ASTM D5858-1996(2008) 895 Standard Guide for Calculating In Situ Equivalent Elastic Moduli of Pavement Materials Using Layered Elastic Theory《使用多层弹性理论计算筑路材料原位相等弹性模量的标准指南》.pdf
《ASTM D5858-1996(2008) 895 Standard Guide for Calculating In Situ Equivalent Elastic Moduli of Pavement Materials Using Layered Elastic Theory《使用多层弹性理论计算筑路材料原位相等弹性模量的标准指南》.pdf》由会员分享,可在线阅读,更多相关《ASTM D5858-1996(2008) 895 Standard Guide for Calculating In Situ Equivalent Elastic Moduli of Pavement Materials Using Layered Elastic Theory《使用多层弹性理论计算筑路材料原位相等弹性模量的标准指南》.pdf(7页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 5858 96 (Reapproved 2008)Standard Guide forCalculating In Situ Equivalent Elastic Moduli of PavementMaterials Using Layered Elastic Theory1This standard is issued under the fixed designation D 5858; the number immediately following the designation indicates the year oforiginal adoptio
2、n or, in the case of revision, the year of last 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 guide covers the concepts for calculating the in situequivalent layer
3、elastic moduli can be used for pavementevaluation, rehabilitation and overlay design. The resultingequivalent elastic moduli calculated from the deflection dataare method-dependent and represent the stiffnesses of thelayers under a specific nondestructive deflection testing (NDT)device at that parti
4、cular test load and frequency, temperature,and other environmental and site-specific conditions. Adjust-ments for design load, reference temperature, and other design-related factors are not covered in this guide. The intent of thisguide is not to recommend one specific method, but to outlinethe gen
5、eral approach for estimating the in situ elastic moduli ofpavement layers.1.2 This guide is applicable to flexible pavements and insome cases, rigid pavements (that is, interior slab loading), butis restricted to the use of layered elastic theory2as the analysismethod. It should be noted that the va
6、rious available layeredelastic computer modeling techniques use different assump-tions and algorithms and that results may vary significantly.Other analysis procedures, such as finite element modeling,may be used, but modifications to the procedure are required.NOTE 1If other analysis methods are de
7、sired, the report listed inFootnote 3 can provide some guidance.1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 This standard doe
8、s 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.31.5 This guide offers an organized
9、collection of informationor a series of options and does not recommend a specificcourse of action. This document cannot replace education orexperience and should be used in conjunction with professionaljudgment. Not all aspects of this guide may be applicable in allcircumstances. This ASTM standard
10、is not intended to repre-sent or replace the standard of care by which the adequacy ofa given professional service must be judged, nor should thisdocument be applied without consideration of a projects manyunique aspects. The word “Standard” in the title of thisdocument means only that the document
11、has been approvedthrough the ASTM consensus process.2. Referenced Documents2.1 ASTM Standards:4D 653 Terminology Relating to Soil, Rock, and ContainedFluidsD 4123 Test Method for Indirect Tension Test for ResilientModulus of Bituminous Mixtures5D 4602 Guide for Nondestructive Testing of PavementsUsi
12、ng Cyclic-Loading Dynamic Deflection EquipmentD 4694 Test Method for Deflections with a Falling-Weight-Type Impulse Load DeviceD 4695 Guide for General Pavement Deflection Measure-ments3. Terminology3.1 DefinitionsIn addition to Terminology D 653, thefollowing definitions are specific to this standa
13、rd:1This guide is under the jurisdiction of ASTM Committee E17 on Vehicle -Pavement Systems and is the direct responsibility of Subcommittee E17.41 onPavement Testing, Evaluation, and Management Methods.Current edition approved June 1, 2008. Published July 2008. Originally approvedin 1996. Last prev
14、ious edition approved in 2003 as D 5858 96 (2003).2The concepts of elastic layer theory are discussed in Chapter 2 of Principles ofPavement Design, by E. J. Yoder and M. W. Witczak, published by John Wiley andSons, Inc., 1975.3Corrections or adjustments and a complete discussion of the use of each o
15、fthese analysis methods with different NDT devices may be found in: Lytton, R. L.,F. P. Germann, Y. J. Chou, and S. M. Stoffels“ Determining Asphalt ConcretePavement Structural Properties by Nondestructive Testing,” NCHRP Report No.327, National Cooperative Highway Research Program, 1990.4For refere
16、nced 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.5Withdrawn.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box
17、C700, West Conshohocken, PA 19428-2959, United States.3.1.1 backcalculationanalytical technique used to deter-mine the equivalent elastic moduli of pavement layers corre-sponding to the measured load and deflections. The analysismay be performed by any of the following methods: iteration,database-se
18、arching, closed-form solutions (currently availableonly for two layer pavement systems), and simultaneousequations (using non-linear regression equations developedfrom layered elastic analysis output data). The primary empha-sis of this guide will be concerned with the first method;however, many of
19、the ideas pertaining to the use of the iterativeconcept also apply to the other approaches. An iterativeanalysis procedure involves assuming “seed” moduli values fora layered pavement structure, computing the surface deflectionat several radial distances from the load, comparing thecomputed and meas
20、ured deflections, and repeating the process,changing the layer moduli each time, until the differencebetween the calculated and measured deflections are withinselected tolerance(s) or the maximum number of iterations hasbeen reached. Alternatively, the analysis procedure may in-volve searching throu
21、gh a data base of precalculated deflectionbasins computed from a factorial of known layer moduli andthicknesses until a basin is found that “closely matches” themeasured deflection basin. When analyzing pavement behav-ior, surface deflections and other responses are typicallycalculated (in the “forw
22、ard” direction) from layered pavementanalysis programs that use layer moduli as input. In “backcal-culation,” layer moduli are selected and adjusted to ultimatelycompute surface deflections that best match known surfacedeflections.3.1.2 deflection sensorthe term that shall be used in thisguide to re
23、fer to the electronic device(s) capable of measuringthe vertical movement of the pavement and mounted in such amanner as to minimize angular rotation with respect to itsmeasuring plane at the expected movement. Sensors may be ofseveral types, such as seismometers, velocity transducers, oracceleromet
24、ers.3.1.3 deflection basinthe idealized shape of the deformedpavement surface due to a cyclic or impact load as depictedfrom the peak measurements of five or more deflection sensors.3.1.4 equivalent elastic modulusthe effective in situmodulus of a material, which characterizes the relationship ofstr
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