REVIEW QUESTIONS 25. What is the moisture content of the soil having an original weight of
162.5 grams and an oven – dried weight of 138.2 grams?
1. What is the sample for compressive strength determination of a Answer: 17.58%
structural concrete?
Answer: concrete cylinder sample 26. If the group index of a soil is high, what indication does it mean?
Answer: the soil is clayey
2. What is the test to determine the consistency of concrete?
Answer: Slump test 27. As a Materials Engineer, how can you determine that the sample placed
in the oven is already oven – dried?
3. What is the length required for RSB sample for quality test? Answer: if the sample reaches its constant weight
Answer: 1.0 m/10,000kg/size/shipment
28. In oven drying a sample for test, what temperature shall be
4. How many samples should be taken for every 75 cu.m fresh maintained?
concrete? Answer: 110 ± 5°C
Answer: 1 set consist of 3-pcs sample
29. Why is it that cooling an oven dried sample before weighing is
5. What is the required size of test specimen for G.I. sheets? advisable?
Answer: 3 pcs-60mm x 60mm in 1 sht/100shts Answer: because it can affect its weight
6. What kind of paint that has a reflectance or beads?
Answer: Reflectorized paint 30. What is the difference between hygroscopic moisture content from
natural moisture content?
7. What is that construction material that has a property of being a dark Answer: HYGROSCOPIC MOISTURE CONTENT is the moisture
brown to black cementitious material in which the predominating content of an air – dried sample while NATURAL MOISTURE
substance is bitumen? CONTENT is the moisture content of the original sample from
Answer: asphalt the field.
8. For how long or how many hours shall a bituminous prime coat be 31. For how many bags of cement does a 10 kgs sample arepresents?
left undisturbed? Answer: 2000 bags
Answer: 24 hours
32. For 15, 000 kgs RSB, how many samples shall be submitted for Quality
9. What is the rate of application of bituminous tack coat? Test?
Answer: 0.2 to 0.7 L/sq. m Answer: 2 pcs – 1 m sample
10. What is the penetration grade of blown asphalt? 33. An admixture is being introduced to the fresh concrete mixture for
Answer: 0 to 30 penetration grade heavily reinforced concrete structure using a pump Crete to pump
out the fresh concrete mix, what admixture should it be?
11. What kind of sample is taken for flexural test? Answer: Super plasticizer
Answer: concrete beam sample
34. What is the use of blown asphalt?
12. What are the tests needed for the 2.650 cu.m Item 201 (Aggregate Answer: as joint filler and water proofing
Base Course)?
Answer: CBR, abrasion, GPCD 35. What asphalt is commonly known as hot asphalt or penetration grade
asphalt?
13. How many grading tests are required for a 3,200 cu.m selected borrow Answer: Asphalt Cement
topping (Item 104)?
Answer: 3 grading tests 36. How many days does the sample for Immersion – Compression Test be
soaked in water?
14. As a materials Engineer, what will you recommend if you find out that Answer: 4 days @ 50°C
the materials to be used as Item 200 if finer than the required
materials? 37. If ductility test is for asphalt, _____ is for cement?
Answer: blend Item 200 with coarser materials Answer: Magnesium Oxide, Insoluble Residue, Loss on
Ignition
15. What is the standard specification for LL
and PI of Item 201? 38. Paint is composed of _____
Answer: maximum of 25% and Answer: 35% vehicle, 50% pigment, 15% beads
maximum of 6% respectively
16. What is the CBR requirement for Item 39. What is the size of tamping rod used in tamping concrete sample?
201? Answer: 16 mm Ø and 610 mm long with hemispherical tip
Answer: 80% maximum
40. What is the temperature to be maintained when curing sample after its
17. What asphalt is used for sealing weaken initial curing?
plane joint of concrete pavement? Answer: 23°C ± 1.7°C
Answer: Blown Asphalt
41. Concrete cylinders are cured and ready for test. Temperature between
18. What is Item 311 of the DPWH 63°F to 85°F are permitted for a period not to exceed _____ hours
Specification (Blue Book)? immediately prior to test if free moisture is maintained on the surface
Answer: Portland Cement Concrete of the specimen at all times.
