Level 2


The 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. The laboratory Instructors will evaluate participants during procedure performance. Upon successful completion of the certification program a written exam is administered on the final day of the course. A score of 80% or higher is considered passing.

Test Procedures covered:

Tex-107-F Determining the Bar Linear Shrinkage of Soils
Tex-203-F Sand Equivalent
Tex- 204-F Design of Bituminous Mixtures
Tex-205-F Laboratory Method of Mixing Bituminous Mixtures
Tex-206-F Compacting Specimens Using the Texas Gyratory Press (TGC)
Tex-207-F Determining Density of Compacted Bituminous Mixtures (Parts I, VI and VIII)
Tex-217-F Determining Deleterious Materials and Decantation Test for Coarse Aggregate
Tex-226-F Indirect Tensile Strength Test
Tex-227-F Theoretical Maximum Specific Gravity of Bituminous Mixtures (Parts I and II)
Tex-235-F Determining Draindown Characteristics in Bituminous Materials
Tex-236-F Determining Asphalt Content from Asphalt Paving Mixtures by the Ignition Method
Tex-241-FSuperpave Gyratory Compacting of Test Specimens of Bituminous Mixtures
Tex-242-F Hamburg Wheel-Tracking Test
Tex-245-F Cantabro Loss
Tex-280-F Determining Flat and Elongated Particles
Tex-408-A Organic Impurities in Fine Aggregate for Concrete
Tex-460-A Determining Crushed Face Particle Count
Tex-461-A Degradation of Coarse Aggregate by Micro-Deval Abrasion


A current Level 1A is required to participate in this class.


Every three (3) years all Level 2 Mix design Specialists are required to re-certify. A specialist can re-certify up to one year prior to expiration date. The re-certification course is a three day class. Since Level 1A is a pre-requisite to Level 2, if a specialist loses Level 1A Certification for any reason the Level 2 Certification is automatically suspended. The technician will then be required to attend both the one day Level 1A Plant Production class AND the Level 2 program before performing Level 2 testing and responsibilities on TxDOT projects.