Level 2 Level 2 Mix Design Specialist certification is a three-day certification course that certifies an individual’s ability to properly design and mix Hot Mix Asphalt. This course takes an individual through the processes needed to sample and test the individual components of materials that go into an asphalt pavement design, blend the design in a laboratory then test the completed design in accordance with TxDOT test procedures to assure the design meets the required specifications. Test Procedures covered: Click on link to view test procedure: Tex-204-F, Design of Bituminous Mixtures (August 2016) Tex-205-F, Laboratory Method of Mixing Bituminous Mixtures (August 2016) Tex-236-F, Determining Asphalt Content from Asphalt Paving Mixtures by the Ignition Method (Part 2) (July 2019) Pre-requisite A current Level 1A and AGG101 are required to participate in this class. Re-certification Level 2 Mix design Specialists are required to re-certify every three years. Specialist can re-certify up to one year prior to expiration date. Since Level 1A and AGG101 are pre-requisite to Level 2, if a specialist loses either their Level 1A or AGG101 certification for any reason the Level 2 Certification is automatically inactive.