Materials 4

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  • 1/100 Questions

    What is the dimension of concrete cylindrical sample?

    • 6" dia and 12" high
    • 4" dia and 8" high
    • 8" dia and 14" high
    • 4" dia and 12" high
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About This Quiz

This 'materials 4' quiz assesses knowledge on concrete handling, including weighing aggregates, mixing times, and water-cement ratios. It's designed for learners in construction and civil engineering to ensure precision and compliance in material management.

Civil Engineering Quizzes & Trivia

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  • 2. 

    Proper compaction of the fill materials is very important, as it will ___

    • Increase the shear strength

    • Decrease permeability

    • Minimize compressibility

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Proper compaction of the fill materials is important because it has multiple positive effects. Firstly, it increases the shear strength of the materials, making them more resistant to sliding or deformation. Secondly, it decreases permeability, meaning that the compacted fill materials are less likely to allow water or other fluids to pass through them. Lastly, proper compaction helps minimize compressibility, ensuring that the fill materials settle and consolidate evenly, reducing the potential for future settlement or uneven subsidence. Therefore, all of the given options are correct.

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  • 3. 

    ___ is an indication that the asphalt mix is overheated

    • Blue smoke

    • Stiff appearance

    • Rising steam

    • Mix slumps in truck

    Correct Answer
    A. Blue smoke
    Explanation
    Blue smoke is an indication that the asphalt mix is overheated. When the mix is overheated, the asphalt binder can start to burn, producing blue smoke. This can happen if the mix is heated at a temperature higher than the recommended range. The presence of blue smoke suggests that the asphalt mix may have undergone thermal degradation, which can affect its performance and durability. Therefore, it is important to monitor the temperature of the asphalt mix during the heating process to prevent overheating and potential issues with the final pavement quality.

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  • 4. 

    Sample from bituminous mix weighs 1000 grams. At extraction, it was found out that the dry aggregate weighed 950 grams. What is the % of asphalt by weight of mix?

    • 5.2%

    • 5.0%

    • 5.4%

    • 4.8%

    Correct Answer
    A. 5.0%
    Explanation
    The weight of the asphalt can be calculated by subtracting the weight of the dry aggregate from the weight of the sample. In this case, the weight of the asphalt is 1000 grams - 950 grams = 50 grams. To find the percentage of asphalt by weight of the mix, we divide the weight of the asphalt by the weight of the mix and multiply by 100. Therefore, the percentage of asphalt by weight of the mix is (50 grams / 1000 grams) * 100 = 5.0%.

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  • 5. 

    It indicates good subbase materials when GI is equal to ___

    • 0

    • 5

    • 10

    • 20

    Correct Answer
    A. 0
    Explanation
    A GI (Grading Index) value of 0 indicates good subbase materials. This means that the subbase materials have a well-graded particle size distribution, with a good balance of different sizes of particles. A well-graded subbase material allows for better compaction and stability, providing a solid foundation for construction or other applications.

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  • 6. 

    The apparatus/equipment used in the liquid limit and plastic limit test is called ___

    • Sieves and chisel

    • Atterberg device and glass plate

    • Mortar and pestle

    • Sieves and mortar

    Correct Answer
    A. Atterberg device and glass plate
    Explanation
    The correct answer is atterberg device and glass plate. In the liquid limit and plastic limit test, the atterberg device is used to determine the moisture content at which soil changes from a liquid to a plastic state. It consists of a cup, a groove, and a crank mechanism. The glass plate is used to roll the soil into a thread-like shape during the test. Sieves and chisel are not used in this specific test, and mortar and pestle are typically used for grinding and mixing substances, not for the liquid limit and plastic limit test.

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  • 7. 

    When cement is placed in contact with the aggregate, batches may be rejected unless mixed within ___ hours of such contact.

    • 1.5 hours

    • 2.0 hours

    • 0.5 hours

    • 2.5 hours

    Correct Answer
    A. 1.5 hours
    Explanation
    When cement comes into contact with the aggregate, a chemical reaction called hydration begins. This reaction causes the cement to harden and bind the aggregate particles together. If the cement and aggregate are not mixed within a certain timeframe, the hydration process may already be underway, leading to a weaker bond between the cement and aggregate. Therefore, if the mixing is not done within 1.5 hours of contact, the batches may be rejected to ensure the strength and quality of the final product.

