Designation:D5858−96(Reapproved2020)StandardGuideforCalculatingInSituEquivalentElasticModuliofPavementMaterialsUsingLayeredElasticTheory1ThisstandardisissuedunderthefixeddesignationD5858;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoverstheconceptsforcalculatingtheinsituequivalentlayerelasticmodulicanbeusedforpavementevaluation,rehabilitation,andoverlaydesign.Theresultingequivalentelasticmodulicalculatedfromthedeflectiondataaremethod-dependentandrepresentthestiffnessesofthelayersunderaspecificnondestructivedeflectiontesting(NDT)deviceatthatparticulartestloadandfrequency,temperature,andotherenvironmentalandsite-specificconditions.Adjust-mentsfordesignload,referencetemperature,andotherdesign-relatedfactorsarenotcoveredinthisguide.Theintentofthisguideisnottorecommendonespecificmethod,buttooutlinethegeneralapproachforestimatingtheinsituelasticmoduliofpavementlayers.1.2Thisguideisapplicabletoflexiblepavementsandinsomecases,rigidpavements(thatis,interiorslabloading),butisrestrictedtotheuseoflayeredelastictheory2astheanalysismethod.Itshouldbenotedthatthevariousavailablelayeredelasticcomputermodelingtechniquesusedifferentassump-tionsandalgorithmsandthatresultsmayvarysignificantly.Otheranalysisprocedures,suchasfiniteelementmodeling,maybeused,butmodificationstotheprocedurearerequired.NOTE1—Ifotheranalysismethodsaredesired,thereportlistedinFootnote3canprovidesomeguidance.1.3Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesan...
