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Questions and Answers
What are the typical proportions in the 10-20-30-40 Rule for concrete mixture?
What are the typical proportions in the 10-20-30-40 Rule for concrete mixture?
- 10% air and water, 20% cement, 30% gravel, 40% sand
- 10% gravel, 20% sand, 30% cement, 40% air and water
- 10% cement, 20% air and water, 30% sand, 40% gravel (correct)
- 10% sand, 20% gravel, 30% air and water, 40% cement
What did the Bedouins or Nabataea traders learn about the concrete-like mixture around 6500 BC?
What did the Bedouins or Nabataea traders learn about the concrete-like mixture around 6500 BC?
- The mixture must contain a high percentage of groundwater
- The mixture must be exposed to sunlight for a specific duration
- The mixture must be kept as dry as possible (correct)
- The mixture must be constantly stirred while preparing
What material did the ancient Egyptians use to form bricks around 3000 BC?
What material did the ancient Egyptians use to form bricks around 3000 BC?
- Mud mixed with sand
- Clay mixed with water
- Mud mixed with straw (correct)
- Mud mixed with cement
What can silica sand become if it is mixed with groundwater?
What can silica sand become if it is mixed with groundwater?
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What is the primary bonding material in concrete?
What is the primary bonding material in concrete?
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