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  • 8. 

    Concrete not place within ___ minutes from the time the ingredients were charged into the mixing drum shall be used

    • 120 minutes

    • 150 minutes

    • 60 minutes

    • 90 minutes

    Correct Answer
    A. 90 minutes
    Explanation
    Concrete that is not placed within 90 minutes from the time the ingredients were charged into the mixing drum should not be used. This is because concrete starts to set and harden after a certain period of time, known as the initial setting time. If concrete is not placed within this time frame, it may not have the desired strength and durability when it eventually hardens. Therefore, it is important to use concrete within the specified time limit to ensure the quality of the final product.

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  • 9. 

    The contractor shall submit in writing a job-mix formula for the mixture supported by laboratory test data along with samples of resources of components and viscocity - temperature relationship to the Engineer for testing and approval at least

    • Two weeks

    • Three weeks

    • One week

    • Four weeks

    Correct Answer
    A. Three weeks
    Explanation
    The contractor is required to submit a job-mix formula, along with laboratory test data and samples of resources, to the Engineer for testing and approval. This process takes a certain amount of time, and the contractor is given a deadline to submit these documents. In this case, the deadline is three weeks. This allows the Engineer enough time to review and test the mixture before approving it for use.

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  • 10. 

    The concrete sample should be stored in a moist conditioned temperature within the range of ___ until the time of test.

    • 18 deg C to 24 deg C

    • 15 deg C to 18 deg C

    • 14 deg C to 24 deg C

    • 18 deg C to 28 deg C

    Correct Answer
    A. 18 deg C to 24 deg C
    Explanation
    The concrete sample should be stored in a moist conditioned temperature within the range of 18 deg C to 24 deg C until the time of the test. This temperature range is ideal for maintaining the integrity and properties of the concrete sample. Higher temperatures can cause the concrete to cure too quickly, leading to potential strength and durability issues. Lower temperatures can slow down the curing process, resulting in delays in testing and potential variations in the final properties of the concrete. Therefore, the specified temperature range ensures optimal conditions for accurate and reliable test results.

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  • 11. 

    The penetration test is an indication of the ___ of asphalt

    • Consistency

    • Softness

    • Hardness

    • Flash point

    Correct Answer
    A. Consistency
    Explanation
    The penetration test is a method used to measure the consistency of asphalt. It involves measuring the depth in which a standard needle penetrates into the asphalt sample under specific conditions. The penetration value obtained indicates the consistency of the asphalt, with lower values indicating harder asphalt and higher values indicating softer asphalt. Therefore, the correct answer is consistency.

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  • 12. 

    The higher the value of PI of the soil, the weaker will be the soil performance as a ___

    • True

    • False

    • Depend

    • None of the above

    Correct Answer
    A. True
    Explanation
    The higher the value of PI (Plasticity Index) of the soil, the weaker will be the soil performance as a construction material. This is because a higher PI indicates that the soil has a higher clay content, which leads to increased plasticity and reduced strength. Clay soils have a tendency to shrink and swell with changes in moisture content, causing instability and potential damage to structures built on them. Therefore, a higher PI value signifies weaker soil performance.

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  • 13. 

    The different test for soil classification are

    • Compaction and FDT

    • Hydrometer test and moisture content

    • Grading, LL and PL test

    • FDT and moisture content

    Correct Answer
    A. Grading, LL and PL test
    Explanation
    The correct answer is grading, LL and PL test. These tests are commonly used for soil classification. Grading refers to the analysis of particle size distribution in the soil sample. LL (Liquid Limit) and PL (Plastic Limit) tests determine the plasticity characteristics of the soil, helping to classify it into different groups. These tests provide valuable information about the behavior and suitability of the soil for various engineering applications.

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  • 14. 

