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Publication Number: FHWA-HRT-04-079
Date: July 2006

Seasonal Variations in The Moduli of Unbound Pavement Layers

Appendix G: Trial Application Results Obtained With One-Date Section/Layer-Specific Models

Figure 61. Section 040113 (Arizona) E versus E predicted for section-specific models based on data for a single test date

Figure 61. Graph. Section 040113 (Arizona) E versus E subscript predicted for section-specific models based on data for a single test date. The backcalculated modulus is graphed on the horizontal axis from 0 to 500 megapascals. The predicted modulus is graphed on the vertical axis from 0 to 500 megapascals. There are three layers: layers 2, 3, and 4. The subgrade error is at a minimum confidence of 95 percent and the base error is at the maximum confidence of 95 percent. Layer 3 is tightly clustered at backcalculated modulus of 70-100 megapascals at predicted modulus of 50-100 megapascals. Layer 2 is scattered between a backcalculated modulus of 100-200 megapascals and a predicted modulus of 125-425 megapascals. Layer 4 is tightly clustered at a backcalculated modulus of 120-160 megapascals and at a predicted modulus of 150 megapascals. Both layers 3 and 4 are plotted within the subgrade error band and have a strong correlation.

Figure 62. Section 091803 (Connecticut) E versus E predicted for section-specific models based on data for a single test date

Figure 62. Graph. Section 091803 (Connecticut) E versus E subscript predicted for section-specific models based on data for a single test date. The backcalculated modulus is graphed on the horizontal axis from 0 to 600 megapascals. The predicted modulus is graphed on the vertical axis from 0 to 600 megapascals. There are three layers: layers 2, 3, and 4. The subgrade error is at a minimum confidence of 95 percent and the base error is at the maximum confidence of 95 percent. All three layers are scattered across the graph from backcalculated modulus of 100-400 megapascals and predicted modulus of 100-600 megapascals. All three layers are plotted outside of the base band error and thus have a weak correlation.

Figure 63. Section 271018 (Minnesota) E versus E predicted for section-specific models based on data for a single test date (A (top) and B (bottom))

Figure 63. Graphs. Section 271018 (Minnesota) E versus E subscript predicted for section-specific models based on data for a single test date (A-top and B-bottom). There are two graphs shown (A and B). On both graphs, the backcalculated modulus is graphed on the horizontal axis from 0 to 400 megapascals, and the predicted modulus is graphed on the vertical axis from 0 to 400 megapascals. There are three layers: layers 2, 3, and 4. The subgrade error is at a minimum confidence of 95 percent and the base error is at the maximum confidence of 95 percent. Layer 3 has a few plots overlapping each other for both graph A and graph B at a modulus of 40 megapascals. Layer 2 has a few plots scattered throughout graph A. In graph B, layer 2 has 4 plots on backcalculated modulus 140-200 megapascals at predicted modulus of 150 megapascals. Layer 3 remains within the subgrade error band for both graph A and B. Layers 3 and 4 for both A and B, and layer 2 in graph B, have a strong correlation and remain within the base and subgrade error band.

Figure 64. Section 481077 (Texas) E versus E predicted for section-specific models based on data for a single test date

Figure 64. Graph. Section 481077 (Texas) E versus E subscript predicted for section-specific models based on data for a single test date. The backcalculated modulus is graphed on the horizontal axis from 0 to 800 megapascals. The predicted modulus is graphed on the vertical axis from 0 to 800 megapascals. There are two layers: layers 2 and 3. The subgrade error is at a minimum confidence of 95 percent and the base error is at the maximum confidence of 95 percent. Layer 3 is plotted within the base error band and is in a tight cluster on backcalculated modulus of 100-250 megapascals and predicted modulus of 125-250 megapascals. Layer 2 is loosely clustered on backcalculated modulus 200-500 megapascals at 225-500 megapascals. Layer 3 has a strong correlation between backcalculated modulus and predicted modulus.

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