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