ASTM_C_1792_-_14.pdf

Designation:C179214Standard Test Method forMeasurement of Mass Loss versus Time for One-Dimensional Drying of Saturated Concretes1This standard is issued under the fixed designation C1792;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method determines the mass loss over time dueto one-dimensional drying and moisture transport in an initiallysaturated cylindrical specimen with both ends exposed toconstant temperature and relative humidity.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C31/C31M Practice for Making and Curing Concrete TestSpecimens in the FieldC42/C42M Test Method for Obtaining and Testing DrilledCores and Sawed Beams of ConcreteC125 Terminology Relating to Concrete and Concrete Ag-gregatesC157/C157M Test Method for Length Change of HardenedHydraulic-Cement Mortar and ConcreteC192/C192M Practice for Making and Curing Concrete TestSpecimens in the LaboratoryC511 Specification for Mixing Rooms,Moist Cabinets,Moist Rooms,and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC1005 Specification for Reference Masses and Devices forDetermining Mass and Volume for Use in the PhysicalTesting of Hydraulic CementsE104 Practice for Maintaining Constant Relative Humidityby Means of Aqueous Solutions3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminology C125.4.Summary of Test Method4.1 Saturated cylindrical concrete specimens with sealedsides are prepared and the two ends are exposed to anenvironment at 23C and 50%relative humidity(RH),subjecting the specimen to one-dimensional drying.Theirmasses are measured periodically to establish a data set ofaverage mass loss versus time.5.Significance and Use5.1 Drying behavior is related to the mass transport proper-ties of concrete,such as liquid permeability and water diffu-sivity.It depends on a number of factors such as concretemixture proportions,presence of admixtures and supplemen-tary cementitious materials,composition and physical charac-teristics of the aggregates and cementitious materials,curingconditions,degree of hydration,and presence of microcrack-ing.Drying behavior is also affected strongly by the degree ofsaturation and temperature of the concrete at the start of dryingas well as the environmental conditions that exist during dryingsuch as temperature,relative humidity,and air flow rate(windspeed).5.2 This test method subjects initially saturated specimensof concrete to one-dimensional drying under controlled envi-ronmental conditions.The resulting mass loss versus time datacan be used to estimate transport coefficients including liquidpermeability3and water diffusivity.4These coefficients may be1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.66 on Concretes Resistance to Fluid Penetration.Current edition approved July 1,2014.Published July 2014.DOI:10.1520/C1792-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Baroghel-Bouny,V.,Thiery,M.,Barberon,F.,Coussy,O.,and Villain,G.,“Assessment of Transport Properties of Cementitious Materials:A Major Challengeas Regards Durability?,”European Reviews in Civil Engineering,Vol 11,No.6,2007,pp.671696.4Samson,E.,Maleki,K.,Marchand,J.,and Zhang,T.,“Determination of theWater Diffusivity of Concrete Using Drying/Absorption Test Results,”Journal ofASTM International,Vol 5,No.7,2008,pp.112.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 used in numerical models to estimate service life of concreteand reinforced concrete members exposed to different environ-mental conditions.5,65.3 The test method provides instruction and a sequence ofsteps for measuring mass loss versus time.The preferred rate ofthis mass loss will depend on the application.For example,forinterior commercial flooring applications,a mass loss thatoccurs quickly may be preferable,while for outdoor exposuresin an aggressive environment,slower mass loss may bebeneficial.6.Apparat