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Questions and Answers
What is the percentage of asphalt by weight of mix if the dry aggregate weighed 950 grams at extraction?
What is the percentage of asphalt by weight of mix if the dry aggregate weighed 950 grams at extraction?
What is the minimum penetration of the preservative with the surface of the timber piles?
What is the minimum penetration of the preservative with the surface of the timber piles?
How many weeks in advance should the contractor submit a job-mix formula for the mixture to the Engineer for testing and approval?
How many weeks in advance should the contractor submit a job-mix formula for the mixture to the Engineer for testing and approval?
What is the temperature range for storing concrete samples until the time of test?
What is the temperature range for storing concrete samples until the time of test?
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Which substance is used in soil stabilized road surface due to its high water absorption and retention property?
Which substance is used in soil stabilized road surface due to its high water absorption and retention property?
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What is the maximum allowed mass percentage wear of soil aggregate used in cement/lime proportions?
What is the maximum allowed mass percentage wear of soil aggregate used in cement/lime proportions?
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What is the uniform rate at which the movable head of the CBR machine tray moves?
What is the uniform rate at which the movable head of the CBR machine tray moves?
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What is the primary purpose of submitting a job-mix formula to the Engineer?
What is the primary purpose of submitting a job-mix formula to the Engineer?
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Why is it essential to store concrete samples in a controlled temperature range?
Why is it essential to store concrete samples in a controlled temperature range?
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What is the significance of the penetration of the preservative with the surface of the timber piles?
What is the significance of the penetration of the preservative with the surface of the timber piles?
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Study Notes
Subgrade Soil and Compaction
- Subgrade soil is well compacted under the controlled condition of optimum moisture content and maximum dry density.
- The percentage of asphalt in the mix is between 3 to 12 mass percent.
Seal Coat Application
- The rate of application of seal coat using cutback asphalt is 1.5-2 li./sq.m.
- The rate of application of seal coat using cutback asphalt can also be 2.0-3.0 li./sq.m.
Defective Works and Project Inspection
- Defective works in a project should be brought to the attention of the contractor by the Project Inspector through a logbook entry, progress billing deduction, inspection report, or site instruction.
- 15% to 50% of the payment is withheld on general items until the final acceptance of the project.
Construction Safety Procedures
- The side of deep excavations must be properly shored.
- All openings above ground level must be guarded.
- Operators and mechanics must be required to log in when operating equipment.
- Workers engaged in clearing must be protected from hazardous plants.
Project Implementation and Delays
- Causes of delay in project implementation include revision in plans, inadequacy of contractor's resources, and non-availability of construction materials.
- Rainy months predetermined in the area are not a cause of delay in project implementation.
Final Inspection and Project Completion
- After the final inspection of a reported 100% accomplished project, a turn-over ceremony is conducted in the field.
- If a project is started more than 8 months after the bidding, the contractor is entitled to claim for price adjustment.
Weather Conditions and Catch-up Plans
- The Philippines has two pronounced seasons, dry from November to April, and wet during the rest of the year.
- The catch-up schedule reflects the accomplishment-duration relationship.
Project Management and Contractor Disputes
- If a contractor continues to disregard agreed project plans and specifications, a recommendation should be prepared for termination of contract.
- If a contractor continues to disregard agreed project plans and specifications, the Project Engineer may also prepare for blacklisting of the contractor.
Materials and Construction
- Excavation of indurated rocks can be undertaken by ripper or bulldozer.
- The Plasticity Index (PI) required for Item 201, Aggregate Base Course materials, should not be greater than 6%.
- For a compacted pavement, the stability value in the Marshall Test measures the resistance to displacement.
Testing and Quality Control
- The flexural strength of concrete is considered satisfactory when the average strength of all sets of 3 consecutive strength test results equal or exceed the specified strength.
- The curve formed on a maximum dry density and optimum moisture content graph is a parabola.
Asphalt and Concrete Mix Design
- The single factor that determines the strength of concrete is the water-cement ratio.
- The design mix for concrete with fc at 28 days of 3500 psi is 4000 psi; 3010 psi; 3489 psi.
- The specific gravity of Portland cement must be 3.15.
Bituminous Concrete Mixes
- The most commonly used method in the design and evaluation of bituminous concrete mixes is the Marshall stability test.
- The role of application of prime coat before asphalt overlaying is to ensure bonding between the asphalt and the existing surface.
Timber Piles and Preservatives
- The minimum penetration of the preservative with the surface of the timber piles shall be 250 mm.
- The contractor shall submit in writing a job-mix formula for the mixture supported by the laboratory test data along with samples of resources of components and viscosity-temperature relationship to the Engineer for testing and approval at least one week.
Concrete Samples and Testing
- The concrete samples should be stored in a moist conditioned temperature within the range of 16C to 27C until the time of test.
- The mass % wear of soil aggregate used in cement/lime proportions should not be more than 45%.
Soil Stabilization
- Calcium Chloride is used in soil stabilized road surface due to its high property, i.e., it absorbs and retains water.
- The uniform rate at which the movable head of CBR machine tray is 0.07 in/min.
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Description
This quiz assesses your understanding of various concepts in civil engineering, including soil properties, compacting conditions, and seal coat application rates.
