問題一覧
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25. What documentation should be maintained and kept updated by the materials engineer during project implementation?
Materials logbook
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10. It was found out that the degree of compaction of the prepared base is 80% which is below the desired compaction of 100% for the sub-base course. As a materials engineer, what will you suggest?
suggest to add more binder
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17. Quality control testing in the DPWH project is the responsibility of the:
contractor
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13. Given: Volume of sample: 500 cc Weight of the specimen in air: 1200 grams. Calculate the bulk specific gravity of the asphalt specimen.
2.4
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7. The liquid limit is usually :
higher than plastic limit
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19. Economical way of treating an embankment with weak spot.
using geotextile
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34. Concrete curing refers to:
procedures done to promote cement hydration
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30. Beam sampling is taken foe every 75 cubic meters of concrete or ______ sq. m. of concrete pavement.
330
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23. The specification call for a 1:2:4 concrete mix. in a one bagger mixer, which amount of water is most likely required to the mix?
20L
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21. Which of the following is authorized to test materials for use in DPWH projects?
any of DPWH accredited private testing lab with prior clearance from DPWH Implementing Office
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18. Which of the following does not fall under the primary responsibility of the materials engineer?
linear measurement
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31. What is the oven drying temperature for moisture content determination?
110+-5°C
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Concrete with zero slump means that its which ratio is:
Low
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20. In soil exploration, if the characteristics of rock is questionable, the minimum depth of boring into the bedrock should be ______
3.0 m
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35. A set of three(3) beam samples representing a particular section of the concrete pavement failed to meet the flexural strength requirement. As a materials engineer, what would you recommend?
conduct core tests for strength determinatiin on section represented by the failed samples to determine the actual strength of the in placed concrete
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11. If the load applied in unaxial compression test is higher than the prescribed rate of loading, what is its effect in the strength determination of the sample?
strength reading will be higher
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22. The results of Immersion/Compression Test conducted on asphalt mis sample are: Dry Stability = 2000 kPa Wet Stability = 1000 kPa What is the resulting IRS? Does it meet the specification requirement of Item 310?
50% , no
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9. Immersion - Compression test is measure of _________ of asphalt mixes.
stability
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8. When the PI of a soil is zero, it means that:
soil is non plastic
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15. The apparent omission of a detailed description or definition concerning the quality of materials from the plans and specifications shall be regarded to mean that:
materials of first class quality are to be used
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27. If there is a necessity for increasing the water content of concrete intended for structures for better workability, which of the following must be undertaken?
mixture should be redesigned
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Unconfined compressive strength test is usually performed on
clayey
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29. The minimum moisture content at which soil can be rolled into a thread 1/8'' in a diameter without breaking is known as ____.
plastic limit
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What is the maximum allowable temperature of asphalt mix prior to spreading?
107°C (225°F) , Tolerance = +-10°C
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33. The optimum moisture content of soil is determined during
any of the above
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24. Undersized reinforcing steel bars that satisfy the tensile and elongation requirements may be accepted provided that its underweight does not exceed?
6%
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The bulk specific gravity of a bituminous mix is 2.342 and the dry stability is 3000 lbs. What is the IRS if its wet stability is 2400 lbs.?
80
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14. What is not the most commonly accepted measure of the hardness of aggregates?
Petrographic Test
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5. Asphalt Construction, compaction must be completed before the mixture cools to:
185°F(71°C)
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26. Minimum tensile strength of tendons.
270,000 psi
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12. Emulsified asphalt when mixed to aggregates turns from chocolate brown to what color?
black
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16. Who take samples of materials and bring them to the lab for testing?
contractors materials engineer
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28. How many are needed foe thickness determination of concrete cores?
9
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6. In Nuclear density test, what is not required?
operator must wear protective gear
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32. One rule of thumb is consider all _______ colored concrete as damaged, and to be removed
light brown