Pavement Answer: three (3)
19. What is the machine used for abrasion 42. The molds of specimen not to be transported shall be removed after
test? initial curing of _____ hours and should be cured to the standard
Answer: Los Angeles Abrasion curing temperature of 73.4 °F ± 3°F
Machine Answer: Twenty – four (24)
20. How to determine the degree of 43. High plasticity index means _____ of a soil?
compaction of Items 104, 200, & 201? Answer: high degree of compressibility
Answer: by Field Density Test
44. Sample to be used for liquid limit and plastic limit tests should pass to
21. What is the formula in obtaining the what sieve?
value of PI? Answer: No. 40 (0.425 mm)
Answer: Liquid Limit minus Plastic
Limit 45. What compaction rammer shall used if the specs given for Moisture –
Density Relation Test (MDR) is T – 180?
22. What are the other terms for sieve Answer: 4.54 kg with 457 mm drop
analysis?
Answer: Grading Test, Particle Size 46. A bean mold measuring 6” x 6” x 20 is to be used for sampling
Distribution Test, Mechanical concrete, how many blows/tamps per layer shall be applied?
Analysis Answer: 60 blows/layer
23. What is the degree of compaction of the soil if the wet density is 2,200 47. If asphalt mix having a weight of 3,020g and an aggregate weighing
kg/m3, with an actual moisture content of 10.2% and a maximum dry 2,865.98g, what is the % asphalt by weight of mix?
density of 1,960 kg/m3? Answer: 5.10%
Answer: 101.86%
, 73. What is the required mixing of mortar for Item 505 (Stone Masonry)?
Answer: 1 part cement and 2 parts sand by volume with
50. Applying the tolerance of 0.4% for asphalt content to your answer in sufficient water
prob. 47, what is the acceptable range of asphalt content? 74. What is the required mixing of mortar for Item 500 (Pipe Culverts and
Answer: 4.7% to 5.5% Storm Drains)?
Answer: 1 part cement and 2 parts sand by volume with
51. An embankment having a PI of 30%, LL of 40% and GI of 0, what is sufficient water
the degree of compaction for this kind of soil?
Answer: 95% degree of compaction 75. Before the project starts, the materials Engineer or the technician must
have a program on how many samples for each item of work should
52. The minimum cement factor for concrete Class “A” is 9 bags/cu.m, how be tested based on the minimum testing requirements. What
about for concrete Class “B”? program or report is this?
Answer: 8 bags/cu.m Answer: Quality Control Program
53. Quality control testing in a DPWH project is the responsibility of 76. If sample splitter is not available for use in reducing samples for test,
the_____? what is the alternative way of reducing sample for testing size?
Answer: Contractor Answer: apply quartering method and get two opposite sides
as sample
54. As Materials Engineer, when is the right time to start sampling and
testing aggregates? 77. The road will not be opened to traffic until test specimens molded and
Answer: Once the source is identified cured have attained the minimum strength requirements. If such
tests are not conducted prior to the specified age the pavement shall
55. The minimum compressive strength for concrete Class “P” is 5,000 psi, not be operated to traffic until _____ days after the concrete was
what is the minimum compressive strength for concrete Class “C”? placed.
Answer: 3,000 psi Answer: Fourteen (14)
56. The volume of concrete mixer per batch shall not exceed the mixer’s 78. As the work progresses, the Materials Engineer should know how many
nominal capacity in cu.m as shown on the manufacturer’s standard sample has been submitted and tested and how many samples are to
plate on the mixer, except that an overload up to _____ percent be submitted, in other words the ME must refer to what report so
above the mixer’s nominal capacity may be permitted provided that he/she may be updated on the balance and on file quality test of
concrete test data for strength, segregation, and uniform consistency the construction materials being used in the project?
are satisfactory, and provided that no spillage of concrete takes Answer: Status of Test
place.
