CMEC · FDOT · AASHTO R18
Accreditedtest methods.
Geo-Tech’s laboratory is accredited by the Construction Materials Engineering Council and the Florida Department of Transportation, and holds AASHTO R18 accreditation for soil, aggregate, concrete and hot mix asphalt. These are the test methods that accreditation covers, so you know exactly which standards stand behind your results.
01 · 9 methods
Aggregate
| Standard | Test method | What it measures |
|---|---|---|
| ASTM C1077 | Laboratory Evaluation Criteria | Sets the minimum personnel and equipment requirements for agencies that test concrete and concrete aggregates. |
| ASTM C117 / AASHTO T11 | Materials Finer than 75-µm (No. 200) Sieve | Measures the percentage of fine material, such as silt and clay, washed from an aggregate sample through a No. 200 sieve. |
| ASTM C127 / AASHTO T85 | Specific Gravity and Absorption of Coarse Aggregate | Determines the relative density and water absorption of coarse aggregate. |
| ASTM C128 / AASHTO T84 | Specific Gravity and Absorption of Fine Aggregate | Determines the relative density and water absorption of sand-sized fine aggregate. |
| ASTM C131 / AASHTO T96 | Los Angeles (L.A.) Abrasion | Evaluates how well coarse aggregate resists degradation and impact in a rotating drum with steel charges. |
| ASTM C136 / AASHTO T27 | Sieve Analysis and Gradation | Determines the particle size distribution of coarse and fine aggregate through a set of graded sieves. |
| ASTM C566 / AASHTO T255 | Total Evaporable Moisture Content by Drying | Measures the total moisture in an aggregate sample by oven or hot plate drying. |
| ASTM C702 / AASHTO R76 | Reducing Samples to Testing Size | Splits and quarters bulk aggregate down to a small sample that still represents the stockpile. |
| ASTM E329 | Construction Agency Inspection Standards | Establishes the quality control, engineering supervision and evaluation requirements for materials testing laboratories. |
02 · 9 methods
Concrete
| Standard | Test method | What it measures |
|---|---|---|
| ASTM C1064 / AASHTO T309 | Temperature of Fresh Concrete | Measures the temperature of freshly mixed concrete to confirm it falls within specified limits. |
| ASTM C1231 | Use of Unbonded Caps | Covers the elastomeric pads and metal retaining rings used when testing hardened concrete cylinders for strength. |
| ASTM C138 / AASHTO T121 | Density, Yield and Air Content (Gravimetric) | Calculates the unit weight, batch yield and gravimetric air content of fresh concrete. |
| ASTM C143 / AASHTO T119 | Slump | Assesses the consistency and workability of fresh concrete by measuring how far it slumps. |
| ASTM C172 / AASHTO R60 | Sampling Freshly Mixed Concrete | Standardizes how representative samples of fresh concrete are taken from mixers and trucks. |
| ASTM C231 / AASHTO T152 | Air Content by Pressure Method | Determines the entrained and entrapped air in fresh concrete with a pressure meter. |
| ASTM C31 / AASHTO R100 | Making and Curing Specimens in the Field | Standardizes how strength test cylinders are cast, rodded, finished and stored on site. |
| ASTM C39 / AASHTO T22 | Compressive Strength of Cylinders | Measures the maximum axial load a hardened concrete cylinder carries before it fails. |
| ASTM C511 / AASHTO M201 | Moist Cabinets, Rooms and Storage Tanks | Sets the humidity and water temperature needed to cure concrete test specimens properly. |
03 · 4 methods
Hot Mix Asphalt
| Standard | Test method | What it measures |
|---|---|---|
| ASTM D2726 / AASHTO T166 | Bulk Specific Gravity of Compacted Asphalt | Determines the bulk specific gravity and density of compacted asphalt cores and laboratory specimens. |
| ASTM D3666 | Asphalt Testing Agency Criteria | Defines the minimum standards for inspector qualifications and equipment in an asphalt testing laboratory. |
| ASTM D5444 / AASHTO T30 | Gradation of Extracted Aggregate | Evaluates the particle size distribution of aggregate recovered from an asphalt mix. |
| ASTM D6307 / AASHTO T308 | Asphalt Content by Ignition | Burns the binder out of a hot mix sample in a furnace and measures the binder content by weight loss. |
04 · 11 methods
Soil
| Standard | Test method | What it measures |
|---|---|---|
| ASTM D1140 / AASHTO T88 | Amount of Soil Finer than the No. 200 Sieve | Determines the fraction of a dry soil sample made up of fine silt and clay particles by washing. |
| ASTM D1557 / AASHTO T180 | Modified Proctor Compaction | Establishes the maximum dry density and optimum moisture using a 10-lb rammer dropped 18 inches. |
| ASTM D2216 / AASHTO T265 | Water Content by Mass | Calculates the moisture in a soil sample by comparing its wet weight with its oven-dried weight. |
| ASTM D421 / AASHTO R58 | Dry Preparation of Soil Samples | Covers how raw soil samples are dried, broken down and split for testing. |
| ASTM D4318 / AASHTO T89 & T90 | Atterberg Limits (LL, PL, PI) | Finds the liquid limit, plastic limit and plasticity index, the moisture points where soil behavior changes. |
| ASTM D6938 / AASHTO T310 | In-Place Nuclear Density | Uses a nuclear gauge for immediate, non-destructive readings of in-place soil density and moisture. |
| ASTM D698 / AASHTO T99 | Standard Proctor Compaction | Establishes the moisture and density curve using a 5.5-lb rammer dropped 12 inches. |
| AASHTO T267 | Organic Content by Loss on Ignition | Measures the organic content of soil by burning off organic material in a muffle furnace. |
| FM 1 T099 & T180 | Florida Standard and Modified Proctor | The Florida method for standard and modified compaction, suited to the state’s sandy soils. |
| FM 5 514 | Carbonates and Organics in Limerock | Identifies the carbonate content and organic impurities in limerock base material. |
| FM 5 515 | Limerock Bearing Ratio (LBR) | The Florida bearing test for subgrade, base and embankment layers. |
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