Materials 4
Questions and Answers
- 1.
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.
- A.
1.0%
- B.
1.5%
- C.
0.5%
- D.
2.0%
Correct Answer
C. 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.Rate this question:
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- 2.
When cement is placed in contact with the aggregate, batches may be rejected unless mixed within ___ hours of such contact.
- A.
1.5 hours
- B.
2.0 hours
- C.
0.5 hours
- D.
2.5 hours
Correct Answer
A. 1.5 hoursExplanation
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.Rate this question:
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- 3.
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.
- A.
30 seconds not more than 90 seconds
- B.
50 seconds nor more than 90 seconds
- C.
60 seconds nor more than 120 seconds
- D.
90 seconds nor more than 120 seconds
Correct Answer
B. 50 seconds nor more than 90 secondsExplanation
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.Rate this question:
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- 4.
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.
- A.
45
- B.
30
- C.
15
- D.
20
Correct Answer
C. 15Explanation
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.Rate this question:
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- 5.
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.
- A.
30 minutes
- B.
15 minutes
- C.
45 minutes
- D.
60 minutes
Correct Answer
C. 45 minutesExplanation
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.Rate this question:
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- 6.
Concrete not place within ___ minutes from the time the ingredients were charged into the mixing drum shall be used
- A.
120 minutes
- B.
150 minutes
- C.
60 minutes
- D.
90 minutes
Correct Answer
D. 90 minutesExplanation
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.Rate this question:
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- 7.
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?
- A.
5.2%
- B.
5.0%
- C.
5.4%
- D.
4.8%
Correct Answer
B. 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%.Rate this question:
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- 8.
The minimum penetration of the preservative with the surface of the timber piles shall be
- A.
150 mm
- B.
200 mm
- C.
250 mm
- D.
100 mm
Correct Answer
B. 200 mmExplanation
The correct answer is 200 mm. This means that the minimum penetration of the preservative into the surface of the timber piles should be 200 mm. This depth ensures that the preservative effectively protects the timber from decay and insect damage. A deeper penetration provides better long-term protection for the timber piles, making them more durable and extending their lifespan.Rate this question:
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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
- A.
Two weeks
- B.
Three weeks
- C.
One week
- D.
Four weeks
Correct Answer
B. Three weeksExplanation
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.Rate this question:
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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.
- A.
18 deg C to 24 deg C
- B.
15 deg C to 18 deg C
- C.
14 deg C to 24 deg C
- D.
18 deg C to 28 deg C
Correct Answer
A. 18 deg C to 24 deg CExplanation
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.Rate this question:
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- 11.
This is used in soil stabilized road surface due to iys high ____ property, that is, it absorb the retain water
- A.
Potassium chloride
- B.
Calcium chloride
- C.
Magnesium chloride
- D.
Sodium chloride
Correct Answer
C. Magnesium chlorideExplanation
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.Rate this question:
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- 12.
The mass west of soil aggregate used in cement/lime proportions should not be more than ___.
- A.
40%
- B.
50%
- C.
45%
- D.
55%
Correct Answer
B. 50%Explanation
The correct answer is 50%. When using cement/lime proportions in soil aggregates, the mass of the west soil aggregate should not exceed 50%. This is because exceeding this limit can negatively affect the strength and stability of the mixture. It is important to maintain the right balance of cement/lime and soil aggregate to ensure the desired properties and performance of the final product.Rate this question:
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- 13.
The uniform rate at which the movable head of the CBR machine travel is
- A.
0.05 in/min
- B.
0.10 in/min
- C.
0.08 in/min
- D.
0.09 in/min
Correct Answer
B. 0.10 in/minExplanation
The correct answer is 0.10 in/min. This means that the movable head of the CBR machine travels at a uniform rate of 0.10 inches per minute.Rate this question:
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- 14.
Castin place concrete shall not bepost - tensioned until at least ____ and until the compressive strenght has reached the strength specified
- A.
7 days
- B.
10 days
- C.
14 days
- D.
20 days
Correct Answer
B. 10 daysExplanation
According to the given statement, post-tensioning of cast-in-place concrete should not be done until at least 10 days have passed since the concrete was placed. This is because it takes time for the concrete to gain sufficient compressive strength, which is necessary before applying post-tensioning forces. Waiting for 10 days ensures that the concrete has reached the specified strength, making it safe to proceed with post-tensioning.Rate this question:
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- 15.