Answer: Ten (10) 79. It is the minimum moisture content at which the soil can be molded
without breaking or crumbling up to 1/8” (3.2 mm).
57. Where do we take additional cores when the measurement of any core Answer: Plastic Limit
taken from pavement is deficient in thickness by more than 25 mm?
Answer: at no less than 5 meter intervals parallel to the 80. The _____ is expressed as the moisture content corresponding to 25
centerline in each direction from the affected location blows.
Answer: Liquid Limit
58. Under what climatic condition do we use lower penetration grade or
hard asphalt? 81. The concrete has been tested for consistency by the use of a slump
Answer: hot climate (cold climate – higher penetration grade cone with base and tamping rod. After the test, the height of
or soft asphalt) concrete measured is 178 mm. what is the slump of the concrete?
Answer: 127 mm
59. What is the basis for the acceptance or rejection of any construction
material? 82. What is the rate of revolution per minute of an abrasion Machine used
Answer: Materials test results/reports for testing the mass percent of wear?
Answer: 30 – 33 rpm
60. Penetration test is for asphalt: cement is to _____?
Answer: consistency 83. If the design of concrete mix has the following corrected batch
weights: cement = 40 kgs, fine aggregates = 65 kgs, coarse
61. Slump test is a very important test in fresh concrete to determine aggregate = 115 kgs, and water = 15 liters. What is your actual
_____? batch weights for 1 cu.m Class “A” concrete?
Answer: consistency of concrete Answer: 360 bags of cement; 585 kgs of fine aggregates;
1035 kgs coarse aggregates; 130 liters water
62. How many samples should be taken for an asphalt mix for each full
day’s operation? 84. After the soil has been tested in an Abrasion Machine, the mass % of
Answer: at least one but not to exceed three samples wear computed is equal to 21%. If this material is for Item 201, does
it pass the DPWH specs?
Answer: Yes, because the specs is 50% maximum
63. The thickness of asphalt core using a caliper is based on how many
measurements? 85. Quality Control Assurance Report should be submitted every _____?
Answer: four (4) Answer: week
64. The thickness of concrete core using a caliper is based on how many 86. One of the duties of Materials Engineer is to see to it that all the
measurements? construction materials be tested:
Answer: nine (9) Answer: before it is incorporated into work
65. Failed samples do not necessarily mean that the structure it represents 87. What is the maximum depth or roadway embankment per horizontal
is defective, why? layer in loose measurement?
Answer: may be the sampling is incorrect Answer: 200 mm loose measurement
66. The specification calls for a 1: 2:4 concrete mix. In a one bagger mixer, 88. Why is it that 6 samples are needed for quality test of concrete
which of the following amount of water is most likely required for the masonry?
mix? Answer: 3 samples for compressive strength and 3 samples
Answer: 20 liters for absorption
67. The spot test on asphalt is used to determine ______. 89. Sample submitted for test should have a tag bearing the name of the
Answer: overheating during the process of manufacture project, the quantity represented, kind of sample, original source,
who sampled and who submitted it, the date sampled and date
68. How many samples shall be submitted for test if 315 pails of flat wall submitted and etc. What is the common name of that tag for you as
enamel paint are to be used in the project? Materials Engineer?
Answer: four (4) pails Answer: Sample Card
69. Aggregate Sub – base course has a volume of 5, 000 cu.m and to be 90. If course aggregate like embankment is to be placed in layers, how
laid in a 15cm compacted depth. How many samples shall be many layers should a 40 cm thick Aggregate Base Course is placed?
submitted for CBR test and for sieve analysis? Answer: Three (3)
Answer: 2 samples for CBR and 17 samples for sieve analysis
91. The ME should always be alert of his schedule with regards to the
70. How many samples shall be submitted for quality test if 60 tons of number of days of a quality test that takes place. Since not all
Bituminous Prime Coat is to be used in the project? construction materials can be tested just for a day or even a week
Answer: Two (2) samples so, what is the lead time should he consider for a quality test of a
cement sample?
