Twining, Inc.
Riverside,
California
View Accreditation Certificate
Sammy
Daghighi
111 North Main Street
Suite A
Riverside
,
California
92501
Phone: (909) 915-2052
Fax: (562) 426-6424
sdaghighi@twininginc.com
http://www.twininginc.com
Quality Management System - accredited since 5/1/2006
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)
Asphalt Mixture - accredited since 4/7/2008
R30, R35, R47, T30, T166, T209, T246, T247, T269, T275, T283, T308, T312, T324, T329, T355, D1560 (Stability), D1561, D2041, D2726, D2950, D3203, D3549, D4867, D5444, D6307, D6925, D6931
Soil - accredited since 4/7/2008
R58, T89, T90, T99, T100, T134, T180, T190, T191, T265, T267, T310, D421, D558, D698, D1140, D1556, D1557, D1633, D2216, D2487, D2488, D2844, D2937, D2974, D4253, D4254, D4318, D4643, D4718, D4829, D6913, D6938
Aggregate - accredited since 5/1/2006
R76, R90, T11, T19, T21, T27, T37, T84, T85, T100 (Mineral Filler), T112, T176, T210, T255, T304, T335, C29, C40, C117, C127, C128, C136, C142, C566, C702, C1252, D75, D2419, D3744, D4791, D5821
Sprayed Fire-Resistive Material - accredited since 1/4/2023
E605, E736
Concrete - accredited since 5/1/2006
C31 (Beams), C31 (Cylinders), C39, C42 (Testing Drilled Cores of Concrete), C78, C138, C143, C172, C174, C231, C511, C617 (10000 psi and below), C1064, C1231 (7000 psi and below), C1542
Masonry - accredited since 8/9/2018
C140 (Reduced-Size Concrete Masonry Units) (Sampling and Testing Concrete Masonry Units and Related Units)
C511 (Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the testing of Hydraulic Cements and Concretes)
C780 (Annex 1) (Preconstruction and Construction Evaluation of Mortars for Plain and Reinforced Unit Masonry - Consistency by Cone Penetration)
C780 (Annex 6 - Cubes) (Preconstruction and Construction Evaluation of Mortars for Plain and Reinforced Unit Masonry - Compressive Strength of Cubes)
C1019 (Sampling and Testing Grout)
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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