Materials 2
Questions and Answers
- 1.
__ test determines the amount of asphalt present in a bituminous mix
- A.
Distillation
- B.
Extraction
- C.
Solubility
- D.
Compression
Correct Answer
B. ExtractionExplanation
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.Rate this question:
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- 2.
The softness and hardness of an asphaltic materials can be determined by ___ test
- A.
Softening point
- B.
Loss on heating
- C.
Penetration
- D.
Distillation
Correct Answer
C. PenetrationExplanation
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.Rate this question:
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- 3.
The temperature of bituminous hot mix delivered in the project site should not be less than its __ temperature.
- A.
Mixing
- B.
Compaction
- C.
Molding
- D.
Spreading
Correct Answer
B. CompactionExplanation
The temperature of bituminous hot mix should not be less than its compaction temperature. Compaction is the process of reducing the air voids in the mix by applying pressure, which helps in achieving a dense and durable pavement. If the temperature of the mix is lower than its compaction temperature, it may not achieve the desired density, leading to poor pavement performance. Therefore, it is crucial to ensure that the mix temperature is maintained at or above its compaction temperature during construction.Rate this question:
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- 4.
Resistance to deformation of bituminous mixture is measured by ___
- A.
Flow index
- B.
Index of retained strength
- C.
Ductility test
- D.
Extraction test
Correct Answer
A. Flow indexExplanation
The resistance to deformation of bituminous mixture is measured by the flow index. The flow index is a measure of the ability of the bituminous mixture to flow under a specified load and temperature. It indicates the viscosity and stiffness of the mixture, with a higher flow index indicating a more fluid and less resistant mixture. This test is commonly used in the evaluation of bituminous materials for road construction to ensure their durability and performance under traffic loads.Rate this question:
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- 5.
The apparatus used in determining the grade of asphalt cement is
- A.
Hydrometer
- B.
Penetromanometer
- C.
Petronmeter
- D.
Penetrometer
Correct Answer
D. PenetrometerExplanation
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.Rate this question:
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- 6.
In an Immersion-Compression test, molding of specimen is done into ___ layers
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
B. 2Explanation
In an Immersion-Compression test, the molding of the specimen is done into two layers. This means that the specimen is divided into two distinct parts or sections. This could be done for various reasons such as ensuring uniformity in the test, separating different materials or components within the specimen, or facilitating the application of compression force. By dividing the specimen into two layers, it becomes easier to analyze and evaluate its behavior under compression.Rate this question:
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- 7.
In Marshall Stability, molding of specimen is done into __ layer
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
A. 1Explanation
In Marshall Stability, the molding of the specimen is done into one layer. This means that the specimen is compacted and formed into a single layer before testing. Molding the specimen into one layer allows for consistent and accurate testing of its stability and strength. It ensures that the specimen is uniformly compacted and eliminates any variations that may occur if it were molded into multiple layers.Rate this question:
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- 8.
The actual cementing power in asphalt is called the __
- A.
Petrolene
- B.
Asphaltene
- C.
Bitumen
- D.
Resin
Correct Answer
C. BitumenExplanation
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.Rate this question:
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- 9.
An asphalt pavement needs sufficient ___ to avoid flushing or bleeding
- A.
Compaction
- B.
Air voids
- C.
Binder
- D.
Mineral filler
Correct Answer
B. Air voidsExplanation
Air voids in an asphalt pavement are necessary to prevent flushing or bleeding. Flushing occurs when excess asphalt binder rises to the surface of the pavement, creating a slick and shiny appearance. Bleeding, on the other hand, happens when the asphalt binder seeps out of the pavement, leading to a sticky and tacky surface. By having sufficient air voids in the pavement, the excess binder has space to move and distribute evenly, reducing the likelihood of flushing or bleeding.Rate this question:
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- 10.
A job-mix formula provides for close control of
- A.
Asphalt content
- B.
Aggregate gradation
- C.
Temperature of asphalt, aggregate and mix
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
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.Rate this question:
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- 11.
The thinnest and most fluid grade of medium curing cutback asphalt is:
- A.
