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Publication Number: FHWA-RD-07-052
Date: September 2007

Long Term Pavement Performance Project Laboratory Materials Testing and Handling Guide

Protocol P72
Test Method for Useof The Dynamic Cone Penetrometer in Shallow Pavement Applications (UG14, SS14)

This LTPP Protocol covers the procedures to assess in situ strength of undisturbed soil and/or compacted material using the DCP with an 8-kg (17.6-lb) hammer. The test shall be carried out in accordance with ASTM D6951-03 as modified by the following. The sections of the reference standard included in this protocol without modifications shall be strictly followed. All other sections of this protocol shall be followed as herein written.

8. REPORT

8.1 LTPP Region, State, State Code, Experiment Number, SHRP ID, Route/Highway Name, Lane, Direction (North = N, South = S, East = E, West = W), Sample/Test Location, Operator, Hammer Weight, Test Date, Location Station, Depth of Zero Point Below Surface, Lateral Location, Layer Tested.

8.2 Results:

8.2.1 Number of hammer blows between test readings.

8.2.2 Cumulative penetration after each set of hammer blows, in millimeters.

8.2.3 Difference in cumulative penetration between readings, in millimeters.

8.2.4 Penetration per blow, in millimeters. It is calculated by dividing the cumulative penetration by the number of blows between test readings.

8.2.5 Hammer factor. For 8-kg (17.6-lb) hammer, enter 1. For 4.6-kg (10.1-lb) hammer, enter 2.

8.2.6 DCP index, in millimeters per blow. This index is the result of multiplying the penetration per blow by the hammer factor.

8.2.7 CBR, in percent. It is taken from CBR versus DCP index correlation.

8.2.8 Moisture content, in percent, when available.

8.4 Comments shall include LTPP standard comment code (s) as shown in Section 4.3 of this Guide, and any other note as needed.

LTPP LABORATORY MATERIAL HANDLING AND TESTING
LABORATORY MATERIAL TEST DATA
PENETRATION RATE OF THE DYNAMIC CONE PENETROMETER
LAB DATA SHEET T72

BASE/SUBGRADE SOILS
LTPP TEST DESIGNATION: UG14, SS14/LTPP PROTOCOL P72

LTPP REGION:_________________ STATE CODE: __ __

STATE:__________________ SHRP ID: __ __ __ __

OPERATOR:_______________ FIELD SET NO.: __

TEST DATE:__ __-__ __-__ __ __ __ LOC NO.: __ __ __ __ __ __

HAMMER WEIGHT: ? 8-Kg ? 4.6-Kg

LOCATION STATION:________________ DEPTH OF ZERO POINT BELOW SURFACE: _____________ mm

LATERAL LOCATION (Distance from outside lane marker): __ __.__ m

Number of blows Cumulative penetration (mm) Penetration between readings (mm) Penetration per blow (mm) Hammer Factor DCP Index (mm/blow) CBR (%) Moisture (%)
__ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __
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__ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __
__ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __

Note: If additional rows needed, please use another data sheet.

COMMENTS

      (a) CODE __ __ __ __ __ __ __ __ __ __ __ __

      (b) NOTE _______________________________________________________

SUBMITTED BY, DATECHECKED AND APPROVED, DATE
____________________________________________________________
LABORATORY CHIEF
Affiliation______________________
Affiliation______________________

 

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The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT). Provide leadership and technology for the delivery of long life pavements that meet our customers needs and are safe, cost effective, and can be effectively maintained. Federal Highway Administration's (FHWA) R&T Web site portal, which provides access to or information about the Agency’s R&T program, projects, partnerships, publications, and results.
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