The Central Materials Laboratory (CML) will accredit the District Materials Laboratories and maintain records of the accreditation for five years. The CML Staff will check the following prior to accrediting a laboratory:
1. Check for current manuals and test procedures covering the accredited testing.
2. Check the certification and training records of the testing personnel.
3. Document that proper equipment is available to perform qualified testing.
4. Check documentation system.
Scheduling of the annual accreditation review will be discussed with the laboratories needing accreditation.
Table 1 is the list of items to be reviewed.
An oral close out on any deficiencies will be held with the testing personnel. Written notice will be sent within two months of the inspection. CML personnel will re-inspect if necessary after correction of any deficiencies.
A report showing the laboratory, the date accredited, and the expiration date will be issued.
A laboratory that does not meet the requirements of the IM is subject to elimination from the qualification program.
The CML and the District Materials Engineer will resolve disputes concerning calibration and correlation of equipment.
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TABLE 1 - Laboratory Accreditation Checklist |
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Minimum Calib./Verif. Interval |
Calib./Verif. Procedure |
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Tester Qualifications-Proper Iowa DOT certifications |
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Current Test Procedures |
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Current Calibration Procedures & Records |
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Documentation of correlation results and corrective actions taken for previous construction season |
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Balances |
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12 months |
Iowa 917-B |
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Ovens |
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12 months |
Iowa 1501-A |
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Mechanical Shakers |
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12 months |
Iowa 1502-A |
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Gyratory Compactor T-312 |
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6 months |
Iowa 1522-A |
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Comp. Test Machine T-245 |
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12 months |
Iowa 1505-A |
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Sieves |
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6 months |
Iowa 1506-A |
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Thermometers - Test |
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6 months |
Iowa 1607-A |
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Thermometers - Ref. |
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12 months |
Iowa 1607-A |
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Timers T-201, T-202 |
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6 months |
Iowa 1508-A |
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Sand Equivalent T-176 |
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12 months |
Iowa 1509-A |
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Gyratory Compactor Molds T-312 |
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12 months |
Iowa 1524-A |
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Vacuum Systems T-209 |
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12 months |
Iowa 1510-A |
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Pycnometers T-228, T209 |
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12 months |
Iowa 1618-A |
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Fine Aggregate Anularity T-304 |
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12 months |
Iowa 1525-A |
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Dynamic Shear Rheometer T-315 |
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6 months |
Iowa 1612-A |
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Balance Weights M-231 |
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12 months |
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Sample Splitters T-248 |
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12 months |
(visual condition) |