January 2019—Volume 2—Issue 8 Professional Construction...

transcript

January2019—Volume2—Issue8

GeneralDanielMorgan,hero

oftheBattleofCowpens

(whichtookplaceonJanuary

17th,1781)hasastatueand

squarededicatedinhishonor

inSpartanburg?Thestatueis

30feettallandfacestowards

CowpensNationalBattle)ield.

UpcomingEvents

Jan.17@6P.M.

ChapterMeeting

Feb.21@6P.M.

ChapterMeeting

Feb.22@10A.M.

Natl.BoardMeeting

Mar.21@6P.M.

ChapterMeeting

Didyouknow?

MessagefromthePresident:

DearPCEAfamily,

TheNewYeariscauseforcele-

bration,forspendingtimewith

friendsandfamily,andforlooking

back.Alotcanhappeninayearand

betweenthegood,thebadandthe

ugly,thismayseemlikeanunder-

statementformostofus.Asglasses

areraisedand)ireworksexplodeinto

thesky,it’simportanttorecognizethespecialsymbol-

ismthisholidaybringswithit.Atimeofnewbegin-

ningsandfreshstartsalsocomeswithatimeofre)lec-

tion.Whetheryourresolutioniskeepingyourhands

outofthecookiejarorgivingyourallatwork,itcan

takecommitment.Anditcanmakeallthedifferenceto

putthesehopesintowordsandwriteyourgoalsdown

onpaper.Asachapter,weaccomplishedseveralofthe

goalswesetforourselvesearlierthisyear.Asweenter

into2019Isincerelyhopewecanexpandonthose

goalsandaccomplishmoreandcontinuetosetmore

goalsaswegrow.Ilookforwardtoseeingyouallat

ournextmeetingandIwishyouallthebestin2019!

BenWeeks

ChapterPresident

ProfessionalConstructionEstimators

AssociationofAmericaUpstateChapter23

—MeetingInfo;NewMembers

—ConstructionbeginsonspecbuildinginSpar-

tanburg

—WhatHappensWhenConcreteFreezes

—DecemberChristmasPartyPhotos

—PCEAUpstateChapter#23Members

InsideThisIssue

2019ConventionInformationMonthlyMeeting

Ournextmonthlychapter

meetingwillbeheldon

January17that6:00P.M.at

theAugustaGrill,locatedat

1818AugustaStreet

Greenville,S.C.

Pleaseregisteronlineat

https://tinyurl.com/

yaaudyhg

Markyourcalendarsforthe2019PCEA

NationalConventioninOrlando,Florida!

Dates:May1st-5th,2019

Location:LoewsSapphireFallsResort

—ProfessionalConstructionEstimatorsAssociationofAmerica—

—UpstateChapter#23—MonthlyNewsletterVolume2,Issue8—January2019

WelcomeNewMembers!

Name:DaveSmith

Company:SignaramaAnderson

Position:Owner

WhyDidYouJoinPCEA?

Wedoalotofworkforcommercialcontractors–the

PCEAseemedlikeagreatplacetonetworkandmeet

newcontacts.

JanuaryPresentationTopic

Thismonth,PCEACatawbaValleyChapterMemberAndrewRudisillwith

BuildingPointSouthEastwillpresentonthefollowingtopic:

Trimble-Leveraging3DModelQuantitiestoDriveEstimatingEf@iciency

"Awork�lowfocusedon�lexibilityandaccuracy"

Youwon’twanttomissthis!

ConstructionbeginsonspecbuildinginSpartanburg

BytheStaff—UpstateBusinessJournal—Dec12,2018

Dallas-basedCourtlandDevelopmentrecentlyannouncedthatithaspurchased

morethan100acresoflandonFortPrinceRoadinSpartanburgtoconstructaspeculative

building.TheFt.PrinceCommerceCenterwillconsistsoftwosites—Ft.PrinceCom-

merceOneandFt.PrinceCommerceTwo,accordingtoanewsrelease.CommerceOneis

currentlyundergoing

siteworkinprepara-

tionfora436,800-

square-footcross-dock

building,whichisex-

pectedtobe)inished

inAugust2019,the

releasesaid.

