1、Designation:E2835 11Standard Test Method forMeasuring Deflections using a Portable Impulse Plate LoadTest Device1This standard is issued under the fixed designation E2835;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of la
2、st revision.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 applies to measuring plate deflectionsusing a Portable Impulse Plate Load Test device.The methodcovers the m
3、easurement of deflection of the load plate ratherthan the deflection of the surface of the pavement or foundationlayers(see Note 1).1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 This standard does not purport to addres
4、s 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 Documents2.1 ASTM Standards:2D4695 Guide for Gene
5、ral Pavement Deflection Measure-mentsD1195 Test Method for Repetitive Static Plate Load Tests ofSoils and Flexible Pavement Components,for Use inEvaluation and Design ofAirport and Highway Pavements3.Summary of Test Method3.1 This test method is a type of plate bearing test.The loadis a force pulse
6、generated by a falling mass dropped onto aspring assembly that transmits the load pulse to a plate restingon the material under test.3.2 The mass is raised to a preset height and then dropped todeliver the desired force pulse.The device is calibrated to apreset drop height by the manufacturer.The pr
7、eset drop heightshall not be changed by the user.3.3 The resulting plate deflection is measured using suitableinstrumentation.Multiple drops from the same preset dropheight may be performed at the same test location.3.4 The peak plate deflection resulting from each drop ateach location is recorded i
8、n micrometers or other unit ofmeasure,as appropriate.4.Significance and Use4.1 This test method covers the determination of platedeflection resulting from the application of an impulse load.The deflection is measured at the center of the top of the loadplate(see Note 1).NOTE1If the load plate is in“
9、perfectly uniform”contact with theunbound material under the plate,then deflection of the load plate shouldbe equal to the deflection of the surface of the unbound material under test.However,with typical unbound materials a 100%uniform contact canseldom be achieved.Accordingly,the test surface shal
10、l be as clean andsmooth as possible with loose granules and protruding material removed.For gravel surfaces it is recommended that a thin layer of fine sand beplaced over the test point.For fine-grained materials,this will help inobtaining a reasonably uniform contact between the load plate and thes
11、urface.See 5.1 in Test Method D1195.4.2 Deflections may be either correlated directly to pave-ment performance or used to determine in-situ material char-acteristics of the pavement foundation layers.Some uses of thedata include quality control and quality assurance of com-pacted layers,and for stru
12、ctural evaluation of load carryingcapacity(see Note 2 and Guide D4695).NOTE2The volume of the pavement foundation materials affected bythe applied load is a function of the magnitude of the load,plate size andrigidity,loading rate,buffer stiffness,and the stiffness and shear strengthof the pavement
13、foundation materials.Therefore,care must be taken whenanalyzing the results because the data obtained by the Portable ImpulsePlate Load Test may be obtained under substantially different conditionsthan when a heavy moving wheel load passes over the pavement surfaceafter construction is complete.5.Ap
14、paratus5.1 Instrumentation System,conforming to the followinggeneral requirements.5.2 Instruments Exposed to the Elements,operable in thetemperature range from 0C to 50C(32F to 120F)and1This test method is under the jurisdiction of ASTM Committee E17 on Vehicle-Pavement Systems and is the direct res
15、ponsibility of Subcommittee E17.41 onPavement Testing and Evaluation.Current edition approved June 1,2011.Published June 2011.DOI:10.1520/E2835112For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volu
16、me information,refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.tolerant to relatively high humidity,rain and spray,and otheradverse conditions such as dust,shock,and vibrations normallyencountered.5.3 Force-Generating Device(falling mass),capable ofbeing raised,using a guide system,to a preset fixed height anddropped onto a steel-spring subassembly.Designed to operatewith