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Questions and Answers
Which type of Portland cement is more resistant to sulfates and generates less heat of hydration?
Which type of Portland cement is more resistant to sulfates and generates less heat of hydration?
In which type of construction is Type II Moderate Portland cement commonly used?
In which type of construction is Type II Moderate Portland cement commonly used?
Which type of Portland cement is designed for early removal of formwork or for cold-weather construction?
Which type of Portland cement is designed for early removal of formwork or for cold-weather construction?
Which type of Portland cement has a reduced content of tricalcium silicate and an increased content of dicalcium silicate?
Which type of Portland cement has a reduced content of tricalcium silicate and an increased content of dicalcium silicate?
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In which type of construction is Type III High Early Strength Portland cement commonly used?
In which type of construction is Type III High Early Strength Portland cement commonly used?
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Study Notes
Concrete Mixture Proportion and Strength
- Minimum required cement content is 40kg (94lbs) for ultimate compressive strength
- Cylinder strength test uses a cylinder with h=2h
- Cube strength test uses a cube with dimensions 150mm x 150mm x 150mm
- Water content is measured in US Gallons per 94lbs (40kg) of cement
Uses and Proportions of Concrete Mixtures
- Pre-Stressed and Post-Tensioned concrete uses AAA mix proportion (1:1:2)
- AA mix proportion (1:1.5:3) has 12% cement, 9.5% sand, 0.5% water, and is used for footings, piers, columns, girders, beams, joists, and slabs
- A mix proportion (1:2:4) has 9% cement, 7% sand, 0.5% water, and is used for footings, piers, columns, girders, beams, joists, and slabs
- B mix proportion (1:2.5:5) has 7.5% cement, 6% sand, 0.5% water, and is used for slabs on fill and non-load bearing walls or 4” CHB
- C mix proportion (1:3:6) has 6% cement, 5% sand, 0.5% water, and is used for concrete plant boxes and parapet walls
- D mix proportion (1:3.5:7) has 5% cement, 4% sand, 0.5% water, and is used for plant boxes, footpaths, walkways, and lean concrete
Classification of Portland Cement
- Portland cement is a hydraulic cement made by burning a mixture of clay and limestone in a rotary kiln and pulverizing the resulting clinker into a very fine powder
- Named for its resemblance to a limestone quarried on the Isle of Portland, England
- Type I is a normal Portland cement used for general construction, having none of the distinguishing qualities of other types
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Description
Test your knowledge of concrete mixture proportions, minimum required cement class proportions, ultimate compressive strength, and uses for different mixtures. This quiz covers various concrete mix ratios and their suitable applications.