CommerceTwo

isa399,000-square-

footbuildingsiteavail-

ableforbuild-to-suit

projects.Financialde-

tailsoftheproject

werenotdisclosed,butCourtlandDevelopmentsaidtheadditionoftheFt.PrinceCom-

merceCenterisexpectedtoattractcompanieswithdistribution,third-partylogistics,au-

tomotive,andadvanced-manufacturingneedswithintherapidlyexpandingindustrialcor-

ridorinSpartanburg.

“WehavebeenverymeticulousintheplanningofFortPrinceCommerceCenter—

takingintoaccountthedemanddriversandindustrialusersneedwithintheI-85Spartan-

burgmarket,”saidJonNapper,CourtlandDevelopmentmanagingpartner,intherelease.

“ThislocationprovidesunobstructedaccesstoBMWandtheInlandPortinGreer,aswell

as95millionpeoplewithinaneight-hourdrive.”

ColliersInternationalisrepresentingCourtlandintheleasingofbothbuildingsat

CommerceCenter.JDIRealtyisapartnerwithCourtland,andconstruction)inancingwas

providedbyCrossHarborDebtFund.ConstructionisbeingmanagedbyHarperGeneral

Contractors.

Formoreinformation,visithttps://bit.ly/2r9SGWC.

WhatHappensWhenConcreteFreezes?

BythePortlandCementAssociation—

https://www.cement.org/learn/concrete-technology/concrete-construction/cold-

weather-concreting

Weatherconditionsatajobsite–hotor

cold,windyorcalm,dryorhumid–maybevastly

differentfromtheoptimumconditionsassumedat

thetimeaconcretemixisspeci)ied,designed,or

selected–orfromlaboratoryconditionsinwhich

concretespecimensarestoredandtested.Con-

cretecanbeplacedincoldweatherconditions

providedadequateprecautionsaretakentoallevi-

atethenegativeimpactsoflowambienttempera-

tures.ThecurrentAmericanConcreteInstitute

(ACI)de)initionofcold-weatherconcreting,asstatedinACI306is,“aperiodwhenfor

morethanthreesuccessivedaystheaveragedailyairtemperaturedropsbelow40de-

greesFahrenheitandstaysbelow50degreesFahrenheitformorethanone-halfofany24

hourperiod.”Thisde)initioncanpotentiallyleadtoproblemswithfreezingoftheconcrete

atanearlyage.

Allconcretemustbeprotectedfromfreezinguntilithasreachedaminimum

strengthof500poundspersquareinch(psi),whichtypicallyhappenswithinthe)irst24

hours.Ifconcretefreezeswhileitisstillfreshorbeforeithasdevelopedsuf)icient

strengthtoresisttheexpansiveforcesassociatedwiththefreezingwater,iceformation

resultsinthedisruptionofthecementpastematrixcausinganirreparablelossin

strength.Earlyfreezingcanresultinareductionofupto50percentintheultimate

strength.Onceconcretehasattainedacompressivestrengthofaround500psi,itisgener-

allyconsideredtohavesuf)icientstrengthtoresistsigni)icantexpansionanddamageif

frozen.Wheneverairtemperatureatthetimeofconcreteplacementisbelow40degrees

Fahrenheitandfreezingtemperatureswithinthe)irst24hoursafterplacementareex-

pected,thefollowinggeneralissuesshouldbeconsidered:

Initialconcretetemperatureasdelivered

Duringcoldweather,itmaybenecessarytoheatoneormoreoftheconcretemate-

rials(waterand/oraggregates)toprovidetheproperconcretetemperatureasdelivered.

Duetothequantitiesandheatcapacityofcement,usinghotcementisnotaneffective

methodinraisingtheinitialconcretetemperature.

Protectionwhiletheconcreteisplaced,consolidated,and@inished

Theexposureofconcretetocoldweatherwillextendthetimerequiredforitto

reachinitialset,whichmayrequire)inishingcrewstobeavailableforalongerperiod.De-

pendingontheactualambienttemperature,protectionofaconcreteplacementmayre-

quiretheuseofwindbreaks,enclosures,orsupplementaryheat.Itmayalsobeappropri-

atetoadjusttheconcretemixtureconstituentsfortheeffectofambienttemperatureon

settingtime.Thismayrequireanincreaseincementcontent,theuseofanaccelerating

chemicaladmixture,orboth.

