Twining, Inc.
San Diego,
California
View Accreditation Certificate
Ryan
Powney
15950 Bernardo Center Drive
Suite J
San Diego
,
California
92127
Phone: (858) 974-3750
Fax:
rpowney@twininginc.com
http://www.twininginc.com
Quality Management System - accredited since 6/16/2010
R18, C1077 (Aggregate), C1077 (Concrete), C1093 (Masonry), D3666 (Aggregate), D3666 (Asphalt Mixture), D3740 (Soil), E329 (Aggregate), E329 (Asphalt Mixture), E329 (Concrete), E329 (Masonry), E329 (Soil), E329 (Sprayed Fire-Resistive Material)
Pavement Preservation - accredited since 2/20/2026
TB-100 / D3910/D6372 (Wet Track Abrasion Of Slurry Surfacing Systems)
Asphalt Mixture - accredited since 11/14/2012
R47, T30, T166, T209, T246, T247, T269, T275, T308, D1188, D1560 (Stability), D1561, D2041, D2726, D3203, D5444, D6307
Soil - accredited since 6/16/2010
R58, T88, T89, T90, T99, T180, T190, T191, T216, T236, T265, T310, D421, D422, D698, D1140, D1556, D1557, D2216, D2435, D2487, D2488, D2844, D3080 (5000 lb/ft-sq or Greater Normal Stress), D4318, D4829, D6938, D7928
Aggregate - accredited since 6/16/2010
R76, R90, T11, T19, T21, T27, T84, T85, T104, T112, T176, T210, T255, T304, T335, C29, C40, C88, C117, C127, C128, C136, C142, C566, C702, C1252, D75, D2419, D3744, D4791, D5821
Sprayed Fire-Resistive Material - accredited since 6/16/2010
E605, E736
Concrete - accredited since 9/11/2012
M201, R39, R60, R100 (Beams), R100 (Cylinders), R115, T22, T24 (Drilling Cores of Concrete), T24 (Testing Drilled Cores of Concrete), T97, T119, T121, T148, T152, T160, T196, T197, T231 (10000 psi and below), T303, T309, C31 (Beams), C31 (Cylinders), C39, C42 (Drilling Cores of Concrete), C42 (Testing Drilled Cores of Concrete), C78, C138, C143, C157, C172, C173, C174, C192, C231, C305, C403, C511, C617 (10000 psi and below), C642, C1064, C1140 (Obtaining and Testing Specimens), C1231 (7000 psi and below), C1260, C1567
Masonry - accredited since 6/30/2016
T106 / C109 (Compressive Strength of Hydraulic Cement Mortars (Using 2-in. Cube Specimens))
T137 / C185 (Air Content of Hydraulic Cement Mortar)
R115 / C305 (Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency)
M201 / C511 (Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the testing of Hydraulic Cements and Concretes)
C140 (Concrete Masonry Units) (Sampling and Testing Concrete Masonry Units and Related Units)
C1019 (Sampling and Testing Grout)
C1437 (Flow of Hydraulic Cement Mortar)
C1552 (Capping Concrete Masonry Units, Related Units and Masonry Prisms for Compression Testing)
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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