1、Designation:D1635/D1635M12Standard Test Method forFlexural Strength of Soil-Cement Using Simple Beam withThird-Point Loading1This standard is issued under the fixed designation D1635/D1635M;the number immediately following the designation indicates theyear of original adoption or,in the case of revi
2、sion,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the determination of the flexuralstrength of soil-cement by the use of a simple b
3、eam withthird-point loading.NOTE1For methods of molding soil-cement specimens,see PracticeD1632.1.2 All observed and calculated values shall conform to theguidelines for significant digits and rounding established inPractice D6026 unless superseded by this standard.1.3 UnitsThe values stated in eith
4、er SI units or inch-pound units are to be regarded separately as standard.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in non-conformance with the standard.The SI units are
5、 presented inbrackets.1.3.1 The gravitational system of inch-pound units is usedwhen dealing with inchpound units.In this system,the pound(lbf)represents a unit of force(weight),while the unit for massis slugs.The rationalized slug unit is not given,unless dynamic(F=ma)calculations are involved.1.4
6、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 Documents
7、2.1 ASTM Standards:2D653 Terminology Relating to Soil,Rock,and ContainedFluidsD1632 Practice for Making and Curing Soil-Cement Com-pression and Flexure Test Specimens in the LaboratoryD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in
8、Engineering Design and ConstructionD6026 Practice for Using Significant Digits in GeotechnicalDataE4 Practices for Force Verification of Testing Machines3.Terminology3.1 For common definitions of terms in this standard,referto Terminology D653.4.Significance and Use4.1 This test method is used to de
9、termine the flexuralstrength of soil-cement.Flexural strength is significant inpavement design and is used to determine slab thickness.NOTE2The quality of the result produced by this standard isdependent on the competence of the personnel performing it,and thesuitability of the equipment and facilit
10、ies used.Agencies that meet thecriteria of Practice D3740 are 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 facto
11、rs;Practice D3740provides a means of evaluating some of those factors.5.Apparatus5.1 Testing MachineThe testing machine may be of anytype having sufficient capacity and control to provide the rateof loading(prescribed in 7.2).It shall conform to the require-ments of Section 15 of Practices E4.The te
12、sting machine shallbe equipped with a spherically seated head block having abearing surface of at least 75%of the width of the beam butnot greatly in excess of the width of the beam.The movableportion of this block shall be held closely in the spherical seat,but the design shall be such that the bea
13、ring face may berotated freely and tilted through small angles in any direction.5.2 The third-point loading method used in making flexuretests of soil-cement shall employ bearing blocks that willensure that forces applied to the beam will be vertical only andapplied without eccentricity.A diagrammat
14、ic drawing of anapparatus that accomplishes this purpose is shown in Fig.1.The apparatus shall be designed to incorporate the followingprinciples:1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.15 on Stabilization
15、WithAdmixtures.Current edition approved May 1,2012.Published June 2012.Originallyapproved in 1959.Last previous edition approved in 2000 as D1635 00(2006).DOI:10.1520/D1635_D1635M-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org
16、.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 19428-2959.United States1 5.2.1 The distance between supports and points of loadapplication shall remain constant for a given apparatus.5.2.2 The direction of the reactions shall be parallel to thedirection of the applied load at all
