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ASPHALT INSTITUTEwww.ohmpa.org

SMA MixtureDesign Requirements

Alexander W. (Sandy) Brown, P.Eng.ntario !ot Mix Produ"ers Asso"iation # $e"%ni"al Dire"tor

As&%alt 'nstitute # anadian ield Engineer

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November 2006 2

*er*iew

'ntrodu"tion

W%at is SMA+

Mixture Pro&erties Mix Produ"tion

A&&li"ations or SMA

SMA on"erns

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November 2006 3

De-nitions

Stone Masti" As&%alt (SMA) is %ot mix

as&%alt "onsisting o two &arts/ a "oarseaggregate s0eleton and an as&%alt 1inderri"% mortar. $%e mixture %as an aggregates0eleton wit% "oarse aggregate stone#on#

stone "onta"t.2

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November 2006 4

De-nitions

Stone Masti" As&%alt (SMA) Mortar means a

mixture o as&%alt "ement (and anyadditi*es), -ller (all material &assing t%e34 5m sie*e rom t%e dry sie*ing o allaggregate "om&onents in"luding any

"ommer"ial -ller) and -1res 1lended 1y*olume.2

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Stone Masti" As&%alt (SMA)

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November 2006 6

'ntrodu"tion

W%at is Stone Masti" As&%alt (SMA)+ SMA is a ga& graded rut resistant

%ot mix as&%alt Mix is "om&osed o6

!ig% 7uality Aggregates

As&%alt Ri"% Mortar

Mineral iller

ellulose i1res

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November 2006 7

'ntrodu"tion

8ey Bene-ts o SMA Rut Resistant Mix

9ery !ig% S0id Resistan"e Redu"ed Water S&ray

:oise Redu"tion

Dura1le Mix

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November 2006 8

Mixture Pro&erties

;o*erning S&e"i-"ations

AAS!$ MP Standard S&e"i-"ation or Designing StoneMatrix As&%alt (SMA)

M$ PSS >>4> (:o*. ?==@)Material S&e"i-"ation or Su&er&a*e and StoneMasti" As&%alt Mixtures

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November 2006 9

Mixture Pro&erties

ntario Mix Design Pro"edures ' erti-ed $y&e AC or AMR or equi*alent

"erti-ed la1oratory @ &oint mix design

Su&er&a*e ;yratory om&a"tor (S;)

:designo >== gyrations

Detailed mix design su1missiono1 Mix ormula (M)

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;radation En*elo&e

Sieve SMA 12.5 mm SP 12.5 mm FC1

19.0 mm 100 100

12.5 mm 90 99 90 100

9.5 mm 50 85

4.75 mm 28 40 45 60

2.36 mm 16 28 28 58

75 5m 8 11 2 10

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Mix Pro&erties

Design Parameter Design Criteria

Air 9oids @.=

9oids in MineralAggregate, 9MA

>3 Minimum

9Amix ess t%an 9A DR

$ensile Strengt% Ratio

3= Minimum

Draindown =.F Maximum

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Air 9oids

a1oratory "om&a"tion 1y use oSu&er&a*e ;yratory om&a"tor (S;)

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November 2006 13

9oids in oarse

Aggregate o Mix, 9A M'G S&e"i-"ation6 ess t%an 9A DR( 9A M'G6 $%e *olume in 1etween t%e

"oarse aggregate &arti"les. $%is *olumein"ludes -ller, -ne aggregate, air *oids,as&%alt 1inder, and -1re.

9A DR(6 $%e *olume in 1etween t%e

"oarse aggregate &arti"les o t%e -nalHo1 mix ormula in a dry rodded"ondition.

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November 2006 14

9oids in oarse Aggregate o

Mix, 9A M'G 9A M'GIJ 9A DR( to gi*e t%e SMA Stone

on Stone onta"t

$%is allows t%e "oarse aggregate s0eleton

to transer t%e traK" loads

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November 2006 15

$ensile Strengt% Ratio, $SR

S&e"i-"ation6 3= Minimum

%e"0s t%e moisture sus"e&ti1ility o t%e

as&%alt mixture $wo a""e&ta1le test &ro"edures6

$ensile Strengt% Ratio, AAS!$ $?

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$ensile Strengt% Ratio, $SR

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November 2006 17

Draindown

S&e"i-"ation6 =.F Maximum

$ested at &rodu"tion tem&erature o

as&%alt mixture or > %our Mass o as&%alt mortar t%at %as drained

rom total as&%alt mass is determined andex&ressed as &er"ent o total mass o t%eoriginal sam&le

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Draindown

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November 2006 19

As&%alt Mortar

As&%alt ement, Mineral iller, i1res

Pro*ides "oating o "oarse aggregate

s0eleton to6 Prote"t rom moisture and en*ironment

Bind t%e aggregate &arti"les toget%er

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November 2006 20

Mix Produ"tion

SMA "an 1e &rodu"ed in eit%er 1at"% ordrum &lants

$%e &rodu"tion o SMA is 1etter geared tolarge tonnage &roHe"ts

onsistent aggregate gradations are"riti"al or SMA &rodu"tion Bailey met%od L ? "%ange in PS results in

> "%ange in *oids

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November 2006 21

Mix Produ"tion

Produ"tion rates o SMA are 1ased on &lantlayout6 ? "old eed 1ins or A, > or A Mineral -ller will need to 1e im&orted A "ontent is %ig% L s"%edule deli*eries to

0ee& u& wit% &rodu"tion Met%od o -1re addition

Bagged -1res 1y %and Air 1lown -1res Pelletied -1res

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i1re Addition 1y !and

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November 2006 23

A&&li"ations or SMA

M$ Dire"ti*e P!N##=>O, $%e se o

Sura"e ourse $y&es on Pro*in"ial

!ig%ways, uly ?==?

SMA is warranted w%en6

ESAS Q design lane Q year ex"eeds F million

D or SP >?.4 ? is or > to F million

Some Muni"i&alities use SMA

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November 2006 24

on"erns

Dura1ility o "oarse aggregate A a1rasion I F= +

May 1e too %ig% or some 1rittle aggregate 9MA "olla&se

Bridging o*er o *oids A "ontent too %ig%

ow initial s0id resistan"e

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Stone Masti" As&%alt (SMA)

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Stone Masti" As&%alt (SMA)

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