ME EXAM 2022
The temperature at which bituminous material will evolve vapors that will temporarily ignite when a small flames is brought in contact with it
Ignition temperature
Flash point
Threshold point
Burning Temperature
The phenomenon wherein the soil subgrade losses strength due to ground shaking and the presence of fine grained cohesionless soil:
Settlement
Liquefaction
Subsidence
Hydraulic compaction
Which of the following practices is acceptable to use to bring down the temperature of the concrete mix?
Add crushed ice to the mix
Sprinkler water to the aggregates
Use chilled water for the mix
All of the above
For asphalt stabilized road mix base course, the amount of asphaltic materials to be added to the soil-aggregate shall be:
From 3 to 12 mass percent of the dry soil
From 6 to 10 mass percent of the dry soil
From 4 to 7 mass percent of the dry soil
None of the above
Unconfined compressive strength test is usually performed on:
Sandy soils
Silty soils
Organic soils
Clayey soils
The ratio of the weight in air of a unit volume of the impermeable portion of aggregate to the ....in air of an equal volume of gas-free distilled water at the stated temperature
Bulk specific gravity
Bulk ssd specific gravity
Apparent specific gravity
Optimum specific gravity
Which of the following tests is not conducted on asphalt cement?
Solubility
Viscosity
Flash point
Loss on heating
Considering the express provision indicated in DPWH standard specification for Item .... Embankment, which of the following is considered as an unsuitable material?
Soil with a plasticity index of 58
Soil with a natural density of 900 kg/m3
Soil with a liquid limit of 70
All of the above
Which of the following is the recommended cement content for stabilizing poorly graded sand?
2-4%
4-6%
6-8%
Stabilization using cement is not recommended
For item 106 - compaction equipment and density control strips, control strips shall have an area approximately ___ and shall be the same depth of the course/layer it represents
330 sq.m
335 sq.m.
340 sq.m.
345 sq.m.
After placement of concrete, how long shall pre-cast concrete members be subjected to pre-steaming when it will be subjected to steam curing?
Minimum of 1 hr
Minimum of 2 hrs
Minimum of 3 hrs
Minimum of 4 hrs
Which of the following shall be considered when selecting a filter material to meet the grading requirement for aggregate base course?
It shall contain more than 5 percent of material retained on No. 4 sieve
It shall contain more than 10 percent of material retained on No. 4 sieve
It shall contain more than 15 percent of material retained on No. 4 sieve
None of the above
A concrete pavement for a National Primary Road registered an International Rough Index (IRI) Value of 3.0m/km. As a Material Engineer, which of the following will you recommend?
Accept the material as if falls within the allowable tolerance
Accept the material at adjusted price
Undertake grinding of concrete pavement
Remove and replace the pavement
What are the different test required for soil classification?
Natural moisture content, gradation, and atterbergs limit
Gradation and atterbergs limit
Gradation and specific gravity
Gradation, specific gravity, and atterbergs limit
Plastic limit corresponds to the moisture content of the soil
At 15 shocks
At 25 shocks
At 30 shocks
None of the above
Which of the following tests is NOT conducted on emulsified asphalt?
Loss on heating
Viscosity
Distillation
Cement mixing
As prescribed under Item 606 - Pavement Markings, traffic paint shall be applied to the pavement at the rate of 0.33 K/m2 and shall dry sufficiently to be free from cracking in from
5 to 15 minutes
15 to 30 minutes
30 to 45 minutes
45 to 60 minutes
For Portland cement stabilized road mix base course, the amount of cement to be added to the soil-aggregate shall be:
From 3 to 12 mass percent of the dry soil
From 6 to 10 mass percent of the dry soil
From 4 to 7 mass percent of the dry soil
None of the above
When supervising a project, you noticed that the Contractor was not applying tack coat in between the asphalt layers. Which of the following will most likely occur?
Slippage cracking
Shoving
Raveling
Upheaval
Blended Hydraulic Cement shall conform to the requirements specified under:
ASTM C 150
ASTM C 595
ASTM C91
ASTM C 207
Samples of Type I cement when tested for quality passed the requirements except for Loss on Ignition. What will you recommend as a Materials Engineer?
Accept the material as loss on ignition is not a requirement for Type I cement
Accept the material at adjusted price
Reject the material
Reprocess the material by blending
Samples of Aggregates Base Course materials when tested for quality passed the requirements except for grading. What wil you recommend as a Materials Engineer?
Accept the material as grading is not required as per specification
Accept the material at adjusted price
Reject the material
Reprocess the material by blending
When supervising a project, you noticed that the Contractor was applying more tack coat than the required. Which of the following will most likely occur?
