2350 Mix Requirements

Full specification available from Mn/Road

1. Materials
2. Required Density
3. Profilograph
4. General Notes
5. Aggregates

This specification was implemented in 1998, and replaces the older specifications 2331 and 2340. It is required on all Mn/DOT projects with traffic greater than 3 million ESAL's. The 2350 specification introduces additional mix quality indicators, and rewards high quality. It offers improved quality and durability, greater density and improved mixture uniformity over the 2331 and 2340 mixtures.

This mixture can be used for both wear and non-wear application. Mixtures are designated by traffic classifications broken down into Low, Medium and High volume roadways (LV, MV, HV) as follows:

Table 1: 2350 Mixture Designations based on Traffic

Traffic Designation	Traffic (ESALs)	Aggregate	Design and Production Control
LV	<1 million	No crushing requirements	Voids 3.0% (50 blow Marshall) Stability 5000 N TSR 70.0% VMA gradation dependent Fines/Effective Asphalt
MV	1-3 million	Crushing: +4 material: 55% 1 fractured face -4 material: 25% crushed fines	Voids 3.5% (50 blow Marshall) Stability 6000N TSR 70.0% VMA gradation dependent Fines/Effective Asphalt
HV	>3 million	Crushing: +4 material: Min. 85% 1 fractured face Min. 60% 2 fractured face -4 material: 75% must be manufactured sand	Voids 4.0% (75 blow Marshall) Stability 5000 N TSR 70.0% VMA gradation dependent Fines/Effective Asphalt

All bituminous mixtures must be supplied by a certified plant.

1. Materials

Table 2: 2350 Materials Requirements

Item	Payment % of bid price
Crushing	95%
Gradation	90%
VMA	85%
Asphalt content	85%
Air voids	70%

Note: lowest single payment applies. Any material produced outside the JMF limit will be removed and replaced or at the discretion of the Engineer, accepted at substantial reduced pay.

2. Required Density

For all mixes, pavement located in the traffic lanes must be compacted to 91.5%. The minimum is reduced by 1.0% for the following conditions:

first lift on an aggregate base
on cold recycled base course
on the first lift of an overlay on a roadway with 7-ton or less spring load restriction, and
on the first lift of a PCC overlay with faulted and cracked panels

Traffic lanes may include the parking lanes, as determined by the Engineer.

3. Profilograph

Table 3. 2350 Design Criteria

20 yr. ESAL's Design Lane x 106		Non Wear >75 mm (3") from surface	Non Wear >40 mm<=75 mm (>1.5" <=3") from surface	Wear <40 mm (1.5") from surface
<1 and Shoulders (AADT<=2300)	Specify	LVNW35030^6	LVNW35030^6	LVWE35030^6
<1 and Shoulders (AADT<=2300)	Contractor's Option to Supply	Agg. size 1, 2, 4	Agg. Size 4	Agg. Size 4
1 - 3 2300<6000	Specify	LVNW35030^6	MVNW35035^6	MVNW35035^6
1 - 3 2300<6000	Contractor's Option to Supply	Agg. size 1, 2, 4	Agg. Size 4	Agg. Size 4
>3 (AADT>=6000)	Specify	MVNW35035^6	LVNW37540^6	HVWE37540^6
>3 (AADT>=6000)	Contractor's Option to Supply	Agg. Size 4	Agg. Size 4	Agg. Size 4

4. General Notes

1. All wear courses shall be 40mm (1-1/2") thick minimum.

2. Aggregate sizes specified and Contractor options should be used unless lift thickness precludes large aggregate otherwise specified. Minimum lift thickness is twice the maximum particle size, except as noted in 1 above.

3. Specify aggregate size 3, 4 when course/lift is less than 40 mm (1-1/2").

4. Specify aggregate size 5 for thin lift leveling identified as 18 mm (3/4") or less.

5. The term Wear applies to all wearing courses (mainline and shoulder).

6. For mainline paving select asphalt binder grade from Tech. Memo No. 99-03-MRR-01. For shoulders where traffic allowed, use the same binder grade as the mainline. For shoulders where traffic is prohibited, select either PG 52-34 or PG 58-28 by matching with the mainline low PG number. (i.e., for mainline PG 64-28, shoulder binder is PG 58-28.)

7. For slow and standing traffic, consider selecting a higher high temperature binder grade and/or mix type.

5. Aggregates

All gradations are now based on +4 and -4 washed gradations.
Size A (1-1/2" minus) and B (3/4" minus) replaced by gradations 1, 2, 3, and 4 as follows:

Table 4. 2350 Gradation Applications

Gradation	Use	Aggregate Gradation
1	Non wear	1-1/2" minus
2	Non wear	1" minus
3	Wear and non wear	3/4" minus
4	Wear	1/2" minus
5	Wear Specialty	3/8" minus