    Submission of sample for testing for cement is ___

    • 10 kg

    • 20 kg

    • 15 kg

    • 40 kg

    Correct Answer
    A. 10 kg
    Explanation
    The submission of a sample for testing for cement typically requires a small amount, usually around 10 kg. This quantity is sufficient for conducting various tests to determine the quality, strength, and other properties of the cement. It is important to use a representative sample to ensure accurate and reliable test results.

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  • 15. 

    ___ is the limit were further loss of water due to evaporation which will not result in reduction of volume

    • Plastic limit

    • Liquid limit

    • Shrinkage limit

    • Plasticity index

    Correct Answer
    A. Shrinkage limit
    Explanation
    The shrinkage limit refers to the point at which further loss of water due to evaporation will not result in a reduction of volume. In other words, it is the minimum moisture content at which a soil will not shrink any further. This limit is important in determining the soil's ability to retain water and its susceptibility to shrinkage and cracking.

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  • 16. 

    The test that determined pile bearing capacity by loading one or more pile and measuring settlement under load is ___

    • Vane shear test

    • Plate bearing test

    • Pile load test

    • Gradation test

    Correct Answer
    A. Pile load test
    Explanation
    The correct answer is pile load test. This test is used to determine the bearing capacity of a pile by loading it with one or more weights and measuring the settlement or deformation of the pile under the applied load. This test helps in assessing the load-carrying capacity and performance of the pile in different soil conditions. It is an essential test in the design and construction of deep foundations.

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  • 17. 

    Scales for weighing aggregates and cement shall be accurate within ___

    • 0.1%

    • 0.25%

    • 0.5%

    • 1.9%

    Correct Answer
    A. 0.5%
    Explanation
    The answer is 0.5% because when weighing aggregates and cement, it is important to have accurate measurements to ensure the proper ratio and consistency of the mixture. A tolerance of 0.5% allows for a small margin of error while still maintaining the overall accuracy of the weighing process. This ensures that the final product meets the required specifications and quality standards.

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  • 18. 

    Scales for weighing aggregates and cement shall be accurate within ___ % throughout the range of use. Scales shall be inspected and sealed as often as the Engineer may deem necessary to assure their continued accuracy.

    • 1.0%

    • 1.5%

    • 0.5%

    • 2.0%

    Correct Answer
    A. 0.5%
    Explanation
    The correct answer is 0.5%. This means that the scales used for weighing aggregates and cement must be accurate within 0.5% throughout their entire range of use. It is important to regularly inspect and seal the scales to ensure that they maintain their accuracy.

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  • 19. 

    The wearing away of the pavement surface caused by the dislodging of aggregate particle is called ____

    • Alligator crack

    • Raveling

    • Rutting

    • Bleeding

    Correct Answer
    A. Raveling
    Explanation
    Raveling refers to the wearing away of the pavement surface caused by the dislodging of aggregate particles. This occurs when the bond between the aggregate particles and the asphalt binder weakens, leading to the loss of aggregate and the formation of loose debris on the pavement surface. Raveling can result from various factors such as aging, traffic loads, and environmental conditions, and if left untreated, it can lead to further deterioration of the pavement.

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  • 20. 

    If the strength control specimen does not meet the requirement and not feasible to obtain cores due to structural consideration, as a Material Engineer what will be your decision?

    • Removed and replaced

    • Area will not be paid

    • Payment will be made at an adjusted price

    • 50 % payment

    Correct Answer
    A. Payment will be made at an adjusted price
    Explanation
    If the strength control specimen does not meet the requirement and obtaining cores is not feasible due to structural considerations, the Material Engineer's decision would be to make payment at an adjusted price. This means that the payment for the area will be adjusted based on the strength deficiency of the specimen, rather than completely withholding payment or paying only a percentage of the original amount. This decision takes into account the limitations of obtaining cores and allows for a fair adjustment in payment based on the quality of the material.

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  • 21. 

    For small project where quantity of steel bars is 10,000 kg or less, what is the basis for acceptance of material?

