Podcast
Questions and Answers
What does the standard penetration test (SPT) measure?
What does the standard penetration test (SPT) measure?
Which bituminous material is best for sealing weakened plane joints?
Which bituminous material is best for sealing weakened plane joints?
What is the main problem associated with improper concrete conveying practices?
What is the main problem associated with improper concrete conveying practices?
For a 1:2:4 concrete mix in a one bagger mixer, what amount of water is typically required?
For a 1:2:4 concrete mix in a one bagger mixer, what amount of water is typically required?
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How many layers should the subbase and base courses be spread and compacted over a 4.5-meter width if the subbase thickness is 125mm?
How many layers should the subbase and base courses be spread and compacted over a 4.5-meter width if the subbase thickness is 125mm?
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What area is recommended to check the suitability of materials for Bituminous Concrete Surface Course?
What area is recommended to check the suitability of materials for Bituminous Concrete Surface Course?
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Based on minimum testing requirements, how many grading and plasticity tests are needed for 7500 cu.m of materials?
Based on minimum testing requirements, how many grading and plasticity tests are needed for 7500 cu.m of materials?
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What percentage of asphalt by weight is typically found in bituminous concrete mixes?
What percentage of asphalt by weight is typically found in bituminous concrete mixes?
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What is the Index of Retained Strength (IRS) when wet stability is 1,000 Kpa and dry stability is 2,000 Kpa?
What is the Index of Retained Strength (IRS) when wet stability is 1,000 Kpa and dry stability is 2,000 Kpa?
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Who is responsible for quality control testing in a DPWH project?
Who is responsible for quality control testing in a DPWH project?
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When should sampling and testing of aggregate materials start?
When should sampling and testing of aggregate materials start?
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What does a spot test on asphalt primarily determine?
What does a spot test on asphalt primarily determine?
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Under what climatic condition is lower penetration grade or hard asphalt recommended?
Under what climatic condition is lower penetration grade or hard asphalt recommended?
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Sampling of freshly mixed concrete should be done at which point during transit mixer discharge?
Sampling of freshly mixed concrete should be done at which point during transit mixer discharge?
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What method is recommended for stabilizing soft and unstable soils before constructing a subbase course?
What method is recommended for stabilizing soft and unstable soils before constructing a subbase course?
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What is the basis for the acceptance or rejection of construction materials?
What is the basis for the acceptance or rejection of construction materials?
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What is the maximum liquid limit for the fraction passing the 0.425mm sieve for Item 200?
What is the maximum liquid limit for the fraction passing the 0.425mm sieve for Item 200?
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For Item 201, what is the maximum plasticity index allowed for the fraction passing the 0.425mm sieve?
For Item 201, what is the maximum plasticity index allowed for the fraction passing the 0.425mm sieve?
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What is the required minimum CBR value for materials passing the 19mm sieve for Item 202?
What is the required minimum CBR value for materials passing the 19mm sieve for Item 202?
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What is the permissible mass percent of wear for the coarse portion retained on a 2.00mm sieve for Item 201?
What is the permissible mass percent of wear for the coarse portion retained on a 2.00mm sieve for Item 201?
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Which method is most commonly used in the design and evaluation of bituminous concrete mixes?
Which method is most commonly used in the design and evaluation of bituminous concrete mixes?
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What is the purpose of an asphalt leveling course?
What is the purpose of an asphalt leveling course?
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For the fraction passing the 0.425mm sieve, what is the maximum liquid limit for Item 104?
For the fraction passing the 0.425mm sieve, what is the maximum liquid limit for Item 104?
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What is the maximum percent mass wear allowed by the Los Angeles Abrasion Tests for the coarse portion retained on a 2.00mm sieve for Item 202?
What is the maximum percent mass wear allowed by the Los Angeles Abrasion Tests for the coarse portion retained on a 2.00mm sieve for Item 202?
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What is the required minimum mass percent of the density for a compacted specimen according to the specifications?
