Jo Sias Daniel

Jo Sias Daniel


Research Group: Materials 


  • Ph.D., Civil Engineering, North Carolina State University, May 2001
  • M.S., Civil Engineering, North Carolina State University, August 1996
  • B.S., Civil Engineering, University of New Hampshire, May 1994

Research Overview

Dr. Daniel has research interests in the area of asphalt concrete. Her research focuses characterization of asphalt concrete materials, performance of flexible pavements, recycled materials, and the impact of climatic effects, specifically related to climate change on pavement structures (

Current Projects

NCHRP 9-58: The Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios
Funded by National Cooperative Highway Research Program
Project Lead: Texas A&M Universtiy/Texas Transportation Institute
Research Partners: University of Nevada Reno

Project information:

TPF 5(230): Northeast High RAP Pooled Fund Study
Funded by various state DOTs and FHWA
Research Partners: NC State Univ, Rutgers Univ, UMass Dartmouth 

In this project, over 30 different plant produced mixtures with RAP contents up to 40% by total weight of mixture are being evaluated.  Testing is focusing on fatigue and low temperature cracking using a suite of mixture and binder testing.  The impact of binder grade, RAP level, asphalt content, and production parameters are being evaluated.

Performance of High RAP Pavement Sections in NH
Funded by NHDOT

There are two phase of this project:

  1. Conduct forensic analysis on the existing high RAP section and a comparable virgin section to evaluate the material properties and characteristics of the existing mixture with respect to the observed performance.
  2. Evaluate the performance in terms of low temperature cracking, fatigue cracking, and moisture sensitivity of six new RAP mixtures in the laboratory and field

Can We Use More RAP? New specifications for RAP/RAS mixtures in NH.
Funded by NHDOT

This project will evaluate 25 different plant produced mixtures containing various levels and combinations of RAP/RAS, binder grades, and binder sources.  The plant mixed, plant compacted specimens will be compared with laboratory mixed, laboratory compacted specimens with the goal of developing specifications based on laboratory mixtures.

NETC 07-1 In-Place Response Mechanisms of Recycled Layers Due to Temperature and Moisture Variations
Funded by New England Transportation Consortium
Research Partners: Worcester Polytech Inst, UMass Dartmouth, Forest Service

The main objective of this project is to determine the in-place properties of pavement cross-sections containing recycled materials common to the New England region, and to relate changes in those properties to variations in temperature and moisture.  The study will focus primarily on obtaining field data from base layers that have been constructed with different types of unbound or bound recycled layers such as full depth reclamation (with or without stabilizing additives), plant mix recycled asphalt pavement (PMRAP), or foamed asphalt. 

FHWA Flooded Pavement Assessment
Funded by FHWA
Research Partners: Worcester Polytech Inst, Villanova Univ, Infrasense

The objective of this project is to develop guidelines for short-term assessment of flooded pavements for the purpose of determining the optimum time to reopen a road to different types of traffic. The product will be a set of guidelines that will provide decision makers with the ability to assess flooded pavements using a rational methodology to determine the required testing based on available resources and risk assessment. The guidelines will address the assessment of flooded pavements based on performance properties and an understanding of the reduced structural capacity of roadway systems after a flood event.

Developing a Performance-Related Specification Program for Rhode Island
Funded by RIDOT
Research Partner: Villanova Univ

The objective of this project is to develop pay adjustment factors for typical RI DOT asphalt concrete mixtures.  The pay adjustment factors will be based on pavement life differences predicted using measured material properties and distress models from performance related specification software. The scope of the project will include evaluation of two typical surface mixtures and a base mix (that contains between 15 to 25% reclaimed asphalt pavement) for non-interstate highways.