Bleeding
Raveling
Swelling
Pumping
Which of the following tests is NOT conducted on cut-back asphalt?
Distillation
Flash point
Storage stability
Ductility
Given the grading test result of the sand sample, determine the Fineness Modulus:
3.07
3.17
3.27
3.37
Laboratory report revealed that the asphalt cement used in the asphalt mix was more than what was required by the job mix. Which of the following will most likely occur?
Slippage cracking
Shoving
Ravelling
Upheaval
Considering only the group index (Gl) and other factors as equal, which of the following soil samples will you recommend for use as a subgrade material?
Soil with computed GI = 3
Soil with computed GI = 12
Soil with computed GI = 18
Soil with computed GI = -10
Which of the following materials is permitted to be used as bituminous prime coat?
Asphalt cement
Cationic rapid setting emulsified asphalt
Rapid curing cut-back asphalt
Both b and c
Most road signs are hard to read at night. What is the specification requirement in the reduction of brightness of the reflective sheeting during night time and when totally wet by rain?
Shall be less than 75% of the minimum specified reflective brightness value
Shall be less than 85% of the minimum specified reflective brightness value
Shall be less than 90% of the minimum specified reflective brightness value
Shall be less than 50% of the minimum specified reflective brightness value
A sample of fine aggregate was subjected to colorimetric test for inorganic impurities. Results revealed that the color produced by the sample was darker than the standard color guide. As a Material Engineer, how will you evaluate the material?
Accept the material
Reject the material
Subject the material to further testing
None of the above
During asphalt paving, the rolling shall be continued until_____ of the density of the laboratory compacted specimens has been obtained
95 mass percent
97 mass percent
99 mass percent
100 mass percent
All of the following are the test required for Waste Excavated Materials, EXCEPT:
California Bearing Ratio (CBR)
Plasticity Test
Organic Content
None of the above
Which of the following will be the result of proper compaction of an embankment material?
Increase compressibility
Increase soil permeability
Increase shear strength and soil stability
All of the above
Asphalt emulsion mixes are also known as
Hot mix asphalt
Warm mix asphalt
Cold mix asphalt
None of the above
Which of the following is the least likely cause of corrugations on asphalt pavement?
Excessive fines
Unstable base material
High air voids
Plastic mixture
In asphalt pavement, the variation of the surface between any two contacts with the surface using a 3-m straight edge shall not exceed:
5mm
6mm
10mm
13mm
What type of test is generally used to obtain the maximum dry unit weight and optimum moisture content
CBR test
Proctor test
Speedy moisture test
Field density test
Which of the following prescribes the minimum dry compressive strength of Stone Mastic Asphalt (SMA) mix?
1.4MPa
2.4MPa
3.6MPa
3.8MPa
Testing conducted on asphalt pavement cores showed a deficiency in density by 3%. What will you recommend as a Material Engineer?
Accept the material as it falls within the allowable tolerance
Accept the material at adjusted price
Reject the material as it falls beyond the allowable tolerance
None of the above
The test used to determine the amount of volatile constituents in cutback asphalt products
Extraction
Distillation
Centrifugation
Solubility
The hardened concrete pavement was tested and was found to have a coefficient of friction equal to 0.30. As a Material Engineer, how will you decide?
Accept the material as it falls within the allowable tolerance
Accept the material at adjusted price
Reject the material as it falls beyond the allowable tolerance
None of the above
As soon as the concrete has hardened sufficiently, the pavement surface was tested using a 3-m straight edge. Results revealed that the departure from the correct cross section was 13mm. As a Material Engineer, which of the following will you recommend?
Accept the material as it falls within the allowable tolerance
Accept the material at adjusted price
Overlay concrete to attain correct cross section
Remove and replace the pavement
A type of surface defect that is characterized by the wearing of aggregate on the pavement surface due to traffic, causing a much lower surface friction.
Scaling
Crazing
Polishing
Ravelling
Thickness of reflectorized thermoplastic rumble strips as prescribed under the specification:
3mm to 12mm
4mm to 13mm
5mm to 14mm
Depending on the location of the road
Which of the following prescribes the minimum index of retained strength of asphalt mixture when tested by AASHTO T 165?
70%
75%
80%
85%
When permitted as partial replacement of Portland cement, fly ash shall not exceed what percentage?
10%
15%
20%
25%
Which of the following statement is TRUE for Item 311 - Portland Cement Concrete Pavement?
