Gyratory densification: %Gmm at Nini, Ndes and Nmax

AASHTO T 312 · AASHTO R 35 · AASHTO M 323

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Gyratory densification: %G_mm at N_ini, N_des and N_max

AASHTO T 312 · AASHTO R 35 · AASHTO M 323

Enter the heights the gyratory compactor recorded and the bulk specific gravity of the specimen after it came out. The last height in the table is the one Gmb was measured at. Enter the %Gmm limits from your project specification to check them.

Theoretical maximum specific gravity, G_mm

From AASHTO T 209 on the same mix.

Bulk specific gravity of the extruded specimen, G_mb

Measured (T 166) after compaction to the last height in the table.

Specimen height by gyration
Reading	Gyrations	Height, mm
1
2
3
4
5
6
7
8

At least Nini and the final gyration. Add Ndes, and Nmax if you compacted that far, or any other gyrations to see the curve.

Gyration levels

N_initial

M 323 by design traffic: 6, 7, 8 or 9 for under 0.3, 0.3 to 3, 3 to 30, and 30 or more million ESALs.

N_design

50, 75, 100 or 125 for the same traffic levels.

N_maximum

75, 115, 160 or 205 for the same traffic levels.

Specification

Maximum %Gmm at N_initial, % (optional)

From the project specification. Leave the limits blank to report the values without a check.

Minimum %Gmm at N_design, % (optional)

The low end of the project specification’s band at Ndesign.

Maximum %Gmm at N_design, % (optional)

The high end of the same band.

Maximum %Gmm at N_maximum, % (optional)

From the project specification.

Example values: a made-up 12.5 mm mix compacted to Nmax for 3 to 30 million ESALs.

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