Accreditation self-declared (A2LA)
Construction-materials quality assurance organisation in Frederick, Maryland that runs a proficiency sample programme for laboratories testing soil, aggregate, asphalt binder, emulsified asphalt, asphalt mixtures, slurry surfacings, paint and other construction materials, with paired samples and z-score reports.
aashtoresource.org
Soil Classification and Compaction
SOL
Soil Corrosivity and Chemistry
SCC
Soil California Bearing Ratio
CBR
Aggregate Gradation and Gravity
AGG
Aggregate Degradation
AGD
Viscosity Graded Asphalt Cement
BAC
Performance Graded Asphalt Binder
PGB
Unmodified Emulsified Asphalt
EML
Slurry and Micro Systems
SMS
Asphalt Mixture Ignition Oven
HMI
Asphalt Mixture Gyratory
HMG
Asphalt Mixture Hamburg Wheel-Track
HWT
Paint
PNT
| Scheme | Testing fields | Sample type | Analytes | Rounds/yr | Link |
|---|---|---|---|---|---|
| Soil Classification and CompactionSOL |
| Soil | Particle size, liquid and plastic limit, moisture-density relations, specific gravity, organic content | 1 | Scheme page for Soil Classification and Compaction (opens in a new tab) |
| Soil Corrosivity and ChemistrySCC |
| Soil | Minimum resistivity, pH, water-soluble sulfate and chloride | 1 | Scheme page for Soil Corrosivity and Chemistry (opens in a new tab) |
| Soil California Bearing RatioCBR |
| Soil | — | 1 | Scheme page for Soil California Bearing Ratio (opens in a new tab) |
| Aggregate Gradation and GravityAGG |
| Fine and coarse aggregate | Sieve analysis, material finer than 75 µm, specific gravity and absorption, sand equivalent, uncompacted voids | 1 | Scheme page for Aggregate Gradation and Gravity (opens in a new tab) |
| Aggregate DegradationAGD |
| Aggregate | Los Angeles abrasion, soundness, Micro-Deval | 1 | Scheme page for Aggregate Degradation (opens in a new tab) |
| Viscosity Graded Asphalt CementBAC |
| Asphalt cement | Flash point, penetration, viscosity, specific gravity, RTFO residue tests | 2 | Scheme page for Viscosity Graded Asphalt Cement (opens in a new tab) |
| Performance Graded Asphalt BinderPGB |
| Asphalt binder | DSR, rotational viscosity, MSCR, BBR, elastic recovery | 2 | Scheme page for Performance Graded Asphalt Binder (opens in a new tab) |
| Unmodified Emulsified AsphaltEML |
| Emulsified asphalt | — | 1 | Scheme page for Unmodified Emulsified Asphalt (opens in a new tab) |
| Slurry and Micro SystemsSMS |
| Slurry surfacing | — | 1 | Scheme page for Slurry and Micro Systems (opens in a new tab) |
| Asphalt Mixture Ignition OvenHMI |
| Hot mix asphalt | — | 1 | Scheme page for Asphalt Mixture Ignition Oven (opens in a new tab) |
| Asphalt Mixture GyratoryHMG |
| Hot mix asphalt | — | 1 | Scheme page for Asphalt Mixture Gyratory (opens in a new tab) |
| Asphalt Mixture Hamburg Wheel-TrackHWT |
| Compacted asphalt mixture | — | 1 | Scheme page for Asphalt Mixture Hamburg Wheel-Track (opens in a new tab) |
| PaintPNT |
| Paint | — | 1 | Scheme page for Paint (opens in a new tab) |
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Compiled from AASHTO re:source Proficiency Sample Program (PSP)'s own published information or sent in by the provider, and reviewed by EqasOnline. Check scheme details, fees and dates with the provider before you enrol. 13 schemes listed here.
Last updated 1 Nov 2026.
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