71. How many compaction tests shall be conducted for Item 201 having a Answer: One (1) month
162.5 grams and an oven – dried weight of 138.2 grams?
1. What is the sample for compressive strength determination of a Answer: 17.58%
structural concrete?
Answer: concrete cylinder sample 26. If the group index of a soil is high, what indication does it mean?
Answer: the soil is clayey
2. What is the test to determine the consistency of concrete?
Answer: Slump test 27. As a Materials Engineer, how can you determine that the sample placed
in the oven is already oven – dried?
3. What is the length required for RSB sample for quality test? Answer: if the sample reaches its constant weight
Answer: 1.0 m/10,000kg/size/shipment
28. In oven drying a sample for test, what temperature shall be
4. How many samples should be taken for every 75 cu.m fresh maintained?
concrete? Answer: 110 ± 5°C
Answer: 1 set consist of 3-pcs sample
29. Why is it that cooling an oven dried sample before weighing is
5. What is the required size of test specimen for G.I. sheets? advisable?
Answer: 3 pcs-60mm x 60mm in 1 sht/100shts Answer: because it can affect its weight
6. What kind of paint that has a reflectance or beads?
Answer: Reflectorized paint 30. What is the difference between hygroscopic moisture content from
natural moisture content?
7. What is that construction material that has a property of being a dark Answer: HYGROSCOPIC MOISTURE CONTENT is the moisture
brown to black cementitious material in which the predominating content of an air – dried sample while NATURAL MOISTURE
substance is bitumen? CONTENT is the moisture content of the original sample from
Answer: asphalt the field.
8. For how long or how many hours shall a bituminous prime coat be 31. For how many bags of cement does a 10 kgs sample arepresents?
left undisturbed? Answer: 2000 bags
Answer: 24 hours
32. For 15, 000 kgs RSB, how many samples shall be submitted for Quality
9. What is the rate of application of bituminous tack coat? Test?
Answer: 0.2 to 0.7 L/sq. m Answer: 2 pcs – 1 m sample
10. What is the penetration grade of blown asphalt? 33. An admixture is being introduced to the fresh concrete mixture for
Answer: 0 to 30 penetration grade heavily reinforced concrete structure using a pump Crete to pump
out the fresh concrete mix, what admixture should it be?
11. What kind of sample is taken for flexural test? Answer: Super plasticizer
Answer: concrete beam sample
34. What is the use of blown asphalt?
12. What are the tests needed for the 2.650 cu.m Item 201 (Aggregate Answer: as joint filler and water proofing
Base Course)?
Answer: CBR, abrasion, GPCD 35. What asphalt is commonly known as hot asphalt or penetration grade
asphalt?
13. How many grading tests are required for a 3,200 cu.m selected borrow Answer: Asphalt Cement
topping (Item 104)?
Answer: 3 grading tests 36. How many days does the sample for Immersion – Compression Test be
soaked in water?
14. As a materials Engineer, what will you recommend if you find out that Answer: 4 days @ 50°C
the materials to be used as Item 200 if finer than the required
materials? 37. If ductility test is for asphalt, _____ is for cement?
Answer: blend Item 200 with coarser materials Answer: Magnesium Oxide, Insoluble Residue, Loss on
Ignition
15. What is the standard specification for LL
and PI of Item 201? 38. Paint is composed of _____
Answer: maximum of 25% and Answer: 35% vehicle, 50% pigment, 15% beads
maximum of 6% respectively
16. What is the CBR requirement for Item 39. What is the size of tamping rod used in tamping concrete sample?
201? Answer: 16 mm Ø and 610 mm long with hemispherical tip
Answer: 80% maximum
40. What is the temperature to be maintained when curing sample after its
17. What asphalt is used for sealing weaken initial curing?
plane joint of concrete pavement? Answer: 23°C ± 1.7°C
Answer: Blown Asphalt
41. Concrete cylinders are cured and ready for test. Temperature between
18. What is Item 311 of the DPWH 63°F to 85°F are permitted for a period not to exceed _____ hours
Specification (Blue Book)? immediately prior to test if free moisture is maintained on the surface
Answer: Portland Cement Concrete of the specimen at all times.