    • No testing

    • PE certificate

    • Mill certificate

    • Yield certificate

    Correct Answer
    A. Mill certificate
    Explanation
    The basis for acceptance of material in a small project where the quantity of steel bars is 10,000 kg or less is the mill certificate. A mill certificate is a document provided by the manufacturer of the steel bars, which certifies that the material meets the required specifications and standards. It includes information such as the chemical composition, mechanical properties, and testing results of the steel bars. This certificate ensures that the material is of acceptable quality and can be used in the project without the need for additional testing.

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  • 22. 

    ___ is a process of breaking down of rocks into small pieces of various size that can range from large boulders to very small clay particles

    • Consolidation

    • Unconsolidation

    • Unweathering

    • Weathering

    Correct Answer
    A. Weathering
    Explanation
    Weathering is the correct answer because it refers to the process of breaking down rocks into smaller pieces of various sizes. This process can occur due to various factors such as temperature changes, water, wind, and biological activity. Weathering can result in the formation of different types of sediment, including large boulders, gravel, sand, and clay particles. It is an essential step in the formation of soil and plays a crucial role in shaping the Earth's surface over time.

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  • 23. 

    Too much asphalt content in the bituminous mixes causes ___

    • Cored

    • Cracks

    • Potholes

    • Bleeding

    Correct Answer
    A. Bleeding
    Explanation
    Excessive asphalt content in bituminous mixes can lead to bleeding. Bleeding occurs when the excess asphalt rises to the surface of the pavement, creating a shiny, sticky film. This can result in reduced skid resistance, making the road slippery and unsafe for vehicles. Additionally, the excess asphalt can attract dirt and debris, leading to poor aesthetics and reduced visibility of road markings. Overall, bleeding can negatively impact the performance and durability of the pavement.

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  • 24. 

    ___ is the moisture in an air-dried soil

    • Moisture content

    • Natural moisture content

    • Hygroscopic moisture content

    • Hydrometer moisture content

    Correct Answer
    A. Hygroscopic moisture content
    Explanation
    Hygroscopic moisture content refers to the moisture present in an air-dried soil. This moisture is absorbed from the surrounding air by the soil particles due to their hygroscopic nature. It represents the water content that is held tightly by the soil particles and is not easily available for plant uptake. The hygroscopic moisture content is important in determining the soil's ability to retain water and its overall moisture-holding capacity.

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  • 25. 

    The specific gravity of sodium sulfate used in soundness test for aggregates should be within in the range of ___ 

    • 1.151 to 1.174

    • 1.250 to 1.178

    • 1.051 to 1.154

    • 1.058 to 1.184

    Correct Answer
    A. 1.151 to 1.174
    Explanation
    The specific gravity of sodium sulfate used in the soundness test for aggregates should be within the range of 1.151 to 1.174. This range is important because it ensures that the sodium sulfate solution has the correct density to accurately measure the potential for volume changes in the aggregates. If the specific gravity is outside of this range, it could result in inaccurate test results and potentially lead to incorrect conclusions about the soundness of the aggregates.

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  • 26. 

    ___ indicates the composition of soil

    • Atterberg limit

    • Plasticity index

    • Liquidity index

    • Shrinkage limit

    Correct Answer
    A. Atterberg limit
    Explanation
    The Atterberg limit is a measure of the water content at which a soil transitions from a liquid to a plastic state, and from a plastic to a solid state. It consists of three tests: the liquid limit, the plastic limit, and the shrinkage limit. The Atterberg limit helps determine the consistency and behavior of a soil, which is important in various engineering applications such as foundation design and slope stability analysis. Therefore, the Atterberg limit is a key indicator of the composition and properties of soil.

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  • 27. 

    ___ is liquid asphalt which is a mixture of asphalt cement and gasoline

    • Medium curing cutback

    • Slow curing cutback

    • Rapid curing cutback

    • Low curing cutback

    Correct Answer
    A. Rapid curing cutback
    Explanation
    A rapid curing cutback is a type of liquid asphalt that is made by mixing asphalt cement with gasoline. This mixture allows the cutback to cure quickly, making it suitable for applications where a fast curing time is desired.

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  • 28. 

