Materials 2

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  • 1/100 Questions

    In sampling asphalt the following should be observed

    • Use new clean containers to avoid contamination
    • Seal filled containers with clean, dry tight fitting lids
    • Labels containers clearly and properly
    • All of the above
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About This Quiz

This quiz, titled 'materials 2', assesses knowledge on bituminous materials used in civil engineering. It covers tests for asphalt content, penetration, compaction temperature, deformation resistance, and grading of asphalt cement, crucial for professionals in the field.

Materials Quizzes & Trivia

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  • 2. 

    Dowel bars for concrete pavement

    • Plain round bars

    • Deformed bars

    • Square bars

    • Octagonal bars

    Correct Answer
    A. Plain round bars
    Explanation
    Plain round bars are commonly used as dowel bars for concrete pavement. Dowel bars are used to transfer the load and prevent the formation of cracks in concrete pavements. Plain round bars are preferred due to their simplicity and ease of installation. They have a smooth surface, which allows for easy movement and rotation within the concrete. This helps to accommodate any expansion or contraction of the pavement without causing cracks. Deformed bars, square bars, and octagonal bars are not typically used as dowel bars for concrete pavement.

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  • 3. 

    In identifying project location intended for asphalt pavement, which of the following criteria is not appropriate to recommend?

    • Drainage facilities is well maintained

    • Location is not a typhoon belt area

    • Existing base course is stable

    • Flood-prone section

    Correct Answer
    A. Flood-prone section
    Explanation
    The criteria of flood-prone section is not appropriate to recommend when identifying a project location for asphalt pavement. This is because a flood-prone area is not suitable for constructing asphalt pavement as it can lead to damage and deterioration of the pavement due to water infiltration and erosion. Therefore, it is important to avoid flood-prone sections when selecting a project location for asphalt pavement.

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  • 4. 

    If no core was taken at the end of each days operations and the project has already been completed

    • A core shall be taken for every 100 linear meters

    • Three cores shall be taken for every 150 linear meters

    • 3 core for every 100 linear meters

    • 2 core for every 100 linear meters

    Correct Answer
    A. A core shall be taken for every 100 linear meters
    Explanation
    The correct answer is "a core shall be taken for every 100 linear meters". This means that for every 100 linear meters of the project, a core sample should be taken. This is a standard practice in construction projects to ensure the quality and integrity of the materials used. By taking core samples, engineers can assess the properties of the materials and make any necessary adjustments or repairs if needed.

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  • 5. 

    A job-mix formula provides for close control of

    • Asphalt content

    • Aggregate gradation

    • Temperature of asphalt, aggregate and mix

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    A job-mix formula is a set of specifications and proportions that determine the asphalt content, aggregate gradation, and temperature of asphalt, aggregate, and mix in a construction project. By including all of these factors in the formula, it allows for close control over the quality and performance of the asphalt mix. This ensures that the mix meets the required specifications and provides the desired durability and performance for the specific project.

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  • 6. 

    Blue smoke rising from the mix in the truck or in the spreader hopper may indicate

    • Excess asphalt

    • Overheated batch

    • Excess moisture content

    • Excess moisture content and asphalt cement

    Correct Answer
    A. Overheated batch
    Explanation
    Blue smoke rising from the mix in the truck or spreader hopper may indicate an overheated batch. When asphalt mix is overheated, it can release volatile compounds that produce blue smoke. This can occur if the mix is heated at a temperature higher than recommended, causing the asphalt to break down and release fumes. Overheating can negatively impact the quality and performance of the asphalt mix, leading to potential issues with the pavement surface. Therefore, it is important to monitor and control the temperature during the asphalt production process to prevent overheating.

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  • 7. 

    Required # of cores on compacted asphalt concrete mix taken for each full days operations.

    • At least one, but not more than 3 core

    • At least two, but not more than 6 core

    • At least two, but not more than 3 core

    • At least one, but not more than 6 core

    Correct Answer
    A. At least one, but not more than 3 core
    Explanation
    The correct answer is "at least one, but not more than 3 core" because it specifies the minimum and maximum number of cores required for each full day's operations. This means that a minimum of one core must be taken, but no more than three cores can be taken. This allows for sufficient sampling to ensure the quality and consistency of the compacted asphalt concrete mix, without excessive testing that may be unnecessary or time-consuming.

