Designation:C642−13StandardTestMethodforDensity,Absorption,andVoidsinHardenedConcrete1ThisstandardisissuedunderthefixeddesignationC642;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationsofdensity,percentabsorption,andpercentvoidsinhardenedconcrete.1.2Thetextofthistestmethodreferencesnotesandfootnoteswhichprovideexplanatoryinformation.Thesenotesandfootnotes(excludingthoseintablesandfigures)shallnotbeconsideredasrequirementsofthisstandard.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.SignificanceandUse2.1Thistestmethodisusefulindevelopingthedatarequiredforconversionsbetweenmassandvolumeforcon-crete.Itcanbeusedtodetermineconformancewithspecifica-tionsforconcreteandtoshowdifferencesfromplacetoplacewithinamassofconcrete.3.Apparatus3.1Balance,sensitiveto0.025%ofthemassofthespecimen.3.2Container,suitableforimmersingthespecimenandsuitablewireforsuspendingthespecimeninwater.4.TestSpecimen4.1Wheneverpossible,thesampleshallconsistofseveralindividualportionsofconcrete,eachtobetestedseparately.Theindividualportionsmaybepiecesofcylinders,cores,orbeamsofanydesiredshapeorsize,exceptthatthevolumeofeachportionshallbenotlessthan350cm3(orfornormalweightconcrete,approximately800g);andeachportionshallbefreefromobservablecracks,fissures,orshatterededges.5.Procedure5.1Oven-DryMass—Determinethemassoftheportions,anddryinanovenatatemperatureof11065°Cfornotlessthan24h.Afterremovingeachspecimenfromtheoven,allowittocoolindryair(preferablyinadesiccator)toatemperatureof20to25°Canddeterminethe...
