1、Designation:D464416Standard Test Method forSlake Durability of Shales and Other Similar Weak Rocks1This standard is issued under the fixed designation D4644;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、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 covers the determination of the slakedurability index of a shale or other weak rock after three dryingand two wetting cyc
3、les with abrasion effects.1.2 UnitsThe values stated in SI units are to be regardedas standard.The values given in parentheses are mathematicalconversions to inch-pound units,which are provided forinformation only and are not considered standard.Reporting oftest results in units other than SI shall
4、not be regarded asnonconformance with this test method.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 regard
5、ed as 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 pra
6、ctice 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 design.1.4 This standard does not purport to address all of thesafety concerns,if a
7、ny,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:2D653 Terminology Relating to Soil,Rock,and Contained
8、FluidsD2113 Practice for Rock Core Drilling and Sampling ofRock for Site ExplorationD2216 Test Methods for Laboratory Determination of Water(Moisture)Content of Soil and Rock by MassD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in En
9、gineering Design and ConstructionD4753 Guide for Evaluating,Selecting,and Specifying Bal-ances and Standard Masses for Use in Soil,Rock,andConstruction Materials TestingD5079 Practices for Preserving and Transporting Rock CoreSamplesD6026 Practice for Using Significant Digits in GeotechnicalDataE11
10、Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 Definitions:3.1.1 For terminology used in this test method,refer toTerminology D653.3.2 Definitions of Terms Specific to This Standard:3.2.1 slake durability indexthe percentage by dry mass ofa collection of shale or simila
11、r rock pieces retained on a 2.00mm(No.10)sieve after three cycles of oven drying and twocycles of each 10 min of soaking in distilled water within astandard tumbling and abrasion action.4.Summary of Test Method4.1 This test method consists of placing ten pieces ofspecimens each with mass of 40-60 g
12、in a wire mesh drummounted in an apparatus where the drum is partially submergedin a trough filled with distilled water.The specimens in thedrum are rotated in the water for two cycles.Each cycleincludes rotation with speed of 20 rpm for 10 minutes.At theend of first cycle the specimen is oven dried
13、 and the total massof specimen retained in the drum is recorded.Then,a secondcycle with the same speed and time period as the first one isperformed.The retained total mass of specimen from thesecond cycle is recorded.The slake durability index is calcu-lated based on both recorded total masses of te
14、st specimenretained in the drum per each cycle.1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.12 on Rock Mechanics.Current edition approved Nov.1,2016.Published November 2016.Originallyapproved in 1987.Last previo
15、us edition approved in 2008 as D4644 08.DOI:10.1520/D4644-16.2For 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.*A Su
16、mmary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Significance and Use5.1 The test method is used to estimate qualitatively thedurability of weak rocks through weakening and disintegrationresulting from a standard two cycles of wetting and drying inthe service environment.(1-7).35.2 This test method is used to assign quantitative durabilityindex values to weak rocks.A primary
