for preventing segregation in concrete?
What is the term for the separation of the constituents from a heterogeneous mixture?
What is the term for the separation of the constituents from a heterogeneous mixture?
What is the primary purpose of adding air entrainment to the mix in fresh concrete?
What is the primary purpose of adding air entrainment to the mix in fresh concrete?
What is the primary factor that affects the strength of hardened concrete?
What is the primary factor that affects the strength of hardened concrete?
What is the primary purpose of reducing the time between placing and start of curing in plastic shrinkage prevention?
What is the primary purpose of reducing the time between placing and start of curing in plastic shrinkage prevention?
What is the primary difference between compressive strength and tensile strength?
What is the primary difference between compressive strength and tensile strength?
What is the primary purpose of measuring the flexural strength of hardened concrete?
What is the primary purpose of measuring the flexural strength of hardened concrete?