MC-800
- B.
MC-250
- C.
MC-70
- D.
MC-30
Correct Answer
D. MC-30Explanation
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.Rate this question:
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- 12.
The amount of asphalt in a typical asphalt emulsion is
- A.
40%
- B.
50%
- C.
60%
- D.
70%
Correct Answer
C. 60%Explanation
The correct answer is 60% because a typical asphalt emulsion contains a mixture of asphalt binder and water, with the asphalt binder typically making up around 60% of the total emulsion. This ratio ensures that the emulsion has the right consistency and properties for various construction and paving applications.Rate this question:
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- 13.
Another name for joint filler is
- A.
Asphalt cement
- B.
Cutback asphalt
- C.
Mineral filler
- D.
Blown asphalt
Correct Answer
D. Blown aspHaltExplanation
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.Rate this question:
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- 14.
The type of asphaltic material that is usually classified by its viscosity is
- A.
Liquid asphalt
- B.
Blown asphalt
- C.
Rock asphalt
- D.
Lake asphalt
Correct Answer
A. Liquid aspHaltExplanation
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.Rate this question:
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- 15.
Item 310, bituminous surface course, hot laid provides an air voids between
- A.
3-5%
- B.
5-7%
- C.
5-8%
- D.
8-10%
Correct Answer
A. 3-5%Explanation
The correct answer is 3-5%. Bituminous surface course, when hot laid, provides an air voids percentage of 3-5%. This means that during the paving process, the bituminous mixture will have a certain amount of air voids within it. These air voids are important as they allow for proper compaction and drainage, ensuring that the surface course is durable and long-lasting. Having too many or too few air voids can lead to issues such as rutting, cracking, or poor skid resistance. Therefore, maintaining the correct air voids percentage is crucial for the performance of the bituminous surface course.Rate this question:
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- 16.
Emulsified asphalt that has a positive charge particle is usually classified
- A.
Anionic
- B.
Cationic
- C.
Pozzolanic
- D.
Ultrasonic
Correct Answer
B. CationicExplanation
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.Rate this question:
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- 17.
The characteristics of a butuminous mix that indicates to disintegration is called
- A.
Stability
- B.
Flexibility
- C.
Durability
- D.
Integrity
Correct Answer
C. DurabilityExplanation
Durability is the characteristic of a bituminous mix that indicates its resistance to disintegration. A durable mix will be able to withstand the effects of traffic, weather, and aging without breaking down or deteriorating. This is an important quality for road surfaces as it ensures the longevity and performance of the pavement. Stability refers to the ability of the mix to resist deformation under traffic loads, flexibility refers to its ability to withstand bending without cracking, and integrity refers to its overall soundness and completeness. While these characteristics are also important, they do not specifically indicate resistance to disintegration like durability does.Rate this question:
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- 18.
The coarse aggregate used in bituminous mix are those retained at sieve no.
- A.
8
- B.
10
- C.
30
- D.
200
Correct Answer
A. 8Explanation
The coarse aggregate used in bituminous mix is the one that is retained at sieve no. 8. This means that the aggregate particles are larger than the openings in sieve no. 8, but smaller than the openings in sieve no. 10. The use of this specific size of coarse aggregate is important in bituminous mixes as it helps to provide stability, strength, and durability to the pavement. The larger particles help to interlock with each other, creating a strong and stable structure.Rate this question:
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- 19.
__ test compares the compressive strength of dry and wet specimen of bituminous mix
- A.
Marshall stability
- B.
Immersion-compression
- C.
Extraction
- D.
Bulk specific gravity
Correct Answer
B. Immersion-compressionExplanation
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.Rate this question:
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- 20.
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.
- A.
270
- B.
630
- C.
1286
- D.
830
Correct Answer
B. 630Explanation
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.Rate this question:
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- 21.
A compacted bituminous pavement shall have a minimum density of equal to or greater than __ %
- A.
85
- B.
90
- C.
95
- D.
100
Correct Answer
C. 95Explanation
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.Rate this question:
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- 22.
