10 Questions
What is the purpose of using ACI 211.1 Standard Practice in concrete construction?
To select proportions for concrete mixtures
How long is PCCP designed to last when constructed with good concrete?
20 years
What is a key reason why a good asphalt road is preferable to a good cement concrete road?
Lower initial cost
Which of the following is NOT one of the five basic requisites of road building as mentioned in the text?
Traffic Control
What is a key difference between quality control in asphalt pavement construction and other structures?
Testing requirements are based on program of works in other structures
Which type of testing is specifically NOT mentioned as a quality control measure in the text?
Shear testing
What happens when there is little or no quality control exercised in concrete construction?
Defective concrete will result
Why is good asphalt preferred over good cement concrete according to the text?
'more uniform riding surface'
What aspect of road building is NOT explicitly mentioned as one of the five basic requisites?
'Traffic Control'
What makes good asphalt road preferable over good cement concrete road according to the text?
Lower initial cost
Study Notes
Concrete Mixer
- A device that combines cement, aggregate (sand/gravel), and water to form concrete.
- Typically uses a revolving drum to mix the components.
Quality Control Procedures
- Selection of materials
- Handling and storage of materials
- Sampling and testing of materials
- Proper construction methods
- Inspection and project monitoring
Selection of Materials
- Raw materials (soil, sand, bank/river gravel)
- Processed materials (washed/manufactured sand, crushed rock/gravel)
- Manufactured materials (bituminous materials, cement, paint, structural reinforcing steel bar)
- Combination of materials (bituminous & Portland cement concrete)
Laboratory Equipment
Graduated Beaker
- A cylindrical container with a flat bottom, used in laboratory equipment.
Slump Cone
- A metal mold in the form of a truncated cone, used for concrete slump testing.
- Measures the workability of fresh concrete.
Workability of Concrete
- Affected by consistency (wetter mixes are more workable than drier mixes).
- Concrete of the same consistency may vary in workability.
Molds in Material Testing Lab
- Three types of molds used for preparing concrete specimens:
- Cube Molds (150mmx150mmx150mm, 100mmx100mmx100mm, 70.6mmx70.6mmx70.6mm)
- Cylinder Molds (6x12 in., 4x8 in.)
- Beam Molds (100x100x400 mm, 100x100x500 mm, 150x150x600mm)
Keys in Quality Control
- Owner: responsible for work to be done
- Implementer: responsible for work to be constructed
- Quality: ensures works are at performance level
Universal Testing Machine
- Used to test mechanical properties (tension, compression, etc.) of a test specimen.
- Exerts tensile, compressive, or transverse stresses.
Test your knowledge about concrete mixers, devices commonly used to combine cement, aggregate, and water to form concrete. Learn about the different types of mixers and their components such as the revolving drum.
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