Trimat has provided laboratory and field services to NC State University and the North Carolina Department of Transportation (NCDOT) for NCDOT and NCHRP (National Cooperative Highway Research Program) research projects since 2004. Trimat has also been involved in conducting research to improve the existing test methods to determine cracking potential, moisture sensitivity, and long term performance of asphalt concrete mixtures.

Projects we are currently working on:

  • Use of Moisture-Induced Stress Test (MIST) to Determine Moisture Sensitivity of Asphalt Mixtures. NCDOT RP 2017-01. [In collaboration with NCSU].

  • Applicability of IDEAL-CT and SCB test for testing the cracking potential of North Carolina Mixtures.

  • Effect of RAP and RAS on the cracking potential of North Carolina Mixtures.

  • Estimating optimum antistrip additive dosages for asphalt mixtures.

Our past projects include:

  • Effectiveness of TSR Test for Evaluating Moisture Sensitivity of WMA Mixes. NCDOT RP 2014-04. [In collaboration with NCSU].

  • Extended Testing Conditions for the Evaluation of Water Sensitivity of HMA Mixes.

We have provided laboratory services for the following projects:

  • Characterization of Different RAP Sources. NCDOT RP 2014-05. [Binder extraction for NCSU].

  • Impact of Binders from Waste Materials on Performance of Surface Mixtures. NCDOT RP 2013-06. [Laboratory services for NCSU].

  • Impact of WMA Technology on the Use of RAP Mixtures in NC. NCDOT RP 2013-05. [Laboratory services for NCSU].

  • Determining Recycled Asphalt Binder Limits Contributed by Waste Materials. NCDOT RP 2012-04. [Laboratory services for NCSU].

  • Investigation of primary causes of fatigue cracking in North Carolina. NCDOT RP 2010-01. [Field services for NCSU].

We are continuously involved on future research projects with the NC State, NCDOT and NCHRP.

Publications and Presentations

  • Yadav, S., Kusam A., LaCroix, A., Tayebali, AA., “Use of Boil Test and Moisture Induced Stress Tester (Mist) Device to Propose Limits for Adhesive and Cohesive Damage in Asphalt Mixtures,” TRB 2019 Lectern Presentation.

  • Kusam A., Yadav, S., Tayebali, AA., “Alternate Methods for Evaluation of Moisture Sensitivity of Asphalt Mixtures,” TRB 2019 Poster Presentation.

  • Tayebali, AA., Kusam A., Bacchi, C., “An Innovative Method for Interpretation of Asphalt Boil Test,” Journal of Testing and Evaluation, 2018.

  • LaCroix, A., Regimand, A., James, L., “Proposed Approach for Evaluation of Cohesive and Adhesive Properties of Asphalt Mixtures for Determination of Moisture Sensitivity,” Transportation Research Record: Journal of Transportation Research Board, 2016. 2575:61 -69.

  • Rowe, G., Ranka, A., Ranka, M., Zuberer, D., Thayer, J., LaCroix, A., Bacchi, C., “Extended Testing Conditions for the Evaluation of Water Sensitivity of HMA Mixes,” ISAP TC on Constitutive Modelling presentation, 2016, Washington, D.C.

Trimat provides education for the asphalt industry in North Carolina through online classes and traditional classroom settings. Currently, Trimat professionals teach the following classes:

NCDOT QMS Roadway Class

This online class is offered in cooperation with Stanly Community College in Albemarle, NC. Students who are seeking re-certification in QMS Asphalt Roadway can conveniently attend this online class at their own pace. 

Register through SCC

SuperPave Mix Design Workshop

The SuperPave mix design workshop is taught at our Raleigh facility and incorporates classroom and laboratory sessions. Its target students include experienced asphalt technicians and design engineers. The class will go through all aspects of the Superpave mix design process including aggregate selection, consensus and source properties, trial blends, PG binders, four increment design, and TSR’s. This class is a prerequisite to the NCDOT Level II QMS and Mix Design Certifications. Trimat conducts classes based on the number of students enrolled. If you are interested in attending please complete the form below.

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Binder research into new additives to enhance workability

Binder research into new additives to enhance workability

Upcoming Classes

The Superpave Mix Design Workshop will be held in either January or February of 2020. Check back at the end of 2019 for more info. The class will be held at our office at 1 Triangle Drive, Suite 200 RTP, NC 27709

The 2017 Superpave Mix Design workshop was held January 30th through February 2nd, 2017 in Raleigh. 

January 2017 lab portion of the class

January 2017 lab portion of the class

The 2016 Superpave Mix Design Workshop was held January 25th through January 28th, 2016.   

2015 Superpave Mix Design Workshop

The 2015 workshop was held the week of March 2nd through the 5th at our lab in Raleigh. This class is usually offered once a year in the winter. 


March 2015 Class

March 2015 Class