FHWA-Central Federal Lands Highway Division
Denver,
Colorado
View Accreditation Certificate
Patrick
Kowing
1 Denver Federal Center
Building 52
Central Fed. Lands Highway Div. Lab
Denver
,
Colorado
80225
Phone: (720) 963-3538
Fax:
patrick.kowing@dot.gov
Quality Management System - accredited since 3/1/1989
R18, ISO/IEC 17025, C1077 (Aggregate), C1077 (Concrete), D3666 (Aggregate), D3666 (Asphalt Binder), D3666 (Asphalt Mixture), D3740 (Soil), E329 (Aggregate), E329 (Asphalt Binder), E329 (Asphalt Mixture), E329 (Concrete), E329 (Soil)
Asphalt Binder - accredited since 3/1/1989
R28, T51, T228, T240, T301, T313, T315, T316, T350, D70, D113, D2872, D4402, D6084, D6648, D7175, D7405
Emulsified Asphalt - accredited since 3/1/1989
T59 / D6930 (Settlement and Storage Stability)
T59 / D6933 (Sieve Test)
T59 / D6934 (Residue by Evaporation)
T59 / D6998 (Aggregate Coating)
T59 / D7402 (Particle Charge)
T59-T72 / D7496-D88 (Saybolt Furol Viscosity at 25°C (77°F))
T59-T72 / D7496-D88 (Saybolt Furol Viscosity at 50°C (122°F))
Asphalt Mixture - accredited since 3/1/1989
R30, R35, R47, R79, R97, T30, T166, T167, T209, T246, T247, T269, T283, T305, T308, T312, T329, T331, D979, D1074, D1075, D1560 (Stability), D1561, D2041, D2726, D3203, D3549, D3665, D4867, D5444, D6307, D6390, D6752, D6925, D6931, D7227
Soil - accredited since 3/1/1989
R58, R74, T89, T90, T99, T100, T180, T190, T265, T267, T288, T289, T311, D421, D698, D854, D1140, D1557, D2216, D2487, D2488, D2844, D2974, D4318, D4643
Rock - accredited since 3/5/2025
D4543, D7012 (Method C)
Aggregate - accredited since 3/1/1989
R76, R90, T11, T19, T21, T27, T37, T84, T85, T96, T100 (Mineral Filler), T104, T112, T176, T255, T304, T335, C29, C40, C88, C117, C127, C128, C131, C136, C142, C535, C566, C702, C1252, D75, D546, D2419, D4791, D5821
Concrete - accredited since 3/1/1989
M201, R39, R60, R100 (Cylinders), R115, T22, T24, T119, T121, T148, T152, T196, T231 (8000 psi and below), T303, T309, C31 (Cylinders), C39, C42, C138, C143, C172, C173, C174, C192, C231, C305, C511, C617 (8000 psi and below), C642, C1064, C1140 (Obtaining and Testing Specimens), C1231 (7000 psi and below), C1260, C1542, C1567, C1604
Please note that our accreditations do not include an expiration date. An accreditation only expires when the laboratory fails to comply with our accreditation requirements.
* This information is only valid as of 1/27/2026. Please visit https://aashtoresource.org for current accreditation status.
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