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ASTM D4695-03

Current Revision

Standard Guide for General Pavement Deflection Measurements

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1.1 This guide provides procedural information for measuring pavement surface deflections, directly under, or at locations radially outward (offset) from a known 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.

1.2 This Guide is applicable for deflection measurements performed on flexible asphalt concrete (AC), rigid portland cement concrete (PCC), or composite (AC/PCC) pavements. Rigid pavements may be plain, jointed, jointed reinforced, or continuously reinforced concrete.

1.3 The values stated in SI units are to be regarded as standard. Inch-pound units given in parentheses are for information purposes only.

1.4 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.


NDT measurement of pavement surface deflections provides information that can be used for the structural evaluation of new or in-service pavements. These deflection measurements may be used to determine the following pavement characteristics:

5.1.1 Modulus of each layer.

5.1.2 Overall stiffness of the pavement system.

5.1.3 Load transfer efficiency of PCC pavement joints.

5.1.4 Modulus of subgrade reaction.

5.1.5 Effective thickness, structural number, or soil support value.

5.1.6 Bearing capacity or load carrying capacity of a pavement.

These parameters may be used for the analysis and design of reconstructed and rehabilitated flexible and rigid pavements, pavement structural adequacy assessment including joint efficiency of PCC pavement, void detection in PCC pavement, research and/or network structural inventory purposes.

SDO ASTM: ASTM International
Document Number D4695
Publication Date Dec. 1, 2003
Language en - English
Page Count 6
Revision Level 03
Supercedes
Committee E17.41
Publish Date Document Id Type View
Dec. 1, 2003 D4695-03 Revision
Jan. 1, 1996 D4695-96 Revision
Nov. 1, 2020 D4695-03R20 Reaffirmation
May 1, 2015 D4695-03R15 Reaffirmation
June 1, 2008 D4695-03R08 Reaffirmation