top of page




A Competitive Advantage

Most asphalt test labs perform standard QA/QC testing. At CMTG (Construction Materials Testing Group) we go well beyond minimal requirements. This gives owners a competitive advantage by finding the perfect balance of cost-efficiency and quality assurance.

Our testing and engineering services include:

Materials research and development

QC/QA Hot mix asphalt testing

QC/QA Concrete testing

QC/QA Soils testing

Hot Mix Asphalt (HMA) performance testing

Aggregate testing

Binder grading

Reclaimed Asphalt Pavement (RAP) evaluation

Our History

CMTG was formed in 2014 as a joint venture between Superior Bowen and Clarkson Construction to perform Quality Control for the Kansas Department of Transportation (KDOT)’s massive Johnson County Gateway Project. In late 2014, CMTG completed its AASHTO accreditation process in Hot Mix Asphalt (HMA), aggregate, asphalt binder, and soils testing. In 2018, Superior Bowen purchased Clarkson’s interests, making CMTG a wholly-owned subsidiary of its family of companies.

Learn more.

bottom of page