問題一覧
1
Stability of an asphalt pavement is Its ability to resist shoving and rutting under traffic loads. In general, higher stability of the mix can be attained by using:
angular and rough aggregates, and more asphalt
2
What is the function of emulsifier water in liquid asphalt?
to enable asphalt and water to mix
3
In pavement construction, what is the required density of the bituminous mixtures based on laboratory density of the compacted specimens?
Equal or greater than 95%
4
What is the specification range for asphalt content in a bituminous concrete mix for surface course paving?
5 to 8% of the total dry aggregates mass weight
5
The index of retained strength of the compacted bituminous mixtures is the ratio of the compressive strength of immersed and dry bituminous mixtures. What is the minimum index of retained strength required for bituminous mixtures?
70%
6
The DPWH Spedfications provide ______ tolerance for asphalt pavement thickness.
-5 mm
7
Given: Weight of dry aggregates = 950 grams Weight asphalt = 50 grams What is the percent of asphalt by weight of total mix?
5%
8
Before an asphalt pavement or asphalt surface treatment is placed on a newly prepared granular base, what Is applied?
Prime Coat
9
The asphalt pavement represented by the cores shall not be accepted if the deficiency in density is more than:
2%
10
The results of the Immersion/Compression test conducted on an asphalt mix sample are as follows: Dry stability = 2,000 kPa Wet Stability = 1,000 kPa What is the resulting Index of Retained Strength? Does it meet the specification requirement of item 310, Bituminous Concrete Surface Course?
50% No
11
Bleeding of asphalt in a newly paved road Is an Indication of:
excessive asphalt content
12
In specifying an asphalt material, what does term 60-70 refer to?
Penetration grade
13
What is the rate of application for Bituminous Tack Coat?
0.2 to 0.70 L/m^2
14
What kind of asphalt that contains at least 60% asphalt cement?
Asphalt Emulsion
15
What kind of asphalt that has a penetration grade of 0 to 30 mm?
Blown Asphalt
16
Overheating during production is determined by:
Spot test
17
What is the % weight of aggregates (coarse, fine and mineral filler) in the mixture of Bituminous Concrete Surface Course?
92% to 95%
18
A gauge of adhesiveness Of asphalt cement.
Ductility
19
Prime coat shall be left undisturbed for at least
24 hours
20
A measure of relative hardness of asphalt cement.
penetration
21
The penetration of concrete joint sealer, Hot Poured Elastic Type shall not exceed _____
90
22
What is the minimum Index of Retained Strength of the mixture?
70%
23
What is the minimum temperature of the mixture as measured in the truck just prior to dumping?
107 degrees C
24
Cutback Asphalt & Emulsifled asphalt is usually used as
Prime coat
25
Rate of application for prime coat
1 to 2 li/sq.m.
26
If no core was taken at the end of each day's operation and the project has already been completed, a core shall be taken for
1 pc @ every 100m/lane
27
What Is the laboratory test that determines the asphalt content of the Asphalt Mix?
extraction test
28
What kind of bituminous material that is a blend of asphalt cement and petroleum solvent?
cutback asphalt
29
The extraction test on asphalt mixes is performed to determine
the amount of asphalt in the mix
30
What is the Index of retained strength if Wet stability = 2400 dry stability = 3000
80%