Questions- Materials Testing

7/31/2019 Questions- Materials Testing

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1. From the materials point of view, subgrade construction consists mainly of:

a. compaction of the top layer in cuts

b. compaction of the whole depth of material in embankment

c. identification and treatment of unusable material

d. all of the above

2. The improper compaction of an embankment material will:

a. minimize compressibility

b. decrease soil permeability

c. increase shear strength and soil stability

d. none of the above

3. Which of the following in considered suitable as embankment material?a. highly organic materials

b. soils with a natural water content exceeding 100%

c. soils that cannot be properly compacted



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4. Aggregates for concrete mixes are classified as either fine or coarse aggregates.Which sieve is used to separate fine from coarse aggregates?

a. No.4 (4.75 mm)

b. No. 6 (3.35 mm)

c. No. 8 (2.36 mm)

d. None of the above

5. What is the basis for acceptance or rejection of any construction material?

a. Minimum Testing Requirement

b. Certification Materials Availability

c. Certificate of Acceptance

d. Materials Test Report

6. Concrete should be kept continuously wet by the application of water for aminimum period of how many days after it has been placed?

a. 3

b. 7

c. 14

d. 28


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7. The moisture content of a soil is generally based on its:

a. oven-dry weight

b. air-dry weight

c. sun-dry weightd. all of the above

8. In slip-form construction, what is the slump of the concrete used?

a. Not more than 3

b. 3 to 4c. almost zero

d. any of the above

9. What documentation should be maintained and kept updated by the materialsengineer during project implementation?

a. minimum testing requirements

b. materials logbook

c. quality control handbook

d. materials test result


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10. What chemical admixture is needed to produce a concrete mix with improvedslump without additional water?

a. set accelerating admixture

b. set retarding admixture

c. water reducing admixture

d. fly ash

11. What will possibly be the result of using different brands of cement in concretepaving?

a. Different strength

b. Different texture

c. Different color after it has hardened

d. No effect

12. In soils testing, SPT means

a. Soil Penetration Test

b. Standard Penetration Test

c. Sampling and Preparation Technique

d. Standard Preparation Test


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13. As construction work progresses, you noticed that the materials delivered at theproject site are different from the ones tested and that passes the requirements. Asmaterials engineer, what would you do?

a. authorize the use of the materials

b. conduct immediate retesting of the materials for verification purposes

c. reject the materials

d. replace the materials

14. When the result of the second test differs from that of the first test on a samplerepresenting the same lot of materials, a third test is done. This is referred to as:

a. tertiary test

b. verdict test

c. referee test

d. final test


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15. Specimens for compressive of flexural strength test shall be removed form themolds at the end of 24 hours and stored in a moist condition at a temperature rangeof ____ until the time of test.

a. 22o

C to 22o

C

b. 22o C to 26oC

c. 18o C to 26oC

d. 18o C to 24oC

16. What should be done on the subbase course with existing moisture content of10% higher that the optimum moisture of the ASSHTO T180 Method D?

a. Spread to the required loose thickness and compact

b. Add water, spread to the required loose thickness and compact

c. Dry our to reduce moisture, spread of the required loose thickness andcompact

d. Spread to the required loose thickness


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17. Concrete curing refers to:

a. procedures done to repair damages in concrete surface

b. procedures done to promote cement hydration

c. procedures done to maximize concrete strengthd. procedures done to minimize concrete cracking

18. The required strength of a concrete beam sample is at least _____ when testedby the third point:

a. 550 psi

b. 650 psi

c. 3,000 psi

d. 3,500 psi

19. Emulsified asphalt applied as tack coat prior to laying of bituminous mix iscompletely cured once it turns to what color?

a. brown

b. gray

c. black



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20. In testing, approximately, how many kilograms of steel bars of each size shouldbe a one (1) meter long specimen be represented?

a. 15,000 kgs

b. 12,000 kgs

c. 10,000 kgs

d. 5,000 kgs

21. The treatment of fresh concrete with the purpose of retaining sufficient waterwithin the mass to permit hydration of the cement is called:

a. hydration

b. curing

c. hardening

d. agitation

22. As Materials Engineer during construction, the CBR value of subgrade materialsused in the design is important to:

a. know the quality of subgrade materials required in the project

b. check whether the proposed borrow source complies with the specifications

c. all of the above


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23. The moisture-density curve is different for each soil. Which of the followingstatements is/are true?