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  • 8. 

    The apparatus used in determining the grade of asphalt cement is

    • Hydrometer

    • Penetromanometer

    • Petronmeter

    • Penetrometer

    Correct Answer
    A. Penetrometer
    Explanation
    A penetrometer is the apparatus used in determining the grade of asphalt cement. A penetrometer is a device that measures the penetration resistance of a material, in this case, asphalt cement. By measuring the depth to which a penetrometer needle can penetrate the asphalt, the grade or consistency of the asphalt can be determined. This information is important in determining the suitability of the asphalt for various construction applications.

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  • 9. 

    The service performance of an asphalt pavement is greatly influence by

    • Grade of asphalt

    • Quantity of asphalt

    • A and b

    • None of the above

    Correct Answer
    A. A and b
    Explanation
    The service performance of an asphalt pavement is greatly influenced by the grade and quantity of asphalt. The grade of asphalt refers to its quality and characteristics, such as viscosity and resistance to temperature changes. The quantity of asphalt used in the pavement construction also plays a crucial role in determining its performance. Both factors, grade, and quantity of asphalt, have a direct impact on the durability, strength, and ability of the pavement to withstand traffic loads and environmental conditions. Therefore, a and b are correct answers as both factors are important in determining the service performance of an asphalt pavement.

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  • 10. 

    Concrete in the area represented by the cores will be considered if the average strength of the cores is equal to:

    • At least 75% of and no single core is less than 85% the specified strength fc'

    • At least 85% of and no single core is less than 75% the specified strength fc'

    • At least equal or exceed specified strength fc' and no single strength test less than 20% of the specified strength fc'

    • At least equal or exceed specified strength fc' and no single strength test less than 10% of the specified strength fc'

    Correct Answer
    A. At least 85% of and no single core is less than 75% the specified strength fc'
    Explanation
    The correct answer states that the concrete in the area represented by the cores will be considered if the average strength of the cores is at least 85% of the specified strength fc' and no single core is less than 75% of fc'. This means that the overall strength of the concrete should be relatively high, with the average strength being close to or exceeding 85% of the specified strength. Additionally, no individual core should have a strength less than 75% of fc', ensuring that there are no weak spots or inconsistencies in the concrete's strength.

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  • 11. 

    Which of the following bituminous material is best recommended for sealing weakened place and construction joints of the PCCP.

    • Asphalt cement

    • Emulsified asphalt

    • Cutback asphalt

    • Joint filler asphalt

    Correct Answer
    A. Joint filler asphalt
    Explanation
    Joint filler asphalt is the best recommended bituminous material for sealing weakened places and construction joints of the PCCP (Portland Cement Concrete Pavement). Joint filler asphalt is specifically designed for filling and sealing joints in concrete pavements. It provides excellent adhesion, flexibility, and durability, ensuring long-lasting protection against water infiltration, cracking, and joint deterioration. Additionally, joint filler asphalt has the ability to accommodate movement and thermal expansion/contraction of the concrete, making it an ideal choice for sealing joints in PCCP.

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  • 12. 

    In asphalt pavement construction, after spreading bituminous mix, compaction will follow where rolling shall begin at the sides and proceed longitudinally parallel toward the road centerline, each trip overlapping __ of the roller width, gradually progressing to the crown of the road

    • 1/2

    • 1

    • 1 1/2

    • 2

    Correct Answer
    A. 1/2
    Explanation
    In asphalt pavement construction, the compaction process involves rolling the bituminous mix. The rolling starts at the sides of the road and moves longitudinally parallel towards the road centerline. Each trip of the roller overlaps a certain width of the roller itself. Gradually, the compaction progresses towards the crown of the road. The correct answer of 1/2 indicates that each trip of the roller overlaps half of its width. This ensures that the entire surface is evenly compacted and achieves the desired density and strength.

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  • 13. 

    10kgs sample for cement represent

    • 1000bags

    • 2000bags

    • 1500bags

    • 500bags

    Correct Answer
    A. 2000bags
    Explanation
    The correct answer is 2000 bags. This means that a 10kg sample of cement represents 2000 bags.