    When mixed at the site or in a central mixing plant, the mixing time shall not be less than ____ not more than _____ unless mixer performance test prove adequate mixing of concrete in shorter time period.

    • 30 seconds not more than 90 seconds

    • 50 seconds nor more than 90 seconds

    • 60 seconds nor more than 120 seconds

    • 90 seconds nor more than 120 seconds

    Correct Answer
    A. 50 seconds nor more than 90 seconds
    Explanation
    The correct answer is 50 seconds nor more than 90 seconds. This means that when mixing concrete at the site or in a central mixing plant, the mixing time should be at least 50 seconds but should not exceed 90 seconds. However, if mixer performance tests demonstrate that adequate mixing can be achieved in a shorter time period, then the mixing time can be adjusted accordingly.

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  • 29. 

    When concrete is delivered in truck mixers, additional water may be added to the batch and additional mixing performed to increase the slump to meet the specified requirement is permitted by the Engineer, provided all these operation are performed within ___ after the initial mixing operation and the water and cement ratio is not exceeded.

    • 30 minutes

    • 15 minutes

    • 45 minutes

    • 60 minutes

    Correct Answer
    A. 45 minutes
    Explanation
    When concrete is delivered in truck mixers, there may be instances where the slump of the concrete needs to be increased to meet the specified requirement. In such cases, the Engineer permits the addition of additional water to the batch and additional mixing to be performed. However, these operations must be completed within a certain timeframe after the initial mixing operation. The correct answer of 45 minutes indicates that the additional water and mixing can be done within this time limit, as long as the water and cement ratio is not exceeded.

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  • 30. 

    It indicates very poor subbase materials when GI is equal to ___

    • 0

    • 5

    • 10

    • 20

    Correct Answer
    A. 20
    Explanation
    When the GI (Group Index) is equal to 20, it indicates very poor subbase materials. The Group Index is a measure used in geotechnical engineering to assess the quality of subgrade soils. A higher GI value suggests a weaker and less stable subbase. Therefore, a GI of 20 signifies extremely poor subbase materials, indicating that the subgrade is highly susceptible to deformation and may require significant improvements or reinforcement.

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  • 31. 

    ___ determines the thickness and density of compacted asphalt pavement

    • Core test

    • FDT

    • X-ray

    • Grading test

    Correct Answer
    A. Core test
    Explanation
    The core test is used to determine the thickness and density of compacted asphalt pavement. This test involves extracting a cylindrical sample (core) from the pavement and analyzing it in a laboratory. By measuring the dimensions and weight of the core, the thickness and density of the pavement can be calculated. This information is crucial for assessing the quality and performance of the asphalt pavement, as well as for making necessary adjustments or repairs if needed.

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  • 32. 

    This is used in soil stabilized road surface due to iys high ____ property, that is, it absorb the retain water

    • Potassium chloride

    • Calcium chloride

    • Magnesium chloride

    • Sodium chloride

    Correct Answer
    A. Magnesium chloride
    Explanation
    Magnesium chloride is used in soil stabilized road surfaces due to its high absorbent property, meaning it has the ability to absorb and retain water. This property helps to prevent the soil from becoming too dry or too wet, which can lead to instability and damage to the road surface. Potassium chloride, calcium chloride, and sodium chloride do not possess the same absorbent property as magnesium chloride, making them less suitable for this purpose.

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  • 33. 

    Vibration shall operate a frequency of 8,300 to 9,600 impulse per minute under load at a maximum spacing of

    • 50 cm

    • 40 cm

    • 60 cm

    • 30 cm

    Correct Answer
    A. 60 cm
    Explanation
    The correct answer is 60 cm. This means that the maximum spacing between the vibrations should be 60 cm. Vibration is expected to operate at a frequency of 8,300 to 9,600 impulses per minute under load. This information suggests that the vibrations should be evenly spaced apart by a maximum distance of 60 cm.

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  • 34. 

