Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Transportation > LEC 26 > Flashcards

LEC 26 Flashcards

1
Q

what is the most costly public work in canada

A

the highway system

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what are the most expensive structures to construct and maintain

A

pavement and associated shoulders

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what are the three purposes of pavement (dont explain each)

A

load support
smoothness
drainage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

why pavement - Load support

A

pavement should be stiffer than the material it is placed on so that it can assist in resisting loads without excessive deformation or cracking

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

why pavement - Smoothness

A

pavement material can be placed and maintained to be very smooth reducing vehicle and operating costs.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

why pavement - Drainage

A

drainage material and geometric design can quickly and efficiently drain and reduce ponding

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

why use pavement explain all three

A

Load Support
pavement should be stiffer than the material it is placed on so that it can assist in resisting loads without excessive deformation or cracking

Smoothness
pavement material can be placed and maintained to be very smooth reducing vehicle and operating costs.

Drainage
drainage material and geometric design can quickly and efficiently drain and reduce ponding

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the two main types of pavement and the three others briefly mentioned

A

flexible
composite
rigid
block pavement
roller compacted concrete

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Flexible pavement is asphalt or concrete?

A

asphalt

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

rigid pavement in asphalt or concrete

A

concrete

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

flexible pavement usually have ____ mix surfacng over ____,____,and ___

A

hot asphalt mix surfacing over base subbase and subgrade

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

rigid pavement has ____ slab with or without ____ and placed over ___

A

protland cement concrete slav with or without base and placed over subgrade

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

how does rigid pavement distribute load

A

the pavement structure deflects very little under loading due to the high modulus of elasticity of their surface course

the concrete slab itself supplies most of a rigid pavement’s structural capacity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

how does flexible pavement distribute load

A

it uses a more flexible surface course to distribute loads over a smaller area relying on the combination of layers for transmitting load to the subgrade

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are some applications of felxible pavement

A

traffic lanes
auxillary lanes
ramps
parking areas
frontage roads
shoulders

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

surface course thickness

A

40-75mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

binder course thickness

A

50-100mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

granular base course thickness

A

100mm-300mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

granular sub-base course thickness

A

100-300mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

sublayers of conventional flexible pavement

A

surface course
binder course
granular base course
granular sub-base course
compacted subgrade
natural subgrade

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

in flexible pavements materials are usually arranged in order of

A

descneding load bearing capacity with the highest load bearing capacity material on the top and the lowest load bearing material on the bottom

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

what is the top layer of flexible pavement

A

surface and binder course made of several HMA subbases, they come in contact with traffic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