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  • 14. 

    In Item 310, bituminous surface course, hot laid requires 70% minimum of index of retained strength (IRS). In the immersion-compression test, the dry stability is about 900 psi. Based on the data, the wet stability be at least __ psi.

    • 270

    • 630

    • 1286

    • 830

    Correct Answer
    A. 630
    Explanation
    The question mentions that the bituminous surface course requires a minimum of 70% IRS. The IRS is a measure of the retained strength of the material. The dry stability is given as 900 psi. Since wet stability is expected to be lower than dry stability, the wet stability should be at least 70% of 900 psi, which is 630 psi. Therefore, the correct answer is 630 psi.

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  • 15. 

    __ test determines the amount of asphalt present in a bituminous mix

    • Distillation

    • Extraction

    • Solubility

    • Compression

    Correct Answer
    A. Extraction
    Explanation
    Extraction is a process used to separate one or more components from a mixture by selectively dissolving them in a suitable solvent. In the context of determining the amount of asphalt present in a bituminous mix, extraction would involve dissolving the asphalt in a solvent and separating it from the other components of the mixture. This method allows for the quantification of the asphalt content, making it the correct answer for the given question.

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  • 16. 

    The rate of application of emulsified asphalt used as tack coat, should be within the range of __ liter/sq.m

    • 0.2-0.5

    • 0.2-0.7

    • 0.15-0.7

    • 1.0-2.0

    Correct Answer
    A. 0.2-0.7
    Explanation
    The rate of application of emulsified asphalt used as tack coat should be within the range of 0.2-0.7 liters per square meter. This range allows for enough asphalt to be applied to ensure proper bonding between the layers of asphalt, but not so much that it causes excess runoff or pooling. It is important to apply the correct amount of tack coat to ensure the longevity and durability of the asphalt pavement.

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  • 17. 

    In bituminous mixture, aggregates account for 92%-95% of the weight of the mixture, while asphalt ( the binder of aggregates) accounts for __

    • 3-5%

    • 5-8%

    • 5-10%

    • 7-10%

    Correct Answer
    A. 5-8%
    Explanation
    In bituminous mixture, aggregates make up the majority of the weight, ranging from 92% to 95%. The remaining portion is occupied by asphalt, which acts as the binder for the aggregates. The correct answer, 5-8%, falls within this range and represents the proportion of asphalt in the bituminous mixture.

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  • 18. 

    The type of asphaltic material that is usually classified by its viscosity is

    • Liquid asphalt

    • Blown asphalt

    • Rock asphalt

    • Lake asphalt

    Correct Answer
    A. Liquid asphalt
    Explanation
    Liquid asphalt is the type of asphaltic material that is usually classified by its viscosity. Viscosity refers to the thickness or resistance to flow of a substance. Liquid asphalt has a relatively low viscosity, meaning it is less thick and flows more easily compared to other types of asphalt such as blown asphalt, rock asphalt, or lake asphalt. This classification based on viscosity helps in determining the appropriate use and application of different types of asphalt in construction and paving projects.

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  • 19. 

    If the maximum required LL for base course is 25, what is for the subbase course?

    • 35

    • 20

    • 25

    • 40

    Correct Answer
    A. 35
    Explanation
    The maximum required LL for the subbase course is 35. This is because the subbase course is typically designed to have a higher load-bearing capacity compared to the base course. Therefore, a higher maximum required LL is needed to ensure that the subbase course can withstand heavier loads without experiencing failures or deformations.

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  • 20. 

    Sample for CBR determination should be soaked for how many days?

    • 5 days

    • 4 days

    • 3 days

    • 2 days

    Correct Answer
    A. 4 days
    Explanation
    The sample for CBR determination should be soaked for 4 days. Soaking the sample allows it to reach its maximum swelling potential, which is important for accurately determining its California Bearing Ratio (CBR). A longer soaking period may lead to over-swelling, while a shorter period may result in an underestimation of the CBR value. Therefore, soaking the sample for 4 days ensures that it is adequately saturated and ready for testing.

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  • 21. 

