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Materials Testing

In late 2007, Cobb’s Construction Management Division added a materials testing laboratory to support its inspection services. Services provided include laboratory testing of soils, aggregates, and concrete test specimen. Additionally, field services include sampling and testing of fresh concrete, making and curing concrete cylinders, and in-place nuclear density testing.

In 2009, the lab expanded services to included soils analyses for foundation designs and field testing for commercial clients.

CEC technicians are equipped with all of the sampling, concrete testing and miscellaneous equipment necessary to perform their jobs. They are all ODOT-certified for sampling and testing. Our testing lab in our Oklahoma City Office allows us to maintain accurate and timely materials test results, which are critical in project management.

Testing Methods AASHTO ASTM
Sampling of Aggregates T2 D75
200 by Washing T11 C117
Sieve Analysis of Course & Fine Aggregates T27 C136
Particle Size Analysis of Soil T88 D422
Liquid Limit (Atterburg Limits) T89 D4318
Plastic Limit (Atterburg Limits) T90 D4318
Std. Proctor T99 D698
Mod. Proctor T180 D1557
In Place Density (Nuclear Method) T310 D2922
Classification of Soil M145 D3282
Sampling of Fresh Concrete T119 C143
T309 C1064
T152 C231
T141 C172
T121 C138
Comprehensive Strength of Concrete Specimen T22 C39
Making and Curing Concrete Test Specimen T23 C31
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    Cobb Engineering Company
    4516 NW 36th Street
    Oklahoma City, OK 73122-2426
    405.415.9400

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