Thomas Scullion, P.E.

Scullion, Tom

Senior Research Engineer
Program Manager

Flexible Pavements - CE/TTI, Room 304C
Texas A&M Transportation Institute
Texas A&M University System
3135 TAMU
College Station, TX 77843-3135
ph. (979) 845-9913 Ext. 59913 · fax (979) 845-1701
t-scullion@tamu.edu

Short Biography

Mr. Tom Scullion is a Regents Fellow and the program manager of the Flexible Pavement Program at TTI and is a registered professional engineer in the state of Texas. He has been involved with pavement research for 35 years and his current interests are in the areas of pavement rehabilitation, overlay design, non-destructive testing, and the development and implementation of new technologies for real-time quality control testing. As head of the Flexible Pavement Program he manages eight full-time researchers, several experienced technicians and graduate and undergraduate students. His program is active in many areas of pavement research including quality control measurements; soil stabilization; full depth reclamation; rubblization of concrete pavements; perpetual pavement design; forensic engineering; mechanistic pavement design and overlay design. The goal of the Flexible Pavement program is to conduct innovative multi-disciplinary research which provides the funding agency with products which can readily be implemented.

Mr. Scullion is an expert in using nondestructive testing to identify defects in engineering structures. He routinely uses both Falling Weight Deflectometers to measure structural strength and Ground Penetrating Radar (GPR) to identify and locate subsurface defects. Studies completed in Texas, on in-service pavements, demonstrated the ability of high speed air coupled GPR to accurately measure layer thicknesses, detect damage in surface and base layers, and detect areas of low density within asphalt layers. Mr. Scullion supervised the development of GPR interpretation software and also trained the Texas Department of Transportation (TxDOT) on where and how to use this technology. This technology has been used routinely since 2004 by TxDOT engineers to optimize pavement rehabilitation projects.

He has recently worked within Texas to develop and implement new tools for designing, constructing and monitoring both soils stabilization and full depth reclamation projects. Several major advances have been implemented in Texas as a result of these studies including new tools for measuring sulfate content in soils and the use of micro-cracking to minimize shrinkage cracking damage with cement treated bases. In the past 5 years Mr. Scullion has conducted studies for all the major suppliers of stabilizers including the Portland Cement Association (PCA), Lime Association and asphalt emulsion suppliers. He has recently developed the next generation of pavement design tools for the PCA to incorporate soil cement bases in pavement design. This software is currently being implemented by the PCA.

In the area of hot-mix asphalt design he has proposed the use of the balanced-mix design to aid in selecting the optimum asphalt content. Many of the innovations developed by the Flexible Pavements Program have been incorporated into TxDOT specifications. He has a solid working relationship with DOTs and has completed several major forensic investigations to identify the cause of premature pavement failures and the optimal repair options. By combining advanced non-destructive testing results with focused field validation coring, he has successfully identified problems with flexible, jointed and continuously reinforced concrete pavements in Texas. He has also played a lead role in the implementation of deflection-based pavement design systems. The MODULUS 6 backcalculation program was developed by TTI; it is widely used around the world for processing FWD data. Mr. Scullion was the lead investigator in the development of TxDOT?s flexible pavement design program (FPS 21), which is the recommended design systems for all flexible pavement designs in Texas.

He regularly trains on pavement design, soil stabilization, nondestructive testing and construction techniques for TxDOT, the Lime Association and PCA. He also teaches classes on highway materials for the National Highway Institute and methods of rehabilitating flexible pavements for TxDOT.

Mr. Scullion is an active member of the Transportation Research Board where he is former chairman of Committee A2B05 "Strength and Deformation of Materials." Mr. Scullion was awarded the HB Zachary Researcher of the Year award in 1996 for his important research in the areas of pavement design and nondestructive testing. He also received awards from the Texas DOT for innovative research in 2000, 2001 and 2003, and was awarded the Trinity Materials Senior Research of the Year award in 2005. He recently received Texas A&M University's 2011 Regents Fellow Award, the highest award for researchers in the university system.

Education

  • M.B.A., Specializing in MIS Development, Texas A & M University, 1984.
  • M.S., Materials Science, University of Sheffield, U.K., 1975.
  • B.S., Physics & Mathematics, University of Sheffield, U.K., 1973, Combined Honors.

