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

Long Term Pavement Performance Project Laboratory Materials Testing and Handling Guide

Protocol P46
Test Method for Resilient Modulusof Unbound Granular Base/Subbase Materials and Subgrade Soils (UG07, SS07)

4. APPLICABLE DOCUMENTS

4.1 AASHTO Standards

T88 Particle Size Analysis of Soils
T99 The Moisture Density Relations of Soils Using a 5.5-lb (2.5-kg) Rammer and 12 Inch (305-mm) Drop
T100 Specific Gravity of Soils
T233 Density of Soil in Place by Block, Chunk or Core Sampling
T234 Strength parameters of soils by Triaxial Compression
T265 Laboratory Determination of Moisture Content of Soils
T292 Resilient Modulus of Subgrade Soils and Untreated Base/Subbase Materials
T238 Density of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth)
T239 Moisture Content of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth)

4.2 LTPP Protocols

P41 Gradation of Unbound Granular Base and Subbase Materials
P42 Hydrometer Analysis of Subgrade Soils
P43 Determination of Atterberg Limits of Unbound Granular Base and Subbase Materials and Subgrade Soils
P44 Moisture Density Relations of Unbound Granular Base and Subbase Materials
P47 Classification and Description of Unbound Granular Base and Subbase Materials
P49 Determination of Natural Moisture Content
P51 Sieve Analysis of Subgrade Soils
P52 Classification and Description of Subgrade Soils
P55 Moisture Density Relations of Subgrade Soils

4.3 ASTM Standards

E380 Standard Practice for Use of the International System of Units (SI) (The Modernized Metric System)

5. UNBOUND MATERIALS TESTING PREREQUISITES

5.1 Laboratory Testing Prerequisites for Unbound Granular Base/Subbase Materials

For testing unbound granular base/subbase materials, the following tests shall be performed prior to resilient modulus testing:

For the GPS testing program, in addition to this testing of unbound granular base/subbase materials, the following information shall be available from the field sampling and testing data sheets:

If the available bulk sample is insufficient in size and a sample from one test is reused for other test(s) and/or the resilient modulus, then the appropriate comment code shall be used in reporting the test results for P46.

5.2 Laboratory Testing Prerequisites for Untreated Subgrade Soils

(a) For testing subgrade materials obtained from bulk samples, the following tests shall be performed prior to resilient modulus testing:

For the GPS testing program, in addition to this testing of subgrade materials, the following information shall be available from the field sampling and testing data sheets:

If the available bulk sample is insufficient in size and a sample from one test is reused for other test(s) and/or the resilient modulus, then the appropriate comment code shall be used in reporting the test results for P46.

(b) Instructions for undisturbed thin walled tube samples of subgrade soils: If the thin walled tubes are available and acceptable for the resilient modulus test the "undisturbed" thin walled tube sample shall be used in the resilient modulus testing. The comment code 87 shall be used in reporting the test results for P46.

(c) If a thin walled tube sample is not available or acceptable for testing then use bulk samples to reconstitute the test specimen for the resilient modulus testing. The comment code 88 shall be used in reporting the test results for P46. Additional comment codes, if applicable, shall be used to identify the manner of reconstitution for the material.


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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).
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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