Mixing of different brands of cement is allowed as long as they are the same type and the specific gravity falls within the allowable tolerance
Using different brands of cement is allowed provided it will be used alternately
Mixing of cement from different mills is allowed as long as they are produced by the same manufacturer
None of the above
A non-agitating truck arrived after 30 minutes from a batching plant hauling the fresh concrete mix that you have ordered. You immediately directed to conduct a slump test and observed that the sample failed to meet the slump as specified in the requirement. As a Material Engineer, what will be your recommendation?
Add enough water to meet the slump without exceeding the water-cement ratio
Accept the material at an adjusted price
Reject the batch
None of the above
Three (3) core samples taken from the concrete pavement section pour on a single day were tested for compressive strength as shown below.
- 3200psi
- 3150psi
- 2650psi
If the required strength is 3500 psi, which of the following will you recommend?
Accept the material as it falls within the allowable tolerance
Accept the material at adjusted price
Remove and replace the pavement
None of the above
Atterberg's limit tests are conducted to determine whether the material passing No. 200 sieve has ..... Characteristics of a clay or a silt. It is also used to determine the plasticity index. Considering these ..... Which of the following statement is TRUE?
Higher plasticity index indicates higher degree of compressibility and higher permeability
Higher plasticity index indicates lower degree of compressibility and lower permeability
Higher plasticity index indicates higher degree of compressibility and lower permeability
Higher plasticity index indicates lower degree of compressibility and higher permeability
The asphalt pavement represented by the individual core shall not be accepted if the deficiency core thickness as obtained exceeded:
5mm
6mm
10mm
13mm
What is the Minimum Testing Requirement for embankment materials?
One (1) for every 500 m3 per source or fraction thereof
One (1) for every 1000m° per source or fraction thereof
One (1) for every 2000m° per source or fraction thereof
One (1) for every 3000m° per source or fraction thereof
Which of the following will you recommend as repair method for alligator cracking of asphalt pavement?
Full-depth patch
Removing of cracked pavement layer and replacing with an overlay
Crack sealing to prevent further entry of moisture into the subgrade
All are applicable depending on the severity
Which of the following describes the effect of fly ash in Portland cement concrete pavement?
Improves early strength
Increase workability
Increase heat of hydration
All of the above
The proper way of rolling for asphalt pavement should begin:
At the sides and proceeds longitudinally parallel toward the road centreline
At the sides and proceeds longitudinally parallel toward the road centreline
At the side and ending in the longitudinal joint
All of the above are acceptable depending on the case
Which of the following is NOT included In the recommended method of curing Portland cement concrete pavement?
By covering the concrete with saturated straw or hay
By thoroughly wetting the pavement and covering it with waterproof paper
By spraying plasticizer compound on top of the pavement after the concrete has been broom to finish
By spraying uniformly with white pigment curing compound immediately after finishing of the surface
For acceptance purposes, core samples shall be taken from the completed asphalt pavement
For every 75 linear meter per lane
For every 100 linear meter per lane
For every 150 linear meter per lane
For every 200 linear meter per lane
Laboratory apparatus used to determine the specific gravity of cement
Pycnometer
Hydrometer
Le Chatelier flask
Vicat apparatus
As prescribed under Department Order No. 37, series of 2016, Pile Integrity Test shall be conducted on
At least 50% of the total number of bored piles
At least 40% of the total number of bored piles
At least 30% of the total number of bored piles
At least 20% of the total number of bored piles
When concrete will be deposited in water, its minimum cement content shall be:
280 kg/m3
380 kg/m3
480 kg/m3
580 kg/m3
What class of concrete shall be used for Item 507-Rubble Concrete?
Class A
Class B
Class C
Class P
The newly paved SMA section shall be closed to vehicular traffic until such time that it cools down to what temperature?
30 to 40 degrees celsius
40 to 50 degrees celsius
50 to 60 degrees celsius
60 to 70 degrees celsius
For Portland Cement Concrete Pavement, the concrete shall not be left exposed for more than ____ between stages of curing or during the curing period
15 mins
30 mins
45 mins
60 mins
In concrete pouring for columns, what should be the maximum drop height to prevent segregation?
1.0m
1.5m
2.0m
2.5m
When compacting concrete, the vibrator shall not be operated longer than ___ in any one location
10sec
15sec
20sec
30sec
This is characterized by the ejection of water and subgrade material through the joints or cracks in a pavement.
Bleeding
Upheaval
Pumping
Blow-ups
Three (3) concrete cylinder samples were tested for compressive strength as shown below
- 3870psi
- 3680psi
- 2960psi
If the required strength is 3500 psi, which of the following will you recommend?
