Lab Manual Marshall Mix Design

UNIVEPJJII.

t9.Et!9tpg! IEIRONA'

UNIYERSIIITECSNOLOGI PETRONAS CIVIL ENGIMERING?ROGR.{MME BANDARSERT IS(ANDAR IS(ANDAR 31750TRONOE TRONOE PERAKDARULRIDZUAN

TEST 11 : MARSEALL MIX DESIGN References: B S 5 9 81: 9 8 5 ASPI{ALTINSlTruIE ASPI{ALTINSlTruIE Objectives: To introduce th th student to Marshallmix designmefhodto designbituminous mi fo paveme[t. road Equipment: l. Clralorytesring Clralorytesring machine m achine 2. Mecbaoical mixer

.r I o€rlnomelet 4. Waterbath b ath Elecnonic balaace 6. Buoya-ocy baiance Oven 8. Marshalltesting t estingmachioe GeneralDiscussion GeneralDiscussion

Th designof a bih]minous mi mi involvesth choiceofaggegateq?e, ofaggegateq?e, ag$egategiading, bitumen grade and fre deterndnatiooof bitumen content whiih will optirnise the engioeeringpropertiesin relation to the desiredbehaviourin servjce. While th importanceofthe fusl threeis threeis trotunderestioated, th majorityofdiscussioq an an research has been centredon centredon the methodsof methodsof arriving at a design bitumen cootent,wherea,sin recipespecifications thebihqen conteofis i s selected solely s olelyon th basisofexperience,In In designmethodsth th choiceofbitunetrcootent ofbitunetr cootentis basedin wboleor in pa uponth uponth results obtaioedin oueor oueor otherlaboralorytestprocedure. p rocedure.

in orderto desigla bituninousnh by laboratory procedurcs, with theaimofproducing therequbeddensityaodengineering properties, if is desinbl€lo preparespecimei:s wbich reproduce, ascloselyaspossible,thematixialtbatwilt beusedin iractici. Thepackiug characteristic-s of theaggregates significantlyinlluencethemix pripertieswhichcannor oe iusessedtromgadrngcurves,astheseassume uniformifyof particleshape,surface rougbness aadspecificgravity, Evaluationof compacted specinenstakesitrto account theseagg'egarefactors.IdearJy specimens shourdbi compacted to thesamethiclcress as usedln prachca,by rollitrg,to densitysimilal to thatattai[eduoderFaffic duringthe seryile life. However,this is not done io any cuEeotmix designprocedure,and specimeru prepared forroutinemix designsarecompacted by haron"i. ioltiog t"od" to orieotate €lotgatedan flaty aggregate particles so LbatO "ir.loogest dilreosion ar tronzoltal;tius tbespecmelstendto be moreaoisoh.opic tlan thoseprepared by ha.@Iner:

th masses.a.od th specificgravitiesof th mi componenls an th de$ify of flowing .trecorupacted m-|qth volumericcomposition ca be dererminedTb samples ar lben test€dto assess theirrelativeresistarce io deformation usingeithertn Marshill testor cleep test. Proceduret (A ; PreparatlonofAsphaltSpecimens Al marerialsare-batcbedao keptin aoovenat 150"C.Th mlxeris alsoheated ro rr sameteveto t tempemture, thereforegreatc areshouldbeexercised wheobaodliag th bo materialan equioment. 2. Th batchedgraaularmiterial Utus fillerl shouldbe placedin rb mixer and mixed or to aboutI lornute,fien l_he a pproprjate amounfo fbitumenshouldbe addedto the aggregate,Mixing shor_rld contioueuttil all particlesarecoatedwith bihrmeo. Tb materials houldalsobecompacred jn tb mm diamerer steel. oula. (*n.f, *. atsokeptar I50"C- 160,C).Aier filLingri mouldwir! tb appropriare amounror Erate.ial,theopeEtorshouldmakesurethat it is evenJydist-ibutedin ihemould. This is dooeby umpjngt-hemarerial( usirg steelr od) Ji timesa.rouud rh edgesa_od d.t.l".ga saople rerdyfor compaction using .lt Uyratory9t.:""T: festingMachinew hichis se to rhelollowi_ng standard coodirions: Axialload Algte of G',radoo No ofreyolutioos

30

When tbe specimens hayecooleddo*! to room tenperatue, theyarc extrudedh.orl *g$e, Tb weightofeacbspecimeo i n air ard wateran it heightrnootaU" F: taketr(l'or d€nsjtycalculatioDs ). Tbreespeciuensareto bepreparedfor eachbitumeDconteat.

Conect tle stability value obtaioedabove (in order to take into accountthe dineasions ofthesample) by th appropriate coeffcienl Readalsothedeformation at fadur€. Fromlbedat&plot thefollowingrelationships: Delsity vs.bihmen contetrt Stabilityys.bitumetrcontetrt Porcsityys.bihmeDcotrtent Flowys bitumen c onaent 8. Io ihe light of the dataobhined nake cornments regardingthe suitabilityof asphalt mltes for usein roadsurfacines.

Volumeof

Coefficie!tF actor

200-2t3 214-225 226-237 238-250 265-276 277-289 290-301 302-316 31',7,328 329-340 341-353 354-357 368-379 380-392 393-105 406420 42r431 432-443 44+456 15',7 4'10 471-482 483495 496-508 509-522 523-535 536-546 54'.7-559 560-573 57,{-585 586-598 599-610 6tt-625

Jor Ad Stabili Yalues, Thickless CorrectiolrC oefficieDt 2.54 2.70 2.86 3.02 3.18 3.49 3.65 3.81 3.97 4.r3 4.29 4.45 4.60 1.',7 4.92 5.08 5,10 5.56 5.72 5.88 6.03 6.19 6.t5 6.51 6.67 6.99

7.t4

'1.62

5.56 5.00 4.55 3.85 3.51 3.33 3.03

i.

2.50 2.21 2.08 1.92 I.'/9 1.67 1.56 1.39 1.32 t.25 1.19 1.14 1,09 1.0,1 1.00 0.96 0.93 0.89 0.86

0.83 0.81 0.78 0.76