1、Designation:D298017Standard Test Method forSaturated Density,Moisture-Holding Capacity,and Porosityof Saturated Peat Materials1This standard is issued under the fixed designation D2980;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,
2、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.Scope*1.1 This test method was designed to evaluate the aeration,water penetration,and water retention properties of pea
3、t underfield conditions of water saturation by measurement of thesaturated density,the moisture holding capacity,and theporosity.1.2 UnitsThe values stated in SI units are being regardedas standard.The values given in parentheses are mathematicalconversions to inch-pound units,which are provided for
4、information only and are not considered standard.1.3 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026.1.3.1 The procedures used to specify how data are collected/recorded or calculated in this standard are regarded as
5、theindustry standard.In addition,they are representative of thesignificant digits that generally should be retained.The proce-dures used do not consider material variation,purpose forobtaining the data,special purpose studies,or any consider-ations for the users objectives;and it is common practice
6、toincrease or reduce significant digits of reported data to becommensurate with these considerations.It is beyond the scopeof this standard to consider significant digits used in analysismethods for engineering design1.4 This standard does not purport to address all of thesafety concerns,if any,asso
7、ciated 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:2D653 Terminology Relating to Soil,Rock,and ContainedFluidsD
8、2974 Test Methods for Moisture,Ash,and Organic Matterof Peat and Other Organic SoilsD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD4753 Guide for Evaluating,Selecting,and Specifying Bal-ances and
9、 Standard Masses for Use in Soil,Rock,andConstruction Materials TestingD6026 Practice for Using Significant Digits in GeotechnicalDataE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 Definitions:3.1.1 For common definitions of common terms in thisstandard,refer to Ter
10、minology D653.4.Summary of Test Method4.1 The test method sets up standardized conditions formeasuring the volume and mass of saturated peat.From thesedata,saturated volume,mass,moisture-holding capacity(on amass and volume basis),dry peat volumes,and porosity can bedetermined.5.Significance and Use
11、5.1 This test method measures the air-filled spaces(poros-ity)and the moisture-holding capacity of peat on both a massand a volume basis under conditions of saturation.If largespaces are present,water and air can penetrate easily.If spacesare smaller,the water holding capacity is increased.Waterhold
12、ing capacity is larger in humified peat materials(smallinter-particulate spaces)(sapric soil),whereas water and air-penetration is larger in unhumified peat(larger inter-particulatespaces)(fibric soil).The spaces can also be an indication of theoxygen available to the plant roots.As such,the interpl
13、ay of theproperties of moisture holding capacity and porosity dictate thebest use of the harvested organic soil material as well as thebest management practices for organic soils.The moisture1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibi
14、lity of Subcommittee D18.22 on Media for PlantGrowth.Current edition approved Feb.1,2017.Published February 2017.Originallyapproved in 1971.Last previous edition approved in 2010 as D2980 04(2010).DOI:10.1520/D2980-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM
15、Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA
16、 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 retention relationships of these soils are critical to decisionsinvolving irrigation,drainage,and bearing capacity of thesesoil.NOTE1The quality of the result