YT1 Materials Engineer EXAM

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What is the test frequency of concrete compressive and flexural strength?

1 set per 75m3

How many set of concrete beam specimen are you going to prepare for 800m3 of concrete mix?

Concrete specimen in a molded in a 6" diameter by 13" cylinder should be rodded _____ times per layer.

Concrete specimen molded in a 6" x 6" x 21" should be rodded _____ times per layer.

Maximum temperature of fresh concrete.

32°C

Immersion depth of thermometer when getting fresh concrete temperature.

Used to monitor the consistency of unhardened concrete.

Slump test

How many strokes per layer is applied on slump test?

What is the approximate depth of the first layer of slump test

67mm

What is the approximate depth of the first plus second layer on slump test?

155mm

Water curing temperature for concrete samples.

23 + - 2 °C

Condition of concrete during compression test.

Moist

Specimen test at 28 days shall be broken within the permissible time tolerance of _____ ?

20H

Criteria for acceptance of concrete.

All of the set of 3 exceeds specified strength and no individual strength deficient of by 15%

Concrete deemeed to be not acceptable using compressive strength criteria may be rejected unless the contractor can provide evidence by means of coring. Concrete represented by cores will be considered if:

Average strength of cores is equal to at least 85% and no single core is less than 75% f'c.

Truck mixer mixing speed shall be within _____ .

4-6 rpm

Maximum drop height of placing concrete mixture shall be _____ .

1.5m

Prestressed concrete requires the use of Class ___ concrete.

What is the minimum cement content per m3 on a Class C concrete?

9.5 bags

The boundary between sand and gravel is ___.

4.750 mm (#4)

Concrete not placed within ____ minutes from the time the ingredients were charged into the mixing drum shall not be used.

For sampling of sand from stockpile, what is the size of tube to be inserted in the pile at random location?

30mm diameter, 2m long

What is the unit weight of steel?

7850 kg/m3

Whay is the unit mass of a 10mm diameter RSB?

0.617 kg

What is the nominal weight of 16mm diameter x 6m length RSB?

9.468 kg

What is the permissible variation in actual weight of a steel bar from theoretical weight?

You are an experienced materials engineer of your firm. During compaction you found out that the soil is too wet. What economical recommendation will you give?

Scarify and dry the soil by exposing it to air under suitable conditions

Clays when removed from the borrow pits come out in the form of chunks. If you are the assigned materials engineer in the field, what is the most suitable compacting equipment will you recommend?

Sheep's foot roller

As an experienced field materials engineer, without the aid of laboratory equipment, it happens that your sample is hard. What practical method will you se in determining wheter your hard sample is soil or rock?

By submerging into water

A materials engineer can easily identify whether the soil sample is plastic without the aid of laboratory equipment.

Sample of moist soil molded and rolled into thin threads without breaking or crumbling

What is the estimated diameter of the soil thread when rolled between tue palm of the hand and the glass plate begins to crumble in plastic determination?

1/8" (3mm)

You are the materials engineer of a construction firm doing earth road construction. During the progress of construction a highliy organic soil was encountered. What will you recommend to your firm?

Remove and replace with more suitable materials

You are the materials engineer of your firm. It so happen that in the preparation of the as-staked plans it was found out that there was an increase and new additional items of work from the original quality control program submitted.

Revise the quality control program

If there is a strength deficiency in the concrete specimens and it is not feasible or not advisable to obtain cores from the structure due to structural considerations, as a materials engineer, what will you recommend?

Recommend immediately adjusted price of payment with respect to the deficiency incurred

Vibratory steel wheel roller for compaction shall have a minimum mass of ___ tons.

Free haul distance if not provided in the contract shall be _____.

600m

What type of concrete specimens shall be taken in pavement structure?

Beam

Flexural strength of Protland Cement Concrete Pavement (PCCP) when tested at third point?

3.8 MPa (@ 14days)

What is the mininum required cement content per cubic meter of concrete to meet the minimum strength for Item 311 PCCP?

364 kg

What is the maximum spacing for operating vibrators?

60 cm

In no case shall the vibrator be operated longer than ___ seconds in one location.

Sawed construction joint shall be created by sawing groves in the surfacenof the pavement of the width not more than ___ mm and depth not less than ___ mm.

6mm width and 50mm depth

Sawing of the joint shall commence as soon as concrete has hardened sufficiently to permit sawing without excessive raveling usually _____ hours

4 to 24 hours

When there is an interruptions of more than 30 minutes in concreting operations, no transverse joint shall be constructed within ___ meters of an expansion joint, contraction joint, or weakened plane joint.

1.5 meters

The brooming corrugation on pavement shall be uniform in appearance and not more than ___ mm in depth.

1.5mm

Concrete pavement surface when tested with a 3m straight edge shall have a maximum surface deviation of _____?

3mm

If the strength requirement for Item 311 PCCP does not meet the strength requirement and is not feasible to obtain cores, payment of concrete will be made at an adjusted price due to strength deficiency. What is the strength percent deficiency of the specimen for the item to be paid 100 of contract price?

Less than 5

How many cores shall be obtained on each lot for pavement thickness determination

When any core is deficient by more than 25mm, additional cores shall be taken at what interval parallel to the center line in each direction from the affected location?

When average thickness of the pavement per lot is deficient by more than 25mm. What will be the price adjustment?

Remove and replace/no payment

What is the degree of compaction of soil if the wet density is 2200 kg/m3 with an actual moisture content of 10.2% and maximum dry density of 1960 kg/m3?

101.86

Prime coat shall be left undisturbed for at least _____.

24 hours

_______ is applied on existing bituminous or cement concrete surface.

Tack coat

Classification of soil which 35% or less the particles pass through #200 sieve.

Granular materials

Classification of soil which 35% or more of the particles pass through #200 sieve.

Silty clay materials

The minimum penetration of the preservative into the surface of the timber shall be ______?

20mm

How many hours do aggregate stockpile or binned for draining before being batched?

12 hours

Cast in place concrete shall not be post-tensioned until at least ____ days and until the compressive strength has reached the strength specified.

Tests for course aggregate include ______.

Abrasion and absorption

Test for fine aggregate include ________.

Gradation and mortar strength

Quality determination of concrete coarse aggregate sample requires ______.

Abrasion test and sieve analysis (grading)

It is particles of rock which pass #3 sieve and retained on a #10 sieve.

Gravel

Pouring permit duly approved and issued by

DPWH Project Engineer

In conducting AASHTO T96, what is the diameter of steel spheres used?

46.8mm

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.

0.5%

How many spheres are used in abrasion test grading A at 500 revolutions?

Submission of sample for testing for cement is _____.

10kg

______ is the slump of workable concrete if vibrated.

10 - 40mm

Which plasticity index is most suitable for aggregate base course? The fraction passing the 0.425mm (#40) shall have a liquid limit not greater than 25 and plasticity index not greater than 6.

______ is the method in determining the strength of concrete pipes.

Three-edge bearing test

If an asphalt pavement will be constructed over an old existing concrete pavement, ________ should be applied to the concrete pavement.

Tack coat

Coarse aggregate for Bituminous Macadam Pavement should be ______.

Crushed gravel or stone

Unless otherwise specified in the special provision, the type of Portland cement used in paving concrete shall be ______.

Type I

During construction of a road project, if all the materials to be used are tested for quality, inspection are no longer required

False

The degree of compaction of an embankment in our present specification is based on ______.

AASHTO T-180

A soil with a Group Index of 5 is stronger than another with a Group Index of 10.

True

This typical material of this group is fine beach sand or fine desert blow sand without silty clay fines or with very small amount of non-plastic silt.

Group A-3

Rock excavation consist of igneous, sedimentary, or metamorphic rock which cannot be excavated without blasting or the use of rippers, and all boulders or other detached stone each having a volume of ______.

1 cu.m.

What is the minimum quantity per linear meter for steel pipes galvanized?

2pcs 100mm (taken at both ends w/o threads)

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

5.0%

The contractor shall submit in writing a job mix formula for the mixture supported by laboratory test daya along with samples of resources of components and viscosity - temperature relationships to the engineer for testing and approval at least _____.

Three weeks

The penetration test is an indication of the _____ of asphalt.

Consistency

Specification requires 1 quality test for every _____ of asphalt

40 tons

_____ is an indication that the asphalt mix is overcooked.

Blue smoke

In soil, all boring shall be carried to a depth of at least ______ below the grade line.

1.5m

_______ is the moisture in an air dried soil.

Hygroscopic Moisture Content

In which DPWH item is emulsified asphalt not suitable?

Item 301

Asphalt cement shall not be used while it is foaming nor shall be heated at _____ anytime after the delivery

159°C

How many gradation ranges for hot asphalt mix bituminous pavement are there in the blue book?

What is the plasticity index of mineral filler?

Not greater than 4

Paint contains ______ of pigment and ______ vehicle.

21% and 79%

If the dry stability is 1300psi, wet stability is 1250psi, and air voids of 3%, what is the index of the retained strength?

96.15%

_____ is the temperature tolerance of mix in bituminous after job-mix is established.

10°C

In a soil exploration, if the characteristic of rock is questionable, the minimum depth of boring into the bedrock should be ______.

3.0m

When group index = 0, what is the grade of soil?

Good soil

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

Shrinkage Limit

It evaluates the quality of the soil as highway subgrade material.

Group Index

Failed sample does not neccessary mean that the structure it represents is defective. Why?

Maybe sampling is incorrect.

Before the project starts the Materials Engineer or technician must have a program on how many samples for each item of work should be tested based on minimum testing requirements. What program or report is this?

Quality control program

100

As the work progresses the Materials Engineer should know how many samples have been submitted and tested, in other words the Materials Engineer must refer to what report so that he/she may be updated on the balance and on file quality test of the construction materials being used in the project?

Status of test

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Practical Problems and Experiences 6

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Item 201 Aggregate Base Course

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Item 202 Crushed Aggregate Base Course

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Item 303 Bituminous Seal Coat

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