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Questions and Answers
What is concrete made of?
What is concrete made of?
- Sand, water, and cement mixed together
- Cement and various mineral aggregates mixed with water (correct)
- A mixture of gypsum and lime
- Limestone and clay heated to a high temperature
What is the primary ingredient in Portland cement?
What is the primary ingredient in Portland cement?
- Sand and gravel
- Crushed volcanic rock
- A calcined mixture of clay and limestone (correct)
- Gypsum finely pulverized
Which type of Portland cement is used for reduced curing?
Which type of Portland cement is used for reduced curing?
- High Early Strength (correct)
- Low Heat Hydration
- Moderate Sulfate Resistance
- Sulfate Resistant
What does it mean to calcine a substance?
What does it mean to calcine a substance?
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When is Moderate Sulfate Resistance Portland cement used?
When is Moderate Sulfate Resistance Portland cement used?
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Study Notes
Concrete Composition
- Concrete is made of cement, water, aggregates (such as sand, gravel, crushed stone), and sometimes supplementary cementitious materials.
Portland Cement
- Primary ingredient in Portland cement is limestone.
- Type III Portland cement is used for reduced curing time.
Calcination
- Calcining a substance means heating it to a high temperature to remove impurities or achieve a desired chemical reaction.
Moderate Sulfate Resistance
- Moderate Sulfate Resistance Portland cement is used in environments where sulfate attacks on concrete are moderate, such as in soils and groundwater with moderate sulfate content.
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