The rate of application of emulsified asphalt used as tack coat, should be within the range of __ liter/sq.m
- A.
0.2-0.5
- B.
0.2-0.7
- C.
0.15-0.7
- D.
1.0-2.0
Correct Answer
B. 0.2-0.7Explanation
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.Rate this question:
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- 23.
The type of asphaltic material that is being referred to by penetration grade is
- A.
Emulsified asphalt
- B.
Cutback asphalt
- C.
Asphalt cement
- D.
Mastic asphalt
Correct Answer
C. AspHalt cementExplanation
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.Rate this question:
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- 24.
The service performance of an asphalt pavement is greatly influence by
- A.
Grade of asphalt
- B.
Quantity of asphalt
- C.
A and b
- D.
None of the above
Correct Answer
C. A and bExplanation
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.Rate this question:
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- 25.
In bituminous mixture, aggregates account for 92%-95% of the weight of the mixture, while asphalt ( the binder of aggregates) accounts for __
- A.
3-5%
- B.
5-8%
- C.
5-10%
- D.
7-10%
Correct Answer
B. 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.Rate this question:
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- 26.
In asphalt pavement, prior to acceptance, a sample of full depth, 150mm x 150mm or 100mm diameter shall be taken by a saw or core drill for __ test
- A.
Thickness determination
- B.
Density
- C.
Stability
- D.
A and b
Correct Answer
D. A and bExplanation
In asphalt pavement, prior to acceptance, a sample of full depth is taken for thickness determination and density test. This is done by using a saw or core drill to extract a sample measuring 150mm x 150mm or 100mm in diameter. The thickness determination test is important to ensure that the pavement meets the required specifications, while the density test is conducted to assess the compactness and quality of the asphalt. Therefore, options a and b are both correct.Rate this question:
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- 27.
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
- A.
1/2
- B.
1
- C.
1 1/2
- D.
2
Correct Answer
A. 1/2Explanation
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.Rate this question:
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- 28.
The control of temperature during the mixing and compaction is of great significance in the __ of the resulting pavement
- A.
Strength
- B.
Skid resistance
- C.
Flexibility
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
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.Rate this question:
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- 29.
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.
- A.
40
- B.
50
- C.
60
- D.
70
Correct Answer
A. 40Explanation
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.Rate this question:
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- 30.
The test in emulsified asphalt which determines the resisitance of the emulsion to break when mixed with mineral aggregates
- A.
Solubility
- B.
Sieve test
- C.
Cement mixing
- D.
Storage stability
Correct Answer
C. Cement mixingExplanation
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.Rate this question:
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- 31.
What Item in the DPWH standards and specification is bituminous tack coat?
- A.
301
- B.
302
- C.
303
- D.
304
Correct Answer
B. 302 -
- 32.
In identifying project location intended for asphalt pavement, which of the following criteria is not appropriate to recommend?
- A.
Drainage facilities is well maintained
- B.
Location is not a typhoon belt area
- C.
Existing base course is stable
- D.
Flood-prone section
Correct Answer
D. Flood-prone sectionExplanation
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.Rate this question:
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- 33.
An asphalt cement can be a good bituminous binder material for Item
- A.
301
- B.
302
- C.
308
- D.
310
Correct Answer
D. 310Explanation
An asphalt cement can be a good bituminous binder material for Item 310.Rate this question:
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- 34.
Which of the following bituminous material is best recommended for sealing weakened place and construction joints of the PCCP.
- A.
Asphalt cement
- B.
Emulsified asphalt
- C.
Cutback asphalt
- D.
Joint filler asphalt
Correct Answer
D. Joint filler aspHaltExplanation
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.Rate this question:
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- 35.
The primary quality control mechanism for the production of asphalt mixtures which will have a high degree of uniformity that will satisfy job requirements is called
- A.
Marshall stability test
- B.
Job mix formula
- C.
Immersion-compression stability test
- D.
