Laboratory Determination of Resilient Modulus for Flexible Pavement Design (2004) / Chapter Skim
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From page 13... ...
13 shall be scalped off prior to testing. Materials classified as Type 1 shall be molded in either a 152-mm (6-in)
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14 3.12 Maximum Applied Axial Stress (Smax) - The axial stress applied to the sample consisting of the contact stress and the cyclic stress (the confining stress is not included)
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15 SAMPLE START SPECIMEN SIZE 6 in 4 in 2 .8 in 1 dmax>3/4 in DISTURBED UNDISTURBED YES NO COMPACTION2 IMPACT OR VIBRATORY dmax>3/8 in YES NO % (-)
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16 CHAMBER COVER PLATE LOAD CELL STEEL BALL TOP-BOTTOM LVDT CLAMPS SUPPORTING THE VERTICAL LVDT'S CLAMP MOUNTED LVDT LOADING PISTON THOMPSON LINEAR MOTION BEARING TEST SPECIMEN BRONZE POROUS STONE BOTTOM CAP a) Triaxial Cell b)
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17 sec. duration for subgrade materials.
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19 expander, porous stones (subgrade)
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20 by more than +/- 0.5% for all materials. The dry density of a laboratory-compacted specimen should not vary more than +/- 1% from the target dry density for that layer.
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21 terminated and the appropriate item on the data sheet shall be completed. No further testing of this material is necessary.
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23 8.3.12 Continue the test for the remaining stress sequences in Table A-2 (i.e., Sequences 3 through 20) recording the vertical recovered deformation.
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24 8.4.9 Apply the specified conditioning confining pressure of 27.6 kPa (4.0 psi) to the test specimen.
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25 8.4.13 Decrease the maximum axial stress to 35.8 kPa (5.2 psi) and set the confining pressure to 41.4 kPa (6 psi)
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26 TABLE A-4 PROCEDURE Ia - TEST SEQUENCE FOR BASE/SUBBASE MATERIALS Procedure Ia (Base/Subbase Materials) Sequence Nrep kPa psi kPa psi kPa psi kPa psi 0 103.5 15.0 20.7 3.0 207.0 30.0 227.7 33.0 1000 1 20.7 3.0 4.1 0.6 10.4 1.5 14.5 2.1 100 2 41.4 6.0 8.3 1.2 20.7 3.0 29.0 4.2 100 3 69.0 10.0 13.8 2.0 34.5 5.0 48.3 7.0 100 4 103.5 15.0 20.7 3.0 51.8 7.5 72.5 10.5 100 5 138.0 20.0 27.6 4.0 69.0 10.0 96.6 14.0 100 6 20.7 3.0 4.1 0.6 20.7 3.0 24.8 3.6 100 7 41.4 6.0 8.3 1.2 41.4 6.0 49.7 7.2 100 8 69.0 10.0 13.8 2.0 69.0 10.0 82.8 12.0 100 9 103.5 15.0 20.7 3.0 103.5 15.0 124.2 18.0 100 10 138.0 20.0 27.6 4.0 138.0 20.0 165.6 24.0 100 11 20.7 3.0 4.1 0.6 41.4 6.0 45.5 6.6 100 12 41.4 6.0 8.3 1.2 82.8 12.0 91.1 13.2 100 13 69.0 10.0 13.8 2.0 138.0 20.0 151.8 22.0 100 14 103.5 15.0 20.7 3.0 207.0 30.0 227.7 33.0 100 15 138.0 20.0 27.6 4.0 276.0 40.0 303.6 44.0 100 16 20.7 3.0 4.1 0.6 62.1 9.0 66.2 9.6 100 17 41.4 6.0 8.3 1.2 124.2 18.0 132.5 19.2 100 18 69.0 10.0 13.8 2.0 207.0 30.0 220.8 32.0 100 19 103.5 15.0 20.7 3.0 310.5 45.0 331.2 48.0 100 20 138.0 20.0 27.6 4.0 414.0 60.0 441.6 64.0 100 21 20.7 3.0 4.1 0.6 103.5 15.0 107.6 15.6 100 22 41.4 6.0 8.3 1.2 207.0 30.0 215.3 31.2 100 23 69.0 10.0 13.8 2.0 345.0 50.0 358.8 52.0 100 24 103.5 15.0 20.7 3.0 517.5 75.0 538.2 78.0 100 25 138.0 20.0 27.6 4.0 690.0 100.0 717.6 104.0 100 26 20.7 3.0 4.1 0.6 144.9 21.0 149.0 21.6 100 27 41.4 6.0 8.3 1.2 289.8 42.0 298.1 43.2 100 28 69.0 10.0 13.8 2.0 483.0 70.0 496.8 72.0 100 29 103.5 15.0 20.7 3.0 724.5 105.0 745.2 108.0 100 30 138.0 20.0 27.6 4.0 966.0 140.0 993.6 144.0 100 Maximum StressCyclic StressContact StressConfining Pressure 9.
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27 τ σ σ σ σ σ σoct = ⋅ −( )
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30 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.
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