**Homework Assignment \-\--B**

**Superpave PG Grading Systems**

Name:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

Date:\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

1.  Use the Superpave software provided to determine the average 7 day
    high and 1-day minimum low pavement temperature and standard
    deviations for the following locations.

-   San Antonio, Texas

-   Denver, Colorado

-   International Falls, Minnesota

-   Chattanooga, Tennessee

-   Washington, D.C.

2.  Select a PG grade to use in each of the above locations. Use the
    maximum and minimum temperatures plus 2 standard deviations.

3.  What is the PG grade of the asphalt whose results are shown in Table
    1?

**TABLE 1. Asphalt Cement Test Results.**

+---------------------------------------------+------------------------+
| Properties                                  | Asphalt No. 1          |
+---------------------------------------------+------------------------+
| Original Properties                         |                        |
+---------------------------------------------+------------------------+
| Flash point temperature, ^o^C               | 278                    |
+---------------------------------------------+------------------------+
| Viscosity at 135^o^C                        | 0.490 Pa.s             |
+---------------------------------------------+------------------------+
| Dynamic shear                               | 0.88                   |
|                                             |                        |
| G\*/ sin δ at 70^o^C                        | 1.25                   |
|                                             |                        |
| G\*/ sin δ at 76^o^C                        | 2.10                   |
|                                             |                        |
| G\*/ sin δ at 82^o^C                        |                        |
+---------------------------------------------+------------------------+
| Rolling Thin Film Oven Aged Binder          |                        |
+---------------------------------------------+------------------------+
| Dynamic shear                               | 1.88                   |
|                                             |                        |
| G\*/ sin δ at 70^o^C                        | 2.64                   |
|                                             |                        |
| G\*/ sin δ at 76^o^C                        | 4.10                   |
|                                             |                        |
| G\*/ sin δ at 82^o^C                        |                        |
+---------------------------------------------+------------------------+
| Rolling Thin Film Oven and PAV Aged Binder  |                        |
+---------------------------------------------+------------------------+
| Dynamic shear                               | 2358                   |
|                                             |                        |
| G\* sin δ at 28^o^C                         | 3107                   |
|                                             |                        |
| G\* sin δ at 31^o^C                         | 4009                   |
|                                             |                        |
| G\* sin δ at 34^o^C                         |                        |
+---------------------------------------------+------------------------+
| Creep Stiffness                             | [S                     |
|                                             | m-value]{.underline}   |
| Stiffness and m-value at -6^o^C             |                        |
|                                             | 255 0.329              |
| Stiffness and m-value at -12^o^C            |                        |
|                                             | 290 0.305              |
| Stiffness and m-value at -18^o^C            |                        |
|                                             | 318 0.277              |
+---------------------------------------------+------------------------+