Input - Project & Sample Details
Asphalt Mix Production Control Charts
Daily Variation of Perc. Asphalt Binder Content
AASHTO M 325-08 specification covers the design of Stone Matrix Asphalt (SMA) using the Superpave gyratory compactor (SGC), based on the volumetric properties of the SMA in terms of air voids (Va), voids in mineral aggregate (VMA), and the presence of stone-on-stone contact.
Hot Mix Asphalt (HMA) consisting of a coarse aggregate skeleton with coarse aggregate-on-coarse aggregate contact (stone-on-stone contact) and a rich asphalt binder mortar. The coarse aggregate is generally considered to be that fraction of the aggregate retained on the 4.75-mm (No. 4) sieve but may be designated as other sizes.
Total volume of the small pockets of air between the coated aggregate particles throughout a compacted paving mixture, expressed as a percent of the bulk volume of the compacted paving mixture.
The volume of the intergranular void space between the aggregate particles of a compacted paving mixture that includes the air voids and the effective binder content, expressed as a percent of the total volume of the specimen.
The volume between the coarse aggregate particles, which includes the volume of filler, fine aggregate, air voids, asphalt binder, and stabilizing additive (if used).
A mixture of asphalt binder, filler (material passing the 0.075-mm (No. 200) sieve), and stabilizing additive.
Either cellulose or mineral fiber.
The asphalt binder shall be a performance grade meeting the requirements of AASHTO M 320. The selected binder shall be appropriate for the climate and traffic-loading conditions at the site of the paving project.
Coarse aggregates shall be 100 percent crushed and conform to the quality requirements given in table below.
| Test | Method | Minimum | Maximum |
|---|---|---|---|
| Los Angeles (L.A.) abrasion,% loss | AASHTO T 96 | --- | --- |
| Flat and Elongated, % (3:1) | ASTM D 4791 | --- | 20 |
| Flat and Elongated, % (5:1) | ASTM D 4791 | --- | 5 |
| Absorption, % | AASHTO T 85 | --- | 2.0 |
| Soundness (5 cycles), Sodium Sulfate | AASHTO T 104 | --- | 15 |
| Soundness (5 cycles), Magnesium Sulfate | AASHTO T 104 | --- | 20 |
| Crushed Content, one face | ASTM D 5821 | 100 | --- |
| Crushed Content, two face | ASTM D 5821 | 90 | --- |
Fine aggregate shall be 100 percent crushed and conform to the quality requirements given in table below.
| Test | Method | Minimum | Maximum |
|---|---|---|---|
| Liquid Limit, % | AASHTO T 89 | --- | 25 |
| Plasticity Index | AASHTO T 90 | Non Plastic | Non Plastic |
| Soundness (5 cycles), Sodium Sulfate | AASHTO T 104 | --- | 15 |
| Soundness (5 cycles), Magnesium Sulfate | AASHTO T 104 | --- | 20 |
Mineral filler shall consist of finely divided mineral matter such as crusher fines and fly ash. Filler shall be free from organic impurities and have a plasticity index not greater than four. Mineral fillers with modified Rigden voids higher than 50 percent not be used in SMA.
A stabilizer such as cellulose or mineral fiber will be added to the mixture to prevent draindown. For cellulose fibers, a dosage rate of approximately 0.3 percent or more by total mixture mass. For mineral fibers, a dosage rate of approximately 0.4 percent by total mixture mass is adopted. The maximum draindown shall be limited to 0.3 percent by weight of the mix when held at the plant temperature for 1 h.
The combined aggregates shall conform to the gradation requirements as given in the input table.
SMA Mixture Specifications for Superpave Gyratory Compactor are given in table below (for specimens compacted in accordance with AASHTO T 312 at 100 gyrations).
| Property | Requirement |
|---|---|
| Air Voids, % | 4.0 |
| VMA, % (3:1) | 17.0, min |
| VCAmix | less than VCADRC |
| Tensile Strength Ratio (TSR) | 0.80, min |
| Draindown at production temperature, % | 0.3%, max |
| Asphalt Binder Content, % | 6.0, min |
Input - Project & Sample Details
SMA Gradation Specification Bands: Input Table
| Sieve Size, mm |
Perc. Passing Sample |
19 mm nominal size UL |
19 mm nominal size LL |
12.5 mm nominal size UL |
12.5 mm nominal size LL |
9.5 mm nominal size UL |
9.5 mm nominal size LL |
|---|---|---|---|---|---|---|---|
| 25.0 | 100 | ||||||
| 19.0 | 100 | 90 | 100 | ||||
| 12.5 | 88 | 50 | 100 | 90 | 100 | ||
| 9.5 | 60 | 25 | 80 | 50 | 95 | 70 | |
| 4.75 | 28 | 20 | 35 | 20 | 50 | 30 | |
| 2.36 | 24 | 16 | 24 | 16 | 30 | 20 | |
| 1.18 | 21 | ||||||
| 0.600 | 18 | ||||||
| 0.300 | 15 | ||||||
| 0.075 | 11 | 8 | 11 | 8 | 12 | 8 |