Selected Recently Completed & Current HMA-Related Research Projects

Selected Recently Completed & Current HMA-Related Research Projects – Materials & Pavements Division of TTI

SPONSOR PROJECT TITLE RESEARCHER Cost, COMP. OBJECTIVES $ DATE

ICAR Examine Superpave Flat & Estakhri & 138K March Evaluate rutting resistance of HMA Elongated Aggregate Button, TTI, 2003 mixtures containing aggregates of different Specifications Texas A&M F&E from the same source

TxDOT Long-Term Research on Little, TTI with 600K August, Conduct a process review of testing and Bituminous Coarse Aggregate Jayawickrama, 2004 monitoring protocols in TxDOT=s Texas Tech Aggregate Quality Monitoring Program and develop system improvements Comprehensive study to provide tools to TxDOT Strategic study for Resolving Button, 653K August, design and control HMA. Addressing HMA Related Chowdhury, 2004 HMA specimen preparation; prediction of Estakhri rutting, fatigue, and moisture damage; and simple performance tests. Develop database for production mixes. Develop criteria needed to guide a TxDOT Develop Guidelines for Placing Estakhri 175K August pavement designer: if and how to place an UnderSeal (prior to overlaying) 2003 effective underseal.

Civil En Evaluate RSST-CH and APA for Dpt Developing a Framework for A. Epps Martin 35K Dec. predicting rutting using WesTrack data & Texas A&M Using APT in HMA Mixture 2003 finite element simulation of the (Research Design accumulated permanent deformation. Innovation Program) August Evaluate and select design and analysis TxDOT Evaluate the Fatigue Resistance A. Epps Martin 295K 2004 system for fatigue resistance of asphalt of Rut Resistant Mixes concrete Dec Evaluate applicability of simple FHWA Superpave Performance Testing Button, 50K 2003 performance tests and others (FSCH-SST, Chowdhury APA, Hamburg) on HMA mixtures from Ark, Az, La, NM, Ok, Tx. March Update the seal coat manual providing TxDOT Develop Estakhri 46K 2003 guidelines on pavement selection, design, TxDOT Seal Coat Manual inspection and construction. SPONSOR PROJECT TITLE RESEARCHER Cost, COMP. OBJECTIVES $ DATE Further development of NDT Evaluation of non nuclear devices (PQI TxDOT devices to identify segregation Scullion 150K Sept and Pavetracker) also further development in HMAC Chowdhury 2004 of both IR and GPR technologies Developing an Upgraded To test the cracking potential of 10 TxDOT Overlay Tester to Characterize Zhou 200K Sept different binders in use in Texas. Develop Reflection Cracking Resistance Scullion 2004 an upgraded overlay tester unit for delivery of Asphalt Concrete to TxDOT To develop and teach a school on TxDOT Flexible Pavement Scullion 20K Contin- evaluating flexible pavements, interpreting Rehabilitation Training Courses uing distress types and the use of non destructive testing and pavement design tools. CD available. Conduct sensitivity analysis of the primary TxDOT Strategic Plan for Tom Freeman 160K August design modules for new, restoration, and Implementation of the AASHTO overlay pavements. Review TxDOT’s 2004 2002 Design Guide for TxDOT current pavement design approach & compare with the 2002 Guide. Develop calibration data for the models. Test Methods for Characterizing Masad, Button, Dec. Develop method for measuring the shape NCHRP Aggregate Shape, Texture, and Little and 500K 2004 characteristics of aggregates. 4-30A Angularity Tutumluer from UI National Microstructure Characterization August Simulation of fluid flow in asphalt Science and Modeling of Geomaterials Masad 375K 2007 pavements and unbound layers Foundation (NSF) February Develop advanced methods for FHWA Simulation, Imaging and Masad 360K 2008 characterization the internal structure of Mechanics of Asphalt Mixes asphalt mixes and simulation of behavior under loading

Dec Develop surface energy measurements to NCHRP Surface Energy Measurements Little 450K 2005 identify moisture-susceptible HMA mixes. 9-37 to Select Materials for Asphalt Lytton Pavements