Performance-Related Tests of Recycled Aggregates for Use in Unbound Pavement Layers (2008) / Chapter Skim
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11 Selection and Description of Test Methods Laboratory tests are used to characterize aggregates as a construction material, to ensure specification compliance, and to evaluate the strength and durability properties. A number of laboratory tests have been developed, mostly along empirical lines, to estimate performance and to identify potentially poor performers.
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12 Property measured Test Performance predictabilit y Accuracy Practi- cality Com- plexity Precision Cost Composite Static Triaxial Shear F G H FS G M H Repeated Load Triaxial G G H C G M H Texas Triaxial F G M FS F M M Illinois Rapid Shear F - G G M FS G M M – H Confined Compression F F M S F L M Direct Shear F F L FS F M M Gyratory Shear F F M C F M M k-Mould G G M C F M M CBR F F M S F L M Hveem Stabilometer F F M S F L M Hollow Cylinder G G L VC L H L Dynamic Cone Penetrometer F F M S F L M Shear Strength Lab Rut-Tester G F L C F H M Resilient Modulus G G H C G M H Var.
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13 Table 3.3. Stress control for repeated load triaxial test.
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eters, conducting a full MR test to determine the stiffness as a function of the state-of-stress is not necessary. The saturation phase of the saturated repeated load triaxial tests provides a measure of material permeability.
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15 of the expressway was built during the early to mid-1960s. The constitutive aggregate may have been dolomite (a double carbonate of calcium and magnesium [CaMg(CO3)
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16 Sieve Size Percent passing (percent finer)
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17 0 10 20 30 40 50 60 70 80 90 100 0.0010.010.1110 Sieve Size Opening (inch) Pe rc en t P as si ng RCP-GR-SC South Carolina DOT RCA Gradation Figure 3.6.
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Figure 3.8. RAP-LS-MS as-received and Mississippi DOT aggregate gradations.
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Figure 3.11. Photograph of RAP-GR-CO material used for laboratory testing.
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