ASTM_D_1195_-_D_1195M_-_09_2015.pdf

Designation:D1195/D1195M09(Reapproved 2015)Standard Test Method forRepetitive Static Plate Load Tests of Soils and FlexiblePavement Components,for Use in Evaluation and Design ofAirport and Highway Pavements1This standard is issued under the fixed designation D1195/D1195M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,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.Scope1.1 This test method covers a procedure for making repeti-tive static plate load tests on subgrade soils and compactedpavement components,in either the compact condition or thenatural state,and provides data for use in the evaluation anddesign of rigid and flexible-type airport and highway pave-ments.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 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.Terminology2.1 Definitions:2.1.1 deflection,nthe amount of downward vertical move-ment of a surface due to the application of a load to the surface.2.1.2 rebound deflection,nthe amount of vertical reboundof a surface that occurs when a load is removed from thesurface.2.1.3 residual deflection,nthe difference between originaland final elevations of a surface resulting from the applicationand removal of one or more loads to and from the surface.3.Significance and Use3.1 Field,in-place repetitive static plate load tests are usedfor the evaluation and design of pavement structures.Repeti-tive static plate load tests are performed on soils and unboundbase and subbase materials to determine a measure of the shearstrength of pavement components.4.Apparatus4.1 Loading DeviceA truck or trailer or a combination ofboth a tractor-trailer,an anchored frame,or other structureloaded with sufficient weight to produce the desired reaction onthe surface under test.The supporting points(wheels in thecase of a truck or trailer)shall be at least 2.4 m 8 ft from thecircumference of the largest diameter bearing plate being used.4.2 Hydraulic Jack Assembly,with a spherical bearingattachment,capable of applying and releasing the load inincrements.The jack shall have sufficient capacity for applyingthe maximum load required,and shall be equipped with anaccurately calibrated gauge that will indicate the magnitude ofthe applied load.4.3 Bearing PlatesAset of circular steel bearing plates notless than 25.4 mm 1 in.in thickness,machined so that theycan be arranged in pyramid fashion to ensure rigidity,andhaving diameters ranging from 152 to 762 mm 6 to 30 in.The diameters of adjacent plates in the pyramid arrangementshall not differ by more than 152 mm 6 in.NOTE1A minimum of four different plate sizes is recommended forpavement design or evaluation purposes.For evaluation purposes alone,asingle plate may be used,provided that its area is equal to the tire-contactarea corresponding to what may be considered as the most criticalcombination of conditions of wheel load and tire pressure.For the purposeof providing data indicative of bearing index(for example,the determi-nation of relative subgrade support throughout a period of a year),a singleplate of any selected size may be used.4.4 Dial Gauges,two or more,graduated in units of 0.03mm 0.001 in.and capable of recording a maximum deflectionof 25 mm 1 in.or other equivalent deflection-measuringdevices.4.5 Deflection BeamA beam upon which the dial gaugesshall be mounted.The beam shall be a 64-mm 212-in.standard black pipe or a 76 by 76 by 6-mm 3 by 3 by14-in.steel angle or equivalent.It shall be at least 5.5 m 18 ft longand shall rest on supports located at least 2.4 m 8 ft from the1This test method is under the jurisdiction of ASTM Committee E17 on Vehicle-Pavement Systems and is the direct responsibility of Subcommittee E17.41 onPavement Testing and Evaluation.Current edition approved May 1,2015.Published August 2015.Originallyapproved in 1952.Last previous edition approved in 2009 as D1195 09.DOI:10.1520/D1195_D1195M-09R15.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 circumference of the bearing plate or nearest wheel or support-ing leg.The entire deflection measuring system shall beadequately shaded from direct rays of the sun.4.6 Miscellaneous Tools,including a spirit level,for prepa-ration of the surface to be tested and for operation of theequipment.5.Procedure5.1 Carefully center