Aggregate blend: combined gradation and Gsb

AASHTO R 35 · AASHTO M 323 · AASHTO T 27 · AASHTO T 84 · AASHTO T 85

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Aggregate blend: combined gradation and G_sb

AASHTO R 35 · AASHTO M 323 · AASHTO T 27 · AASHTO T 84 · AASHTO T 85

Enter each stockpile’s share of the blend and its gradation. The combined gradation and the combined bulk specific gravity are mass-weighted.

Blend percentages are

Blend by volume when the stockpile gravities differ by more than 0.300, as with lightweight aggregate (Tex-204-F Part II).

Stockpiles
Stockpile	Percent of blend, %	Bulk specific gravity, G_sb	Absorption, %
1
2
3
4
5
6

Rows A to F, in the same order as the gradation columns. The percentages must add up to 100. Gsb and absorption are optional unless you blend by volume.

Percent passing for each stockpile
Sieve	Sieve opening, mm	Stockpile A, %	Stockpile B, %	Stockpile C, %	Stockpile D, %	Stockpile E, %	Stockpile F, %
1
2
3
4
5
6
7
8
9
10

One row per sieve, opening in millimeters (19, 12.5, 9.5, 4.75, 2.36, 1.18, 0.6, 0.3, 0.15, 0.075). Leave a stockpile’s column blank if it isn’t in the blend.

Maximum aggregate size, D, mm (optional)

Where the maximum density line on the chart ends at 100 percent. Superpave uses one sieve larger than the nominal maximum size. Blank uses the finest sieve the whole blend passes.

Specification

Specification band, percent passing
Limit	Sieve opening, mm	Minimum, %	Maximum, %
1
2
3
4
5
6

Optional: your agency’s master gradation or control points, checked against the combined gradation to 0.1 percent and drawn on the chart as bars.

Example values: a made-up four-stockpile surface mix. Your specification sets the band.

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