What is the required minimum mass percent of the density for a compacted specimen according to the specifications?
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What is the minimum dimension for a sample cut from a compacted bituminous mix?
What is the minimum dimension for a sample cut from a compacted bituminous mix?
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Which method is the most common for determining the density of soil in place according to DPWH?
Which method is the most common for determining the density of soil in place according to DPWH?
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What is the minimum mass of a field sample required for testing asphaltic materials?
What is the minimum mass of a field sample required for testing asphaltic materials?
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If the maximum size of particles is 50mm, what is the minimum sample mass for moisture content determination?
If the maximum size of particles is 50mm, what is the minimum sample mass for moisture content determination?
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What is the minimum mass of a field sample for coarse aggregates with a maximum nominal size of 50mm?
What is the minimum mass of a field sample for coarse aggregates with a maximum nominal size of 50mm?
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What is the equivalent yield strength of a grade 60 steel bar in PSI if its strength is 414 MPa?
What is the equivalent yield strength of a grade 60 steel bar in PSI if its strength is 414 MPa?
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What is the minimum mass of yield samples required for coarse aggregates with a maximum nominal size of 75mm?
What is the minimum mass of yield samples required for coarse aggregates with a maximum nominal size of 75mm?
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Which type of emulsion works better with wet aggregates?
Which type of emulsion works better with wet aggregates?
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What primary factor influences the grade of asphalt selected?
What primary factor influences the grade of asphalt selected?
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What is the minimum dry compressive strength of an asphalt mixture?
What is the minimum dry compressive strength of an asphalt mixture?
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How many weeks before asphalt production must the job-mix formula be submitted?
How many weeks before asphalt production must the job-mix formula be submitted?
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What method is most commonly used for the design and evaluation of bituminous concrete mixes?
What method is most commonly used for the design and evaluation of bituminous concrete mixes?
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Which of the following is NOT a provision contained in the job-mix formula?
Which of the following is NOT a provision contained in the job-mix formula?
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What is the Index of Retained Strength minimum percentage required for the mixture?
What is the Index of Retained Strength minimum percentage required for the mixture?
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What is a major component of quality control for asphalt mixture production?
What is a major component of quality control for asphalt mixture production?
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How many culvert pipes should be subjected to test if a concrete cylinder is not available for 300 pcs?
How many culvert pipes should be subjected to test if a concrete cylinder is not available for 300 pcs?
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What test requires calibrated sand to determine the volume of a hole?
What test requires calibrated sand to determine the volume of a hole?
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What is the weight percentage of aggregates in a Bituminous Concrete Surface Course?
What is the weight percentage of aggregates in a Bituminous Concrete Surface Course?
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Which test uses a rammer and mold?
Which test uses a rammer and mold?
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What is the penetration grade range of Blown Asphalt?
What is the penetration grade range of Blown Asphalt?
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What is the appropriate maximum time for adding water to a concrete mix after initial mixing?
What is the appropriate maximum time for adding water to a concrete mix after initial mixing?
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Which of the following is a type of solvent used for cutback asphalt?
Which of the following is a type of solvent used for cutback asphalt?
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What are the two types of bitumen commonly used in Bituminous Concrete Surface Course?
What are the two types of bitumen commonly used in Bituminous Concrete Surface Course?
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Study Notes
Materials Engineers Review Notes - Set One
- The standard penetration test (SPT) measures the depth of a soil layer.
- Joint filler asphalt (hard asphalt or blown asphalt) is best for sealing weakened plane joints.
- Segregation is the main problem associated with improper concrete conveying.
- Specifications for a 1:2:4 concrete mix typically require 20 liters of water in a one-bagger mixer.
- A one-lane road, with 3.5m pavement width and 0.5m shoulders on each side, with a combined sub-base and base course of 300mm (sub-base 125mm), should be divided into 3 layers spread and compacted.
