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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)

10. REPORT

The report shall consist of the following:

The following general information is to be recorded on all of the Laboratory Data Sheets.

10.1 Specimen Identification

The specimen identification shall include: Laboratory Identification Code, State Code, SHRP ID, Layer Number, Field Set Number, Layer Type (1 = subgrade, 2 = base/subbase), Sampling Area No. (SPS-only), Sample Location Number, LTPP Sample Number, and Material Type (Type 1 or Type 2).

NOTE 19: When bulk samples are retrieved from the same general area from several BA-type 12-inch (305-mm) diameter boreholes, these bulk samples are combined, prepared and reduced to a representative test size in accordance with AASHTO T87 and AASHTO T248. Because the bulk samples are combined from several locations, the Location Number of the sample shall have an asterisk placed as the third digit. Similarly, the LTPP Sample Number should have an asterisk placed as the third and fourth digits.

10.2 Test Identification

The test identification shall include: LTPP Test Designation, LTPP Protocol Number, Laboratory Test Number, and Test Date.

10.3 Data Reporting

Report the following information on the appropriate data sheet:

10.3.1 Form T46A shall be used to record general information concerning the specimen and layer being tested. This form shall be completed only for those specimens that are recompacted from bulk samples. This form shall not be used to record information for thin-wall tube samples.

10.3.1.1 Item 8 - Record a "Y" (Yes) or "N" (No) to denote whether the sample reached 5% total vertical permanent strain during the preconditioning stage of the test procedure (Sections 8.1.2.3 and 8.2.2.3). Also, note with a "Y" (Yes) or "N" (No) whether or not the sample reached 5% total vertical permanent strain during the testing sequence. Record the number of test sequences completed, either partially or completely, for the given sample.

10.3.1.2 Item 9 - Record the specimen dimensions and perform the area and volume calculations.

10.3.1.3 Item 10 - Record the compaction weights as per Appendix B (Type 1) or Appendix C (Type 2).

10.3.1.4 Item 11 - Record the in situ moisture content/density values used as the basis for compaction of the specimen as per sections 7.3.1 and 7.3.2. These values were obtained from nuclear methods in the field (GPS test sections). If these values are not available (or not used), record the optimum moisture content, maximum dry density and 95% maximum dry density values used as the basis for compaction of the specimen as per section 7.3.3.

10.3.1.5 Item 12 - Record the moisture content of the compacted material as per section 3.16 of Appendix B (Type 1) or section 3.12 of Appendix C (Type 2). Record the moisture content of the material after the resilient modulus test as per section 8.1.2.12 (Subgrade) or section 8.2.2.12 (Base/subbase). Also, record the target density used for specimen recompaction.

10.3.1.6 Item 13 - Record the results and accompanying information for the quick-shear test procedure as per section 8.1.2.10 (Subgrade) or 8.2.2.10 (Base/Subbase).

10.3.2 Form T46B shall be used to record general information concerning the specimen and layer being tested. This form shall be completed only for thin-wall tube specimens. This form shall not be used to record information for recompacted samples.

10.3.2.1 Item 8 - Record the approximate distance from the top of the subgrade to the top of the specimen. This information can be found on the field data sheets for the test section in question.

10.3.2.2 Item 9 - Record a "Y" (Yes) or "N" (No) to denote whether the sample reached 5% total vertical permanent strain during the preconditioning stage of the test procedure (Sections 8.1.2.3 and 8.2.2.3). Also, note with a "Y" (Yes) or "N" (No) whether or not the sample reached 5% total vertical permanent strain during the testing sequence. Record the number of test sequences completed, either partially or completely, for the given sample.

10.3.2.3 Item 10 - Record the specimen dimensions and perform the area and volume calculations. Record the weight of the specimen.

10.3.2.4 Item 11 - Record the moisture content (in situ) prior to resilient modulus testing. For thin-wall tube samples, this value shall be the moisture content of the layer being tested as per the nuclear methods in the field, or in the absence of this information, the jar moisture sample results. Record the moisture content at the completion of resilient modulus testing as per section 8.1.2.12. Record the wet and dry density of the thin-wall tube sample.

10.3.2.5 Item 12 - Record the results and accompanying information for the quick-shear test procedure as per section 8.1.2.10 (Subgrade).

10.3.3 Record the test data for each specimen in a format similar to Worksheet T46 and attach with Laboratory Data Form T46A or Form T46B. The testing data for all test sequences shall be submitted to the FHWA COTR. Table 3 illustrates the completion of Worksheet T46 for one testing sequence. The following information shall be recorded on Worksheet T46:

10.3.3.1 Column 1 - Record the chamber confining pressure for the testing sequence. Only one entry need be made for the last five load cycles. This entry should correspond exactly with the confining pressure levels shown in Table 1 (Subgrade) or Table 2 (Base/subbase).

10.3.3.2 Column 2 - Record the nominal axial cyclic stress for the testing sequence. Only one entry need be made for the last five load cycles. This entry should correspond exactly with the nominal axial cyclic stress required in Table 1 (Subgrade) or Table 2 (Base/subbase).

10.3.3.3 Columns 4 through 9 - Record the actual applied loads and stresses for each of the last five load cycles as shown on the worksheet.

 

1. LABORATORY IDENTIFICATION CODE 1111
2. STATE CODE 91
3. SHRP SECTION ID 910101
4. FIELD SET NO. 1
5. LAYER NUMBER 1
6. LAYER TYPE (1 = subgrade, 2 = base/subbase) 1
7. SAMPLING AREA NO. (SA-)11
8. SHRP LABORATORY TEST NUMBER 1
9. LOCATION NUMBER A1
10. SHRP SAMPLE NUMBER TS01
11. MATERIAL TYPE 2
12. TEST DATE 01-02-93
13. RESILIENT MODULUS TESTING

 

Worksheet T46, January 2006 (Partial)

Worksheet T46, January 2006 (Partial)

SUBMITTED BY, DATECHECKED AND APPROVED, DATE
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LABORATORY CHIEF
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AffiliationAffiliation
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10.3.3.4 Columns 10 through 12 - Record the recoverable axial deformation of the sample for each LVDT independently for each of the last five load cycles. Average the response from the two LVDTs and record this value in column 12. This value will be used to calculate the axial strain of the material.

10.3.3.5 Column 13 – Compute the axial strain for each of the last five load cycles. This value is computed by dividing column 12 by the original length of the specimen, L0, which was recorded on Laboratory Test Data Form T46A (recompacted specimens) or Form T46B (thin-wall tube specimens).

10.3.3.6 Column 14 – Compute the resilient modulus for each of the last five load cycles. This value is computed by dividing column 8 by column 13.

10.3.3.7 Average – Compute the average of the last five load cycles for each column.

10.3.3.8 Standard Deviation – Compute the standard deviation of the values for each column for the last five load cycles using the equation:

 

s equals the square root of the ratio of the sum from i equals 1 to n of the square of x sub i minus the average of x over (n minus 1) which equals the square root of the ratio of (the sum from i equals 1 to n of the square of x sub i minus the ratio of the square of the sum from i equals 1 to n of x sub i over n) over (n minus 1)

 


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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).
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