Stephen D. Sebesta

Sebesta, Stephen

Associate Research Scientist

Flexible Pavements - CE/TTI, Room 304B
Texas A&M Transportation Institute
Texas A&M University System
3135 TAMU
College Station, TX 77843-3135
ph. (979) 458-0194 Ext. 80194 · fax (979) 845-1701
s-sebesta@ttimail.tamu.edu

Short Biography

Mr. Stephen Sebesta is an associate research scientist at the Texas A&M Transportation Institute (TTI). His research interests include identification and development of new techniques for field and laboratory quality control, soil and base stabilization and reclamation, nondestructive testing, and forensic evaluation. He enjoys working closely with stakeholders to identify solutions to real-world problems and places high priority on providing results of practical usefulness to project sponsors.

Mr. Sebesta currently serves as TTI's materials laboratory manager and has a bachelor of science degree in agricultural systems management and a master's degree in agribusiness, both from Texas A&M University. Mr. Sebesta has successfully completed the NCEES Fundamentals of Engineering examination and has authorship roles in more than 65 published research reports and products from Texas Department of Transportation (TxDOT) projects. His involvement in operations at the materials laboratory has provided him an excellent perspective on both the technical and administrative requirements of accomplishing project work. His active role in TxDOT, federal, and industry-sponsored projects over the past 15 years has provided him leadership opportunities to package extensive amounts of information into tangible and implementable results for sponsors. In the area of field and laboratory quality control, he coordinated between TxDOT, contractors, and an original equipment manufacturer to support TxDOT's statewide adoption of thermal profiling with PAVE-IR. That joint effort between research and industry resulted in updated TxDOT specifications and test procedures. He has also performed work using ground-penetrating radar (GPR) for construction quality control and recently completed national-level work to pilot both the thermal profiling and radar QC applications with multiple state DOTs, as well as provide draft American Association of State Highway and Transportation Officials test methods for those QC technologies. In other quality-control related projects, he evaluated and provided recommendations on intelligent compaction and led efforts to develop and implement a new laboratory compaction control for Tex-113-E. Those implementation efforts required coordination of research findings, TxDOT interests, and feedback from a TxDOT-AGC joint task force and resulted in an updated TxDOT test procedure.

In his other research interest areas, Mr. Sebesta has combined field and laboratory pavement and materials analysis to compare the structural equivalency and cost implications of competing materials, evaluate existing pavement sections and develop full-depth reclamation designs to address structural requirements and other site-specific factors, as well as help identify the cause of pavement distress to formulate rehabilitation strategies. In these areas, Mr. Sebesta applies his expertise in using GPR, the falling weight deflectometer, the dynamic cone penetrometer, pavement sampling and coring, laboratory mixture design and characterization, and pavement design and analysis (including Texas' FPS). Mr. Sebesta also recently helped oversee an extensive program to fully characterize numerous flexible base courses from Texas sources. This program involved both standard TxDOT tests and advanced tests, such as repeated load triaxial testing for use in mechanistic-empirical analysis. As part of these efforts, Mr. Sebesta actively participated in the transfer of results and recommendations to an industry working group comprised of both TxDOT and contractor members.

Mr. Sebesta packages research results into products aimed at promoting knowledge transfer and implementation. He has

- developed a guideline for maintenance repairs of pavement failures,

- produced an outreach pamphlet for microcracking,

- scripted and produced videos for thermal profiling asphalt mixture construction and best practices for construction of flexible base courses,

- developed and conducted a webinar to support TxDOT's implementation of Pave-IR, and

- helped conduct workshops for full-depth recycling.

He also maintains professional participation at the national level, where he generally presents or publishes at least once a year. To date, Mr. Sebesta's national participation activities have included ASCE, TRB, USACE, AAPT, SHRP2, ASNT, TCM, and NACE functions.

Education

  • M.Agr., Agribusiness, Texas A & M University, 2000.
  • B.S., Agricultural Systems Management, Texas A & M University, 1998.

Experience

  • Associate Research Scientist, Flexible Pavements, Texas A&M Transportation Institute, November 2010 - Present.
  • Assistant Research Scientist, Flexible Pavements, Texas Transportation Institute, May 2007 - November 2010.
  • Associate Transportation Researcher, Flexible Pavements, Texas Transportation Institute, December 2002 - April 2007.
  • Assistant Transportation Researcher, Materials and Pavements Division, Texas Transportation Institute, January 2001 - November 2002.

Selected Publications

S.D. Sebesta. Rapid Field Detection of Moisture Content for Base and Subgrade. 0-6676-S. Texas Transportation Institute, College Station, TX. May 2014.

S.D. Sebesta, T. Scullion. Developing Guidelines for Repairing Severe Edge Failures: Technical Report. 0-6271-2-1. Texas A&M Transportation Institute, College Station, TX. April 2014.

J.A. Epps, S.D. Sebesta, B.A. Hewes, H. Sahin, R. Luo, J.W. Button, R.L. Lytton, C. Herrera, D.R. Hatcher, F. Gu. Development of a Specification for Flexible Base Construction. 0-6621-2. Texas A&M Transportation Institute, College Station, TX. January 2014.

S.D. Sebesta, T. Scullion, T. Saarenketo. Using Infrared and High-Speed Ground-Penetrating Radar for Uniformity Measurements on New HMA Layers. SHRP 2 Report. S2-RO6C-RR-1. Transportation Research Board, Washington, DC. 2013.

