3. CCME REVIEW SAMPLE QUESTION (201-300)

For Contractor Consultant Materials Engineer

PLASTIC LIMIT

Water content at which soil passes from semi – solid to plastic state.

SHRINKAGE LIMIT

Water content at which soil passes from solid to semi – solid.

tie bars

Steel bars placed along longitudinal joints to hold the adjoining slabs together are called _____

shall be removed and replaced (but if high spots being noted exceeds 3 mm but not exceeding 12 mm, it shall be ground down only.

The concrete pavement surface shows high spots of 15 mm in a 3 – m straight edge. The concrete in the area represented by these high spots _____

Once a year

The calibration of the Universal testing machine is conducted _____

1 sample per 130 tonnes

What is the sampling requirement of bituminous mixture?

2 inches

What is the depth of the thermometer inserted in the bituminous mixture?

1800 lbs

In the design of bituminous mix, the design criteria for stability under the Marshall Stability Method for heavy traffic is

60°

The stability criteria of the Marshall Stability Method is the maximum load resistance that a specimen will develop at

75 blows

Bituminous mix specimens are compacted at how many blows at each end for a heavy traffic design under the Marshall Stability Method?

85 – 100

In a penetration test, if the penetration is 9. What is the grade of the asphalt?

Portland Pozzolan Cement Type 1P

In case of scarcity or non – availability of Type I Portland cement, what type of pozzolan shall be used?

4.50 MPa

The required flexural strength of concrete beam sample of Item 311 when tested by the midpoint method.

Steel forms of an approved section

The required forms to be used in concrete pavement are _____

Within 24 hours

Sowing of the weakened plane joints shall be done usually at _____

24 hours

Removal of forms of concrete pavement

1-½ inches

The required slump of concrete using slip – form method of paving is _____

25% or more

Deficiency in strength of concrete specimen wherein no payment of contract price allowed is _____

1,000 ln.m

What is the length of a lot of pavement when a single traffic lane is poured?

500 ln. m

What is the length of a lot of pavement when two lanes lane are poured concurrently?

150 mm x 150 mm x 525 mm

What is the required size of concrete beam sample?

1 set

What is the required number of set of concrete beam specimens to be taken from each 330 sq. m of pavement of fraction thereof placed each day?

80% of the designed 28 - day compressive strength

What is the required compressive strength that concrete piles be moved?

6d

The required circular pin diameter used to bend 10 – 20 mm Ø reinforcing steel.

4 to 6 rpm

The mixing speed of the transit mixer during batching.

10 to 20 cm

What is the slump of concrete Class A deposited in water?

Prime Coat

This item shall consist of preparing and treating an aggregate base course preparatory to the construction of a bituminous surface course.

Item 304

What item no. is Bituminous Surface Treatment?

± 0.4%

What is the required tolerance for bituminous material in job – mix formula for Item 310?

Seal Coat

This item consists of an application of bituminous material with or without the application of aggregate on existing bituminous surface?

± 10°C

Job – mix tolerance for temperature in the mixture for Item 310.

150 mm x 150 mm or 100 mm Ø

What is the size of the sample in Item 310 taken for each full day’s operation?

107°C

What is the required temperature of mix in item 310 when placed?

5 kph

The required speed in rolling in Item 310.

faulting

It is the resulting difference in elevation across a joint or crack.

100 mm

In core specimen asphalt mix thickness determination, it shall have a diameter of at least ______

± 1.0 mass %

In batching concrete mix, the accuracy of cement content shall be _____

800 mm

Minimum thickness measured perpendicular to the slope using Class D stones for riprap.

Tack Coat

This item shall consist of preparing and bearing an existing bituminous or cement concrete surface with bituminous materials preparatory to the construction of bituminous surface course.

0.9 to 1.8 lit per m2

What is the rate of application of bituminous seal coat using asphalt cement?

1.5 to 3.0 lit per m2

What is the rate of application of bituminous seal coat using cut – back asphalt?

6 mm

What is the maximum tolerance of the variation of the surface of Item 310 from the testing edge of the straight edge between any two contacts with the surface?

1.40 MPa

What is the minimum dry compressive of Item 310?

70% minimum

What is the required Index of Retained Strength of Item 310 when tested by AASHTO T 65?

±7

Job – mix tolerance in Item 310 for grading, passing No. 4 and larger sieve.

±4

Job – mix tolerance in Item 310 for grading, passing No 8 to No. 100 (inclusive).

±2

Job – mix tolerance in Item 310 for grading, passing No. 200 sieve.

stability

The property of asphalt mix to resist deformation from imposed load.

durability

The property of asphalt mix to resist the detrimental effects of air, water, temperature and traffic.

fatigue resistance

The property of asphalt mix to withstand repeated flexing caused by the passage of wheel loads.

flexibility

The property of asphalt mix to bend slightly without cracking and to conform to gradual settlements and moments of the base and subgrade.

92% to 95%

The range of aggregates composition in Item 310.

Immersion – Compression Test

What is the test on asphalt in order to determine the effect of water on the cohesion of the mix?

