image-asphalt texture

STANDARD SPECIFICATIONS
Superpave Asphalt Mix - Combined Aggregate Grading

AASHTO M 325-08

Standard Specifications for Aggregates

Superpave Asphalt Mix - Combined Aggregate Grading

Standard AASHTO M 325-08

AASHTO M 323-13 standard specifies minimum quality requirements for binder, aggregate, and asphalt mixtures for Superpave volumetric mix design.

Nominal Maximum Aggregate Size - One size larger than the first sieve that retains more than 10 percent aggregate.
Maximum Aggregate Size - One size larger than the nominal maximum aggregate size.
Nominal maximum aggregate size of the combined aggregate shall be 4.75 to 19.0 mm for HMA surface courses and not larger than 37.5 mm for HMA subsurface courses. When tested according to AASHTO T 11 and AASHTO T 27, the combined aggregate shall conform to the gradation requirements specified in the adjacent input table.
The combined aggregate gradation is classified as coarse-graded/fine-graded based on the Primary Control Sieve (PCS).The combined aggregate gradation is classified as coarse-graded when it passes below the PCS control point as defined below. All other gradations are classified as fine-graded.
  • For nominal maximum aggregate size of 37.5 mm; PCS = 9.5 mm and % Passing PCS control point = 47%.
  • For nominal maximum aggregate size of 25.0 mm; PCS = 4.75 mm and % Passing PCS control point = 40 %.
  • For nominal maximum aggregate size of 19.0 mm; PCS = 4.75 mm and % Passing PCS control point = 47 %.
  • For nominal maximum aggregate size of 12.5 mm; PCS = 2.36 mm and % Passing PCS control point = 39 %.
  • For nominal maximum aggregate size of 9.5 mm; PCS = 2.36 mm and % Passing PCS control point = 47 %.

Input - Project & Sample Details

Please enter the Project Details to appear on the generated pdf report.

Please enter the plot title to appear on the generated particle size distribution (PSD) plot.

Please enter the plot subtitle to appear on the PSD plot.

Please select the nominal maximum aggregate size (mm) of the sample.

Please enter the Sample Details to appear on the generated pdf report.

Please enter the sample name to appear on the PSD plot and in the generated pdf report.

Please enter brief remarks to appear on the generated pdf report.


Combined Aggregate Gradation Control Points: Input Table

Sieve Size, mm Perc. Passing
Sample
37.5 mm nominal size
UL
37.5 mm nominal size
LL
25.0 mm nominal size
UL
25.0 mm nominal size
LL
19.0 mm nominal size
UL
19.0 mm nominal size
LL
12.5 mm nominal size
UL
12.5 mm nominal size
LL
9.5 mm nominal size
UL
9.5 mm nominal size
LL
4.75 mm nominal size
UL
4.75 mm nominal size
LL
50.0 100
37.5 100 90 100
25.0 90 100 90 100
19.0 90 100 90
12.5 90 100 90 100 100
9.5 90 100 90 100 95
4.75 90 100 90
2.36 41 15 45 19 49 23 58 28 67 32
1.18 55 30
0.075 6 0 7 1 8 2 10 2 10 2 13 6

PARTICLE SIZE GRADING COMPARISON - CHART

0.45 POWER CHART



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