MSCR: Jnr, percent recovery and M 332 grade

AASHTO T 350 · AASHTO M 332 · ASTM D7405

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MSCR: J_nr, percent recovery and M 332 grade

AASHTO T 350 · AASHTO M 332 · ASTM D7405

Enter the strains from the DSR’s twenty creep and recovery cycles, or the averages it reports. The grade is set by Jnr at 3.2 kPa, tested at the climate’s high temperature.

Results to enter

Strain entered as

Binders strain a lot in this test: a Jnr3.2 of 1.0 kPa⁻¹ is 3.2, or 320 %, of unrecovered strain per cycle.

Cycles at 0.1 kPa
Cycle	Start, ε₀	End of creep, ε_c	End of recovery, ε₁₀
1
2
3
4
5
6
7
8
9
10

Accumulated strain, as the DSR records it. T 350 averages all ten cycles.

Cycles at 3.2 kPa
Cycle	Start, ε₀	End of creep, ε_c	End of recovery, ε₁₀
1
2
3
4
5
6
7
8
9
10

Test temperature

The climate’s high pavement temperature grade. Heavier traffic lowers the Jnr allowed, not the temperature.

Low temperature grade

From the BBR. Only used to write out the full grade.

Specification

Maximum J_nr,diff, % (optional)

M 332 as HIF-11-038 Table 1 gives it: 75 % for every traffic grade.

Maximum J_nr at 3.2 kPa, kPa⁻¹ (optional)

Optional: the grade your project calls for (S 4.0, H 2.0, V 1.0, E 0.5).

Example values: a made-up polymer-modified binder tested at 64 °C.

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