    Minimum required temperature when asphalt mix is placed at site

    • 110 degrees celsius

    • 107 degrees celsius

    • 100 degrees celsius

    • 115 degrees celsius

    Correct Answer
    A. 107 degrees celsius
    Explanation
    The minimum required temperature when asphalt mix is placed at the site is 107 degrees Celsius. This temperature is necessary to ensure proper compaction and bonding of the asphalt mix. At this temperature, the asphalt mix becomes more workable and easier to spread and compact. Placing the mix at a lower temperature may result in poor compaction and reduced durability of the pavement. Conversely, placing the mix at a higher temperature may cause excessive cooling and premature hardening, leading to inadequate compaction and potential pavement failure. Therefore, 107 degrees Celsius is the correct minimum temperature for placing asphalt mix at the site.

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  • 22. 

    A compacted bituminous pavement shall have a minimum density of equal to or greater than __ %

    • 85

    • 90

    • 95

    • 100

    Correct Answer
    A. 95
    Explanation
    A compacted bituminous pavement should have a minimum density of 95% or greater. This means that the pavement should have at least 95% of the maximum possible density when it is compacted. Achieving a high density is important for the durability and longevity of the pavement, as it helps to ensure that the pavement is strong and resistant to damage from traffic and environmental factors. A higher density also helps to reduce the permeability of the pavement, preventing water from seeping into the layers below and causing damage.

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  • 23. 

    Based on the minimum testing requirements for Item 309, bituminous plant mix, general, one quality test for asphaltic material requires for every __ tonnes or fraction thereof.

    • 40

    • 50

    • 60

    • 70

    Correct Answer
    A. 40
    Explanation
    According to the minimum testing requirements for Item 309, bituminous plant mix, general, one quality test for asphaltic material is required for every 40 tonnes or fraction thereof. This means that for every 40 tonnes of asphaltic material, a quality test needs to be conducted to ensure its quality and compliance with standards.

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  • 24. 

    Another name for joint filler is

    • Asphalt cement

    • Cutback asphalt

    • Mineral filler

    • Blown asphalt

    Correct Answer
    A. Blown asphalt
    Explanation
    Blown asphalt is another name for joint filler. This substance is commonly used to fill gaps and joints in construction projects. Blown asphalt is a type of asphalt cement that has been modified by a process called blowing, which increases its viscosity and makes it suitable for filling joints and gaps. It is a durable and flexible material that helps to prevent water infiltration and maintain the structural integrity of the construction.

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  • 25. 

    Mortar ratio for riprap

    • 1:3

    • 1:2

    • 1:1

    • 1:4

    Correct Answer
    A. 1:3
    Explanation
    The correct answer is 1:3. This ratio means that for every part of cement (1), there should be three parts of sand (3) in the mortar mixture. This ratio is commonly used for riprap, which is a layer of large stones or concrete blocks used to protect shorelines or slopes from erosion. The 1:3 ratio ensures a strong and durable mortar that can withstand the forces of water and weathering.

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  • 26. 

    The maximum required plasticity index for base course is 6. What is for the subbase course.

    • 4 to 9

    • 12

    • 4 to 7

    • 3 to 10

    Correct Answer
    A. 12
  • 27. 

    In extraction test of compacted mix the Wt, of original sample is 850 gms. And the Wt. After extraction is 802 gms. The bitumen content percent by mass of aggregate will be __ percent.

    • 6

    • 5.98

    • 5

    • 8

    Correct Answer
    A. 5.98
    Explanation
    The bitumen content percent by mass of aggregate can be calculated by subtracting the weight after extraction (802 g) from the weight of the original sample (850 g), which gives us the weight of the bitumen (48 g). Then, we divide the weight of the bitumen by the weight of the original sample and multiply by 100 to get the percentage. Therefore, the bitumen content percent by mass of aggregate is 5.65 percent.

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  • 28. 

    The actual cementing power in asphalt is called the __

    • Petrolene

    • Asphaltene

    • Bitumen

    • Resin

    Correct Answer
    A. Bitumen
    Explanation
    Bitumen is the correct answer because it is the actual cementing power in asphalt. Bitumen is a sticky, black, and highly viscous liquid or semi-solid form of petroleum. It acts as a binder, holding the asphalt mixture together and providing its adhesive properties. Bitumen is responsible for the strength and durability of asphalt pavement, allowing it to withstand heavy traffic and harsh weather conditions.

