Superpave Summary

8/12/2019 Superpave Summary

1/60

FHWA Condensed Superpave

Asphalt Specifications

Lecture Series

SUPERPAVE


2/60

Aggregates

Usually refers to a soil that has in some ay!een processed or sorted"


3/60

A##re#ate Si$e %efinitions

& Nominal Maximum A##re#ate Si$e' one si$e lar#er than the first sieve to retain

more than ()*

& MaximumA##re#ate Si$e' one si$e lar#er than nominal ma+imum

si$e

100100

1001009090

7272

6565

4848

3636

2222

1515

99

44

100100

99998989

7272

6565

4848

3636

2222

1515

99

44


4/60

100100

00.075.075 .3.3 2.36 2.36 4.75 4.75 9.59.5 12.5 19.012.5 19.0

Percent PassingPercent Passing

control pointcontrol point

restricted zonerestricted zone

max density linemax density line

maxmax

sizesize

nomnom

maxmax

sizesize

Sieve Size mm! "aised to 0.45 Po#erSieve Size mm! "aised to 0.45 Po#er


5/60

Superpave A##re#ate ,radation

100100

00.075.075 .3.3 2.36 2.36 12.512.5 19.019.0

Percent PassingPercent Passing

Design Aggregate StructureDesign Aggregate Structure

Sieve Size mm! "aised to 0.45 Po#erSieve Size mm! "aised to 0.45 Po#er


6/60

Superpave -i+ Si$e

%esi#nationsS$%er%aveS$%er%ave &om 'ax Size&om 'ax Size 'ax Size'ax Size

(esignation(esignation mm! mm! mm! mm!

37.5 mm37.5 mm 37.5 37.5 50 50

25 mm25 mm 25 25 37.5 37.5

19 mm19 mm 19 19 25 25

12.5 mm12.5 mm 12.5 12.5 19 19

9.5 mm9.5 mm 9.5 9.5 12.5 12.5


7/60

Gradations

* Considerations:- Max. size < 1/2 AC lift thickness

- Larger max size

!ncreases strength

!m"ro#es skid resistance

!ncreases #ol$me and s$rface area of agg

%hich decreases re&$ired AC content !m"ro#es r$t resistance

!ncreases "ro'lem %ith segregation of "articles- (maller max size

)ed$ces segregation

)ed$ces road noise

ecreases tire %ear


8/60

Percent Crushed Fragments in

Gravels

& .uarried materials alays ())* crushed

& -inimum values depended upon traffic

level and layer /lift0

& %efined as * mass ith one or more

fractured faces


9/60

Percent Crushed Fragments in

Gravels

+, Cr$shed 1++, %ith 2 or MoreCr$shed aces


10/60

Coarse Aggregate Angularity

Criteria

raffic e"th from ($rfaceMillions of (ALs < 1++ mm 0 1++

mm< +.

< 1

< < 1+

< +

< 1++

1++

/--

3/--

4/--5/5+

6/6+

1++/1++

1++/1++

--/--

--/--

+/--3+/--

5+/4

6/6+

1++/1++

irst n$m'er denotes , %ith one or more fract$red faces

(econd n$m'er denotes , %ith t%o or more fract$red faces


11/60

Asphalt Cements

1ac2#round

History of Specifications


12/60

1ac2#round

& Asphalt' Solu!le in petroleum

products

' ,enerally a !y3product ofpetroleum distillationprocess

' Can !e naturallyoccurrin#

& 4ar'Resistant to

petroleum products

',enerally !y3productof co2e /from coal0

production


13/60

Penetration 4estin#

& Sein# machine needle

& Specified load5 time5 temperature

1++ g

!nitial

7enetration in +.1 mm

After seconds


14/60

Penetration Specification

& Five ,rades

& 6) 3 7)& 8) 3 9)

& :7 3 ())

& (;) 3 (7)

& ;)) 3


15/60

%uctility


16/60


17/60

Viscosity ,raded Specifications


18/60

4ypes of Viscosity 4u!es

As"halt !nstit$te $'eietf$chs Cross-Arm

$'e


19/60

4a!le ( E+ample

AC 2.AC 2. AC 8+AC 8+

=isc9 3+C=isc9 3+C 2+2+ + 89++++ 89+++ 5++5++

=isc9 1C=isc9 1C 5+ 5+ ++++

7enetration7enetration 2++2++ 2+ 2+

=isc9 3+C=isc9 3+C


20/60

8+

+

3+

4+5

1++

12+

1+

2++++

7enetration >rades

AC 8+

AC 2+

AC 1+

AC

AC 2.

1++

+

1+

=iscosit:9

3+C?