a. Granular, well-graded soils generally have fairly high maximum densities atlow optimum moisture content (OMC)

b. Clay soils have lower densities at OMC than granular, well-graded soils

c. Granular, well-graded soils have higher densities than uniform soils at OMC

d. All of the above

24. The best way to determine the temperature of the delivered asphalt mix is with adial and armored stem thermometer. The stem should be inserted sufficiently intothe mixture to a depth of at least :

a. 2 inches

b. 4 inchesc. 6 inches

d. 8 inches


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25. Before an asphalt pavement or asphalt surface treatment is placed on a newlyprepared granular base, what is applied?

a. Seal Coat

b. Tack Coat

c. Prime Coat

d. Bituminous Surface Treatment

26. The asphalt pavement represented by the cores shall not be accepted is thedeficiency in density is more than:

a. 1%

b. 2%

c. 3%

d. 4%

27. Testing of concrete samples may be done at an earlier age for purposes of:

a. payment of completed pavement

b. determining the trend of its strength development

c. designing the concrete mixture

d. all of the above


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28. Geosynthesis may be used for:

a. filtration and drainage

b. reinforcement

c. erosion controld. all of the above

29. Materials suitable for selected borrow shall have a plasticity index of not morethan:

a. 12

b. 10

c. 8

d. 6

30. Under what climatic condition(s) do we use the lower penetration grade or hardasphalts?

a. cold climate

b. hot climate

c. both cold and hot climate

d. rainy weather


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33. If the soil is properly compacted or compacted at maximum density, it will:

a. increase stability/strength

b. minimize future settlement

c. decrease permeabilityd. all of the above

34. As percent asphalt increases in Marshall stability tests, the % air voids:

a. increases

b. decreasesc. remains constant

d. either a or b

35. Per program of work, the estimated volume of item 201 materials is 17,500cu.m. How many CBR test is required based on the DPWH minimum testingrequirements?

a. 5

b. 7

c. 10

d. 12


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36. A field density result of 88% degree of compaction obtained on the subgradeindicates that:

a. compaction of the subgrade meets the compaction specification

b. compaction of the subgrade fails the compaction specification but can be

accepted

c. compaction of the subgrade fails the compaction specification and needs

additional compaction


37.What is the best temperature to begin rolling (compaction) of the bituminousmix?

a. maximum temperature at which the mix will support the roller without moving

horizontally

b. maximum temperature at which the mix can be compacted without watering

the roller

c. the minimum temperature at which densification can take place

d. the minimum temperature at which the mix can be compacted without

cracking


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38. Given: Liquid limit = 45%

Plastic Limit = 35%

Calculate the plasticity index.

a. 10%

b. 17.5%

c. 22.5%

d. 80%

39. In specifying an asphalt material, what does term 60-70 refer to?a. Viscosity

b. Ductility

c. Solubility

d. Penetration grade


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40. The aggregate component contributes internal friction to shear strength andstability of the bituminous mixture. The desirable shape and surface texture ofaggregate particles are:

a. round and smooth aggregate particles

b. angular and smooth aggregate particles

c. round and rough-textured particles

d. angular and rough-textured particles

41. A one-lane road, with pavement width of 3.5 meters and shopulder width of 0.5

meter on each side of the pavement, was designed to have subbase and basecourses with a combined thickness of 300mm. If the thickness of the subbase is125mm, the spreading and compaction of the subbase and base courses shall becarried out in:

a. 3 layers over the full width of 4.5 m

b. 2 layers over the full width of 4.5 mc. 3 layers over the full width of 3.5 m

d. 2 layers over the full width of 3.5 m


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42. How many cores shall be taken for thickness determination on a one kilometerPCCP?

a. 5 cores per lane

b. 10 cores per lane

c. 2 cores per lane

d. 6 cores per lane

43. What is used to measure pavement surface irregularity?a. Falling weight deflectometer equipment

b. Benkelmen beam apparatus

c. Dynamic cone penetrometer apparatus

d. 3-meter straight edge


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40. The aggregate component contributes internal friction to shear strength andstability of the bituminous mixture. The desirable shape and surface texture ofaggregate particles are:

a. round and smooth aggregate particles

b. angular and smooth aggregate particles

c. round and rough-textured particles

d. angular and rough-textured particles

41. A one-lane road, with pavement width of 3.5 meters and shopulder width of 0.5

meter on each side of the pavement, was designed to have subbase and basecourses with a combined thickness of 300mm. If the thickness of the subbase is125mm, the spreading and compaction of the subbase and base courses shall becarried out in:

a. 3 layers over the full width of 4.5 m

b. 2 layers over the full width of 4.5 mc. 3 layers over the full width of 3.5 m

d. 2 layers over the full width of 3.5 m

46 Th f ll i lt bt i d f t t d t l


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46. The following results were obtained form tests down on aggregate samples:

Liquid limits of fined = 25%

Plasticity index = 5%

Mass percent of wear of coarse aggregates = 55%

CBR value = 25

From the results, it could be concluded that the samples meet the specifications for:

a. Item 200

b. Item 201

c. Item 202

d. Item 202

47. The purpose of capping concrete cylinders with sulfur compound prior to testingfor compression is to:

a. protect the ends of the cylinder from premature breaking resulting from

improper application of load

b. provide smooth, flat ends that are perpendicular to the axis of the sample

c. prevent cylinder from tilting

d. to maintain the verticality of the cylinder


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48. A permit issued by the Project Engineer to ascertain that all preparatory worksprior to concreting have been verified to be in accordance with the plans andspecifications by the Materials Engineer and Project Inspector is:

a. building permit

b. concrete pouring permit

c. excavation permit

d. occupancy permit

49. Excessive vibration of newly-placed fresh concrete may result in:

a. smooth surface finish

b. well dense graded mix

c. bleeding/laitance

d. quick settlement


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50. Stability of an asphalt pavement is its ability to resist shoving and rutting undertraffic loads. In general, higher stability of the mix can be attained by using:

a. more medium size and sand

b. angular and rough aggregates

c. more asphalt

d. b and c

51. Asphaltic concrete binder course paving is in progress. The Project Inspector orthe Foreman tells you that the mix from the computer-controlled plant appears that

aggregates are not fully coated with bitumen. What would you do as MaterialsEngineer?

a. Increase the programmed bitumen weight

b. Decrease the programmed aggregate weight

c. Decrease the programmed aggregate weight

d. Check for defects in the plant


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52. What is the function of emulsifier water in liquid asphalt?

a. to increase mixing ability with aggregates

b. to retain water in asphalt for longer periods

c. to prevent asphalt from hardening

d. to enable asphalt and water to mix

53. Using truck mixers, the time elapsed (in minutes) from the time water is added

to the mix per batch until the concrete mix is deposited in place at the site shall notexceed:

a. 30

b. 60

c. 90d. 120


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54. Which of the following is authorized to test materials for use in DPWH projects?

a. any of the DPWH-accredited private testing laboratory

b. any testing laboratory of a local government unit with prior clearance fromDPWH implementing office

c. any DPWH-accredited private testing laboratory, with prior clearance from

DPWH implementing office

d. all of the above

55. The moisture density relation test determines the:

a. natural water content

b. maximum dry density

c. degree of compaction

d. organic content

56 Wh diff i h i i f I 201 A A B C f


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56. What differentiates the composition of Item 201-A Aggregates Base Course fromItem 200-Aggregates subbase Course?

a. Item 201 contains less binder and smaller size of gravel than Item 200

b. Item 201 contains more binder and bigger size of gravel than Item 200

c. Item 201 contains sand and gravel only

d. Item 201 contains sand and fine-grained soils only

57. A set of three (3) beam samples representing a particular section of theconcrete pavement failed to meet the flexural strength requirement. As materials

engineer, what would you recommend?a. monitor the pavement section with strength deficiency

b. adjust payment corresponding to the strength deficiency of the beam samples

c. conduct core tests for strength determination on section represented by the

failed samples to determine the actual strength of the in-placed concreted. submit new beam samples for testing

58 Wh d h / li b i h P j /M i l E i h


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58. When does the contractor/supplier submit to the Project/Materials Engineer thejob-mix formula bituminous mixes for his approval?

a. At least one week prior to the production of the mix

b. At least three weeks prior to the production of the mix

c. Upon delivery of the mix

d. Upon the request of the Project/Materials Engineer

59. Concrete in the area represented by the cores will be considered adequate iftheir average strength is equal to:

a. at least 85% of and no single core is less than 85% of fc

b. at least 75% of and no single core is less than 75% of fc

c. at least 85% of and no single core is less than 775% of fc

d. at least 75% of and no single core is less than 85% of fc

60. What does grade of steel bars mean?

a. yield point

b. relative density

c. strain limit

d. degree of hardness

61 F ll i th lt bt i d f fi ld d it d l b t ti


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61. Following are the results obtained from field density and laboratory compactiontests: Weight of dry soil 80 grams

Weight of water in the soil sample 16 grams

Wet density of soil 1.92 grams per cc.

