Item 410 Concrete Structures.docx

Item 410 Concrete Structures.docx

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Item410ConcreteStructures

ItemNo.410S

ConcreteStructures

410S.1Description

Thisitemshallgoverntheconstructionofalltypesofstructuresinvolvingtheuseofstructuralconcrete,exceptwheretherequirementsarewaivedorrevisedbyothergoverningspecifications.

Allconcretestructuresshallbeconstructedinaccordancewiththedesignrequirementsanddetailsindicatedonthedrawings,inconformitywiththepertinentprovisionsoftheitemscontractedfor,theincidentalitemsreferredtoandinconformitywiththerequirementsherein.

Thisspecificationisapplicableforprojectsorworkinvolvingeitherinch-poundorSIunits.Withinthetextandaccompanyingtables,theinch-poundunitsaregivenpreferencefollowedbySIunitsshownwithinparentheses.

410S.2Submittals

Thesubmittalrequirementsofthisspecificationitemmayinclude:

Appropriatemixdesignsforclassofconcreteforeachtypeofstructureorunit;

Appropriatemortarandgroutmixdesigns;

Productname,description,technicalinformationandsupplierofanyacrylic-polymerlatexadmixture;

Type,supplierandcertifiedtestresultsforexpansionjointmaterials;

TypeofwaterstopandconfirmationthattheproductconformstoTxDoTDMS-6160;

TypeandmanufacturerofproposedevaporationretardantandconfirmationthatitmeetstherequirementsoftestresultsforTxDoTDMS-4650;

TypeandmanufacturerofproposedchemicaladmixturesandconfirmationthatitmeetstherequirementsoftestresultsforTxDoTDMS-4640;

TypeandmanufacturerofproposedcuringadmixturesandconfirmationthatitmeetstherequirementsoftestresultsforTxDoTDMS-4640;

TypeandmanufacturerofproposedchemicaladmixturesandconfirmationthatitmeetstherequirementsoftestresultsforTxDoTDMS-4640;

Typeandmanufacturerofproposedepoxyand/oradhesivesandconfirmationthatitmeetstherequirementsoftestresultsforTxDoTDMS-6100;

ReinforcingsteelshallconformtoStandardSpecificationItemNo.406S,“ReinforcingSteel”.

Contractorsformworkplanforplacingandconsolidatingconcretearoundwallpenetrationsandatlocationsdesignatedashavingcongestedreinforcingsteel.

410S.3Materials

A.Concrete

ConcreteshallconformtoItemNo.403S,"ConcreteforStructures".

Theclassofconcreteforeachtypeofstructureorunitshallbeasindicatedonthedrawingsorbypertinentgoverningspecifications.

B.GroutorMortar

Whenrequiredorshownonthedrawings,mortarandgroutconsistingof1parthydrauliccementand2partssandwithsufficientwatertoprovidethedesiredconsistencyshallbeprovided.Mortarshallbeprovidedwithaconsistencythatcanbehandledeasilyandspreadbyatrowel.Groutshallbeprovidedwithaconsistencythatwillflowintoandcompletelyfillallvoids.

C.Latex

Whenrequiredanacrylic-polymerlatexadmixture（acrylicresinemulsioninaccordancewithTxDoTDMS-4640,“ChemicalAdmixturesforConcrete”）suitableforproducingpolymer-modifiedconcreteormortarshallbeprovided.Thelatexshallnotbeallowedtofreeze.

Thefollowinginformationshallbesubmittedforlatex:

Nameandinformationofcompanycontactpersonnel,

Productnameandpolymerdescription,and

Thelatexshallmeetthefollowingrequirements.

Table1:

LATEXADDITIVEREQUIREMENTS

Property

Value

TotalSolids,minimum,percent

47

PH

9.0to11.0

Brookfieldviscosity（#1spindle@10rpm）,mPas,maximum

60

ButadieneContent,percent

30to40

Freeze-thawstability,2cycles.maximum

0.1

Specificationtargetsandproductiontolerancesshallalsobeprovidedforthefollowingproperties.

1.viscosity（includingtestmethodandtemperaturereference）,

2.percentsolids,

3.pH,

4.specificgravity,and

5.styrene/butadieneratio.

D.ReinforcingSteel

ReinforcingsteelshallconformtoStandardSpecificationItemNo.406S,“ReinforcingSteel”.

E.ExpansionJointMaterial

TheexpansionjointmaterialshallconformtotherequirementsofTxDoTDMS-6310,“JointMaterialsandFillers”.

1.PreformedFiberSheets

Unlessotherwiseindicatedonthedrawingspreformedbituminousfibermaterialshallbeprovided.Thepreformedfibermaterialshallconformtothedimensionsindicatedonthedrawings.PreformedfibersheetsshallmeettherequirementsofASTMD-1751,“PreformedExpansionJointFillerforConcretePavingandStructuralConstruction（NonextrudingandResilientBituminousTypes）.Therequirementsrelatedtobitumencontent,densityandwaterabsorptionshallnotapplytononbituminousmaterials.

2.JointSealingMaterial

UnlessotherwiseindicatedonthedrawingsaClass4,5or7low-modulussiliconesealantshallbeprovidedthatconformstotherequirementsofTxDoTDMS-6310,“JointSealantsandFillers”.