The penetration test is an indication of the ___ of asphalt
- A.
Consistency
- B.
Softness
- C.
Hardness
- D.
Flash point
Correct Answer
A. ConsistencyExplanation
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.Rate this question:
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- 16.
Specifications requires one quality test for every ___ of asphalt
- A.
20 tons
- B.
200 tons
- C.
50 tons
- D.
40 tons
Correct Answer
B. 200 tonsExplanation
The given answer, "200 tons," is correct because the specifications require one quality test for every 200 tons of asphalt. This means that for every 200 tons of asphalt produced, a quality test needs to be conducted to ensure that the asphalt meets the required standards.Rate this question:
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- 17.
The ___ is the most commonly used method in the design and evaluation of bituminous concrete mixes
- A.
Job mix formula
- B.
Design mix
- C.
Marshall stability
- D.
Extraction
Correct Answer
C. Marshall stabilityExplanation
Marshall stability is the most commonly used method in the design and evaluation of bituminous concrete mixes. This method involves subjecting a compacted cylindrical specimen of the mix to a gradually increasing load until failure occurs. The load at failure, known as the Marshall stability, is a measure of the mix's resistance to deformation and cracking. By determining the Marshall stability, engineers can assess the performance and durability of bituminous concrete mixes, making it an essential tool in their design and evaluation process.Rate this question:
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- 18.
Vibration shall operate a frequency of 8,300 to 9,600 impulse per minute under load at a maximum spacing of
- A.
50 cm
- B.
40 cm
- C.
60 cm
- D.
30 cm
Correct Answer
C. 60 cmExplanation
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.Rate this question:
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- 19.
The specific gravity of sodium sulfate used in soundness test for aggregates should be within in the range of ___
- A.
1.151 to 1.174
- B.
1.250 to 1.178
- C.
1.051 to 1.154
- D.
1.058 to 1.184
Correct Answer
A. 1.151 to 1.174Explanation
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.Rate this question:
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- 20.
The specific gravity of magnesium sulfate solution used in soundness test for aggregate should be within the range of ___
- A.
1.280 to 1.408
- B.
1.180 to 1.308
- C.
1.295 to 1.308
- D.
1.195 to 1.318
Correct Answer
C. 1.295 to 1.308Explanation
The specific gravity of magnesium sulfate solution used in the soundness test for aggregate should be within the range of 1.295 to 1.308. This specific gravity range is necessary to ensure accurate and reliable results in the soundness test. A specific gravity outside of this range may indicate an issue with the solution's concentration, which could affect the test's ability to determine the aggregate's resistance to weathering and durability.Rate this question:
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- 21.
Aggregates accounts for 92-95% of the weight of the bituminous mixture asphalt accounts for 5-8% of the weight of the mix. The exact percentage to be used is determined by the ___
- A.
Trial mix
- B.
Design mix
- C.
Job mix
- D.
Job order
Correct Answer
A. Trial mixExplanation
The correct answer is trial mix. The percentage of asphalt to be used in the bituminous mixture is determined through a trial mix. This involves testing different proportions of aggregates and asphalt to find the optimal mix that meets the desired specifications. The trial mix helps in determining the right percentage of asphalt that will provide the desired strength, durability, and other performance characteristics for the specific project.Rate this question:
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- 22.
___ is an indication that the asphalt mix is overheated
- A.
Blue smoke
- B.
Stiff appearance
- C.
Rising steam
- D.
Mix slumps in truck
Correct Answer
A. Blue smokeExplanation
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.Rate this question:
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- 23.
In checking the temperature of the mix, the thermometer should be inserted into the mix at least ___
- A.
2"
- B.
6"
- C.
4"
- D.
6 mm
Correct Answer
B. 6"Explanation
The correct answer is 6". When checking the temperature of the mix, it is important to ensure that the thermometer is inserted deep enough into the mix to get an accurate reading. By inserting the thermometer at least 6 inches into the mix, it ensures that the thermometer is submerged in the mix and not affected by the surrounding air temperature. This will provide a more accurate measurement of the mix's temperature.Rate this question:
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- 24.
The solution used in the soundness test of aggregate shall be cooled to a temperature of 21 + or - 1 deg C maintain at that temperature for at least ___
- A.