materials with higher load bearing capacity usually cost

A

more

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

what is the base course

A

the layer below the surface course and consists of aggregate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
what is the subgrade course
the layers under the base
25
what is the prime coat
the application of liquid ashpalt to an absorbent surface
26
what is used to bind the granular base with the HMA layer
the prime coat
27
the prime coat must penetrate into the
the granular layer to plug the voids and forms watertitght surface
28
what is the tack coat
a very light application of liquid asphalt (emulsion)
29
the tack coat is used to ensure...
bond between the layers
30
what are the requirements of a tack coat
thin uniform cover allowed to cure before the HMA is placed
31
what are the advantages of flexible pavement
adjusts to limited differential settlement eeasily repaired additional thickness added any time non-skid properties do not deterioate quieter and smoother tolerates a greater range of temperatures
32
disadvantages of flexible pavements
loses some flexibility and cohension with time needs resurfacing sooner than rigid pavement
33
why are concrete pavements called rigid pavements,
the deflection is very small hence the name rigid pavement
34
typical rigid pavement applications
high volume traffic lanes freeway to freeway connections exit ramps with heavy traffic bus stops high volume intersections
35
components of rigid pavement
surface course (concrete pavement) base course or subbase course or both compacted subgrade
36
what does the surface course of rigid pavement consist of
PCC slab
37
the base course of rigid concrete is below the ____ and consists of ____-
below the surface (PCC layer) and consists of aggregate or stabailiized subfrade
38
the subbase course of rigid pavement is the.....
layer or layers under the base course
39
what is the primary difference between the subgrade of rigid and flexible pavements
there often isnt a subgrade for rigid pavements
40
what is PCC
plain concrete cement
41
the surface course also serves as a.....
waterproofing layer to the underlying base, subbase and subgrade
42
suface course for rigid asphalt thickness
150mm-300mm (6-12in) low to heavy traffic
43
rifid base courses are usually constructed of
aggragate base, stabalized aggragte or soil permeable HMA lean concrete
44
the subbase in rigid concrete is between the
base course and subggrade
45
the subbase quality for rigid pavements
lower quality materials than the base course but better than the subgrade soils
46
a subbase course is not always
needed or used
47
what are the basic components and considerations of a concrete pavement
dowel bars surface texture surface smoothness and rideability longitudinal joints tranvserse joints dowel bars tie bars subgrade base concrete materials
48
what are the type of reinforcing steel in rigid pavement
tie bars dowel bars
49
what joints are used for holding together slabs at longitudinal joints
tie bars
50
what joints are used for holding together slabs at transverse joints
dowel bars
51
joints are purposefully placed at
discontinuities in the rigid pavement subcourse
52
the three kiinds of joints are ( and directions of them )
contraction joint (long,transv) construction joint (long,transv) expansion joint (transv)
53
joints can be formed in what ways
sawed in after pcc placement created by formwork before the pcc is placed
54
why contraction joints
to control cracking due to shrinkage, thermal contraction, moisture or thermal variation within the slab
55
the transverse direction is ____ to the direction of travel
perpendicular
56
constructive joints are used to
separate consecutive construction activities they can be planned to coincide with other joints like traverse contraction joints
57
expansion joints are
provided at a specific location to permit the tthermal expajsion of slab without damaging the adjacent slabs or structures
58
isolation joints are
provided to islate the pavement from adjacent structures and to allow independet movement of the pavement or the structure without causing any damage
59
load transfer refers to
the transfer or dirtbitution of load across discontinuities such as joints or cracks
60
when a wheel load is applied at a joint or crack
both the loaded slab and adjacent unleaded slab deflect
61
load transfer is generally accomplushed using one of the following.....
aggregate interlock dowel bars reinforcing steel
62
LT =
uloaded/loaded
63
types of concrete pavement
jointed plain concrete pavement JPCP jointed reinforced concrete pavement JRPC continuous reinforced concrete pavement CRCP
64
in jointed plain concrete pavement
no steel mesh joint spacing 4-7m slab thickness 200-400mm contraction joints with or without dowel bars use tie bars granular or stabalized base the most common type of rigid pavement
65
jointed reinforced concrete pavement
steel mesh 0.1to0.2% of crosssection area joint spacing 7.5-30m slab thickness 150-400mm contraction joints with dowels granular or stabalized base
66
continously reinforced concrete pavement
reinforcement of 0.5to0.8% of cross section area slab thickness 200-400mm granul;ar or stabalized base
67
dowel bar placement types
dowel baskets dowel bar inserters
68
dowel baskets
simple truss structures used to hold dowel bars at the appropriate height before pcc placement
69
dowel bar inserters
automated attachments to slipform pavers that allow the paver to insert the transverse joint dowel as part of the process
70
advantages of rigid pavement
good durability long service life withstand repeated flooding and subsurface water without deterioration
71
disadvantages of rigid pavement
may lose non-skid surface with time needs even sub-grade with uniform settling may fault at transverse joints
72
transverse joints run
perpendicular to road
73
composite pavements are
composed of both HMA and PCC PCC gives striong base HMA gives smooth and non reflective surface very expensive
74
tie bars run across
longitudeinal joints

Transportation (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions