ASTM D4695 - 03(2020)

    Standard Guide for General Pavement Deflection Measurements

    Active Standard ASTM D4695 | Developed by Subcommittee: E17.41

    Book of Standards Volume: 04.03

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    Significance and Use

    5.1 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.

    5.2 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.

    1. Scope

    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 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D4602 Guide for Nondestructive Testing of Pavements Using Cyclic-Loading Dynamic Deflection Equipment

    D4694 Test Method for Deflections with a Falling-Weight-Type Impulse Load Device

    D5858 Guide for Calculating In Situ Equivalent Elastic Moduli of Pavement Materials Using Layered Elastic Theory

    AASHTO Standard

    PDDX Pavement Deflection Data ExchangeTechnical Data Guide, Version 1.0, April 1998

    T 256 Standard Method of Test for Pavement Deflection Measurements

    ICS Code

    ICS Number Code 93.080.20 (Road construction materials)

    UNSPSC Code

    UNSPSC Code 30120000(Roads and landscape); 30111509(Asphalt based concrete)

    Referencing This Standard
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    DOI: 10.1520/D4695-03R20

    Citation Format

    ASTM D4695-03(2020), Standard Guide for General Pavement Deflection Measurements, ASTM International, West Conshohocken, PA, 2020,

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