18+-@


21/60

Asphalt Cements

;e% ($"er"a#e 7erformance >raded ("ecification


22/60

P, Specifications

& Fundamental properties related to

pavement performance

& Environmental factors

& =n3service > construction temperatures

& Short and lon# term a#in#


23/60

Hi#h 4emperature 1ehavior

& Hi#h in3service temperature

'%esert climates

'Summer temperatures& Sustained loads

'Slo movin# truc2s

'=ntersections

Viscous Liquid


24/60

Pavement 1ehavior

/Warm 4emperatures0

& Permanent deformation /ruttin#0

& -i+ture is plastic& %epends on asphalt source5 additives5 and

a##re#ate properties


25/60

Permanent %eformation

$nction of %arm %eather and traffic

Co$rtes of BA


26/60

Lo 4emperature 1ehavior

& Lo 4emperature

'Cold climates

'Winter& Rapid Loads

'Fast movin# truc2s

Elastic Solid

= E

Hoo2e?s La


27/60

Pavement 1ehavior

/Lo 4emperatures0

& 4hermal crac2s

'Stress #enerated !y contraction due to drop in

temperature

'Crac2 forms hen thermal stresses e+ceed

a!ility of material to relieve stress throu#h

deformation

& -aterial is !rittle

& %epends on source of asphalt and a##re#ate

properties


28/60

4hermal Crac2in#

Co$rtes of BA

S A h lt 1i d


29/60

Superpave Asphalt 1inder

SpecificationThe grading system is based on Climate

7> 38 - 22

Performance

Grade

Average 7-day max

pavement temperature

Min pavement

temperature


30/60

Pavement 4emperatures are Calculated

& Calculated !y Superpave softare

& Hi#h temperature';) mm !elo the surface of mi+ture

& Lo temperature

'at surface of mi+ture

Pave temp = f air temp! depth! latitude"


31/60

Concentric Clinder

Concentric Cylinder Rheometers

)= Mi )i2L

= ))o- )i


32/60

%ynamic Shear Rheometer /%SR0

& Parallel Plate#hear flo$ varies $ith

gap height and radius

%on-homogeneous flo$

))

h

)2 M

)

S) * +i d , i


33/60

S)ort *erm +inder ,ging

& "olling *)in -ilm ven

'Sim$lates aging /rom )ot mixing and constr$ction


34/60

Pressure A#in# Vessel

/Lon# 4erm A#in#0& Sim$lates aging o/ an as%)alt

inder /or 7 to 10 years

& 50 gram sam%le is aged /or 20

)o$rs

& Press$re o/ 2070 Pa 300 %si!

& ,t 90 100 or 110


35/60

1endin# 1eam Rheometer

Air 1earin#

Load Cell

%eflection 4ransducer

Fluid 1ath

Computer


36/60

%irect 4ension 4est

Le

L

Load

Stress @ @ P A

Strainf

f

S


37/60

Summary

FatigueCrackingRutting

RTFOShort Term AgingNo aging

Construction

"(S"

Lo Temp

Cracking

++"

(**(**

!AV

Long Term Aging


38/60

Superpave 1inderPurchase Specification


39/60

PPer/ormanceer/ormance radesrades


40/60

P 46 P 52 P 58 P 64 P 70 P 76 P 82

?)otational =iscosit@ )=

90 90 100 100 100 110! 100 110! 110 110!

?lash 7oint@ 7

46 52 58 64 70 76 82

46 52 58 64 70 76 82

?)DLL!;> !; !LM D=;@?)DLL!;> !; !LM D=;@ )D)D Mass LossMass Loss =((L@?7)((F) A>!;> =((L@ 7A=7A=

D)!>!;ALD)!>!;AL

0 1.++ k7a

< +++ k7a

0 2.2+ k7a

( < ++ M7a m 0 +.++

)e"ort =al$e

0 1.++ ,

2+ o$rs9 2.+4 M7a

10 7 4 25 22 19 16 13 10 7 25 22 19 16 13 31 28 25 22 19 16 34 31 28 25 22 19 37 34 31 28 25 40 37 34 31

?namic (hear )heometer@ () >* sin

? Eending Eeam )heometer@ EE) G(H (tiffness I GmH- #al$e

24 30 36 0 6 12 18 24 30 36 6 12 18 24 30 0 6 12 18 24 30 0 6 12 18 24 30 0 6 12 18 24 0 6 12

18 24

24 30 36 0 6 12 18 24 30 36 6 12 18 24 30 0 6 12 18 24 30 0 6 12 18 24 30 0 6 12 18 24 0 6 12

18 24

PPer/ormanceer/ormance radesrades

?namic (hear )heometer@ () >*/sin



41/60

P 46 P 52 P 58 P 64 P 70 P 76 P 82

?)otational =iscosit@ )=

90 90 100 100 100 110! 100 110! 110 110!