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  • 29. 

    Emulsified asphalt that has a positive charge particle is usually classified

    • Anionic

    • Cationic

    • Pozzolanic

    • Ultrasonic

    Correct Answer
    A. Cationic
    Explanation
    Emulsified asphalt that has a positive charge particle is usually classified as cationic. This classification is based on the type of emulsifying agent used, which is typically a cationic surfactant. The positive charge of the emulsifying agent allows it to effectively stabilize the asphalt particles in water, resulting in a stable emulsion. Cationic emulsified asphalt is commonly used in road construction and maintenance due to its superior adhesion and durability.

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  • 30. 

    Mortar ratio for stone masonry

    • 1:3

    • 1:2

    • 1:1

    • 1:4

    Correct Answer
    A. 1:2
    Explanation
    The correct answer is 1:2. In stone masonry, the mortar ratio refers to the proportion of cement to sand used in the mixture. A ratio of 1:2 means that for every part of cement, two parts of sand are used. This ratio is commonly used in stone masonry as it provides a good balance between strength and workability. It ensures that the mortar has enough cement content to bond the stones together effectively while also allowing for easy application and manipulation during construction.

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  • 31. 

    Minimum required flexural strength for concrete beam sample for concrete pavement

    • 3.8 Mpa

    • 4.5 Mpa

    • 4.0 Mpa

    • 3.9 Mpa

    Correct Answer
    A. 3.8 Mpa
    Explanation
    The minimum required flexural strength for a concrete beam sample for a concrete pavement is 3.8 Mpa. This means that the concrete beam must be able to withstand a minimum bending stress of 3.8 Mpa without breaking or failing. This is an important requirement for concrete pavements as they need to be able to support heavy loads and resist cracking or breaking under traffic.

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  • 32. 

    The type of asphaltic material that is being referred to by penetration grade is

    • Emulsified asphalt

    • Cutback asphalt

    • Asphalt cement

    • Mastic asphalt

    Correct Answer
    A. Asphalt cement
    Explanation
    Penetration grade refers to the measure of hardness or consistency of asphalt. It is determined by the depth in tenths of a millimeter that a standard needle will penetrate vertically into an asphalt sample under specified conditions of loading, time, and temperature. Asphalt cement is the correct answer because it is the base material used in the production of asphalt concrete. It is a semi-solid form of petroleum that is heated and mixed with aggregates to create asphalt pavement. Emulsified asphalt, cutback asphalt, and mastic asphalt are different forms of asphalt that have undergone additional processing or have additives mixed in.

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  • 33. 

    Civil Service law

    • RA 1080

    • RA 554

    • RA 544

    • RA 344

    Correct Answer
    A. RA 1080
    Explanation
    RA 1080 is the correct answer because it is the law that governs the civil service in the Philippines. It establishes the qualifications and standards for entrance and promotion in the civil service, as well as the rules and regulations for disciplinary actions and removal from office. RA 1080 ensures that the civil service operates in a fair and efficient manner, promoting professionalism, integrity, and meritocracy in public service. The other options, RA 554, RA 544, and RA 344, are not relevant to the civil service law and do not pertain to the regulation of the civil service.

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  • 34. 

    The softness and hardness of an asphaltic materials can be determined by ___ test

    • Softening point

    • Loss on heating

    • Penetration

    • Distillation

    Correct Answer
    A. Penetration
    Explanation
    Penetration test is used to determine the softness and hardness of asphaltic materials. It measures the depth to which a standard needle penetrates the asphalt sample under specific conditions of time, temperature, and applied force. The penetration value obtained from the test indicates the consistency and stiffness of the asphalt, with higher penetration values indicating softer materials and lower values indicating harder materials. Therefore, penetration test is the appropriate method for evaluating the softness and hardness of asphaltic materials.

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  • 35. 

    For thickness determination of compacted asphalt concrete cores shall done,

    • In 9 measurement

    • In 4 measurement

    • In 8 measurement

    • In 6 measurement

    Correct Answer
    A. In 4 measurement
    Explanation
    The correct answer is "in 4 measurement". This means that the thickness determination of compacted asphalt concrete cores should be done by taking measurements at four different points. This is likely the most accurate and reliable method to determine the thickness of the asphalt concrete cores.