    If no core had been taken at the end of each day of operation and the project has already been completed, a core shall be taken ___

    • For every 75 l.m./lane

    • For every 150 l.m./lane

    • For every 100 l.m./lane

    • For every 1000 l.m./lane

    Correct Answer
    A. For every 100 l.m./lane
    Explanation
    Based on the given information, if no core had been taken at the end of each day of operation and the project has already been completed, a core shall be taken for every 100 l.m./lane. This means that for every 100 linear meters per lane, a core sample should be taken.

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  • 35. 

    ___ is an empirical number used in evaluation for GI

    • 0-15

    • 5-20

    • 0-20

    • 5-15

    Correct Answer
    A. 0-20
    Explanation
    The given answer range of 0-20 is the correct one because it encompasses the entire range of possible values for the empirical number used in evaluation for GI. This means that any value within this range can be considered when evaluating GI.

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  • 36. 

    The ___ test determines the asphalt content in the bituminous mix

    • Grading

    • Bulk specific gravity

    • Extraction

    • Absorption

    Correct Answer
    A. Extraction
    Explanation
    The extraction test is used to determine the asphalt content in the bituminous mix. This test involves extracting the asphalt from the mix using a solvent, such as trichloroethylene or methylene chloride. The extracted asphalt is then weighed to determine its percentage in the mix. This information is important for quality control purposes, as it helps ensure that the correct amount of asphalt is present in the mix, which is crucial for its performance and durability.

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  • 37. 

    ___ is liquid asphalt which is a mixture of asphalt cement and kerosene

    • Medium curing cutback

    • Slow curing cutback

    • Rapid curing cutback

    • Low curing cutback

    Correct Answer
    A. Medium curing cutback
    Explanation
    A medium curing cutback is a type of liquid asphalt that is made by mixing asphalt cement with kerosene. This mixture has a moderate rate of curing, meaning it takes a moderate amount of time for the cutback to harden and set. This type of cutback is commonly used for various applications such as road construction and maintenance, as it provides a good balance between curing time and durability.

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  • 38. 

    In asphalting work, there are ___ phase of rolling

    • 2

    • 3

    • 1

    • 4

    Correct Answer
    A. 3
    Explanation
    In asphalting work, there are three phases of rolling. This means that during the process of laying asphalt, there are three distinct stages where rolling is done to compact the asphalt and ensure a smooth and durable surface. Rolling helps to remove air voids and achieve proper density, which is crucial for the longevity and performance of the asphalt pavement.

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  • 39. 

    The cored sample of asphalt pavement is measured at __

    • Three points

    • Approximately quarter points

    • Two points

    • One point

    Correct Answer
    A. Approximately quarter points
    Explanation
    The correct answer is "approximately quarter points." When measuring the cored sample of asphalt pavement, it is done at approximately quarter points. This means that the sample is measured at four equidistant points along its circumference, dividing it into quarters. This method helps ensure that the measurements are taken evenly across the sample, providing a representative analysis of its properties and characteristics.

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  • 40. 

    After concrete has been placed, it is advisable to maintain fully welted and in position for how many hours?

    • 14 hours

    • 24 hours

    • 72 hours

    • 15-18 hours

    Correct Answer
    A. 72 hours
    Explanation
    After concrete has been placed, it is advisable to maintain it fully wetted and in position for 72 hours. This is because during this time, the concrete undergoes a process called hydration, where it reacts chemically with water to harden and gain strength. Keeping the concrete wet during this period helps to prevent it from drying out too quickly, which can result in shrinkage cracks and reduced strength. Therefore, it is important to maintain the concrete's moisture content for the full 72-hour period to ensure proper curing and achieve the desired strength and durability.

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  • 41. 

    The length of shelby tube of an undisturbed sample is ___

    • 10" long

    • 18" long

    • 16" long

    • 20" long

    Correct Answer
    A. 18" long
    Explanation
    The length of the Shelby tube of an undisturbed sample is 18" long.

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  • 42. 

    In the absence of beam mold in site, cylinder mold is allowed by specification. What is the required strength?

    • 2,500 psi

    • 3,000 psi

    • 3,500 psi

    • 4,000 psi

    Correct Answer
    A. 3,500 psi
    Explanation
    The required strength in the absence of a beam mold on-site is 3,500 psi. This means that the concrete used in the construction should have a compressive strength of at least 3,500 pounds per square inch. This specification ensures that the concrete is strong enough to withstand the intended load and perform well in the structure.

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  • 43. 

    When the value of GI is negative, what will be the soil performance?

    • Poor subgrade

    • Very good subgrade

    • Good subgrade

    • None of the above

    Correct Answer
    A. Very good subgrade
    Explanation
    When the value of GI (Group Index) is negative, it indicates that the soil has very good properties. This means that the soil has a high bearing capacity, good drainage, and is generally stable. Therefore, the soil performance would be classified as "very good subgrade".

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  • 44. 

    The depth of the weakened joints must not be less than __ and a width of ___

    • 40 mm and 6 mm

    • 50 mm and 5mm

    • 40 mm and 5 mm

    • 50 mm and 6 mm

    Correct Answer
    A. 50 mm and 6 mm
    Explanation
    The correct answer is 50 mm and 6 mm. This means that the depth of the weakened joints should be at least 50 mm and the width should be 6 mm. This is important to ensure that the joints are strong enough and can withstand the required load or stress. A depth of 50 mm provides enough material for the joint to resist bending or breaking, while a width of 6 mm allows for sufficient bonding area between the joint components.

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  • 45. 

    Retarder can delay the setting time of concrete up to how many hours?

    • 1 hour

    • 2 hours

    • 4 hours

    • 8 hours

    Correct Answer
    A. 4 hours
    Explanation
    The retarder is a chemical additive used in concrete to slow down the setting time. It can delay the setting time of concrete for up to 4 hours. This is beneficial in situations where there is a need for extended workability or when the concrete needs to be transported over long distances. By extending the setting time, the retarder allows for better placement and finishing of the concrete, resulting in a higher quality end product.

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  • 46. 

    The flow of water shall be uniform and all water should be in the drum by the end of the first ____ seconds of the mixing period.

    • 45

    • 30

    • 15

    • 20

    Correct Answer
    A. 15
    Explanation
    The correct answer is 15. This means that all the water should be in the drum by the end of the first 15 seconds of the mixing period. This indicates that the flow of water should be consistent and evenly distributed throughout the mixing process. If all the water is not in the drum by this time, it may affect the quality and consistency of the mixture being produced.

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  • 47. 

    Prime coat shall be undisturbed for at least ___

    • 4 hours

    • 8 hours

    • 16 hours

    • 24 hours

    Correct Answer
    A. 24 hours
    Explanation
    The prime coat needs to be undisturbed for at least 24 hours to allow it to fully dry and cure. This time period ensures that the prime coat forms a strong bond with the surface and provides a stable base for the subsequent layers of coating or paint. If the prime coat is disturbed before it has fully cured, it may not adhere properly and could result in a compromised finish or reduced durability. Therefore, it is important to wait for the recommended 24 hours before proceeding with any further work or application on top of the prime coat.

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  • 48. 

    ___ is liquid asphalt which is a mixture of asphalt cement and oil

    • Medium curing cutback

    • Slow curing cutback

    • Rapid curing cutback

    • Low curing cutback

    Correct Answer
    A. Slow curing cutback
    Explanation
    A slow curing cutback is a type of liquid asphalt that is made by mixing asphalt cement and oil. It is called "slow curing" because it takes a longer time to cure or harden compared to other types of cutbacks. This type of cutback is often used for road construction and maintenance projects where a slower curing time is desired.

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  • 49. 

    What is the color of asphalt when it is overcook?

    • Yellowish brown

    • Black

    • Gray

    • Brown

    Correct Answer
    A. Yellowish brown
    Explanation
    When asphalt is overcooked, it tends to change color and become yellowish brown. This can happen due to excessive heat exposure or prolonged cooking time. The yellowish brown color indicates that the asphalt has been overheated and may have lost some of its original properties. It is important to monitor the cooking process carefully to avoid overcooking and maintain the desired color and quality of the asphalt.

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  • Aug 15, 2024
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  • Aug 30, 2016
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