24 hours
- B.
36 hours
- C.
48 hours
- D.
18 hours
Correct Answer
D. 18 hoursExplanation
The correct answer is 18 hours. In the soundness test of aggregate, the solution used needs to be cooled to a temperature of 21 + or - 1 deg C and maintained at that temperature for at least 18 hours. This is done to ensure that the aggregate is able to withstand volume changes caused by the reaction between the alkalies in the cement and certain constituents in the aggregate. By cooling the solution and maintaining it at a specific temperature for a certain duration, any potential expansion or cracking of the aggregate can be observed, indicating its soundness.Rate this question:
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- 25.
Proper compaction of the fill materials is very important, as it will ___
- A.
Increase the shear strength
- B.
Decrease permeability
- C.
Minimize compressibility
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
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.Rate this question:
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- 26.
In which DPWH item is emulsified asphalt not suitable?
- A.
Item 301
- B.
Item 302
- C.
Item 304
- D.
Item 308
Correct Answer
A. Item 301Explanation
Emulsified asphalt is not suitable for item 301 because item 301 refers to the construction of subbase course, which requires the use of aggregate materials. Emulsified asphalt is typically used for surface treatments and pavement preservation, not for subbase construction.Rate this question:
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- 27.
Unconfined compressive strength test is usually performed on ___
- A.
Sandy soils
- B.
Silty soils
- C.
Organic soils
- D.
Clayey soils
Correct Answer
A. Sandy soilsExplanation
The unconfined compressive strength test is usually performed on sandy soils because these soils have a higher proportion of sand particles, which provide better drainage and stability. Sandy soils have larger particles with less cohesion, making them more susceptible to compression. By conducting this test, engineers can determine the maximum stress that the soil can withstand without failure, which is important for designing structures and foundations on sandy soil.Rate this question:
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- 28.
Consolidation test is usually performed on ___ samples
- A.
Disturbed
- B.
Undisturbed
- C.
Consolidated
- D.
Both a and b
Correct Answer
B. UndisturbedExplanation
The consolidation test is usually performed on undisturbed samples. This is because undisturbed samples represent the natural state of the soil, without any disturbance or alteration to its structure. By testing undisturbed samples, the true behavior and properties of the soil can be accurately determined, allowing for more reliable analysis and predictions of its consolidation characteristics. Disturbed samples, on the other hand, have been altered or disturbed during sampling, which may affect their behavior and not provide an accurate representation of the soil's actual properties. Therefore, undisturbed samples are preferred for consolidation testing.Rate this question:
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- 29.
The cohesion and internal friction of soil is tested by
- A.
Tri axial shear test
- B.
Direct shear test
- C.
Bearing test
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
The cohesion and internal friction of soil can be tested using various methods such as the tri axial shear test, direct shear test, and bearing test. These tests help determine the soil's ability to withstand shear forces and provide information about its strength and stability. By conducting all of these tests, a comprehensive understanding of the soil's properties can be obtained, allowing engineers and geotechnical experts to make informed decisions regarding construction projects and soil stabilization techniques.Rate this question:
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- 30.
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?
- A.
Removed and replaced
- B.
Area will not be paid
- C.
Payment will be made at an adjusted price
- D.
50 % payment
Correct Answer
C. Payment will be made at an adjusted priceExplanation
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.Rate this question:
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- 31.
After concrete has been placed, it is advisable to maintain fully welted and in position for how many hours?
- A.
14 hours
- B.
24 hours
- C.
72 hours
- D.
15-18 hours
Correct Answer
C. 72 hoursExplanation
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.Rate this question:
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- 32.
Rock shall be excavated to a depth ___ below subgrade within the limit of the roadbed
- A.
100 mm
- B.
150 mm
- C.
200 mm
- D.
50 mm
Correct Answer
B. 150 mmExplanation
The correct answer is 150 mm. This means that when excavating the rock, it should be removed to a depth of 150 mm below the subgrade within the limit of the roadbed. This depth is necessary to ensure proper stability and support for the roadbed, allowing for adequate compaction and preventing any potential issues with the underlying rock layer.Rate this question:
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- 33.
Minimum penetration of all piles shall be ___
- A.
3 meter
- B.
6 meter
- C.
7 meter
- D.
