lec 27

Question 1

what are the primary materials of asphalt mixes

Answer 1

asphalt binders
aggregate
reclaimed asphalt pave,ent

Question 2

hot mix asphalt is made up of

Answer 2

graded aggreagates
asphalt binder

Question 3

hot mix asphalt is used to construct

Answer 3

highways
airfield pavements
parking lots
automobile race tracks
lining reservoirs
railroad tracks

Question 4

differwnt types of paving binders

Answer 4

asphalt
bitumen
tar
cutback
emulsion
mopdified binders

Question 5

asphalt biners + aggregates =

Answer 5

hot mix asphalt

Question 6

asphalt cement is tar

Answer 6

no you fucking idiot its not

Question 7

whats the dif between tar and asphalt

Answer 7

tar is dark brown not naturally occuring maufactured from coal and does not dissolve in pertroleum

asphalt is dark brown to black,
naturally occuring
produced by petreoleum distillation
dissolves in petroleum.

Question 8

what is asphalt

Answer 8

a high molecular wieght thermoplastic hydrocarbon

Question 9

asphalt can occure

Answer 9

naturally - pitch lake in trinidad and lake bermudex in venexulea

Question 10

asphalt has been used for

Answer 10

thousand of years, mesopotamia & ancient egypt used as an adhesive and waterporrfing

Question 11

the first asphalt road in the us

Answer 11

1870 in new jersey

Question 12

ashpalt is the “best…”

Answer 12

best glue in the world

Question 13

crude oil was formed

Answer 13

millions of years ago by the bvacterial decomposition of organic matter, both plant and animal, buried under heavy layers of our earths sediment

Question 14

crude oil is considered sweet if it contains

Answer 14

less than 0.5% sulfur

Question 15

light oil has a lower

Answer 15

density - lighter than water floats

Question 16

heavy crude oil has a

Answer 16

hugher density - heaavier than water - sinks

Question 17

heavier crude oil is

Answer 17

harder to refined, it is alkso known as tar sands because of its high bitumen content

Question 18

properties depend on :

Answer 18

refinery operations
composition crude source-dependant

Question 19

asphalt cement is known as

Answer 19

bottom of the barrel, it sinks pookie

Question 20

what is atmospheric distillation

Answer 20

the distillation principle is based on the concept that various crude fractions which have different boiling ranges

Question 21

to use an asphalt binder…

Answer 21

it must be made into a liquid

Question 22

asphalt requires heat to

Answer 22

reduce viscosity for various applicaion

heat it

thin it with solvents (cutbacks(
suspended it in water (emulsions)

Question 23

asphalt binders are ____ at room temp

Answer 23

solid pookie

Question 24

a cutback asphalt is simply a

Answer 24

combinayion of asphalt cement and petroleum solvemt

Question 25

cutback asphalts are graded by

Answer 25

viscotisy, a viscosity of 30 is more fluid than a visocisity of 3000

Question 26

emulsified asphalt is simply a

Answer 26

suspension os small asphalt of cement dropelts in water which is assisted by an emulsifying agen such as soap

Question 27

emulsified asphalt typically contains

Answer 27

50-70% asphalt, 0.1-2% emulsifying agent

Question 28

on the basis of electrical chatege surrounding the asphalt droplets

Answer 28

anionic (-ve) cationic (+ve) non-ionic (neutral)

Question 29

anionic ......

Answer 29

-ve charged particules suitable for calcareous aggregate like lime stone. dolomite

Question 30

cationic .....

Answer 30

-ve charged, most widely used, suitable for siliceos aggregates like quartzite, sandstone , granite, etc

Question 31

non-ionic....

Answer 31

neutral particles rarely used in the road constructuion

Question 32

once an emulstion is applied tyo a surfasce

Answer 32

the bitument must separate from the liquid phase, the water is removed while the bitumen remains to coat the surface. separatio of the bitument and water may be due to evaporation or due to the chemical nature od the surface

Question 33

polymer modified asphalt is

Answer 33

asphalt + polymer (you fucking dingus)

Question 34

higher stiffness modified binders will...

Answer 34

reduce rutting and shoving

Question 35

lower stiffness and faster relaxation properties will ...

Answer 35

reduce thermal cracjking

Question 36

increased adhesion between the asphalt binder and the aggragate in the precense of moisture will

Answer 36

reduce stripping