?lash 7oint@ 7

46 52 58 64 70 76 82

46 52 58 64 70 76 82

?)DLL!;> !; !LM D=;@?)DLL!;> !; !LM D=;@ )D)D Mass LossMass Loss =((L@?7)((F) A>!;> =((L@ 7A=7A=

D)!>!;ALD)!>!;AL

< +++ k7a

0 2.2+ k7a

( < ++ M7a m 0 +.++

)e"ort =al$e

0 1.++ ,

2+ o$rs9 2.+4 M7a

10 7 4 25 22 19 16 13 10 7 25 22 19 16 13 31 28 25 22 19 16 34 31 28 25 22 19 37 34 31 28 25 40 37 34 31

?namic (hear )heometer@ () >* sin

? Eending Eeam )heometer@ EE) G(H (tiffness I GmH- #al$e

24 30 36 0 6 12 18 24 30 36 6 12 18 24 30 0 6 12 18 24 30 0 6 12 18 24 30 0 6 12 18 24 0 6 12

18 24

24 30 36 0 6 12 18 24 30 36 6 12 18 24 30 0 6 12 18 24 30 0 6 12 18 24 30 0 6 12 18 24 0 6 12

18 24

o# t)e P S%ec :orso# t)e P S%ec :ors




42/60

P 5822P 5822

P 5228

P 6410P 6410P 5816P 5816

< 'any agencies )aveestalis)ed zones

P +inder Selection


43/60

Summary of Ho to Use

P, Specification

& %etermine

'93day ma+ pavement temperatures

'(3day minimum pavement temperature

& Use specification ta!les to select testtemperatures

& %etermine asphalt cement propertiesand compare to specification limits


44/60

Asphalt Concrete -i+%esi#n

History

H -i A h l C


45/60

Hot -i+ Asphalt Concrete

/H-A0

-i+ %esi#ns& B!ectiveD

'%evelop an economical !lend of a##re#ates and

asphalt that meet desi#n reuirements& Historical mi+ desi#n methods

'-arshall

'Hveem

& e'Superpave #yratory


46/60

Reuirements in Common

& Sufficient asphalt to ensure a dura!le pavement

& Sufficient sta!ility under traffic loads

& Sufficient air voids

'Upper limit to prevent e+cessive environmental

dama#e

'Loer limit to allo room for initial densification due

to traffic

& Sufficient or2a!ility


47/60

MA)(ALL

M!K(!>;


48/60

-arshall -i+ %esi#n

&%eveloped !y 1ruce -arshall for the-ississippi Hi#hay %epartment in the late


49/60

-arshall -i+ %esi#n

& Select and test a##re#ate& Select and test asphalt cement

'Esta!lish mi+in# and compaction

temperatures& %evelop trial !lends

'Heat and mi+ asphalt cement anda##re#ates

'Compact specimen /()) mm diameter0


50/60

Marshall Design Criteria

Light raffic Medi$m raffic ea# raffic

(AL < 1+8 1+ 8 < (AL< 1+ (AL 0 1+3

Com"action + 4

(ta'ilit ; ?l'.@ 3 ?4+@ 5 ?12++@ 5++3 ?15++@

lo%9 +.2 mm ?+.1 in@ 5 to 15 5 to 13 5 to 18

Air =oids9 , to to to

=oids in Mineral Agg. ?=MA@ =aries %ith aggregate size


51/60

Asphalt Concrete -i+

%esi#nSuperpave

Superpave Volumetric -i+


52/60

Superpave Volumetric -i+

%esi#n

& ,oals'Compaction method hich simulates field

'Accommodates lar#e si$e a##re#ates

'-easure of compacti!ility

'A!le to use in field la!s

'Address dura!ility issues& Film thic2ness

& Environmental

i


53/60

reaction

frame

rotating

'ase

loadingram

control and data

ac&$isition "anel

mold

height

meas$rement

tilt 'ar

Key Components of Gyratory Compactor

Compaction

Compaction


54/60

Compaction& ,yratory compactor

'A+ial and shearin# action'(7) mm diameter molds

& A##re#ate si$e up to


55/60

= = mmmm

>og yrations>og yrations

1010 100100 10001000

&&iniini

&&desdes&&maxmax

Three Points on SGCCurve


56/60

S,C Critical Point Comparison

*,mm@ ,m! ,mm

,m!@ 1ul2 -i+ Specific ,ravity from compaction at

cycles

,mm@ -a+" 4heoretical Specific ,ravity

Compare to alloa!le values atD

=F= D *,mm :G*

%ESD *,mm G8*

-AID *,mm G:*


57/60

%esi#n Compaction

& des!ased on

' avera#e desi#n hi#h airtemp

' traffic level

& Lo# ma+@ ("() Lo#des

& Lo# ini@ )"67 Lo#des

= mm

>og yrations10 100 1000

&ini

&des

&max

S 4 i


58/60

Superpave 4estin#

& Specimen hei#hts

& -i+ture volumetrics

' Air voids' Voids in mineral a##re#ate /V-A0' Voids filled ith asphalt /VFA0' -i+ture density characteristics

& %ust proportion

& -oisture sensitivity


59/60

Superpave -i+ %esi#n

& %etermine mi+ properties at %esi#nand compare tocriteria

' Air voids 6* /or G8* ,mm0' V-A See ta!le

' VFA See ta!le

' *,mmat ini :G*

' *,mmat ma+ G:*

' %ust proportion )"8 to (";

i i


60/60

Superpave -i+ %esi#n

,yratory Compaction Criteria

Date post:	03-Jun-2018
Category:	Documents
Upload:	franklin-barrera
View:	238 times
Download:	0 times

Superpave Summary

Documents