**Homework Assignment No. \-\-- A.**

**Superpave Mix Design Calculations**

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

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

Project information:

ESAL's = 1.56 million

Mix is being designed for the top lift (i.e. top 50 mm of the pavement)

Binder and Aggregate information:

G~b~ = 1.030

G~se~ = 2.723

G~sb~ = 2.699

P~ba~ = 0.34

\% passing 0.075 mm sieve = 3.0%

Nominal maximum size = 19.0 mm

1.  Use the information in the text book, the equations in the class
    notes and the information provided above to complete the attached
    Tables 1,2, and 3 below. Attach all calculations.

2.  Use the information calculated for Table 3 to construct the six
    graphs needed for a Superpave mix design.

3.  Identify the appropriate design criteria on each graph. Select an
    optimum asphalt content. Indicate on each graph if your selection
    meets the criteria.

**TABLE 1. Initial Calculations.**

  ---------- -------- ------------ ----------- -------- ------------ ----------- --------
  Asphalt    Sample   Sample                            Volumes,                 
  Content, % No.      heights in                        cm^3^                    
                      mm at:                                                     

                      N~initial~   N~design~   N~max~   N~initial~   N~design~   N~max~

  3.5        1        121.2        113.0       112.0                             

             2        120.1        112.5       111.5                             

  4.0        1        120.4        112.6       111.6                             

             2        120.0        112.0       111.0                             

  4.5        1        120.5        112.2       111.2                             

             2        119.5        111.5       110.5                             

  5.0        1        121.3        113.0       112.1                             

             2        119.9        111.9       111.0                             
  ---------- -------- ------------ ----------- -------- ------------ ----------- --------

**TABLE 2. Correction of Estimated Specific Gravity Values.**

  ---------- -------- ------------ ----------- -------- ------------ ------------ -------- ------------ ----------- -------- -----
  Asphalt    Mass in  Estimated                         G~mb~ at     Correction                         \% G~mm~             
  Content, % mold, g  G~mb~                             N~max~       Factor, C                                               

                      N~initial~   N~design~   N~max~   N~initial~   N~design~    N~max~   N~initial~   N~design~   N~max~   

  3.5        4765.3                                     2.431                                                                

             4767.3                                     2.432                                                                

  4.0        4782.0                                     2.448                                                                

             4774.2                                     2.450                                                                

  4.5        4805.3                                     2.469                                                                

             4789.9                                     2.466                                                                

  5.0        4836.1                                     2.473                                                                

             4838.9                                     2.479                                                                
  ---------- -------- ------------ ----------- -------- ------------ ------------ -------- ------------ ----------- -------- -----

**TABLE 3. Properties at N~design~.**

  ----------- --------- ----------- ------------ ---------- --------- ---------
  Asphalt     Sample    \%          Dust         Air Voids, VMA, %    VFA, %
  Content, %  No.       Effective   Proportion   %                    
                        Asphalt,                                      
                        P~be~                                         

  3.5         1                                                       

              2                                                       

  4.0         1                                                       

              2                                                       

  4.5         1                                                       

              2                                                       

  5.0         1                                                       

              2                                                       
  ----------- --------- ----------- ------------ ---------- --------- ---------