ASTM-D4748 1998

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D4748-98 Standard Test Method for Determining the Thickness of Bound Pavement Layers Using Short-Pulse Radar

Published By	Publication Date	Number of Pages
ASTM	1998	4

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Categories: 93.080.20 - Road construction materials, ASTM

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Description

ASTM D4748-98

Historical Standard: Standard Test Method for Determining the Thickness of Bound Pavement Layers Using Short-Pulse Radar

ASTM D4748

Scope

1.1 This test method covers the nondestructive determination of thickness of bound pavement layers using short-pulse radar.

1.2 The accuracy and applicability of this test method is a function of these components: radar-system penetration, radar-system resolution, and the dielectric constant.

1.2.1 As the electromagnetic wave generated by radar propagates through the bound pavement layers, the wave is attenuated and contaminated. At some depth, this attenuation and contamination becomes so severe that accurate layer-thickness determination cannot be made by the radar. This maximum penetration depth is a complex function of radar system parameters such as transmitted power, receiver sensitivity, and signal processing, as well as the electromagnetic properties of the pavement materials and environmental factors such as moisture content. A typical system for this application should have a minimum penetration depth of 20 in. (508 mm).

1.2.2 Radar system resolution is determined mainly by the transmitted pulse width of the radar. A typical system for this application usually has a resolution sufficient to determine layer thicknesses of 1 in. or greater, to an accuracy of +0.2 in. Radar-derived layer-thickness information without prior knowledge, or core verification, of dielectric constants, is an estimation.

1.3 This test method may not be suitable for application to extremely moist or wet (saturated) pavements due to the increased attenuation of the electromagnetic signal caused by such moisture.

1.4 The values stated in inch-pound units are to be regarded as the standard.

1.5 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. Specific hazard statements are given in Section 6.

Note 1-Bound pavement layers are defined as the upper layers of a pavement, consisting of materials such as bituminous, concrete, portland-cement concrete, roller-compacted concrete, and stabilized bases. Bound pavement layers do not include granular base and subbase materials.

Keywords

Attenuation; Transducers; thickness of bound pavement layers, using short-pulse radar,test,; Calibration-pavement testing analysis instrumentation; Contamination; Eddy current examination; Electromagnetic (eddy current) testing; Incident energy; Layers; Nondestructive evaluation (NDE)-nonmetallic materials; Pavement surfaces; Penetration-bituminous materials; Radar; Reflectance and reflectivity; Reflected energy; Short-pulse radar; Signal processing/display; Thickness; thickness of bound pavement layers, using short-pulse radar, test

ICS Code

ICS Number Code 93.080.20 (Road construction materials)

DOI: 10.1520/D4748-98

PDF Catalog

PDF Pages	PDF Title
1	Scope Summary of Test Method
2	Significance and Use Interferences Apparatus FIG. 1
3	Hazards Calibration and Standardization FIG. 2 FIG. 3
4	Procedure Calculation Precision and Bias Keywords TABLE 1

Additional information

Standard Title	D4748-98 Standard Test Method for Determining the Thickness of Bound Pavement Layers Using Short-Pulse Radar
Published Code	ASTM
Publication Date	1998
Pages Count	4
ICS Codes	93.080.20 - Road construction materials