Experience

  • Senior Research Engineer, Flexible Pavements, Texas A&M Transportation Institute, September 2005 - Present.
  • Program Manager, Flexible Pavements, Texas A&M Transportation Institute, June 1995 - Present.
  • Research Engineer, Flexible Pavements, Texas Transportation Institute, September 2000 - August 2005.
  • Associate Research Engineer, Flexible Pavements, Texas Transportation Institute, September 1991 - August 2000.
  • Assistant Research Engineer, Flexible Pavements, Texas Transportation Institute, September 1987 - August 1991.
  • Research Associate, Flexible Pavements, Texas Transportation Institute, February 1980 - August 1987.

Professional Registration

Registered Professional Engineer in Texas, Registration No. 62683.

Affiliations

  • Member, Transportation Research Board (TRB), Committee A2B05, Strength and Deformation of Materials.
  • Member, Transportation Research Board (TRB), Committee A2B52, Accelerated Pavement Testing.
  • Member, International Users Group for Ground Penetrating Radar.
  • Consultant, Saskatchwan DOT - Ground Penetrating Radar.
  • Workshop Chairman, Fourth International Conference on Ground Penetrating Radar.
  • Consultant, NAPA - Pavement Performance.
  • Consultant, World Bank - Pavement Management Systems.
  • Workshop Coordinator, 2nd Internatioinal Conference on Managing Pavements.

Selected Publications

F. Zhou, S. Hu, T. Scullion, S. Nazarian. Implementation of a Texas Mechanistic-Empirical Thickness Design System (TxME). 0-6622-S. Texas A&M Transportation Institute, College Station, TX. 2014.

S. Hu, F. Zhou, T. Scullion. Development of Texas Mechanistic-Empirical Flexible Pavement Design System (TxME). 0-6622-2. 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.

K.H. Stokoe, J. Lee, B.H. Nam, R. Hayes, T. Scullion, W. Liu. Developing a Testing Device for Total Pavements Acceptance. PSR. 0-6005-2. Texas A&M Transportation Institute, College Station, TX. 2013.

B.T. Wilson, T. Scullion, C.K. Estakhri. Design and Construction Recommendations for Thin Overlays in Texas. 0-6615-1. Texas A&M Transportation Institute, College Station, TX. September 2013.

L.F. Walubita, A.N. Faruk, Y. Koohi, R. Luo, T. Scullion, R.L. Lytton. The Overlay Tester (OT): Comparison with Other Crack Test Methods and Recommendations for Surrogate Crack Tests. 0-6607-2. Texas A&M Transportation Institute, College Station, TX. August 2013.

L.F. Walubita, J.K. Hoeffner, T. Scullion. New Generation Mix-Designs: Laboratory-Field Testing and Modifications to Texas HMA Mix-Design Procedures. 0-6132-3. Texas A&M Transportation Institute, College Station, TX. July 2013.

L.F. Walubita, T. Scullion. New Generation HMA Mix Designs: Accelerated Pavement Testing of a Type C Mix with the ALF Machine. 0-6132-2. Texas A&M Transportation Institute, College Station, TX. July 2013.

T. Scullion. TPAD Data Analysis Software and User Manual. 0-6005-P3. Texas A&M Transportation Institute, College Station, TX. June 2013.

F. Zhou, S. Hu, T. Scullion. Balanced RAP/RAS Mix Design and Performance Evaluation System for Project-Specific Service Conditions. 0-6092-3. Texas A&M Transportation Institute, College Station, TX. June 2013.

T. Scullion, C.K. Estakhri, B.T. Wilson. Use of Fine Graded Asphalt Mixes. PSR. 0-6615-S. Texas A&M Transportation Institute, College Station, TX. May 2013.

L.F. Walubita, S. Lee, A.N. Faruk, J.K. Hoeffner, T. Scullion, I. Abdallah, S. Nazarian. Texas Flexible Pavements and Overlays: Calibration Plans for M-E Models and Related Software. 0-6658-P4. Texas A&M Transportation Institute, College Station, TX. May 2013.