A and b
Correct Answer
B. Job mix formulaExplanation
The job mix formula is the primary quality control mechanism for the production of asphalt mixtures that ensures a high degree of uniformity to meet job requirements. It is a specific formula that determines the proportions of different materials, such as aggregates and binders, to be used in the asphalt mixture. By following the job mix formula, the producer can consistently achieve the desired properties and performance of the asphalt mixture, ensuring uniformity and meeting job specifications. The marshall stability test and immersion-compression stability test are testing methods used to evaluate the performance of the asphalt mixture, but they are not the primary quality control mechanisms for achieving uniformity.Rate this question:
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- 36.
When a completed asphalt pavement exhibits too much voids, it is usually caused by the following except of
- A.
Rolling the mixture below the temoerature requirements
- B.
Too much coarse aggregates
- C.
Too little binder
- D.
Too much fine aggregates
Correct Answer
D. Too much fine aggregatesExplanation
When a completed asphalt pavement exhibits too much voids, it is usually caused by factors such as rolling the mixture below the temperature requirements, too much coarse aggregates, or too little binder. However, too much fine aggregates is not a cause for excessive voids in the pavement. Fine aggregates help in filling the voids and improving the density of the mixture, so an excess of fine aggregates would not lead to excessive voids.Rate this question:
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- 37.
Test results from specimen taken from a recently rolled asphalt pavement showed that is total asphalt content is 5.45% by weight of mix. If the asphalt absorbed by the aggregate is 0.95%, the effective asphalt content by weight of mix is
- A.
4.8%
- B.
4.552%
- C.
5.10%
- D.
5.50%
Correct Answer
B. 4.552%Explanation
The effective asphalt content by weight of mix can be calculated by subtracting the asphalt absorbed by the aggregate from the total asphalt content. In this case, the asphalt absorbed by the aggregate is 0.95%. Therefore, the effective asphalt content is 5.45% - 0.95% = 4.552%.Rate this question:
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- 38.
If the dry stability of a bituminous mix is 3,950 lbs and its wet stability is 2,380 lbs., the index of retained strength (IRS) is
- A.
50.20%
- B.
60.13%
- C.
73.20%
- D.
61.10%
Correct Answer
B. 60.13%Explanation
To calculate the Index of Retained Strength (IRS), you can use the following formula:
IRS = (Wet Stability / Dry Stability) * 100%
Plug in the provided values:
IRS = (2,380 lbs / 3,950 lbs) * 100%
Now, calculate it:
IRS = (0.6012658) * 100%
IRS ≈ 60.13%
Rounded to two decimal places, the Index of Retained Strength (IRS) is approximately 60.13%.Rate this question:
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- 39.
The voids in the mineral aggregate (VMA) is
- A.
The sum of the air voids and the volume of the mix
- B.
The difference between the volume of the mix and the volume of aggregate
- C.
The sum of the air voids and volume of aggregate
- D.
The difference between the volume of mix and volume of asphalt
Correct Answer
B. The difference between the volume of the mix and the volume of aggregateExplanation
The voids in the mineral aggregate (VMA) is the difference between the volume of the mix and the volume of aggregate. This means that VMA represents the space within the mix that is not occupied by the aggregate particles. It includes both the air voids and any additional voids between the aggregate particles. By calculating the VMA, engineers can determine the amount of space available for the asphalt binder to occupy, which is important for ensuring proper compaction and durability of the asphalt mix.Rate this question:
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- 40.
Minimum size for stone masonry
- A.
200mm
- B.
300mm
- C.
150mm
- D.
400mm
Correct Answer
C. 150mmExplanation
The minimum size for stone masonry is 150mm. Stone masonry refers to the construction technique of using stones as building materials. The size of the stones used in masonry plays a crucial role in the strength and stability of the structure. Smaller stones are easier to handle and place, and they also provide a better bond between the stones. Therefore, a minimum size of 150mm is considered adequate for stone masonry to ensure a durable and stable construction.Rate this question:
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- 41.
Mortar ratio for stone masonry
- A.
1:3
- B.
1:2
- C.
1:1
- D.
1:4
Correct Answer
B. 1:2Explanation
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.Rate this question:
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- 42.
Mortar ratio for riprap
- A.
1:3
- B.