4.5 meter
Correct Answer
A. 3 meterExplanation
The minimum penetration of all piles shall be 3 meters. This means that the piles must be driven into the ground to a depth of at least 3 meters. This requirement ensures that the piles are securely anchored in the soil and can support the load placed on them. A deeper penetration may be required for certain soil conditions or to meet specific engineering requirements, but a minimum of 3 meters is necessary to ensure the stability and strength of the piles.Rate this question:
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- 34.
Minimum thickness of bedding materials beneath the pipe is ___
- A.
100 mm
- B.
150 mm
- C.
200 mm
- D.
50 mm
Correct Answer
A. 100 mmExplanation
The minimum thickness of bedding materials beneath the pipe is 100 mm. This is the correct answer because a minimum thickness of 100 mm is necessary to provide adequate support and stability for the pipe. A thicker bedding material would offer even more support, but 100 mm is the minimum requirement. A thinner bedding material, such as 50 mm, would not provide enough support and could lead to instability and potential damage to the pipe.Rate this question:
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- 35.
Tolerance of gabion dimension is ___
- A.
+-1%
- B.
+-2%
- C.
+-3%
- D.
+-4%
Correct Answer
C. +-3%Explanation
The tolerance of gabion dimension is +-3% means that the actual dimensions of the gabion can vary by up to 3% from the specified dimensions. This allows for a slight variation in size to accommodate any discrepancies in the manufacturing process or installation. A tolerance of +-3% ensures that the gabion will still be suitable for its intended purpose even if it is slightly larger or smaller than the specified dimensions.Rate this question:
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- 36.
Minimum sized of galvanized wire mesh is ___
- A.
2.0 mm
- B.
2.2 mm
- C.
2.7 mm
- D.
3.4 mm
Correct Answer
B. 2.2 mmExplanation
The minimum size of galvanized wire mesh is 2.2 mm. This means that the diameter of the wire used to create the mesh should be at least 2.2 mm. Galvanized wire mesh is commonly used in various applications such as fencing, construction, and agriculture. The galvanization process involves coating the wire with a protective layer of zinc to enhance its durability and resistance to corrosion. A minimum size of 2.2 mm ensures that the mesh is strong enough to withstand the intended use and provides adequate protection or containment.Rate this question:
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- 37.
Minimum density of gabion is ___
- A.
1000 kg/cu.m
- B.
1200 kg/cu.m
- C.
1400 kg/cu.m
- D.
1500 kg/cu.m
Correct Answer
C. 1400 kg/cu.mExplanation
The minimum density of gabion is 1400 kg/cu.m. This means that the gabion must have a minimum mass of 1400 kilograms per cubic meter of volume. This density is important for ensuring the stability and strength of the gabion structure, as a higher density will provide better resistance against external forces and prevent deformation or collapse.Rate this question:
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- 38.
Soundness loss of filed gabion is ___
- A.
9% after 5 cycles
- B.
10% after 5 cycles
- C.
11% after 5 cycles
- D.
12% after 5 cycles
Correct Answer
A. 9% after 5 cyclesExplanation
The soundness loss of filed gabion is 9% after 5 cycles. This means that after undergoing 5 cycles, the gabion has experienced a loss in its soundness or stability of 9%. This could be due to various factors such as wear and tear, environmental conditions, or structural weaknesses. It is important to monitor and assess the soundness loss of gabions to ensure their effectiveness in retaining soil or controlling erosion.Rate this question:
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- 39.
The depth of the weakened joints must not be less than __ and a width of ___
- A.
40 mm and 6 mm
- B.
50 mm and 5mm
- C.
40 mm and 5 mm
- D.
50 mm and 6 mm
Correct Answer
D. 50 mm and 6 mmExplanation
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.Rate this question:
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- 40.
In soil, all boring shall be carried to a depth of at least ___ below the proposed gradeline
- A.
0.50 m
- B.
1.0 m
- C.
1.5 m
- D.
1.8 m
Correct Answer
B. 1.0 mExplanation
The correct answer is 1.0 m. When boring in soil, it is necessary to dig to a depth of at least 1.0 m below the proposed gradeline. This depth ensures that the foundation or structure being built will have sufficient stability and support from the soil. Going deeper than 1.0 m may be necessary in certain cases depending on the specific soil conditions and requirements of the project.Rate this question:
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- 41.
The test that determined pile bearing capacity by loading one or more pile and measuring settlement under load is ___
- A.