T. Scullion, L.F. Walubita, G. Das, H.A. Tanvir. Development and Field Evaluation of the Next Generation of HMA Mix Design Procedures. PSR. 0-6132-S. Texas A&M 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.

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

L.F. Walubita, A.N. Faruk, J.K. Hoeffner, T. Scullion. Search for a Test for Fracture Potential of Asphalt Mixes. PSR. 0-6607-S. Texas A&M Transportation Institute, College Station, TX. 2012.

T. Scullion, E.A. Kassem, E.A. Masad, A. Chowdhury, W. Liu, C.K. Estakhri, S. Dessouky. Develop Practical Field Guidelines for the Compaction of HMA or WMA. 0-6992-S. Texas Transportation Institute, College Station, TX. 2012.

F. Zhou, S. Hu, T. Scullion. Performance Evaluation and Mix Design for High RAP Mixture. PSR. 0-6092-S. Texas A&M Transportation Institute, College Station, TX. 2012.

T. Scullion, L.F. Walubita, F. Zhou. Next Generation Mix Design Procedures and Recommendations for Texas (Study 0-6132). 0-6132-P1. Texas A&M Transportation Institute, College Station, TX. December 2012.

T. Scullion, C.K. Estakhri, B.T. Wilson. Use of Fine Graded Mixes for Pavement Preservation: Workshop Materials. 0-6615-P2. Texas A&M Transportation Institute, College Station, TX. December 2012.

C.K. Estakhri, T. Scullion, X. Hu. Thin Overlay Mix Designs for West Texas Districts. 9-1529-P1. Texas A&M Transportation Institute, College Station, TX. November 2012.

L.F. Walubita, A.N. Faruk, J.K. Hoeffner, T. Scullion. The OT Tex-248-F Updates and Some Video Demos. 0-6607-P2. Texas Transportation Institute, College Station, TX. November 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.

K.H. Stokoe, J. Lee, B.H. Nam, M.W. Lewis, R. Hayes, T. Scullion, W. Liu. Development a Testing Device for Total Pavements Acceptance: Third-Year Report. 0-6005-4. Texas Transportation Institute, College Station, TX. August 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.

W. Liu, T. Scullion, E.A. Kassem. Development of TTI's Asphalt Compaction Monitoring System. 0-6992-1. Texas Transportation Institute, College Station, TX. July 2012.

L.F. Walubita, G. Das, E.M. Espinoza, J.H. Oh, T. Scullion, J.L. Garibay, S. Nazarian, I. Abdallah, S. Lee. Texas Flexible Pavements and Overlays: Year 1 Report - Test Sections, Data Collection, Analyses, and Data Storage System. 0-6658-1. Texas A&M Transportation Institute, College Station, TX. June 2012.

T. Scullion. FDR (Full-Depth-Reclamation) Process Video. 0-6271-P1. Texas Transportation Institute, College Station, TX. June 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.

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. Hu, F. Zhou, T. Scullion. Texas M-E Flexible Pavement Design System: Literature Review and Proposed Framework. 0-6622-1. Texas Transportation Institute, Houston, TX. April 2012.

S. Anderson, C.P. Beaty, L. Ding, D.R. Ellis, J.A. Epps, C.K. Estakhri, B.A. Glover, M.L. Hoelscher, N.D. Norboge, R. Rajbhandari, T.L. Ramani, T. Scullion, J.A. Shelton, C. Shon, W.R. Stockton, S.R. Vadali, S.P. Venglar, J. Zietsman. TxDOT Administration Research: Tasks Completed FY2011. 0-6581-TI-3. Texas Transportation Institute, College Station, TX. April 2012.

E.A. Kassem, T. Scullion, E. Masad, A. Chowdhury, W. Liu, C.K. Estakhri, S. Dessouky. Comprehensive Evaluation of Compaction of Asphalt Pavements and Development of Compaction Monitoring System. 0-6992-2. Texas Transportation Institute, College Station, TX. April 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, 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. Test Procedure for Surface Treatment Bond Test. 0-6271-P3. Texas Transportation Institute, College Station, TX. February 2012.

L.F. Walubita, A.N. Faruk, G. Das, H.A. Tanvir, J. Zhang, T. Scullion. The Overlay Tester: A Sensitivity Study to Improve Repeatability and Minimize Variability in the Test Results. 0-6607-1. 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.