Recent Publications

  1. Barry, K., J.S. Daniel, and D. Boisvert (2014). "Forensic Analysis of Long Term Aged Hot Mix Asphalt Field Cores Containing Reclaimed Asphalt Pavement”, International Society for Asphalt Pavements, Raleigh, N.C.
  2. Mensching, D., J.S. Daniel, T. Bennert, M. Medeiros, M. Elwardany, W. Mogawer, E. Hajj, and M. Alavi (2014). “Low temperature properties of plant-produced RAP mixtures in the Northeast”, International Journal of Road Materials and Pavement Design, in press.
  3. Bennert, T., J.S. Daniel, and W. Mogawer (2014). “Strategies for Incorporating Higher RAP Percentages: Review of Northeast States Implementation Trials”, Transportation Research Record: Journal of the Transportation Research Board, in press.
  4. Mallick, R., M. Radzicki, J.S. Daniel, and J. Jacobs (2014). “Use of System Dynamics to Understand Long-Term Impact of Climate Change on Pavement Performance and Maintenance Cost”, Transportation Research Record: Journal of the Transportation Research Board, in press.
  5. Daniel, J.S.,  J. Jacobs, E. Douglas, R. Mallick, and K.Hayhoe (2014). “Impact of Climate Change on Pavement Performance: Preliminary Lessons Learned through the Infrastructure and Climate Network (ICNet)” Climatic Effects on Pavement and Geotechnical Infrastructure: pp. 1-9.
  6. Daniel, J. S. (2013). Recycling with RAP, RAS and Secondary Aggregates.  Asphalt Paving Technology Journal: Association of Asphalt Paving Technologists Annual Meeting, Denver, CO.
  7. Jacobs, J.M. P.H. Kirshen, and J.S. Daniel (2013). Considering Climate Change in Road and Building Design. EOS Transactions. 94(30). DOI: 10.1002/2013EO300008.
  8. Barry, K., J.S. Daniel, J.Foxlow, and K Gray (2013). “An evaluation of reclaimed asphalt shingles in hot mix asphalt by varying sources and quantity of reclaimed asphalt shingles”, International Journal of Road Materials and Pavement Design Vol.15, Iss.2, 259-271.
  9. Daniel, J.S., N. Gibson, S.Tarbox, A. Copeland, and A. Andriescu (2013). “Effect of Long-Term Aging on RAP Mixtures: Laboratory Evaluation of Plant Produced Mixtures”, International Journal of Road Materials and Pavement Design Vol.14, Sup.2, 173-192.
  10. Anderson, E., and J. S. Daniel (2013). “Long-Term Performance of Pavement with High Recycled Asphalt Content: Case Studies”, Transportation Research Record: Journal of the Transportation Research Board 2371:1-12.
  11. Bhattacharjee, S., A.K. Swamy, and J.S. Daniel (2012). "Continuous Relaxation and Retardation Spectrum Method for Viscoelastic Characterization of Asphalt Concrete." Mechanics of Time Dependent Materials Vol.14, Iss. 3, 287-305.
  12. Meagher, W., J.S. Daniel, J. Jacobs, and E. Linder (2012). "A Methodology to Evaluate the Implications of Climate Change on the Design and Performance of Flexible Pavements." Transportation Research Record: Journal of the Transportation Research Board 2305:111-120.
  13. Mogawer, W., T. Bennert, J.S. Daniel, R. Bonaquist, A. Austerman, and A. Booshehrian (2012). "Performance Characterisitcs of Plant Produced High RAP Mixtures." International Journal of Road Materials and Pavement Design Vol.13, Sup. 1, 183-208.
  14. Swamy, A. K., and J.S. Daniel (2012). "Evaluating the Effect of Mode of Loading on Viscoelastic and Damage Properties of Asphalt Concrete." Transportation Research Record: Journal of the Transportation Research Board 2296:144-152.
  15. Tarbox, S. and J.S. Daniel (2012). "Effects of Long Term Oven Aging on RAP Mixtures." Transportation Research Record: Journal of the Transportation Research Board 2294:1-15.
  16. W.S. Mogawer, A.J. Austerman, J.S. Daniel, F. Zhou and T. Bennert (2011). “Evaluation of the Effects of Hot Mix Asphalt Density on Mixture Fatigue Performance, Rutting Performance and MEPDG Distress Predictions.” International Journal of Pavement Engineering (IJPE) 12(2): 161-175.
  17. Foxlow, J., J.S. Daniel, and A.K. Swamy (2011). "RAP or RAS? The Differences in Performance of HMA Containing Reclaimed Asphalt Pavement and Reclaimed Asphalt Shingles." Journal of the Association of Asphalt Pavement Technologists 80: 347-376.
  18. Medeiros Jr., M., J.S. Daniel, H. Bolton and W. Meagher (2011). "Evaluation of Moisture and Low Temperature Cracking Susceptibility of Warm-Mixture Asphalt." International Journal of Pavement Engineering iFirst 13 June 2011.
  19. Swamy, A.K., L.F. Mitchell, S.J. Hall, and J.S.Daniel. (2011). "The Impact of RAP on the Volumetric, Stiffness, Strength and Low Temperature Properties of HMA." Journal of Materials in Civil Engineering 23(11): 1490-1497.
  20. Daniel, J.S., J. Pochily, and D. Boisvert (2010). "Can More Reclaimed Asphalt Pavement Be Added?  Study of Extracted Binder Properties from Plant Produced Mixtures with up to 25% Reclaimed Asphalt Pavement." Transportation Research Record: Journal of the Transportation Research Board 2180: 19-29

Professional Activities:

  • Transportation Research Board
  • Association of Asphalt Paving Technologists: Director-at-Large
  • FHWA Asphalt Mixtures and Construction Expert Task Group
  • Associate Editor for International Journal of Road Materials and Pavement Design
  • American Society of Civil Engineers
  • International Society for Asphalt Pavements
  • National Society of Professional Engineers
  • Northeast Asphalt User/Producer Group

Professional Affiliations

  • Transportation Research Board
  • Chair of Committee AFK50
  • Member of Committee AFK30
  • Association of Asphalt Paving Technologists
  • FHWA Mixtures Expert Task Grou
  • American Society of Civil Engineers
  • International Society for Asphalt Pavements
  • National Society of Professional Engineers
  • New England Transportation Technician Certification Program
  • Northeast Asphalt User/Producer Group

Courses Taught

  • CiE 526 Mechanics of Materials
  • CiE 622 Engineering Materials
  • CiE 723/823 Bituminous Materials and Mixtures
  • CiE 796/896 Pavement Maintenance and Rehabilitation
  • CiE 900/901 Graduate Seminar

Graduate Students

Undergraduate Students

2013-14 Research Group

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Portrait of Dr. Jo Sais Daniel
Kingsbury Hall Room W183B
33 Academic Way
Durham, NH 03824
(603) 862-3277
(603) 862-2364