YT2 Materials Engineer EXAM

通報

問題一覧

The fine grained soils in the field can be identified through the use of simple visual and manual test except ______?

Dry weight

The most basic criterion that can be applied for rejection for asphalt mixtured delivered to the site is:

Temperature of mixture

This is driven in order to determine the casting length of the piles.

Test pile

Stone Mastic Asphalt shall be placed at a temperature not less than:

135°C

What is the plasticity index of soil having a liquid limit of 40 and plastic limit of 10?

In subbase construction a trial section of about ______ sq.m. shall be made for every type of material/equipment/procedure proposed for use.

500

What is the allowable mass percent air voids of bituminous mixture for Item 310?

3 to 5 percent

This is a test criterion for reinforced concrete pipe tested in a three edge bearing test.

0.3mm crack

What should be done on the subbase course with existing moisture content of 10% higher than the optimum moisture of the AASHTO T180 Method D?

Dry out to reduce moisture, spread to the required loose thickness and compact

The proper and accurate measurement of all the materials used in the production of concrete to ensure uniformity of proportions and aggregate grading is called:

Batching

What is the purpose of test pile?

To determine the required length and number of piles needed

The smaller the value of the fineness modulus the:

Finer the material

Which of the following is not required in the preparation of cement treated base

Stability test

Materials suitable for embankment (Selected Borrow - for toppings) shall have a plasticity index of not more than:

Embankment materials are classified as unsuitable materials if:

the plasticity index is 60

Which of the following are the qualitative requirements for the reflectorized thermoplastic pavement markings under the DPWH Standard Specifications?

All of these

During testing of concrete cylinders in unaxial compression, what will happen to the result of the test if the rate of loading is rapid (i.e. way above the prescribed rate of loading)?

The computed compressive strength will be higher

If the pipes are fabricated in projects located in remote areas and it is impractical to send samples to DPWH testing laboratory ar any private testing laboratory for testing, what would you do if you are the Materials Engineer?

Submit a field inspection report and test results on concrete cylinder samples

Core test for concrete pavement thickness determination showed that three out of nine (3/9) samples taken failed to meet the thickness requirement. The deficiency in the average thickness of cores is more than 25mm. What will you do as Materials Engineer.

Remove and replace the area represented by the failed core samples

The sand used in the field density test in determining the volume of hole using sand cone method must be clean, dry and passing sieve number:

In performing a grading test on a course aggregate for Item 311, the mass percent passing the materials for 3" and 2 1/2" is 100%. What is the maximum size of aggregates?

2 1/2"

Unconfined compressive strength test is usually performed on:

Clayey soils

What is the compressive strength of concrete cylinder sample (6") that fails at 92500lbs?

3270psi

The minimum cement content per cubic meter of Seal Class of concrete in Structural Concrete is:

380kg (9.5bags)

Compute the Fineness Modulus of Sand with Sieve Analysis data as follows:

3.24

In structural concrete, the maximum size of aggregate shall be:

2/3 of the spacing of the rebars

Sample for CBR test is soaked for _____ hours before subjecting it to penetration test.

The required strength of the concrete beam sample is at least ______ when tested by midpoint method

650psi

The maximum height of reflectorized thermoplastic rumble strips.

13mm

The asphalt pavement represented by core shall not be accepted if the deficiency in density is more than:

The upper limit of grain sizes used for determining Atterberg limits of soil is:

#40 sieve

In the given data LL = 36 and PL = 6. What is the Plasticity Index?

In Item 514 Shotcrete, what is the maximum layer thickness shotcrete application allowed per layer?

50mm

This permeable fabric which, in association with soil or embankment to separate, reinforce, and serves as filler.

Geotextiles

In concrete mixtures, which of the following is the dividing line between coarse and fine aggregates?

#4 (4.75mm)

Three cores taken from a pavement section poured on a single day were tested to have strength as follows: If the required strength is 3500psi concrete and represented by this cores, as ME, what is your judgment?

Considered inadequate

Slump test is the measure of workability of concrete mixture. Which is not the type of concrete slump?

False slump

______ is the limit where further loss of water due to evaporation will not result to reduction of volume.

Shrinkage Limit

What is the type of admixture tends to reduce incidence of thermal cracking and maintains concrete workability during large pours or long ready-mix hauls?

Retarding water-reducing admixture

What is the strength of beam sample tested at third point test with applied force of 6850lbs?

570psi

What is the minimum temperature for Stone Mastic Asphalt?

135 - 180°C

Excessive vibration of newly placed fresh concrete may result in:

Bleeding/laitance

The SS designation in an emulsified asphalt means:

Slow setting

The test conducted on a fully cured carbon fiber sheet (CFS) application to determine the adhesion to the substrate is called:

Pull-off test

An asphalt pavement was assessed to have an International Roughness Index (IRI) value of 3.52m/km. In accordance to DPWH Department Order No. 137, series of 2016, the contractor:

Will receive no payment

Compute the % variation in mass of a 19mm diameter deformed steel bar with the following laboratory test data:

4.0%

The sieving process (grain size) does not provide information on:

Shape of the soil grains

How much is the required lapped length of splices of reinforcing bar as per Item 404 when the splice type is compression, and the reinforcement grade is 60?