Accept the material as it falls within the allowable tolerance
Accept the material at adjusted price
Reject the material
None of the above
All shotcrete shall be cured uninterrupted for at least how long?
3 days
7 days
14 days
28 days
Insufficient compaction or vibration during placing of concrete may cause what type of defect?
Spalling
Segregation
Bleeding
Honeycomb
Which of the following water-cement ratios will produce the highest compressive strength?
0.40
0.45
0.50
0.55
For item 311, the depth of the weakened plane joint should at all times be:
Not more than 50mm
Not less than 50mm
Not more than 25mm
Not less than 25mm
Flexural strength of concrete beams shall not be less than ____ when tested by third-point method in accordance with AASHTO T 97
2.5MPa
3.8MPa
4.5MPa
5.2MPa
In determining the compressive strength, the maximum permissible range between specimens from the same mortar batch at the same test age shall be:
2.1%
7.6%
8.7%
9.8%
What is the significance of Loss on Ignition on cement?
It is the measure of the heat generated when cement is mixed with water
It signifies pre-hydration or moisture uptake of cement while it Is shelved
It is a measure of the resistance of the cement when exposed to fire
All of the above
During curing, covering materials for concrete pavement shall be maintained at a minimum of:
24hrs
48hrs
72hrs
7days
What is the minimum tensile strength requirement for carbon fiber sheet prescribed under Department Order No. 88, series of 2019?
1500 N/mm2
2400 N/mm2
3400 N/mm2
None of the above
Stones for riprap ranging from minimum of 30kg to a maximum of 70kg with at least 50 percent .... The stones weighing more than 50kg shall fall under what class?
Class A
Class B
Class C
Class D
The property or ability of asphalt concrete to withstand traffic loads without distortion or deformation especially at higher temperatures.
Stability
Soundness
Durability
Toughness
The significant elements to be checked in the water quality tests are?
Magnesium and silicates
Chloride and sulfates
Iron and aluminates
Sodium and calcium
The Index of Refraction of the beads used for pavement markings shall be within the range ...when tested by the liquid immersion method at 29degrees celsius
1.20 to 1.30
1.30 to 1.40
1.40 to 1.50
1.50 to 1.60
Which of the following equipment is used for testing paints?
Wheel and ramp
Ring and ball
Tag open cup
Rolling thin film oven
The following shall be included in the submission of job mix formula, EXCEPT:
Kind of bituminous material to be added
Percentage of aggregate passing each specified sieve sized
Temperature of the mixture to be delivered on the road
All items should be included
Additional testing may be required before the use of a curing compound if it has not... After the date of manufacture
60 days
90 days
120 days
6 months
The maximum number of layers for stacking cement bags which will be stored for more than 60 days
7 layers
10 layers
14 layers
20 layers
At the end of days work, the Contractor noticed a considerable amount of thermoplastic materials remaining in the heater. To save resources, the Contractor requested to re-use the material for a different section of the road pavement. As a Material Engineer, how will you decide?
Disallow as the materials has already been heated
Allow as long as the maximum heating temperature was not exceeded
Allow but subject to price adjustment
None of the above
In lieu of rejection of an entire piece of member containing welding which is unsatisfactory or indicates inferior workmanship, the following measure may be permitted, EXCEPT:
Removal of part of the weld by gas-gouging
Caulking of welds
Cleaning and depositing additional weld metal
Using a smaller electrode than the original weld
As specified in Item 500, joint mortar for pipe culverts shall be used within ___ after its preparation
30mins
60mins
90mins
120mins
What type of asphalt sealant shall be used for the joints (Transverse Contraction/Weakened Plane, Construction and Longitudinal Joints) as per Department Order No. 91, series of 2016?
Hot Poured joint filler
Blown asphalt
Oxidation asphalt
All of the above
Which of the following is the frequency of sampling of concrete beams as required by DPWH specification?
At least one (1) of three (3) concrete beams every 50 cum. Or fraction thereof
At least one (1) of three (3) concrete beams every 500 cu.m. Or fraction thereof
At least one (1) of three (3) concrete beams every 750 cu.m. Or fraction thereof
At least one (1) of three (3) concrete beams every 75 cu.m. Or fraction thereof
What is the minimum compressive strength requirement for shotcrete?
1.4MPa
2.4MPa
3.6MPa
5.2MPa
What should be the minimum compressive strength of lean concrete?
3.8MPa
13.8MPa
18.3MPa
23.8MPa
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