S.D. Sebesta, J.H. Oh, S. Lee, M. Sanchez Castilla, R.J. Taylor. Initial Review of Rapid Moisture Measurement for Roadway Base and Subgrade. 0-6676-1. Texas A&M Transportation Institute, College Station, TX. May 2013.

J.A. Epps, B.A. Hewes, S.D. Sebesta. Mixture Design Procedure for Flexible Base. 0-6621-P1. Texas A&M Transportation Institute, College Station, TX. April 2013.

J.A. Epps, S.D. Sebesta. Powerpoint Presentation and Handout Material for Summary of Spec Test Procedures Actions to Take for Non-Compliance. 0-6621-P2. Texas A&M Transportation Institute, College Station, TX. March 2013.

J.A. Epps, S.D. Sebesta, B.A. Hewes. Developing a Mixture-Based Specification for Flexible Base: PowerPoint Presentation. 0-6621-P3. Texas A&M Transportation Institute, College Station, TX. March 2013.

T. Scullion, S.D. Sebesta. Performance Histories of Thermally Segregated HMA. 0-6080-S. Texas Transportation Institute, College Station, TX. 2012.

T. Scullion, S.D. Sebesta, R.J. Taylor, J.T. Frazier, C. Shon. Flexible Base Acceptance Testing. PSR. 0-6587-S. Texas Department of Transportation - Austin District, Austin, TX. 2012.

S.D. Sebesta, C. Shon, T. Scullion. Alternative Methods of Flexible Base Compaction Acceptance. 0-6587-2. Texas A&M Transportation Institute, College Station, TX. November 2012.

T. Scullion, S.D. Sebesta. Best Construction Practices Video. 0-6587-P2. Texas Transportation Institute, College Station, TX. September 2012.

S.D. Sebesta, T. Scullion, C.K. Estakhri, P.R. Harris, C.S. Shong, O.R. Harvey, K.R. Harvey. Full-Depth Reclamation: New Test Procedures and Recommended Updates to Specifications. 0-6271-2. Texas Transportation Institute, College Station, TX. July 2012.

C. Shon, S.D. Sebesta, T. Scullion. Implementation of Technology for Rapid Field Detection of Sulfate and Organic Content in Soils: Technical Report. 5-6362-01-1. Texas Transportation Institute, College Station, TX. June 2012.

J. Epps, S.D. Sebesta, H. Sahin, J.W. Button, R. Luo, R.L. Lytton. Developing a Mixture Design Specification for Flexible Base Construction. 0-6621-1. Texas Transportation Institute, College Station, TX. June 2012.

S.D. Sebesta, T. Scullion, R.J. Taylor, J.T. Frazier. Alternative Methods of Flexible Base Compaction Acceptance. 0-6587-1. Texas Transportation Institute, College Station, TX. May 2012.

S.D. Sebesta, T. Scullion. Performance Monitoring Pavements with Thermal Segregation in Texas. 0-6080-1. Texas Transportation Institute, College Station, TX. April 2012.

S.D. Sebesta, R.J. Taylor. Implementation of the Soil Compactor Analyzer Into Test Method TEX-113-E: Technical Report. 5-5135-01-1. Texas Transportation Institute, College Station, TX. April 2012.

S.D. Sebesta, T. Scullion. Statewide Implementation of PAVE-IR in the Texas Department of Transportation. 5-4577-05-1. Texas Transportation Institute, College Station, TX. February 2012.

T. Scullion, S.D. Sebesta. Full Depth Reclamation: Workshop Materials. 0-6271-P2. Texas Transportation Institute, College Station, TX. February 2012.

T. Scullion, S.D. Sebesta, C.K. Estakhri, P.R. Harris. FDR (Full-Depth-Reclamation) Performance-Based Design, Construction and Quality Control. 0-6271-S. Texas Transportation Institute, College Station, TX. 2011.

P.R. Harris, O.R. Harvey, S.D. Sebesta. Rapid Field Detection of Sulfate and Organic Content in Soils: Technical Report. 0-6362-1. Texas Transportation Institute, College Station, TX. June 2011.

J.P. Harris, O.R. Harvey, S.D. Sebesta. Implementation of the UV-VIS Method to Measure Organic Content in Clay Soils: Technical Report. 5-5540-01-1. Texas Transportation Institute, College Station, TX. May 2011.

S.D. Sebesta, T. Scullion, C.K. Estakhri. Field and Laboratory Investigations for Full Depth Reclamation Projects. 0-6271-1. Texas Transportation Institute, College Station, TX. March 2011.

S.D. Sebesta, D. Rand, R.P. Izzo. Pave-IR Webinar Modules 1, 2, and 3. 5-4577-05-P1. Texas Transportation Institute, College Station, TX. March 2011.

O.R. Harvey, Pat, S.D. Sebesta. Test Procedure for Determining Organic Matter Content in Soils -- UV-VIS Method. 5-5540-01-P4. Texas Transportation Institute, College Station, TX. November 2010.

T. Scullion, X. Hu, S.D. Sebesta. Design, Construction, and Performance Monitoring of the Very Thin Overlay Placed on Bus 59 in the Lufkin District. 5-5598-01-2. Texas Transportation Institute, College Station, TX. January 2010.

S.D. Sebesta, T. Scullion. Rubblization and Base Overlay of FM 912 and FM 1155. 5-4687-01-1. Texas Transportation Institute, College Station, TX. January 2010.