24D

Unless specified, non-shrink grout shall be placed when in contact with water at ______.

60 minutes

In a stockpile of aoil aggregates, where is the proper location of sampling?

Bottom, middle and top

The following is the result of CHB load bearing compression test:

3.9MPa

As much as possible, placement of reflectorized rummble strips shall be limited to the following locations except:

Urban areas

Which of the following is considered as suitable embankment material?

None of these

What is the yield point and tensile strength of 16mm diameter deformed steel bar with the ff data:

355MPa and 465MPa

Moisture content of straw mats and coconut mats:

20%

Which of the following is not included in rolling requirements during compaction

Primary rolling

In the quality control test of asphalt, this determines the index retained strength of the mix.

Immersion-compression test

Lower penetration indicates what consistency

Hard consistency

Painting a 3-storey building requires 330 gallons of paint. 190 gallons which are latex and 150 gallons are flat enamel. How many gallons of paint must be submitted for quality test?

2 gallons each

Which of the following is a result of improper compaction of an embankment material?

Increase in void spaces

What is the required compressive strength of concrete under Item 406, Prestressed Concrete Structures of the DPWH Specifications?

37.7MPa

Determine the degree of compaction.

77%

What class of concrete and range of slump will you use in concreting thin reinforced section, railings, precast RC piles and cribbing?

Class C w/ slump 2" - 4"

Which of the following is not commonly used as a measure of the hardness of concrete?

Petrographic test

In Item 514, shotcrete shall have a minimum compressive strength of ______ at 28days.

28MPa

The sand used in the field density test in determining the volume of hole using sand cone method must be clean, dry, and passing sieve number _____.

What is the basis of rejection or acceptance of any construction materials?

Materials test report

What is the ideal specific gravity of Portland Cement?

3.15

A new technology used in the non destructive testing of the quality and strength of concrete is through:

Ultrasonic testing

Consolidated test usually performed on ______ samples.

Undisturbed

How many spheres used in abrasion test in grading B?

11 spheres

In Marshall stability test, what happens to the air voids when asphalt increases?

Decrease

Bituminous mixture shall have a minimum dry compressive strength of ______.

200psi

Which of the following tests cannot be performed on disturbed samples from soil exploration?

Consolidation test

If the bulk specific gravity of a bituminous material is 2.342 and the dry stability is 3000lbs, what is its index of retained strength if its wet stability of a soil is 2400lbs?

80%

Undersized reinforcing steel bars that satisfied tensile and elongation requirement maybe accepted provided that its underweight does not exceed:

What is the use of spot test?

To determine overheating of asphalt during manufacturing

It is the method used in determining the strength of concrete pipes

Three edge bearing test

Samples of aggregate base course materials when tested for quality passed the requirements except grading. What will you recommend as ME?

Reprocess the material by blending

Which of the following test is used to confirm the grade of reinforcing steel bars or used to classify steel bars into grade?

Yield strength

Which of the following is acceptable to use to bring down the temperature of the concrete mix?

All of these

Which is not the type of Mineral Admixture for concrete?

Alumina

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 like to occur?

Shoving

Atterberg's limit test are conducted to determine whether the materials passing #200 sieve has the characteristics of a clay or 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 lower permeability

What is the percent of asphalt by weight of total mix?

The rate of loading of the machine will somehow affect the strength of material being tested. The rate of loading that must be observed when testing concrete cylinder specimen is ______.

20 - 50 psi/sec

The maximum percentage abrasion loss allowed for asphalt paving course aggregate is:

40%

Splicing in the same cross section must not exceed ______ of the bars, except as shown on plans.

1/3

The spacing of reflectorized thermoplastic rumble strips ishall be:

200mm to 500mm

Which of the following is the thinnest and most fluid grade of medium cutback asphalt?

MC-30

Quality of factory-produced reinforced concrete pipes may be best established through:

Test of concrete pipe sample

In mixing concrete, water may be measured either by volume or by weight, the accuracy of measuring water shall be within a range of:

1% max

As estimated 15500 units of corrugated GI sheets will be used in the construction of resettlement housing project. How many quality test are you going to prepare?

When cement is placed in contact with the moist aggregates, batches will be rejected unless mixed within _____ hours of such contact

1.5 hours

In metal structures, the minimum number of rivets/nolts for testing purpose is:

5pcs

It is condition applied to hot mixed asphalt (HMA) wherein separation of bitumen film form the aggregate surface primarily due to the action of moisture and moisture vapor.

Stripping

DPWH adopts ______ which is the "Standard Practice for Selecting Proportion of Normal, Heavy Weight and Mass Concrete".

ACI 211.1

What is the required number of blows of each side of the specimen for heavy traffic in the Marshall Method of Design?

How many concrete hollow block units are required for every 10000 units that are to be used for 1 quality test?

100

The proportion mix of mortar for stone masonry shall be:

1 part cement to 2 parts sand

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