Quantifying the Influence of Geosynthetics on Pavement Performance (2017) / Chapter Skim
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Pages 573-586
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L-1 APPENDIX L CHARACTERIZATION OF MATERIALS USED IN LARGE-SCALE TANK TEST Materials for the flexible and rigid pavements included typically used materials for dense-graded hot-mix asphalt (HMA)
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L-2 The shear strength parameters of the subgrade material were also determined. Direct shear testing was conducted on three sample replicates subjected to different normal stresses in accordance with ASTM D3080.
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L-3 7 minutes each were made to yield a 3-inch compacted lift. To assure the required 95 percent compaction was being reached, nuclear density gauge readings were taken at the 1-, 2-, and 3-ft levels in the LST.
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L-4 Base Layer A typical dense-graded crushed aggregate base was used in the LST experiments. The same material was used for all flexible and rigid pavement testing.
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L-5 Table L-3. Gradation for Crushed Aggregate Base Material Sieve Size Percent Passing Lower Limit Specification Upper Limit Specification 1 inch 100 100 100 3/4 inch 97 90 100 1/2 inch 86 - - 3/8 inch 68 - - No.
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L-6 Table L-4. Results of Rapid Triaxial Tests for Base Materials Used in Large-Scale Tank Test σ1 (kPa)
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L-7 even surface for the geosynthetic to contact. A 9-ft by 9-ft square section of geosynthetic was cut from the roll and then laid over the top of the tank.
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L-8 Figure L-7. Relationships between Tensile Force and Tensile Strain for Geosynthetics Asphalt Concrete Layer A typical dense-graded HMA with a PG 64-22 unmodified asphalt binder was used in all flexible pavement experiments.
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L-10 Figure L-9. Coring of the asphalt concrete layer in the LST Table L-8.
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L-12 Portland Cement Concrete Layer The testing for rigid pavement in LST consisted of a half-slab PCC in order to allow for the measurements of slippage at the interface between the bottom of the PCC slab and the supporting base layer, as well as the deflection at the pavement edge. These two measurements were needed for modeling the properties of the composite concrete-base surface layer.
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L-13 Figure L-12. LST top view for rigid pavement with irrigation system The specification for a typical PCC material used for roadway paving was selected for the LST experiments.
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L-14 Table L-9. Mix Design Requirements for PCC Material Test Test Method Requirements Water to Cementitious Ratio - 0.45 Maximum Flexural Strength at 28 Days (psi)
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