Windbreaksprotecttheconcreteandconstruction

personnelfrombitingwindsthatcausetemperaturedrops

andexcessiveevaporation.Typically,aheightofsixfeetis

suf)icient.Windbreakscouldbetallerorshorterdepend-

ingonanticipatedwindvelocities,ambienttemperatures,

relativehumidity,andconcreteplacementtemperatures.

Heatedenclosuresareveryeffectiveforprotecting

concreteincoldweather,butareprobablythemostex-

pensiveoption.Enclosurescanbemadeofwood,canvas

tarpaulins,orpolyethylene.Prefabricatedrigid-plasticen-

closuresarealsoavailable.

Threetypesofheatersareusedincold-weather

concreteconstruction:direct)ired,indirect)ired,andhy-

dronicsystems.Toavoidcarbonationoffreshconcrete

surfaces,indirect-)iredheatersshouldbeused.Iftheconcreteisnotexposedtotheheater

orexhaustdirectly,thenadirect-)iredheaterissuitable.Cautionshouldbetakentoen-

surethatworkersarenotoverexposedtocarbonmonoxideanytimeaheaterisusedin-

sideanenclosure.Hydronicsystemstransferheatbycirculatingaglycol/watersolutionin

aclosedsystemofpipesorhoses.Typicalapplicationsforhydronicsystemsincludethaw-

ingandpreheatingsubgradesandheatingareasthataretoolargetobepracticalforan

enclosure.

Curingtoproducequalityconcrete

Curingnotonlyrequiresadequatemoisture,butalsoappropriatetemperature.The

temperatureoftheconcreteasplacedshouldbeabove40degreesFahrenheitusingmeth-

odsdescribedabove,howeverthedurationofheatingisdependentonthetypeofservice

fortheconcrete,rangingfromonedayforhigh-earlystrengthconcretethatisnotexposed

tofreeze-thaweventsduringserviceto20daysormoreforaconcreteelementthatwould

carrylargeloadsatanearlyage.Instructuresthatwillcarrylargeloadsatanearlyage,

concretemustbemaintainedataminimumof50degreesFahrenheittoaccommodate

strippingofformsandshoringandtopermitloadingofthestructure.

Innocaseshouldconcretebeallowedtofreezeduringthe)irst24hoursafterit

hasbeenplaced.Sincecementhydrationisanexothermicreaction,theconcretemixture

producessomeheatonitsown.Protectingthatheatfromescapingthesystemusingpoly-

ethylenesheetingorinsulatingblanketsmaybeallthatisrequiredforgoodconcrete

quality.Moreseveretemperaturesmayrequiresupplementalheat.

Concreteretainedinformsorcoveredwithinsulationseldomlosesenoughmois-

tureat40to55degreesFahrenheit)toimpaircuring.However,dryingfromlowwinter-

timehumiditiesandheaters

usedinenclosuresisaconcern.

Itisgoodpracticetoleaveforms

inplaceaslongaspossible,be-

causetheyhelpdistributeheat

moreevenlyandhelpprevent

dryingoftheconcrete.Live

steamexhaustedintoanenclo-

surearoundtheconcreteisan

excellentmethodofcuringbe-

causeitprovidesbothheatand

moisture.Liquidmembrane-

formingcompoundscanalsobe

usedwithinheatedenclosures

forearlycuringofconcretesurfaces.

Itisalsoimportanttopreventrapidcoolingoftheconcreteuponterminationof

theheatingperiod.Suddencoolingoftheconcretesurfacewhiletheinterioriswarmmay

causethermalcracking.Methodsforgradualcoolingofconcreteincludelooseningthe

formswhilemaintainingcoverwithplasticsheetingorinsulation,gradualdecreasein

heatinginsideanenclosure,orturningofftheheatandallowingtheenclosuretoslowly

equilibratetoambienttemperature.Massivestructuresmayrequireseveraldaysoreven

weeksofgradualcoolingtomitigatetheprobabilityofthermalcracking.

PCEAUpstateChapter#232018ChristmasParty

UpstateChapter#23PresidentBenWeeks(right)presents

thePastPresident’sAwardtoRichBartels(left)

PCEAisBuiltOntheStrengthofOurMembersandTheirEmployers!

TheUpstateChapterAppreciatesOurNationalSponsors

January 2019—Volume 2—Issue 8 Professional Construction...

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