ANEXO 4 - ASTM D-4695

Designation: D 4695 – 03

Standard Guide for 

General Pavement Deflection Measurements1 This standard is issued under the fixed designation D 4695; the number immediately following the designation indicates the year of  original adoption or, in the case of revision, the year of last revision ! number in parentheses indicates the year of last reapproval ! superscript epsilon epsilon "e# indicates an editorial change since the last revision or reapproval

1. Scope

$$ This guide provides procedural procedural information for for measur% ing pavement surface deflections, directly under, or at locations radially outward "offset# from a &nown static, steady%state, or impulse load Deflections are measured with sensors that monitor the vertical movement of a pavement surface due to the load This guide describes procedures for  the deflection measurement using various deflection testing devices and provides the general information that should be obtained regardless of the type of testing device used $' This (uide is applicable for deflection measurements  performed on flexible asphalt concrete "!)#, rigid portland cement concrete "*))#, or composite "!)+*))# pavements igid pavements may be plain, -ointed, -ointed reinforced, or  continuously reinforced concrete $. The values stated in /0 units are to be regarded as standard 0nch%pound units given in parentheses are for infor% mation purposes only $4 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 2. Referenced Documents

'$  AST Standards! ' D 461' 2ondestructive Testing Testing of *avements 3sing 3sing )yclic% oading Dynamic Deflection uipment D 4694 Deflections 7ith a 8alling%7eig 8alling%7eight%Type ht%Type 0mpulse oad Device D 55 (uide for )alculating 0n /itu uivalent lastic :oduli of *avement :aterials 3sing ayered lastic Theory $

This guide is under the -urisdiction of )ommittee D14 on oad and *aving :aterials and is the direct responsibility responsibility of /ubcommittee D14.9 on 2on% Destructive Testing of *avement /tructures )urrent edition approved Dec $, '11. *ublished anuary '114 96 ' 8or referenced !/T: standards, visit the !/T: website, ww wa ast stm mo org rg,, or  contact !/T: )ustomer /ervice at service?astmo rg 8or 8or Annual  Annual "oo# of AST  Standards volume information, refer to the standard@s Document /ummary page on the !/T: website

''  AAS$T% Standard!& T'56A/tandard :ethod of Test for *avement Deflection :easurements *DDB A*avement Deflection Data xchangeATechnical Data (uide, Cersion $1, !pril $99 3. Terminology

.$  'efinitions of Terms Specific to This Standard! .$$ deflection basin, basin, n AThe bowl shape of the deformed  pavement surface due to a specified load as depicted from the  pea& measurements of a series of deflection sensors placed at radial offsets from the center of the load plate .$' deflection basin test , n A! test with deflection sensors  placed at various radial offsets from the center of the load  plate The test is used to record the shape of the deflection  basin resulting from an applied load 0nformation from this test can be used to estimate material properties for a given  pavement structure structure .$. deflection sensor , n Alectronic device"s# capable of  measuring the relative vertical movement of a pavement surface and mounted in such a manner as to minimie angular  rotation with respect to its measuring plane at the expected movement /uch devices may include seismometers, velocity transducers, or accelerometers .$4 load cell , n A)apable of accurately measuring the load that is applied perpendicular to load plate and placed in a  position to minimie the mass between the load cell and the  pavement The load cell shall be positioned in such a way that it does not restrict the ability to obtain deflection measurements under the center of the load plate The load cell shall be water resistant, and shall be resistant to mechanical shoc&s from road impacts during testing or traveling .$5 load plate, plate, n A)apable of an even distribution of the load over the pavement surface load plates may be circular in shape "or rectangular in some cases#, one piece or segmented, for measurements on conventional roads and airfields or  similar stiff pavements The plate shall be suitably constructed to allow pavement surface deflection measurements at the center of the plate

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!vailable from the !merican !ssociation of /tate Eighway and Transportation