1、Designation:D4992141Standard Practice forEvaluation of Rock to be Used for Erosion Control1This standard is issued under the fixed designation D4992;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number i
2、n parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEEditorially corrected referenced document in April 2015.1.Scope*1.1 This practice covers the evaluation of rock to be used forerosion control.The complex
3、ity and extent of this evaluationwill be governed by the size and design requirements of theindividual project,the quantity and quality of rock required,and the potential risk for property damage or loss of humanlife.1.2 It is not intended that all of the evaluations listed in thispractice be addres
4、sed for every project.For some small,lesscritical jobs,a visual inspection of the rock may be all that isnecessary.Several of the evaluations listed may be necessaryon large,complex,high-hazard projects.The intensity andnumber of evaluations made on any one project must bedetermined by the designer.
5、1.3 Examination of the rock at the source,evaluation ofsimilar rock exposed to the environment at any fieldinstallations,as well as laboratory tests may be necessary todetermine the properties of the rock as related to its predictedperformance at the site of intended use(1,2,3,4,5,6).21.4 The examin
6、ation of the rock at its source is essential toits evaluation for erosion control and aids in the planning of thesubsequent laboratory examinations.Very large pieces of rockup to several tons weight are used in the control of erosion;thus great care must be taken with the field descriptions and inth
7、e sampling program to assure that zones of impurities orweaknesses that might not occur in ordinary size specimens arerecorded and evaluated for their deleterious potential under theconditions of intended use.It is necessary that the intendedmethod of rock removal be studied to ascertain whether the
8、samples taken will correspond to the blasting,handling,andweathering history of the rock that will finally be used(3).1.5 The specific procedures employed in the laboratoryexaminations depend on the kind of rock,its characteristics,mineral components,macro and micro structure,and perhapsmost importa
9、ntly,the intended use,size of the pieces,and theexposure conditions at the site of use(1,2,3,4).1.6 It is assumed that this practice will be used by personnelwho are qualified by education and experience to plan thenecessary evaluations and to conduct them so that the neces-sary parameters of the su
10、bject rock will be defined.Therefore,this practice does not attempt to detail the laboratory tech-niques required,but rather to mention them and only detailthose properties that must be of special concern in the courseof the examination for rock to be used for erosion control.1.7 The values stated i
11、n SI units are to be regarded as thestandard.The inch-pound units given in parentheses are forinformation only.1.8 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
12、and health practices and determine the applica-bility of regulatory limitations prior to use.1.9 This practice offers a set of instructions for performingone or more specific operations.This document cannot replaceeducation or experience and should be used in conjunctionwith professional judgment.No
13、t all aspects of this practice maybe applicable in all circumstances.This ASTM standard is notintended to represent or replace the standard of care by whichthe adequacy of a given professional service must be judged,nor should this document be applied without consideration ofa projects many unique a
14、spects.The word“Standard”in thetitle of this document means only that the document has beenapproved through the ASTM consensus process.2.Referenced Documents2.1 ASTM Standards:3C88 Test Method for Soundness of Aggregates by Use ofSodium Sulfate or Magnesium SulfateC127 Test Method for Relative Densi
15、ty(Specific Gravity)1This practice is under the jurisdiction of ASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.17 on Rock for ErosionControl.Current edition approved May 1,2014.Published May 2014.Originallyapproved in 1989.Last previous edition approved in 20
16、07 as D4992 07.DOI:10.1520/D4992-14E01.2The boldface numbers in parentheses refer to the list of references at the end ofthis standard.3For 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 Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,Wes