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  • 36. 

    Initial compaction of asphalt mis is done by

    • Tandem roller not less than 10 tons

    • Pneumatic tired roller not less than 10 tons

    • Sheepsfoot roller not less than 10 tons

    • All of the above

    Correct Answer
    A. Pneumatic tired roller not less than 10 tons
    Explanation
    The initial compaction of asphalt mix is done by a pneumatic tired roller not less than 10 tons. This type of roller is specifically designed for compacting asphalt surfaces. It uses a combination of weight and pneumatic tires to effectively compact the asphalt mix, ensuring proper density and smoothness. The use of a roller with a minimum weight of 10 tons is important to achieve the required compaction levels and ensure the durability and longevity of the asphalt pavement.

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  • 37. 

    Bituminous material used for treating an aggregate base course before an asphalt mix overlay

    • Seal coat

    • Prime coat

    • Tack coat

    • Any of the above

    Correct Answer
    A. Prime coat
    Explanation
    A prime coat is a bituminous material that is applied to the aggregate base course before an asphalt mix overlay. It serves as a bonding agent between the base course and the asphalt mix, improving the adhesion and preventing water infiltration. The prime coat also helps to seal the surface of the base course, reducing dust and providing a smooth and uniform surface for the overlay. Therefore, the prime coat is the correct answer for the given question.

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  • 38. 

    Materials smaller than 0.001mm

    • Clay

    • Colloids

    • Silt

    • Sand

    Correct Answer
    A. Colloids
    Explanation
    Colloids are substances that have particles smaller than 0.001mm in size. They are larger than molecules but smaller than particles found in clay, silt, and sand. Colloids have the ability to remain suspended in a solution without settling due to their small size and the repulsion between their particles. This property makes colloids useful in various industries such as medicine, food, and cosmetics.

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  • 39. 

    The required speed of roller in compacting asphalt concrete mix

    • 8 kph

    • 5 kph

    • 6 kph

    • 10 kph

    Correct Answer
    A. 5 kph
    Explanation
    The required speed of the roller in compacting asphalt concrete mix is 5 kph. This speed is determined based on the optimal compaction and smoothness of the asphalt surface. A speed of 5 kph allows the roller to apply the right amount of pressure and vibration to effectively compact the asphalt mix, ensuring proper density and durability of the pavement. Higher speeds may lead to inadequate compaction, while lower speeds may result in over-compaction or uneven surfaces.

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  • 40. 

    The control of temperature during the mixing and compaction is of great significance in the __ of the resulting pavement

    • Strength

    • Skid resistance

    • Flexibility

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Controlling the temperature during the mixing and compaction process is crucial because it directly affects the strength, skid resistance, and flexibility of the resulting pavement. Temperature control ensures that the pavement achieves the desired strength, which is essential for withstanding heavy loads and traffic. It also helps in maintaining the appropriate skid resistance, which is necessary for vehicles to have proper traction on the road surface. Additionally, temperature control plays a role in ensuring the flexibility of the pavement, allowing it to withstand thermal expansion and contraction without cracking or deteriorating. Thus, all of the mentioned factors are influenced by temperature control during the mixing and compaction process.

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  • 41. 

    An asphalt cement can be a good bituminous binder material for Item

    • 301

    • 302

    • 308

    • 310

    Correct Answer
    A. 310
    Explanation
    An asphalt cement can be a good bituminous binder material for Item 310.

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  • 42. 

    The following are the responsibility of the materials engineer, except

    • Witness testing of materials

    • Supervise sampling

    • Check and inspect materials logbook

    • Peprare or check concrete design mix

    Correct Answer
    A. Check and inspect materials logbook
    Explanation
    The materials engineer is responsible for various tasks related to materials testing and quality control. They are responsible for witness testing of materials, which involves observing and verifying the testing process to ensure accurate results. They also supervise sampling to ensure that proper procedures are followed and representative samples are collected. Additionally, they are responsible for preparing or checking concrete design mix to ensure that it meets the required specifications. However, checking and inspecting materials logbook is not typically a responsibility of a materials engineer. This task is usually assigned to a materials technician or a quality control inspector.

