Podcast
Questions and Answers
What is the freezing point of pure water?
What is the freezing point of pure water?
- 9% volume increase
- 0 degrees Celsius (correct)
- Inversely related to pore size
- Below 0 degrees Celsius
Why does water within concrete capillary pores freeze below 0 degrees Celsius?
Why does water within concrete capillary pores freeze below 0 degrees Celsius?
- Due to the capillary pores shrinking
- Thermodynamic imbalance with gel water
- Gel pores allowing ice formation
- Because of the presence of dissolved substances (correct)
What happens when ice forms and expands within concrete capillary pores?
What happens when ice forms and expands within concrete capillary pores?
- Capillary pores shrink in size
- Gel water becomes unfrozen
- Water pressure decreases
- Unfrozen water experiences hydraulic pressure (correct)
How does the freezing point of water relate to the size of capillary pores in concrete?
How does the freezing point of water relate to the size of capillary pores in concrete?
Why do freeze and thaw cracks occur in concrete?
Why do freeze and thaw cracks occur in concrete?
What is the main cause of internal stresses and damage in concrete during freeze-thaw cycles?
What is the main cause of internal stresses and damage in concrete during freeze-thaw cycles?
What can happen if concrete is subjected to repeated freeze-thaw cycles?
What can happen if concrete is subjected to repeated freeze-thaw cycles?
Why is it important for concrete to reach a compressive strength of 3.5 MPa (500 psi) within 24 hours after mixing?
Why is it important for concrete to reach a compressive strength of 3.5 MPa (500 psi) within 24 hours after mixing?
What role does air-entrained concrete play in resisting early freezing?
What role does air-entrained concrete play in resisting early freezing?
What happens to the aggregate in pavement that leads to D-cracking?
What happens to the aggregate in pavement that leads to D-cracking?
What is the Frost Action deterioration mechanism known as D-cracking characterized by?
What is the Frost Action deterioration mechanism known as D-cracking characterized by?
Why does only a portion of the pore water in cement paste freeze at very low temperatures?
Why does only a portion of the pore water in cement paste freeze at very low temperatures?
