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RATIONAL DETERMINATION OF PAVEMENT LAYER
STRUCTURAL COEFFICIENTS
| 题名： | RATIONAL DETERMINATION OF PAVEMENT LAYER STRUCTURAL COEFFICIENTS |
| 作者： | Eddie (Y J.) Chou. Brian Randolph, Andrew Heydinger |
| 关键词： | Structural Coefficient, Flexible Pavements, Resilient Modulus |
| 摘要： | Seven flexible pavements ranging from interstate to state route are selected. Three different approaches are employed. The first two use the resilient modulus of the material to estimate its structural coefficient. In the first approach, cored specimens are obtained from each of the pavement sections and the resilient modulus of in-service 301 and 440/448 materials are determined in the laboratory. The resulting structural coefficient for 301 materials ranges between 0.33 and 0.39 with an average of 0.37. The structural coefficient of 446/448 materials ranges between 0.46 to 0.54 with an average value of 0.49. The second approach back calculates layer elastic modulus from measured pavement deflection. The resulting structural coefficients are 0.44 for 301 materials (range: 0.25~0.53) and 0.55 for 446 materials (range: 0.38-0.60). The third approach determines the structural coefficient from the AASHTO flexible pavement performance equation based on traffic and serviceability history data. When laboratory measured roadbed soil resilient modulus are used, the average coefficient is 0.42 for 301 materials and 0.52 for 446 materials. When back calculated roadbed modulus values (multiplied by a factor 0f 0.33) are used, the average coefficient is 0.30 for 301 and 0.43 for 446 materials. Finally, when the soil modulus is estimated from The group index, the average structural coefficient is 0.39 for 446/448 and 0.26 for 301 materials. The findings of this study indicate that the structural coefficient for 446 materials may be increased from the current value of 0.35 to a value between 0.40 and 0.45. For 301 materials, a structural coefficient of between 0.35 and 0.37 is recommended. |
| 报告类型： | 科技报告 |
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