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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 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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