Materials 4

100 Questions | Total Attempts: 142

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Material Quizzes & Trivia

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Questions and Answers
  • 1. 
    Scales for weighing aggregates and cement shall be accurate within ___ % throughout the range of use. Scales shall be inspected and sealed as often as the Engineer may deem necessary to assure their continued accuracy.
    • A. 

      1.0%

    • B. 

      1.5%

    • C. 

      0.5%

    • D. 

      2.0%

  • 2. 
    When cement is placed in contact with the aggregate, batches may be rejected unless mixed within ___ hours of such contact.
    • A. 

      1.5 hours

    • B. 

      2.0 hours

    • C. 

      0.5 hours

    • D. 

      2.5 hours

  • 3. 
    When mixed at the site or in a central mixing plant, the mixing time shall not be less than ____ not more than _____ unless mixer performance test prove adequate mixing of concrete in shorter time period.
    • A. 

      30 seconds not more than 90 seconds

    • B. 

      50 seconds nor more than 90 seconds

    • C. 

      60 seconds nor more than 120 seconds

    • D. 

      90 seconds nor more than 120 seconds

  • 4. 
    The flow of water shall be uniform and all water should be in the drum by the end of the first ____ seconds of the mixing period.
    • A. 

      45

    • B. 

      30

    • C. 

      15

    • D. 

      20

  • 5. 
    When concrete is delivered in truck mixers, additional water may be added to the batch and additional mixing performed to increase the slump to meet the specified requirement is permitted by the Engineer, provided all these operation are performed within ___ after the initial mixing operation and the water and cement ratio is not exceeded.
    • A. 

      30 minutes

    • B. 

      15 minutes

    • C. 

      45 minutes

    • D. 

      60 minutes

  • 6. 
    Concrete not place within ___ minutes from the time the ingredients were charged into the mixing drum shall be used
    • A. 

      120 minutes

    • B. 

      150 minutes

    • C. 

      60 minutes

    • D. 

      90 minutes

  • 7. 
    Sample from bituminous mix weighs 1000 grams. At extraction, it was found out that the dry aggregate weighed 950 grams. What is the % of asphalt by weight of mix?
    • A. 

      5.2%

    • B. 

      5.0%

    • C. 

      5.4%

    • D. 

      4.8%

  • 8. 
    The minimum penetration of the preservative with the surface of the timber piles shall be
    • A. 

      150 mm

    • B. 

      200 mm

    • C. 

      250 mm

    • D. 

      100 mm

  • 9. 
    The contractor shall submit in writing a job-mix formula for the mixture supported by laboratory test data along with samples of resources of components and viscocity - temperature relationship to the Engineer for testing and approval at least
    • A. 

      Two weeks

    • B. 

      Three weeks

    • C. 

      One week

    • D. 

      Four weeks

  • 10. 
    The concrete sample should be stored in a moist conditioned temperature within the range of ___ until the time of test.
    • A. 

      18 deg C to 24 deg C

    • B. 

      15 deg C to 18 deg C

    • C. 

      14 deg C to 24 deg C

    • D. 

      18 deg C to 28 deg C

  • 11. 
    This is used in soil stabilized road surface due to iys high ____ property, that is, it absorb the retain water
    • A. 

      Potassium chloride

    • B. 

      Calcium chloride

    • C. 

      Magnesium chloride

    • D. 

      Sodium chloride

  • 12. 
    The mass west of soil aggregate used in cement/lime proportions should not be more than ___. 
    • A. 

      40%

    • B. 

      50%

    • C. 

      45%

    • D. 

      55%

  • 13. 
    The uniform rate at which the movable head of the CBR machine travel is 
    • A. 

      0.05 in/min

    • B. 

      0.10 in/min

    • C. 

      0.08 in/min

    • D. 

      0.09 in/min

  • 14. 
    Castin place concrete shall not bepost - tensioned until at least ____ and until the compressive strenght has reached the strength specified
    • A. 

      7 days

    • B. 

      10 days

    • C. 

      14 days

    • D. 

      20 days

  • 15. 
    The penetration test is an indication of the ___ of asphalt
    • A. 

      Consistency

    • B. 

      Softness

    • C. 

      Hardness

    • D. 

      Flash point

  • 16. 
    Specifications requires one quality test for every ___ of asphalt
    • A. 

      20 tons

    • B. 

      200 tons

    • C. 

      50 tons

    • D. 

      40 tons

  • 17. 
    The ___ is the most commonly used method in the design and evaluation of bituminous concrete mixes
    • A. 

      Job mix formula

    • B. 

      Design mix

    • C. 

      Marshall stability

    • D. 

      Extraction

  • 18. 
    Vibration shall operate a frequency of 8,300 to 9,600 impulse per minute under load at a maximum spacing of
    • A. 

      50 cm

    • B. 

      40 cm

    • C. 

      60 cm

    • D. 

      30 cm

  • 19. 
    The specific gravity of sodium sulfate used in soundness test for aggregates should be within in the range of ___ 
    • A. 

      1.151 to 1.174

    • B. 

      1.250 to 1.178

    • C. 

      1.051 to 1.154

    • D. 

      1.058 to 1.184

  • 20. 
    The specific gravity of magnesium sulfate solution used in soundness test for aggregate should be within the range of ___
    • A. 

      1.280 to 1.408

    • B. 

      1.180 to 1.308

    • C. 

      1.295 to 1.308

    • D. 

      1.195 to 1.318

  • 21. 
    Aggregates accounts for 92-95% of the weight of the bituminous mixture asphalt accounts for 5-8% of the weight of the mix. The exact percentage to be used is determined by the ___
    • A. 

      Trial mix

    • B. 

      Design mix

    • C. 

      Job mix

    • D. 

      Job order

  • 22. 
    ___ is an indication that the asphalt mix is overheated
    • A. 

      Blue smoke

    • B. 

      Stiff appearance

    • C. 

      Rising steam

    • D. 

      Mix slumps in truck

  • 23. 
    In checking the temperature of the mix, the thermometer should be inserted into the mix at least ___
    • A. 

      2"

    • B. 

      6"

    • C. 

      4"

    • D. 

      6 mm

  • 24. 
    The solution used in the soundness test of aggregate shall be cooled to a temperature of 21 + or - 1 deg C maintain at that temperature for at least ___
    • A. 

      24 hours

    • B. 

      36 hours

    • C. 

      48 hours

    • D. 

      18 hours

  • 25. 
    Proper compaction of the fill materials is very important, as it will ___
    • A. 

      Increase the shear strength

    • B. 

      Decrease permeability

    • C. 

      Minimize compressibility

    • D. 

      All of the above