Polymeric Aggregate Treatment System Tables

TABLES AND FIGURES

Table 1.  Stockpile percentages and gradations for Lockwood aggregate.

Sieve Size Stockpiles and Percentages
19.0 mm
(30%)
12.5 mm
(15%)
9.5 mm
(10%)
Rock Dust
(35)
Bank Sand
(10%)
Blend
25 100 100 100 100 100 100
19 98.7 100 100 100 100 99.6
12.5 24.4 97.6 100 100 100 77.0
9.5 2.0 36.1 97.0 100 100 60.7
4.75 0.8 0.9 21.1 97.0 100 46.4
2.36 0.6 0.4 2.2 66.2 100 33.6
1.18 0.5 0.3 1.2 41.1 99.7 24.7
0.6 0.5 0.3 1.0 26.6 92.8 18.9
0.3 0.5 0.3 0.9 18.2 55.3 12.2
0.15 0.5 0.3 0.8 13.3 18.9 6.8
0.075 0.5 0.3 0.7 10.3 6.8 4.6

 

Table 2.  Stockpiles percentages and gradations for Elko aggregate.

Sieve Size (mm) Stockpiles and Percentages
Coarse
(28%)
Medium
(8.0%)
Crushed Fines
(54%)
Natural Fines
(10)
Blend
25 100 100 100 100 100
19 100 100 100 100 100
12.5 90.0 100 100 100 97.1
9.5 36.0 97.0 100 98.0 81.6
4.75 7.0 7.0 83.0 77.0 55.0
2.36 3.0 3.0 56.0 61.0 37.4
1.18 2.0 2.0 37.0 45.0 25.2
0.6 2.0 1.0 25.0 28.0 16.9
0.15 1.0 1.0 13.0 8.0 8.2
0.075 1.0 1.0 10.0 6.0 6.4

 

Table 3.  Physical properties of the aggregates.

Fraction Specific Gravity
(bulk)
Absorption Capacity
(%)
Uncompacted Void Content Sand Equivalent Fractured Face Flat & Elongated
(%)
Criteria* 45 min. 40 min. 75 min. 10 max.
Lockwood Aggregate
Coarse 2.665 2.19 100 0.2
Fine 2.628 1.77 56.2 75.3
Elko Aggregate
Coarse 2.705 2.42 97.2 0.7
Fine 2.839 1.91 55.0 78.1

* Superpave criteria based on less than 3 million ESALs and 100 mm of depth from surface.

Table 4.  Laboratory testing program.

Aggregate Antistrip Additive
None UP-5000
0.75 lb/ton
UP-5000
1.0 lb/ton
UP-5000
1.5 lb/ton
Hydrated Lime
1.5%
Lockwood ML L ML L ML
Elko ML L ML L ML

M:  Hveem Mix Design
L:   Mr at three temperatures plus Mr and TS at the wet and dry stages.

Table 5. Summary of the mixtures volumetric properties at optimum asphalt contents with Hveem compaction.

Additive Optimum AC
(%DWA)
Air Voids
(%)
Stability VMA
(%)
Superpave
Criterion
VFA
(%)
Superpave*
Criterion

Lockwood Aggregate Source

None 5.75 4.0 40 14.5 min 13 72 65-75
Lime ** 5.75 4.0 40 14.8 min 13 72 65-75
UP_500*** 4.90 4.0 39 13.3 min 13 71 65-75
Elko Aggregate Source
None 6.25 4.0 37 16.8 min 14 75 65-75
Lime 6.50 5.0 41 16.8 min 14 69 65-75
UP-5000 6.10 4.3 39 16.8 min 14 75 65-75

*    Superpave criterion for traffic level of 3 million ESALs.
**    Lime at 1.5% by dry weight of aggregate
***    UP-5000 at 1.0 lb/ton of dry aggregate

Table 6.  Tensile strength properties of the Lockwood mixtures.

Aggregate/
Addititve
Unconditioned Mixtures Conditioned Mixtures
Air Voids (%) Tensile Strength
at 77°F (psi)
Air Voids (%) Tensile Strength
at 77°F (psi)
Lockwood / None 6.8 68.0 6.6 48.3
Lockwood / Lime
at 1.5 percent
6.4 67.5 6.4 68.6
Lockwood / UP-5000
at 0.75 lb/ton
7.3 86 7.3 68.6
Lockwood / UP-5000
at 1.0 lb/ton
6.4 93.5 6.9 75.1
Lockwood / UP-5000
at 1.5 lb/ton
7.1 81.1 6.6 81.5

Table 7. Resilient modulus properties of the Lockwood mixtures.

Aggregate /
Additive
Unconditioned Mixtures Conditioned Mixtures
Air Voids (%) Resilient Modulus
at 77°F (ksi)
Air Voids (%) Resilient Modulus
at 77°F (ksi)
Lockwood / None 6.8 169 6.6 127
Lockwood / Lime
at 1.5 percent
6.4 156 6.4 156
Lockwood / UP-5000
at 0.75 lb/ton
6.3 190 6.3 147
Lockwood / UP-5000
at 1.0 lb/ton
6.1 178 6.1 149
Lockwood / UP-5000
at 1.5 lb/ton
6.0 231 6.0 205

 

Table 8. Tensile strength properties of the Elko mixtures.

Aggregate/
Addititve
Unconditioned Mixtures Conditioned Mixtures
Air Voids (%) Tensile Strength
at 77°F (psi)
Air Voids (%) Tensile Strength
at 77°F (psi)
Elko / None 7.1 62.2 7.1 36.3
Elko / Lime
at 1.5 percent
6.8 68.9 7.0 52.7
Elko / UP-5000
at 0.75 lb/ton
7.1 76.1 7.2 54.6
Elko / UP-5000
at 1.0 lb/ton
6.8 78.8 7.0 57.4
Elko / UP-5000
at 1.5 lb/ton
6.9 76.4 6.9 63.6

Table 9. Resilient modulus properties of the Elko mixtures.

Aggregate /
Additive
Unconditioned Mixtures Conditioned Mixtures
Air Voids (%) Resilient Modulus
at 77°F (ksi)
Air Voids (%) Resilient Modulus
at 77°F (ksi)
Elko / None 7.1 242 7.1 89
Elko / Lime
at 1.5 percent
6.9 176 6.9 151
Elko / UP-5000
at 0.75 lb/ton
7.2 194 7.2 118
Elko / UP-5000
at 1.0 lb/ton
7.0 175 7.0 117
Elko / UP-5000
at 1.5 lb/ton
6.9 179 6.9 124

 

Table 10. Retained strength ratios for all mixtures.

Additive Lockwood Aggregate Source Elko Aggregate Source
TS Ratio (%) Mr Ratio (%) TS Ration (%) Mr Ratio (%)
None 71 75 58 37
Lime at
1.5 Pecent
100 100 76 86
UP-5000 at
0.75 lb/ton
80 77 72 61
UP-5000 at
1.0 lb/ton
80 84 73 67
UP-5000 at
1.5 lb/ton
100 89 83 70