201-300

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

PLASTIC LIMIT

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

SHRINKAGE LIMIT

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

tie bars

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 _____

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 calibration of the Universal testing machine is conducted _____

Once a year

What is the sampling requirement of bituminous mixture?

1 sample per 130 tonnes

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

2”

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

1800 lbs

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

60°

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

75 blows

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

85 – 100

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

Portland Pozzolan Cement Type 1P

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

4.50 MPa

The required forms to be used in concrete pavement are _____

Steel forms of an approved section

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

Within 24 hours

Removal of forms of concrete pavement

24 hours

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

1 ½ inches

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

25% or more

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

1,000 ln.m

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

500 ln. m

What is the required size of concrete beam sample?

150 mm x 150 mm x 525 mm

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?

1 set

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

80% of the designed 28 – day compressive strength

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

6d (20 mm – 25 mm Ø = 8d: 28 mm Ø and above = 10d)

The mixing speed of the transit mixer during batching.

4 to 6 rpm

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

10 to 20 cm

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

Prime Coat

What item no. is Bituminous Surface Treatment?

Item 304

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

± 0.4%

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

Seal Coat

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

± 10°C

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

150 mm x 150 mm or 100 mm Ø

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

107°C

The required speed in rolling in Item 310.

5 kph

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

faulting

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

100 mm

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

± 1.0 mass %

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

800 mm (Class A – 300 mm; Class B – 500 mm; Class C – 600 mm)

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.

Tack Coat

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

0.9 to 1.8 lit/m2

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

1.5 to 3.0 lit/m2

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?

6 mm

What is the minimum dry compressive of Item 310?

1.40 MPa

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

70% minimum

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

±7

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

±4

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

±2

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

stability

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

durability

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

fatigue resistance

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

flexibility

The range of aggregates composition in Item 310.

92% to 95%

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

Immersion – Compression Test

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

60 – 70 and 85 – 100

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

stability

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

decrease

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

armored thermometer

Peat and muck soils are considered as:

highly organic soils

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

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

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

excessive asphalt content

A good subgrade soil should have the following:

low liquid limit and low plastic limit

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

determine the trend of its strength development

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

0.3 mm crack

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

Stabilization

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

referee test

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?

Yes, 3,500 psi at 14 days

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

tacky

The use of sea water in reinforced concrete may _____

induce risk of corrosion in reinforcing steel

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

weak subgrade

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

very stable

Subgrade other than those defined in the two above categories is considered ___

normal

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

granular soil, fine grained soil, organic soil

What is the significance of field density test?

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

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

true

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

air dry the sample under the heat of the sun

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

oven – dry the sample @ 60°C

Sample for compaction test should pass to what sieve size?

Method A & B – use sample passing No. 4, Method C & D – use sample passing ¾ inch

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

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 particle size analysis?

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

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

distilled water

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

10 mm

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

2 rps

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

3.2 mm (1/8”)

What is specific gravity?

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 the approximate area for density control strips?

335 sq. m

What Item of work is embankment?

Item 104

What kind of material for Item 200?

Aggregate sub – base course

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

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 minimum degree of compaction for Item 200 and 201?

100%

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

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

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

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

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

½ inch (12.7 mm)

What are the apparatus used in FDT?

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)

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

15 to 19 hours

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

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

What are the tests required for concrete aggregates?

Fine aggregate = grading, specific gravity, absorption, dry unit weight: Coarse aggregate = grading, specific gravity, absorption, dry unit weight an d abrasion, Note: Soundness test is also performed as per request