Arra 2

Reviewer

Arra 2

50問 • 1年前Reviewer

問題一覧

1.) If the bulk specific gravity of a bituminous mix is 2.343 and the dry stability is 3,000 Ibs., what is its index of Retained Strength (IRS) if its wet stability is 2,400 lbs?

2. A set of three (3) core samples has the following compressive strengths: 4000psi, 3500psi and 2600psi. If the required strength is 3500 psi, the area represented by the core sample is?

Not acceptable

The optimum moisture content of soil is determined during

laboratory compaction

What is the function of emulsifiers in liquid asphalt?

To prevent asphalt from hardening

Which of the following is not type of volume change of concrete?

Alr content

Which of the following are generally true in the production of high-strength concrete?

All of the above

The treatment of fresh concrete with the purpose of retaining sufficient water within the mass to permit hydration of cement is called?

Curing

The purpose of compacting a concrete mix is to?

All of the above

What test determines the resistance to deformation of a compacted asphalt concrete mix?

Ductility test

Consolidation test is usually performed on ________ samples.

Both a and b

Concrete with zero slump means that its water-cement ration is:

Low

In how many hours should concrete core samples be submerged in lime-saturated water before subjecting them to compression test.

At least 30

In the process of compaction of item 200 which contains sandy materials, only 80% density was attained. What is your recommendation in order to comply with the 100% min degree of compaction?

Adjust the water content

What is used to measure pavement surface irregularity

Falling weight defectometer equipment

Which of the following is considered suitable as embankment materials

None of the above

The minimium testing requirements for bituminous mix is one quality test for every tonnes or fraction thereof.

130

Slump is the subsidence of fresh concrete upon removal of a 30-cm truncated cone form. The slump test is performed as field control to

Concrete workability

Concrete in the area represented by the cores will be considered adequate of their average strength is equal to?

At least 85% of and no single core ls less than 75% of f'c

Bleeding of asphalt in a newly paves road is an indication of:

Excessive asphalt cement

What is the minimum sample size needed for testing of cement

20kgs

Before concrete paving, the base of a roadway should be kept in moist condition and saturated with water for at least:

2hrs

Who would take samples of materials and bring them to the laboratory for testing

DPWH materials engineer

In pavement construction, what is the required density of the bituminous mixtures based on laboratory density, of the soil is properly compacted or compacted at maximum density, it will

All of the above

The results of the immersion/ compression test conducted on an asphalt mix sample area as follows: Dry stability = 2000kpa Wet stability = 1000kpa What is the resulting index of retained strength? Does it meet the specification requirement of item 310, bituminous concrete surface course?

50%, No

Under what climatic conditions do we use that lower penetration grade or hard asphalts.

Hot climate

Sampling of freshly mixed concrete shouls be taken on the batch discharge of the transit mixer.

Middle

What is the water-cement ratio that will produce the highest strenght of concrete?

0.45

When using a nuclear density gauge, which of the following is not a requirements?

Operator must wear thick clothes

What is the purpose of test piles?

To determine the required pile length

As constructions work progress, you noticed that the materials delivered at the project site area different from the ones tested and that a passed the requirements. As materials engineer, what would you do?

Conduct immediate ratesting of the materials for verification purposes

The temperature of concrete during the period of mixing while in transport and/or during placing shall not be permitted to rise above.

36C

What is the significance of the loss on ignition of cement?

It signifies pre-hydration or moistwre uptake of cement while it is shelved

Soil properties can be improved by

stabilization

Which of the following factors does not affect the strength of concrete cores drilled from structure?

None of the above

The selection by a standard method of a representative portion of a material for the purpose of ascertaining its characteristics is called:

Sampling

Unsuitable materials for embankment are:

Organic materials such as peat and muck

For efficient compaction, the embankment materials should at the time of rolling be:

Optimum moisture content

The standard test specimen obtained in concrete for building projects is:

Cylinder

What differentiates the composition of the item 201 from 200?

Iterm 201 contains less binder and smaller size of gravel than Item 200

Undersized reinforcing steel bars that satisfy the tensile and elongation requirements may be accepted provided that its underweight does not exceed:

Given : asphalt content of bituminous mix 5.50% Weight of specimen in air = 1200grams Weight of specimen in water =700grams Weight of specimen in SSD = 120Sqrams Calculate the bulk specific eravity of the asphalt specimen

1.576

What will possibly be the result of using different brands of cement in concrete paving?

Different color after it has hardened

Retarders are more usefull during:

Hot weather

A transit mixer for road construction was found to have a 6" slump of fresh concrete intent of the required 3", What will you recommnend if you are the assigned materials engineer?

Reject the concrete mixture

A one-lane road, with a pavement width of 3.5m and shoulder width of 0.5m on each side of the pavement, was designed to have subbased and base corses with a combined thickness of 300mm, the thickness of the subbase is 125mm, the spreading and compaction of the subbase and base oourses shall be carried out in?

3 Iayers over the full width of 4.5m

When the strength test results of concrete beam samples are not acceptable, how many representative core/s shall be taken from each member or area of concrete in-place considered deficient in the newly completed concrete pavement?

At least 3 cores

The workability of a bituminous mix is dependent on the:

Temperature of mix

A mixture of asphalt cement and water with catalytic agent is called:

Emulsified asphalt

ASTM C-150 requires that the 28-day strength of mortar made from Type I Portland Cements be at least 27.6MPA. Three specimens were tested: two passed but one failed by more than 20%, as materials engineer, what will be your conclusion?

Perform and re-test since the date is inclusive

What documentation should be maintained and kept updated by the materials engineer during project implementation.

Materials logbook

PE/PI/ME Exam

denis cagomoc · 106問 · 2年前

PE/PI/ME Exam