Maximum dry density obtained from laboratory compaction 1.68 gms/cc

Using the above data, the moisture content of the soil is:

a. 15%

b. 20%

c. 25%

d. 30%

62. The proper and accurate measurement of all the materials used in theproduction of concrete to ensure uniformity of proportions and aggregate grading is

called:a. quality control

b. batching

c. pumping

d. mix design

63 Th t i t t i l f t ff ti th t th f t i


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63. The most important single factor affecting the strength of concrete is:

a. the quality of aggregates and cement

b. water-cement ratio

c. curing conditions

d. duration of mixing

64. What is the minimum test requirement for riprap boulders?

a. Stone size and specific gravity

b. Stone size or weight test and inspection report on assessment of stonesoundness

c. Stone size or weight test and abrasion test


65. Bituminous concrete mixes contain asphalt by weight equivalent to:a. 10-15%

b. 8-12%

c. 6-10%

d. 5-8%


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66. If there is a necessity for increasing the water content of concrete intended forstructures for for better workability, which of the following should be undrtaken?

a. mixture should be redesigned

b. water and cement should be added

c. water, cement and sand should be added

d. water should be added

67. What other type of cement is allowed to be used for items 311 and 405 in theabsence of Portland Cement?

a. Portland cement type I

b. Pozzoland cement

c. Portland Pozzoland cement type IPd. Hydraulic cement

68 Testing of steel bars may be waived for small projects located in remote areas


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68. Testing of steel bars may be waived for small projects located in remote areaswhere the quantity of steel bars to be used is too small. Which of the following canbe used as basis for acceptance of the material?

a. Certificate of Materials Availability

b. Inspection Report

c. Certificate of Quality Control Assurance

d. Mill Certificate

69. In pavement construction, what is the required density of the bituminous

mixtures based on laboratory density of the compacted specimens?a. Equal or greater than 65%

b. Equal or greater than 75%

c. Equal or greater than 85%

d. Equal or greater than 95%70.In bituminous plant-mix surface course, the temperature of the mix shall have anallowable tolerance of:

a. +5 degrees celsius c. +15 degrees celsius

b. +10 degrees celsius d. +20 degrees celsius


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71. Which of the following is not a duty of the asphalt plant inspector?

a. knowing the procedure for properly calibrating asphalt meters and aggregate

feeders

b. monitoring plant operations to ensure uniform production of mix meeting

specifications

c. adjusting any plant control, setting any dial, gauges or meters

d. maintaining complete and accurate formal records

72. Sampling of soil aggregates in a big stockpile shall be done by:

a. taking sample from the bottom, middle and top of the stockpile

b. shovelling-off the surface at the bottom of the stockpile and taking full sample

thereat

c. shovelling-off the surface at the middle of the stockpile and taking full sample

thereat


73 Quality control testing in a DPWH projects is the responsibility of the:


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73. Quality control testing in a DPWH projects is the responsibility of the:.

a. DPWH

b. Contractor

c. DPWH and contractor

d. Construction supervision consultant

74. What is the specification range for asphalt content in a bituminous concrete mixfor surface course paving?

a. 4 to 10% of the total dry aggregates mass weight

b. 5 to 8% of the total dry aggregates mass weight

c. 3.5 to 7.5% of the total dry aggregates mass weight

d. 4 to 8% of the total dry aggregates mass weight

75. Angular coarse aggregates when used in concrete mix will require more:

a. water

b. fine aggregates

c. cement

d. both a and b

76 In concrete pavement construction a concrete mix was not placed within 1 hour


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76. In concrete pavement construction, a concrete mix was not placed within 1 hourand 50 minutes. What should the Materials engineer recommend?

a. add water and pour the mix

b. allow the mix to be poured after a certain test

c. reject the mix

d. allow the mix to be poured after adding cement and proper mixing

77. The index of retained strength of the compacted bituminous mixtures is theration of the compressive strength of immersed and dry bituminous mixtures. What

is the minimum index of retained strength required for bituminous mixtures?a. 40%

b. 50%

c. 60%

d. 70%78. The DPWH Specifications provide _____ tolerance for asphalt pavementthickness.

a. a +5mm c. a +10%

b. a +5% d. -5mm


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79. Given: Weight of dry aggregates = 950 grams

