Mixing and Testing Concrete Review Questions
Review Questions
- Explain the term “water/cement (w/c) ratio”
- What does a W/C ratio of 0.55 mean?
- What are the three considerations to make when choosing concrete design?
- True or False:
- Portland cement is a brand name.
- Color is the only difference between white and grey cement.
- Aggregates should not exceed 1/3 the depth of non-reinforced slabs on grade.
- There is little advantage in mixing concrete more than three minutes.
- The most economical mix is obtained using the largest coarse aggregate possible.
- In order to obtain a W/C ratio of 0.50, how much water should be added to half a bag of cement? (1 bag cement = 40 kg)
- What is the proper method for taking a sample of fresh concrete from a concrete truck when it arrives at a jobsite?
- Is concrete with a 75 mm slump wetter or drier than concrete with a 100 mm slump? Which is “higher slump”?