Pavement Answer: three (3)
19. What is the machine used for abrasion 42. The molds of specimen not to be transported shall be removed after
test? initial curing of _____ hours and should be cured to the standard
Answer: Los Angeles Abrasion curing temperature of 73.4 °F ± 3°F
Machine Answer: Twenty – four (24)
20. How to determine the degree of 43. High plasticity index means _____ of a soil?
compaction of Items 104, 200, & 201? Answer: high degree of compressibility
Answer: by Field Density Test
44. Sample to be used for liquid limit and plastic limit tests should pass to
21. What is the formula in obtaining the what sieve?
value of PI? Answer: No. 40 (0.425 mm)
Answer: Liquid Limit minus Plastic
Limit 45. What compaction rammer shall used if the specs given for Moisture –
Density Relation Test (MDR) is T – 180?
22. What are the other terms for sieve Answer: 4.54 kg with 457 mm drop
analysis?
Answer: Grading Test, Particle Size 46. A bean mold measuring 6” x 6” x 20 is to be used for sampling
Distribution Test, Mechanical concrete, how many blows/tamps per layer shall be applied?
Analysis Answer: 60 blows/layer
23. What is the degree of compaction of the soil if the wet density is 2,200 47. If asphalt mix having a weight of 3,020g and an aggregate weighing
kg/m3, with an actual moisture content of 10.2% and a maximum dry 2,865.98g, what is the % asphalt by weight of mix?
density of 1,960 kg/m3? Answer: 5.10%
Answer: 101.86%
, 73. What is the required mixing of mortar for Item 505 (Stone Masonry)?
Answer: 1 part cement and 2 parts sand by volume with
50. Applying the tolerance of 0.4% for asphalt content to your answer in sufficient water
prob. 47, what is the acceptable range of asphalt content? 74. What is the required mixing of mortar for Item 500 (Pipe Culverts and
Answer: 4.7% to 5.5% Storm Drains)?
Answer: 1 part cement and 2 parts sand by volume with
51. An embankment having a PI of 30%, LL of 40% and GI of 0, what is sufficient water
the degree of compaction for this kind of soil?
Answer: 95% degree of compaction 75. Before the project starts, the materials Engineer or the technician must
have a program on how many samples for each item of work should
52. The minimum cement factor for concrete Class “A” is 9 bags/cu.m, how be tested based on the minimum testing requirements. What
about for concrete Class “B”? program or report is this?
Answer: 8 bags/cu.m Answer: Quality Control Program
53. Quality control testing in a DPWH project is the responsibility of 76. If sample splitter is not available for use in reducing samples for test,
the_____? what is the alternative way of reducing sample for testing size?
Answer: Contractor Answer: apply quartering method and get two opposite sides
as sample
54. As Materials Engineer, when is the right time to start sampling and
testing aggregates? 77. The road will not be opened to traffic until test specimens molded and
Answer: Once the source is identified cured have attained the minimum strength requirements. If such
tests are not conducted prior to the specified age the pavement shall
55. The minimum compressive strength for concrete Class “P” is 5,000 psi, not be operated to traffic until _____ days after the concrete was
what is the minimum compressive strength for concrete Class “C”? placed.
Answer: 3,000 psi Answer: Fourteen (14)
56. The volume of concrete mixer per batch shall not exceed the mixer’s 78. As the work progresses, the Materials Engineer should know how many
nominal capacity in cu.m as shown on the manufacturer’s standard sample has been submitted and tested and how many samples are to
plate on the mixer, except that an overload up to _____ percent be submitted, in other words the ME must refer to what report so
above the mixer’s nominal capacity may be permitted provided that he/she may be updated on the balance and on file quality test of
concrete test data for strength, segregation, and uniform consistency the construction materials being used in the project?
are satisfactory, and provided that no spillage of concrete takes Answer: Status of Test
place.