- A suitable area of 500 sq.m. is recommended to check the suitability of the materials and efficiency of equipment for Item 310 Bituminous Concrete Surface Course.
- 25 grading and 25 plasticity tests are required for a 7,500 cu.m. volume of Item 201 materials, based on DPWH minimum requirements.
- Bituminous concrete mixes typically contain 5 to 8% asphalt by weight.
- Quality of factory-produced reinforced concrete pipes is best established through testing of concrete pipe samples.
Materials Engineers Review Notes - Set Two
- The standard penetration test (SPT) measures soil layer depth.
- Joint filler asphalt is best for weakened plane joints.
- Segregation is the main problem associated with wrong concrete conveying practices.
- A 1:2:4 concrete mix typically requires 20 liters water in a one-bagger mixer.
- A one-lane road with 3.5m width and 0.5m shoulders each side, with a combined 300mm subbase/base, should have 3 layers over the 4.5m width during spreading and compaction of subbase/base courses.
- A 500 sq.m. trial area is recommended to check the suitability of materials and equipment efficiency for Item 310 Bituminous Concrete Surface Course.
- A 7500 cu.m. of Item 201 materials needs 25 grading tests and 25 plasticity tests, based on DPWH guidelines.
- Bituminous concrete mixes typically contain 5 to 8% asphalt by weight.
- The quality of factory-produced reinforced concrete pipes is best established by testing concrete pipe samples.
- Additional cores for pavement deficiency are taken at 5m intervals parallel to the centerline, from the affected location.
- The immersion-compression test results for asphalt mix (Dry Stability = 2,000 kPa, Wet Stability = 1,000 kPa) yield an Index of Retained Strength (IRS) of 50%. This does not meet the Item 310 specification (70% minimum).
Materials Engineers Review Notes - Set Three
- Item 310 (Bituminous Concrete Surface Course, Hot Laid) comprises aggregates, mineral filler, and bituminous material.
- The aggregate (coarse, fine, and mineral filler) content of the mixture is 92-95%.
- The asphalt content of the bituminous mixture is 5-8%.
- Job-mix formula is used to determine the exact asphalt percentage.
- Tar and petroleum asphalt are bituminous materials commonly used in bituminous concrete surface courses.
- Asphalt cement is the most common petroleum asphalt, available in different penetration grades.
- Cutback asphalt is a mixture of asphalt and solvents, emulsified asphalt is asphalt and water with an emulsifying agent.
Materials Engineers Review Notes - Set Four
- A nuclear density gauge (NDG) is a radioactive material-containing device used to control earth and asphalt road construction.
- A "pundit" ultrasonic concrete tester is a non-destructive device used to inspect concrete and asphalt pavements.
- A Benkelman Beam and Deflection Logger is used to measure pavement deflections.
- A MERLIN Road Roughness Measuring Device is used to measure road surface profiles.
- A rebar locator helps to pinpoint embedded metal within concrete.
- The Falling Weight Deflectometer (FWD) measures differential deflections between pavement joints, determines existing modulus, & estimates life of pavement.
- Dynamic Cone Penetration (DCP) is used for measuring the structural properties of unbound granular materials.
- Test piling is the method used to determine casting lengths of regular piles in bridge construction.
- If concrete pavement surface shows 15mm high spots in a 3m straightedge, those spots should be replaced.
Materials Engineers Review Notes - Set Five
- No specific notes.
Materials Engineers Review Notes - Set Six
- Portland cement concrete pavement (PCCP) is Item 311.
- Concrete cores meeting 85% of the specified strength are considered adequate.
- Lumber is considered seasoned if the moisture content is 12-18%.
- Soils can be classified based on grain size and plasticity.
- 5 cores per lane are typically taken for a 1km PCCP pavement thickness determination.
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Description
This quiz covers key concepts related to civil engineering materials and testing procedures. Topics include the standard penetration test, bituminous materials, concrete mixing ratios, and quality control in construction projects. Ideal for students and professionals in civil engineering.