Weight asphalt = 50 grams

What is the percent of asphalt by weight of total mix?

a. 5%

b. 5.26%

c. 5.55%

d. 6%

80. The temperature of concrete during the period of mixing while in transportand/or during placing shall not be permitted to rise above:

a. 25 degrees Celsius

b. 40 degrees Celsius

c. 36 degrees Celsius

d. 50 degrees Celsius


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81. The temperature of a 5.0 cu.m. bituminous mix delivered at the project site is 15degrees centigrade lower then the required compaction temperature require by theJob-Mix Formula. As materials engineer of the project, what should you

recommend?a. allow the use of the delivered materials

b. advise the contractor to spread the mixture in one layer only

c. reject the delivered material

d. adjust the Job-Mix Formula

82. The minimum CBR value for base course should be ______ percent.

a. 60%

b. 70%

c. 80%

d. 90%


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83. When taking three or more samples of aggregates to be combined for onematerials sample

a. the small samples must be packed in separate sample bags

b. the small samples must be obtained from different lotsc. the small samples should be of approximately equal size


84. Where do we take additional cores when the measurement of any core takenfrom the pavement is deficient in thickness by more than 25mm?

a. at no less than 20 meter intervals parallel to the centerline in each direction

from the affected location

b. at no less than 15 meter intervals parallel to the centerline in each direction


c. at no less than 10 meter intervals parallel to the centerline in each direction


d. at no less than 5 meter intervals parallel to the centerline in each direction



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85. The minimum moisture content at which soil can be rolled into a thread of 1/8 in

a diameter without breaking is known as __________.

a. liquid limit

b. plastic limitc. shrinkage limit

d. Atterberg limit

86. If permitted by the engineer, additional water may be added to the batchconcrete materials in truck mixers for Portland Cement Concrete Pavement.Additional mixing may be performed to increase the slump to meet the specifiedrequirements provided that the water-cement ratio is not exceeded and that the saidoperations are performed within ______ minutes after the initial mixing operation.

a. 90

b. 60

c. 45

d. 30

87 When the strength test results of concrete beam or cylinder samples are not


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87. When the strength test results of concrete beam or cylinder samples are notacceptable, how many representative core/s shall be taken from each member orarea of concrete in-place considered deficient?

a. at least 4 cores

b. at least 3 cores

c. at least 2 cores

d. only 1 core

88. The frequency of sampling and testing for compacting of subbase material is:

a. 1 per 1500 cu.m.

b. 1 per 2500 cu.m.

c. 1 per 500 cu.m.

d. 1 per 750 cu.m.

89. Which of the following is not a responsibility of the materials engineer?

a. Sampling of materials

b. Analysis of test results of materials

c. Scheduling of delivery of materials

d. Design of concrete and asphalt mixes


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90. What penetration grade of asphaltic material is appropriate for stealing of PCCPjoints?

a. 85-100

b. 120-150c. 150-200

d. not exceeding 90

91. When the plasticity index of a soil is zero, it means that:

a. the soil is non-plasticb. the plastic limit is equal to the liquid limit

c. the plastic limit is greater than the liquid limit

d. the soil is too plastic

92. The purpose of compacting a concrete mix is to:

a. eject entrapped air

b. produce a dense concrete

c. prevent honeycombing

d. all of the above


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93. A steel bar is considered undersized if:

a. its nominal diameter as determined by caliper measurement was not attained

b. it fails to meet the variation in mass

c. its fails to meet the elongation requirement

d. it fails to meet the tensile requirement

94. If the density of a newly rolled asphalt pavement is 95%, what is the percentasphalt content by

a. 4.75%b. 5.0%

c. 5.26%

d. 6.0%

95. Which of the following is true regarding the rebound (Schmidt) hammer test forconcrete?


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95. Which of the following is true regarding the rebound (Schmidt) hammer test forconcrete?

a. The test is used to determine the uniformity of concrete

b. Can be used as a substitute to direct methods of compressive strengthdetermination such as tests on cored samples

c. Is a simple and versatile test method which can be used on rough concrete

surfaces

d. all of the above96. What is the most commonly accepted measure of the hardness of aggregates?

a. Soundness Test

b. Los Angeles Abrasion test

c. Petrographic test

d. Fractured face test


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97. What do you call the bituminous mixture composed of aggregates and liquidasphalt which can be used effectively during wet season?

a. Hot mix

b. Cold mixc. Slurry mix

d. Bituminous madacam mix


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