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  • 43. 

    For 5,000 units of hollow blocks. How many samples shall be taken for strength, moisture and absorption determination.

    • 5 units

    • 3 units

    • 6 units

    • 1 unit

    Correct Answer
    A. 6 units
    Explanation
    To determine the strength, moisture, and absorption of the hollow blocks, it is necessary to take samples. The correct answer is 6 units because taking multiple samples ensures a more accurate representation of the overall quality of the entire batch of 5,000 units. By taking 6 units as samples, a sufficient number of blocks are tested to provide reliable data on the strength, moisture, and absorption levels.

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  • 44. 

    Minimum cement content per cu.m for class P concrete.

    • 10

    • 9.5

    • 11

    • 9

    Correct Answer
    A. 11
    Explanation
    The minimum cement content per cubic meter for class P concrete is 11. This means that for every cubic meter of class P concrete, a minimum of 11 kilograms of cement should be used. This requirement ensures that the concrete has sufficient strength and durability for its intended use. Using a lower cement content could result in weaker and less durable concrete.

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  • 45. 

    The thinnest and most fluid grade of medium curing cutback asphalt is: 

    • MC-800

    • MC-250

    • MC-70

    • MC-30

    Correct Answer
    A. MC-30
    Explanation
    MC-30 is the correct answer because it refers to the thinnest and most fluid grade of medium curing cutback asphalt. The "MC" in the answer options stands for medium curing, and the number following it indicates the viscosity of the asphalt. Since MC-30 has the lowest number, it indicates the thinnest and most fluid grade among the options provided.

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  • 46. 

    __ test compares the compressive strength of dry and wet specimen of bituminous mix

    • Marshall stability

    • Immersion-compression

    • Extraction

    • Bulk specific gravity

    Correct Answer
    A. Immersion-compression
    Explanation
    The correct answer is immersion-compression. Immersion-compression test is used to compare the compressive strength of dry and wet specimens of bituminous mix. This test involves immersing the specimen in water for a specific period of time and then subjecting it to compressive loading. By comparing the compressive strength of the dry and wet specimens, the effect of moisture on the stability of the bituminous mix can be determined. This test helps in evaluating the durability and performance of the bituminous mix under wet conditions.

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  • 47. 

    The test in emulsified asphalt which determines the resisitance of the emulsion to break when mixed with mineral aggregates

    • Solubility

    • Sieve test

    • Cement mixing

    • Storage stability

    Correct Answer
    A. Cement mixing
    Explanation
    Cement mixing is the correct answer because it refers to the test in emulsified asphalt that determines the resistance of the emulsion to break when mixed with mineral aggregates. This test involves mixing the emulsion with cement and observing whether it breaks or remains stable. The result of this test helps determine the quality and effectiveness of the emulsion in binding the mineral aggregates together.

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  • 48. 

    Require plasticity index for base course

    • 6

    • 4 to 9

    • 12

    • 10

    Correct Answer
    A. 6
    Explanation
    The plasticity index is a measure of the range of moisture content over which a soil can exhibit plastic behavior. For a base course, which is the layer of material beneath the pavement, a plasticity index of 6 is required. This indicates that the soil should have a moderate range of moisture content where it can be easily compacted and provide sufficient stability for the pavement above. A plasticity index of 6 suggests that the soil is neither too plastic nor too non-plastic, making it suitable for the base course application.

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  • 49. 

    Minimum soaked CBR for aggregate base course

    • 75%

    • 80%

    • 70%

    • 60%

    Correct Answer
    A. 80%
    Explanation
    The correct answer is 80%. In the context of aggregate base course, CBR (California Bearing Ratio) is a measure of the strength of the material. A higher CBR indicates a stronger material. Therefore, a minimum soaked CBR of 80% is required for the aggregate base course, meaning that the material needs to have a high strength and stability when subjected to moisture.

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Quiz Review Timeline (Updated): Sep 14, 2023 +

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  • Current Version
  • Sep 14, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Aug 15, 2016
    Quiz Created by
    Matthewsdizon
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