3.TimberBoards

Timberboardsshallbemadefromredwoodorcypressandmustbefreefromsapwood,knots,clusteredbird’seye,checksandsplits.Whenovendriedat230oF（110oC）toaconstantweight（mass）,thedensityoftheboardshallbebetween20and35lbs.Percubicfoot（between320and560kgspercubicmeter）

4.AsphaltBoard

AsphaltBoardshallconformtothedimensionsindicatedonthedrawingsandshallmeetthedescription,generalrequirementsanddistortiontestingofASTMD-994,“PreformedExpansionJointFillerforConcrete（bituminousType）”.

5.RebondedNeopreneFillerSheet

Rebondedneoprenefillershallconsistofgroundclosedcellneopreneparticles,rebondedandmoldedintosheetsofuniformthicknessofthedimensionsindicatedonthedrawings.ThesesheetsshallmeettherequirementsofASTMD-1752,TypeI.

ThemanufacturershallfurnishtheEngineerordesignatedrepresentativewithcertifiedtestresultsastothecompliancewiththeaboverequirements.

F.Waterstop

Unlessotherwiseindicatedonthedrawings,rubberwaterstopsorPolyvinylChloride（PVC）waterstopsthatconformtoTxDoTDMS-6160,“Waterstops,NylonReinforcedNeopreneSheet,andElastomericPads”shallbeprovided.

G.EvaporationRetardants

EvaporationretardantsshallconformtotherequirementsofTxDoTDMS-4650,“HydraulicCementConcreteCuringMaterialsandEvaporationRetardants”.Theevaporationretardantmustbeacommerciallyavailablemonomolecularfilmcompound.Theevaporationretardantshallhavenoadverseeffectonthecementhydrationprocessortheconcreteandshallreducesurfacemoistureevaporationfromtheconcretewhenperformingconcreteoperationsindirectsun,wind,hightemperatures,orlowrelativehumidity.Theproduceroftheevaporationretardantshallcertifythatitmeetsthesespecifiedrequirements.

H.CuringMaterials

1.LiquidMembraneFormingcompounds

LiquidMembraneFormingcompoundsshallconformtotherequirementsofTxDoTDMS-4650,“HydraulicCementConcreteCuringMaterialsandEvaporationRetardants”.Thecompoundshallbeappliedtodampconcreteasafinemistthroughatomizingnozzlesatawetfilmthicknessof8to9mils（200to230µm）.Theliquidmembrane-formingcompoundmustnotreactdeleteriouslywithconcreteoritscomponents.Itmustproduceafirm,continuous,uniformmoisture-impermeablefilmthatisfreeofpinholes,cracks,orotherfilmdefects.Itmustalsoexhibitsatisfactoryadhesion.

Theconsistencymustbesuchthatthecompoundcanbeappliedsatisfactorilybyconventionalorairlesssprayatatmosphericandmaterialtemperaturesabove40oF（5oC）withoutthinning.Whenappliedatthemanufacturer'srecommendedthickness,notlessthan8mils（200µm）wet,toverticalsurfacesofdampconcrete,thecompoundmustnotrunofforappreciablysag.Theliquidmembrane-formingcompoundmustnotdisintegrate,check,peel,orcrackduringtherequiredcuringperiod.Itmustnotpeelorpickupundertraffic,andmustdisappearfromthesurfaceofthecuredconcretebygradualdisintegration.

2.CottonMats

Cottonmatsshallconsistofafillingmaterialofcotton“bat”or“bats”[atleast12oz.Persquareyard（400gramspersquaremeter）]completelycoveredwithunsizedcloth[atleast6oz.Persquareyard（200gramspersquaremeter）]stitchedlongitudinallywithcontinuousparallelrowsofstitchingspacedatlessthan4in.（100mm）,ortuftbothlongitudinallyandtransverselyatintervalslessthan3in.（75mm）.

Thecottonmatsshallbefreefromtearsandingoodgeneralcondition.Aflapatleast6in.（150mm）widewithtwo

（2）thicknessesofthecoveringthatextendsalongonesideofthematshallbeprovided.

3.PolyethyleneSheeting

Thepolyethylenesheetingshallbeatleast4milsthick（0.1mm）andfreefromvisibledefects.Clearoropaquewhitesheetingshallbeprovidedwhentheambienttemperatureduringcuringexceeds60oF（15oC）orwhenapplicabletocontroltemperatureduringmasspours.

4.Burlap-PolyethyleneMats

Theburlap-polyethylenematsshallbemadefromburlapimpregnatedon1sidewithafilmofopaquewhite-pigmentedpolyethylene,freefromvisibledefects.Thelaminatedmatsshallhaveatleast1layerofanimperviousmaterialsuchaspolyethylene,vinylplastic,orotheracceptablematerial（eitherasasolidsheetorimpregnatedintoanotherfabric）andshallbefreeofvisibledefects.

I.ChemicalAdmixtures

Chemicaladmixturesincludingwaterreducing,placticizersandairentrainmentshallconformtoTxDoTDMS-4640,“ChemicalAdmixturesforConcrete”Calciumchlorideshallnotbeused.AdmixturesshallbeincludedintheprequalifiedconcreteadmixtureslistmaintainedbyTxDot’sConstructionDivision.

J.CityofAustinSurveyMonuments

ThePublicWorksDepartmentmayfurnishpermanentsurveymonumentstobecastinconcreteasindicatedonthedrawingsorasdirectedbytheEngineerordesignatedrepresentative.

K.Epoxy

Unlessindicatedotherwiseonthedrawings,epoxymaterialsshallconformtoTxDoTDMS-6100,“E