Vane shear test
- B.
Plate bearing test
- C.
Pile load test
- D.
Gradation test
Correct Answer
C. Pile load testExplanation
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.Rate this question:
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- 42.
The weight of disturbed samples from hard auger or split spoon shall be at least ___
- A.
1 kg
- B.
20 kg
- C.
10 kg
- D.
100 kg
Correct Answer
A. 1 kgExplanation
The weight of disturbed samples from hard auger or split spoon should be at least 1 kg. This ensures that an adequate amount of material is collected for testing and analysis. A sample weight of 1 kg allows for accurate determination of properties such as moisture content, density, and particle size distribution. It also ensures that there is enough material available for any additional tests that may be required.Rate this question:
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- 43.
Submission of sample for testing for cement is ___
- A.
10 kg
- B.
20 kg
- C.
15 kg
- D.
40 kg
Correct Answer
A. 10 kgExplanation
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.Rate this question:
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- 44.
The length of shelby tube of an undisturbed sample is ___
- A.
10" long
- B.
18" long
- C.
16" long
- D.
20" long
Correct Answer
B. 18" longExplanation
The length of the Shelby tube of an undisturbed sample is 18" long.Rate this question:
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- 45.
For small project where quantity of steel bars is 10,000 kg or less, what is the basis for acceptance of material?
- A.
No testing
- B.
PE certificate
- C.
Mill certificate
- D.
Yield certificate
Correct Answer
C. Mill certificateExplanation
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.Rate this question:
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- 46.
___ determine the best combination of the material that will produce a potentially stable and durable mixture
- A.
Job mix formula
- B.
Marshall formula
- C.
Design of bituminous mix
- D.
Compaction test
Correct Answer
A. Job mix formulaExplanation
The job mix formula is used to determine the best combination of materials for producing a potentially stable and durable mixture. It considers factors such as the type and gradation of aggregates, the type and amount of asphalt binder, and other additives. By using the job mix formula, engineers can optimize the proportions of materials to achieve the desired performance characteristics of the bituminous mix, such as strength, stability, and resistance to cracking and rutting.Rate this question:
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- 47.
___ is the rate of loading for concrete cylinder sample subject to compression test
- A.
20-40 psi/sec
- B.
20-50 psi/sec
- C.
15-40 psi/sec
- D.
15-50 psi/sec
Correct Answer
B. 20-50 psi/secExplanation
The rate of loading for a concrete cylinder sample subject to a compression test is typically measured in psi/sec. The correct answer in this case is 20-50 psi/sec, which means that the load is applied to the cylinder at a rate between 20 and 50 pounds per square inch per second. This loading rate is important because it affects the strength and behavior of the concrete sample during the test. A higher loading rate can result in higher strength values, while a lower loading rate can lead to lower strength values.Rate this question:
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- 48.
What is the wash loss of fine aggregates in the no. 200 sieve?
- A.
1%
- B.
2%
- C.
3%
- D.
4%
Correct Answer
C. 3%Explanation
The wash loss of fine aggregates in the No. 200 sieve is 3%. This means that when the fine aggregates are washed through the No. 200 sieve, 3% of the material will be lost. This loss can occur due to the smaller particles passing through the sieve openings or getting washed away during the process. It is important to determine the wash loss as it affects the overall quality and gradation of the fine aggregates used in construction.Rate this question:
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- 49.
Retarder can delay the setting time of concrete up to how many hours?
- A.
1 hour
- B.
2 hours
- C.
4 hours
- D.
8 hours
Correct Answer
C. 4 hoursExplanation
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.Rate this question:
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- 50.
Super plasticizer can increase the strength of concrete up to how many percent?
- A.
40-60%
- B.
50-60%
- C.
50-70%
- D.
60-70%
Correct Answer
C. 50-70%Explanation
Super plasticizer is a type of admixture used in concrete to improve its workability and reduce water content. It allows for a higher water-to-cement ratio, resulting in increased strength of the concrete. The correct answer, 50-70%, suggests that the use of super plasticizer can enhance the strength of concrete by up to 50-70% compared to regular concrete without the admixture.Rate this question:
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Current Version
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Aug 15, 2024Quiz Edited by
ProProfs Editorial Team -
Aug 30, 2016Quiz Created by
Matthewsdizon
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