L.F. Walubita, E.M. Espinoza, G. Das, J.H. Oh, T. Scullion, S. Nazarian, I. Abdallah. Texas Flexible Pavements and Overlays: Review and Analysis of Existing Databases. 0-6658-P6. Texas Transportation Institute, Houston, TX. December 2011.

L.F. Walubita, G. Das, E.M. Espinoza, J.H. Oh, T. Scullion, S. Nazarian, I. Abdallah, J.L. Garibay. Texas Flexible Pavements and Overlays: Data Analysis Plans and Reporting Format. 0-6658-P3. Texas Transportation Institute, College Station, TX. December 2011.

L.F. Walubita, T. Scullion, S. Nazarian. Materials and Performance Data for Texas Flexible Pavements and Overlays: Data Collection Plans. 0-6658-P1. Texas Transportation Institute, College Station, TX. December 2011.

F. Zhou, S. Hu, G. Das, T. Scullion. High RAP Mixes Design Methodology with Balanced Performance. 0-6092-2. Texas Transportation Institute, College Station, TX. November 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.

R.T. Baker, L. Ding, J. Epps, C.K. Estakhri, G. Fry, T.S. Geiselbrecht, V.D. Goodin, J.G. Hudson, T.J. Lomax, C.A. Morgan, J.P. Orsak, D.L. Schrank, T. Scullion, W.R. Stockton, S.P. Venglar, J.C. Villa, B.A. Wood, D.M. Winterich, R.E. Lee, J. Zietsman. TxDOT Administration Research: Tasks Completed FY2010. 0-6581-TI-2. Texas Transportation Institute, College Station, TX. February 2011.

T. Scullion, F. Zhou, E.G. Fernando, S. Hu. Develop Test Procedures to Characterize Material Response Behavior, and Transfer Functions for TxDOT M-E Design. 0-5798-S. Texas Transportation Institute, College Station, TX. 2010.

F. Zhou, E.G. Fernando, T. Scullion. Development, Calibration, and Validation of Performance Prediction Models for the Texas M-E Flexible Pavement Design System. 0-5798-2. Texas Transportation Institute, College Station, TX. August 2010.

W. Liu, T. Scullion. Progress During the First Year Towards Building the Total Pavement Acceptance Device (TPAD). 0-6005-1. Texas Transportation Institute, College Station, TX. August 2010.

L.F. Walubita, W. Liu, T. Scullion. The Texas Perpetual Pavements: Experience Overview and the Way Forward. Research Report. 0-4822-3. Texas Transportation Institute, College Station, TX. July 2010.

S. Hu, F. Zhou, T. Scullion. TxACOL Workshop - Texas Asphalt Concrete Overlay Design and Analysis System. 5-5123-03-P1. Texas Transportation Institute, College Station, TX. June 2010.

L.F. Walubita, T. Scullion. Texas Perpetual Pavements - New Design Guidelines. Research Report. 0-4822-P6. Texas Transportation Institute, College Station, TX. June 2010.

T. Scullion. Balanced Mix Design Report for Lufkin's Crack Attenuating Mix (CAM). 5-5598-01-1. Texas Transportation Institute, College Station, TX. May 2010.

L.F. Walubita, V. Umashankar, X. Hu, B.P. Jamison, F. Zhou, T. Scullion, A. Epps Martin, S. Dessouky. New Generation Mix-Designs: Laboratory Testing and Construction of the APT Test Sections. 0-6132-1. Texas Transportation Institute, College Station, TX. March 2010.

F. Zhou, G. Das, T. Scullion, S. Hu. RAP Stockpile Management and Processing in Texas: State of the Practice and Proposed Guidelines. 0-6092-1. Texas Transportation Institute, College Station, TX. February 2010.

T. Scullion. Technical Bulletin on Design and Construction of Crack Attenuating Mixes (CAM). 0-5598-P1. Texas Transportation Institute, College Station, TX. February 2010.

L.F. Walubita, T. Scullion. Monitor Field Performance of Full-Depth Asphalt Pavements to Validate Design Procedures. Research Report. 0-4822-S. Texas Transportation Institute, College Station, TX. February 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.

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.