1:2
- C.
1:1
- D.
1:4
Correct Answer
A. 1:3Explanation
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.Rate this question:
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- 43.
Minimum size for class A stones
- A.
300mm
- B.
200mm
- C.
400mm
- D.
500mm
Correct Answer
A. 300mmExplanation
The minimum size for class A stones is 300mm. This means that any stone that is smaller than 300mm would not be classified as a class A stone.Rate this question:
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- 44.
Concrete in the area represented by the cores will be considered if the average strength of the cores is equal to:
- A.
At least 75% of and no single core is less than 85% the specified strength fc'
- B.
At least 85% of and no single core is less than 75% the specified strength fc'
- C.
At least equal or exceed specified strength fc' and no single strength test less than 20% of the specified strength fc'
- D.
At least equal or exceed specified strength fc' and no single strength test less than 10% of the specified strength fc'
Correct Answer
B. 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.Rate this question:
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- 45.
Job mix tolerance for bituminous material
- A.
+-7%
- B.
+-2%
- C.
+-0.4%
- D.
+-4%
Correct Answer
C. +-0.4%Explanation
The correct answer is +-0.4%. The job mix tolerance for bituminous material refers to the allowable range of variation in the percentage of bituminous material used in a specific job. A tolerance of +-0.4% means that the actual percentage of bituminous material used can vary by plus or minus 0.4% from the specified target percentage. This level of tolerance ensures that there is a small margin for error and allows for slight variations in the material without significantly affecting the quality or performance of the final product.Rate this question:
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- 46.
Required percent air voids for asphalt mix
- A.
2 to 3
- B.
3 to 5
- C.
4 to 8
- D.
4 to 7
Correct Answer
B. 3 to 5Explanation
The required percent air voids for an asphalt mix is typically between 3 to 5. This range allows for proper compaction and durability of the asphalt pavement. If the air voids are too low, it can lead to rutting and moisture damage. On the other hand, if the air voids are too high, it can result in a weaker pavement and reduced resistance to cracking. Therefore, the optimal range of 3 to 5 percent air voids ensures a balance between strength and flexibility in the asphalt mix.Rate this question:
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- 47.
The proportion of bituminous material, on the basis of total gry aggregates
- A.
92 to 95 %
- B.
5 to 8 %
- C.
5 to 10%
- D.
6 to 12%
Correct Answer
B. 5 to 8 %Explanation
The correct answer is 5 to 8%. This means that the proportion of bituminous material, based on the total dry aggregates, should be between 5% and 8%. This range ensures that there is enough bituminous material to provide strength and durability to the mixture, while also allowing for proper compaction and workability during construction.Rate this question:
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- 48.
Required sample of asphalt mix per 130 metric ton
- A.
70kg
- B.
50kg
- C.
20kg
- D.
40kg
Correct Answer
C. 20kgExplanation
The given question asks for the required sample of asphalt mix per 130 metric tons. The answer provided is 20kg. This means that for every 130 metric tons of asphalt mix, a sample of 20kg is needed.Rate this question:
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- 49.
10kgs sample for cement represent
- A.
1000bags
- B.
2000bags
- C.
1500bags
- D.
500bags
Correct Answer
B. 2000bagsExplanation
The correct answer is 2000 bags. This means that a 10kg sample of cement represents 2000 bags.Rate this question:
-
- 50.
Require plasticity index for aggregate surface course
- A.
6
- B.
4 to 9
- C.
12
- D.
10
Correct Answer
B. 4 to 9Explanation
The plasticity index is a measure of the range of moisture content over which a soil exhibits plastic behavior. For an aggregate surface course, it is important to have a certain level of plasticity to ensure that the material can be compacted and shaped properly during construction. A plasticity index of 4 to 9 indicates a moderate level of plasticity, which would be suitable for achieving the desired compaction and shaping of the aggregate surface course.Rate this question:
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Quiz Review Timeline +
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Current Version
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Sep 14, 2023Quiz Edited by
ProProfs Editorial Team -
Aug 15, 2016Quiz Created by
Matthewsdizon
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