Answer: Ten (10) 79. It is the minimum moisture content at which the soil can be molded
without breaking or crumbling up to 1/8” (3.2 mm).
57. Where do we take additional cores when the measurement of any core Answer: Plastic Limit
taken from pavement is deficient in thickness by more than 25 mm?
Answer: at no less than 5 meter intervals parallel to the 80. The _____ is expressed as the moisture content corresponding to 25
centerline in each direction from the affected location blows.
Answer: Liquid Limit
58. Under what climatic condition do we use lower penetration grade or
hard asphalt? 81. The concrete has been tested for consistency by the use of a slump
Answer: hot climate (cold climate – higher penetration grade cone with base and tamping rod. After the test, the height of
or soft asphalt) concrete measured is 178 mm. what is the slump of the concrete?
Answer: 127 mm
59. What is the basis for the acceptance or rejection of any construction
material? 82. What is the rate of revolution per minute of an abrasion Machine used
Answer: Materials test results/reports for testing the mass percent of wear?
Answer: 30 – 33 rpm
60. Penetration test is for asphalt: cement is to _____?
Answer: consistency 83. If the design of concrete mix has the following corrected batch
weights: cement = 40 kgs, fine aggregates = 65 kgs, coarse
61. Slump test is a very important test in fresh concrete to determine aggregate = 115 kgs, and water = 15 liters. What is your actual
_____? batch weights for 1 cu.m Class “A” concrete?
Answer: consistency of concrete Answer: 360 bags of cement; 585 kgs of fine aggregates;
1035 kgs coarse aggregates; 130 liters water
62. How many samples should be taken for an asphalt mix for each full
day’s operation? 84. After the soil has been tested in an Abrasion Machine, the mass % of
Answer: at least one but not to exceed three samples wear computed is equal to 21%. If this material is for Item 201, does
it pass the DPWH specs?
Answer: Yes, because the specs is 50% maximum
63. The thickness of asphalt core using a caliper is based on how many
measurements? 85. Quality Control Assurance Report should be submitted every _____?
Answer: four (4) Answer: week
64. The thickness of concrete core using a caliper is based on how many 86. One of the duties of Materials Engineer is to see to it that all the
measurements? construction materials be tested:
Answer: nine (9) Answer: before it is incorporated into work
65. Failed samples do not necessarily mean that the structure it represents 87. What is the maximum depth or roadway embankment per horizontal
is defective, why? layer in loose measurement?
Answer: may be the sampling is incorrect Answer: 200 mm loose measurement
66. The specification calls for a 1: 2:4 concrete mix. In a one bagger mixer, 88. Why is it that 6 samples are needed for quality test of concrete
which of the following amount of water is most likely required for the masonry?
mix? Answer: 3 samples for compressive strength and 3 samples
Answer: 20 liters for absorption
67. The spot test on asphalt is used to determine ______. 89. Sample submitted for test should have a tag bearing the name of the
Answer: overheating during the process of manufacture project, the quantity represented, kind of sample, original source,
who sampled and who submitted it, the date sampled and date
68. How many samples shall be submitted for test if 315 pails of flat wall submitted and etc. What is the common name of that tag for you as
enamel paint are to be used in the project? Materials Engineer?
Answer: four (4) pails Answer: Sample Card
69. Aggregate Sub – base course has a volume of 5, 000 cu.m and to be 90. If course aggregate like embankment is to be placed in layers, how
laid in a 15cm compacted depth. How many samples shall be many layers should a 40 cm thick Aggregate Base Course is placed?
submitted for CBR test and for sieve analysis? Answer: Three (3)
Answer: 2 samples for CBR and 17 samples for sieve analysis
91. The ME should always be alert of his schedule with regards to the
70. How many samples shall be submitted for quality test if 60 tons of number of days of a quality test that takes place. Since not all
Bituminous Prime Coat is to be used in the project? construction materials can be tested just for a day or even a week
Answer: Two (2) samples so, what is the lead time should he consider for a quality test of a
cement sample?
71. How many compaction tests shall be conducted for Item 201 having a Answer: One (1) month
