DHDC Engineering Consulting Services, Inc.
Columbus,
Ohio
View Accreditation Certificate
Michael
Sminchak
2390 Advanced Business Center Drive
Columbus
,
Ohio
43228
Phone: (614) 527-7656
Fax:
sminchak@dhdcinc.com
http://www.dhdcinc.com
26-0906 : Accreditation has been suspended for Asphalt Mixture standard(s) D2172
26-3541 : Accreditation has been suspended for Soil standard(s) D4972
26-4655 : Accreditation has been suspended for Asphalt Mixture standard(s) D2041, D2726
26-5679 : Accreditation has been suspended for Aggregate standard(s) C128
Quality Management System - accredited since 12/15/2010
R18, C1077 (Concrete), D3666 (Asphalt Mixture), E329 (Asphalt Mixture), E329 (Concrete)
Asphalt Mixture - accredited since 12/15/2010
D3203, D3549, D6926
Soil - accredited since 12/15/2010
D421, D422, D698, D1140, D1557, D2166, D2216, D2487, D2488, D2974, D4318, D4643
Rock - accredited since 5/20/2013
D4644, D5731
Aggregate - accredited since 12/23/2010
C40, C117, C566, C702
Concrete - accredited since 12/23/2010
C31 (Beams), C31 (Cylinders), C39, C78, C138, C143, C172, C173, C231, C511, C1064, C1231 (7000 psi and below)
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 10/27/2026. Please visit https://aashtoresource.org for current accreditation status.
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