1、Designation:D421908Standard Test Method forUnconfined Compressive Strength Index of Chemical-Grouted Soils1This standard is issued under the fixed designation D4219;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last rev
2、ision.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 covers the determination of the short-term unconfined compressive strength index of chemicallygrouted soils,using
3、strain-controlled application of test load.1.2 This standard does not purport to address all of thesafety problems,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
4、limitations prior to use.1.3 This test method offers a set of instructions for perform-ing one or more specific operations.This document cannotreplace education or experience and should be used in con-junction with professional judgment.Not all aspects of thispractice may be applicable in all circum
5、stances.This ASTMstandard is not intended to represent or replace the standard ofcare by which the adequacy of a given professional servicemust be judged,nor should this document be applied withoutconsideration of a projects many unique aspects.The word“Standard”in the title of this document means o
6、nly that thedocument has been approved through the ASTM consensusprocess.2.Referenced Documents2.1 ASTM Standards:2D422 Test Method for Particle-Size Analysis of SoilsD653 Terminology Relating to Soil,Rock,and ContainedFluidsD2166 Test Method for Unconfined Compressive Strengthof Cohesive SoilD3740
7、Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD4320 Practice for Laboratory Preparation of ChemicallyGrouted Soil Specimens for Obtaining Design StrengthParametersD6026 Practice for Using Significant D
8、igits in GeotechnicalDataE4 Practices for Force Verification of Testing Machines3.Terminology3.1 For common definitions of terms used in this testmethod,refer to Terminology D653.3.2 Definitions of Terms Specific to This Standard:3.2.1 curing conditionsthe environment,particularly tem-perature and h
9、umidity,and state of confinement at which aspecimen is stored during the time interval between fabricationand testing.3.2.2 unconfined compressive strengththe load per unitarea at which an unconfined cylindrical specimen of soil willfail in a simple compressive test.Failure is defined as themaximum
10、load attained per unit area,or the load per unit areaat 20%strain,whichever occurs first.4.Summary of Test Method4.1 A cylindrical specimen of chemically grouted soil issubjected to a(approximate)constant rate of compressivestrain until it fails.5.Significance and Use5.1 The purpose of this test met
11、hod is to obtain values forcomparison with other test values to verify uniformity ofmaterials or the effects of controllable variables,in grout-soilcompositions.5.2 This test method is similar,in principle,to Test MethodD2166,but is not intended for determination of strengthparameters to be used in
12、design.Such values are more properlyobtained from long-term triaxial tests.NOTE1The quality of the result produced by this standard isdependent on the competence of the personnel performing it,and thesuitability of the equipment and facilities used.Agencies that meet thecriteria of Practice D3740 ar
13、e generally considered capable of competentand objective testing/sampling/inspection/etc.Users of this standard arecautioned that compliance with Practice D3740 does not in itself assurereliable results.Reliable results depend on many factors;Practice D3740provides a means of evaluating some of thos
14、e factors.1This method is under the jurisdiction of ASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.15 on Stabilization WithAdmixtures.Current edition approved Jan.1,2008.Published February 2008.Originallyapproved in 1983.Last previous edition approved in 2002
15、 as D4219 02.DOI:10.1520/D4219-08.2For 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.Copyright ASTM International,100
16、 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Apparatus6.1 Compression DeviceThe compression testing machinemay be of any type having sufficient capacity and control toprovide the rate of loading prescribed in 8.4.It shall conformto the requirements of Section 15 of Practices E4.6.1.1 Bearing SurfacesThe testing machine shall beequipped with two steel bearing blocks having a Rockwellhardness of not less than 55 HRC.One of the blocks shall bespherically seated an
