Designation:D4718/D4718M−15StandardPracticeforCorrectionofUnitWeightandWaterContentforSoilsContainingOversizeParticles1ThisstandardisissuedunderthefixeddesignationD4718/D4718M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thispracticepresentsaprocedureforcalculatingtheunitweightsandwatercontentsofsoilscontainingoversizeparticleswhenthedataareknownforthesoilfractionwiththeoversizeparticlesremoved.1.2Thispracticealsocanbeusedtocalculatetheunitweightsandwatercontentsofsoilfractionswhenthedataareknownforthetotalsoilsamplecontainingoversizeparticles.1.3Thispracticeisbasedontestsperformedonsoilsandsoil-rockmixturesinwhichtheportionconsideredoversizeisthatfractionofthematerialretainedonthe4.75-mm[No.4]sieve.Basedonthesetests,thispracticeisapplicabletosoilsandsoil-rockmixturesinwhichupto40%ofthematerialisretainedonthe4.75-mm[No.4]sieve.Thepracticealsoisconsideredvalidwhentheoversizefractionisthatportionretainedonsomeothersieve,butthelimitingpercentageofoversizeparticlesforwhichthecorrectionisvalidmaybelower.However,thepracticeisconsideredvalidformaterialshavingupto30%oversizeparticleswhentheoversizefractionisthatportionretainedonthe19-mm[3⁄4-in.]sieve.1.4Thefactorcontrollingthemaximumpermissibleper-centageofoversizeparticlesiswhetherinterferencebetweentheoversizeparticlesaffectstheunitweightofthefinerfraction.Forsomegradations,thisinterferencemaybegintooccuratlowerpercentagesofoversizeparticles,sothelimitingpercentagemustbelowerforthesematerialstoavoidinaccu-raciesinthecomputedcorrection.Thepersonoragencyusingthispracticeshalldeterminewhetheralowerpercentageistobeused.1.5Thispracticemaybeappliedtosoilswithanypercent-ageofoversizeparticlessubjecttothelimitationsgivenin1.3and1.4.How...