60 – 70 and 85 – 100

In temperate countries like the Philippines, what is the most commonly used grade of asphalt cement?

stability

To determine the thickness _____ of asphalt, Immersion – Compression Test is performed.

decrease

Percent air voids will _____ as percent asphalt increases in Marshall Stability.

armored thermometer

To determine the temperature of delivered asphalt mix, what apparatus is used?

highly organic soils

Peat and muck soils are considered as:

to check the suitability of materials, efficiency of the equipment used and the construction method.

Why is it that a trial section is conducted in sub – base or base course construction?

excessive asphalt content

What does it mean when there is bleeding in a newly paved asphalt road?

low liquid limit and low plastic limit

A good subgrade soil should have the following:

determine the trend of its strength development

Concrete samples may be tested at an earlier stage in order to _____

0.3 mm crack

What is the test criterion for reinforced concrete pipe tested in a three – edge bearing test machine?

20 to 50 psi/second (compression); 125 – 175 psi/second (flexural)

In testing concrete cylinder sample, the applied load should be continuous without shock at a constant rate within the range of _____

be retested prior to use

Cement which has been in storage for a long period of time and that there is already doubt as to its quality should:

stabilization

It is a process of improving the properties of soil to make it more suitable for a particular purpose.

referee test

Two tests are done in one lot sample. The test differs from each other, third test is taken. What will be this test?

Yes, 3,500 psi at 14 days

If no beam sample taken to determine the strength of concrete pavement, is it allowed in DPWH specs to use core samples to determine the strength. What is the required compressive strength?

tacky

Tact coat must be at what condition prior to the application of asphalt mix?

induce risk of corrosion in reinforcing steel

The use of sea water in reinforced concrete may _____

weak subgrade

Subgrade having a CBR value of 2% or less is considered _____

very stable

Subgrade having a CBR value of 15% or more is considered _____

normal

Subgrade other than those defined in between the categories is considered ___

granular soil, fine grained soil, organic soil

What are the three (3) major groups of soil?

to determine the degree of compaction of soil. It is also a control test in embankment construction to ensure adequate compaction.

What is the significance of field density test?

true

Weighing hot sample is not advisable because it affects the accuracy of the result. True or false?

air dry the sample under the heat of the sun

How to prepare or to come up with an air – dried sample?

oven – dry the sample @ 60°C

If it is impossible to air – dry the sample under the heat of the sun, what alternative should be used?

Method A & B – use sample passing No. 4

Method C & D – use sample passing ¾ inch

Sample for compaction test should pass to what sieve size?

T – 99 uses 2.5kg (5.5lbs) rammer with a 12” drop while T – 180 uses 4.54 kg (10lbs) rammer with an 18” drop.

What is the difference between T – 99 and T – 180 compaction test method?

it is the determination of particle size distribution in soils by sieve, hydrometer or a combined analysis

What is Particle size analysis?

distilled water

What kind of water shall be used in laboratory test especially if it deals with chemicals?

10 mm

Liquid limit brass cup w/ sample is raised and allowed to drop sharply on the base through a height of _____?

2 rps

How many rotations per second will the crank of a liquid limit be rotated

3.2 mm (1/8”)

In doing a plastic limit test, to what Ø will the soil thread begin to break?

It is used in a gravimetric – volumetric relationship in soils (or defined as the ratio of the wt. in air of an equal volume of water at a stated temperature)

What is specific gravity?

335 sq.m

What is the approximate area for density control strips?

Item 104

What Item of work is embankment?

Aggregate sub – base course

What kind of material for Item 200?

All particle size will pass sieve 75 mm or 3” openings and not more than 15 mass % will pass 0.075 mm. (AASHTO T 11)

What is the required particle size for selected borrow for toppings under Item 104?

100%

What is the minimum degree of compaction for Item 200 and 201?

Maximum dry density (MDD) and Optimum moisture content (OMC)

What is the highest point in the moisture density curve of the moisture density relation test or compaction test?

Any clean, dry, free – flowing, uncemented sand passing No. 10 and retained No. 200 sieve

What is the required size of calibrated sand used for field density test (FDT)?

½ inch (12.7 mm)

What is the standard diameter of an orifice of an FDT sand cone?

sand cone, jug (at least 4 liters), guide plate, moisture cans, calibrated sand, weighing scale, oven with temperature control, chisel or digging tool, plastic bags and labeling materials (tag name)

What are the apparatus used in FDT?

15 to 19 hours

How many hours does a fine aggregate tested for specific gravity and absorption be soaked in water?

It is determined by the use of cone test for surface moisture. If the molded shape of fine aggregate slumps slightly, it indicates that it has reached a surface dry condition

How to determine if the fine aggregate reaches the saturated dry condition?

Fine aggregate = grading, specific gravity, absorption, dry unit weight: Coarse aggregate = grading, specific gravity, absorption, dry unit weight and abrasion

Note: Soundness test is also performed as per request

What are the tests required for concrete aggregates?

Approximately 46.8 mm Ø and each weighing between 390 – 455 grams

What are the size or diameter and weight of cast – iron spheres used in abrasion test?

5,000 grams ± 25 grams

What is the required total weight of sample for abrasion test of coarse aggregate, grading A with 12 as number of spheres?