The University of Texas at El Paso (UTEP)

Transcription

1 The University of Texas at El Paso (UTEP) 80% Hispanic Center for Transportation Infrastructure Systems (CTIS) Designated as National and Regional University Transportation Centers Access and Excellence

2 Facilities Modern Materials Laboratory SHRP Asphalt Laboratory Simple Performance Tests Laboratory for Engineering and Environmental Geophysics Excellent Simulation and Computational Facility 2

3 CTIS Staff 8 Core Faculty 8 Contributing Faculty 4 Research Engineers Approx. 50 students 3

4 Recent Research Sponsors Texas Department of Transportation Federal Highway Administration National Cooperative Highway Research Program Army Engineer Research and Development Center Federal Railroad Administration A model of Excellence for Transportation Research in Minority Serving Institutions by FHWA

5 Improved Overlay Tester for Fatigue Cracking Resistance of Asphalt Mixtures OT Systems: a) Shedworks b) Cooper c) AMPT Goal: To evaluate consistency and to improve repeatability of OT results 5

6 Research Methodology Sources of Variability Asphalt Concrete Materials Specimen Preparation Process Natural heterogeneity from HMA Proposed Detailed Gluing Method Included Mixtures 1. TOM 2. SMA-D 3. SP-C 4. Type-C 5. SMAR-F 6. SP-D 7. Type-D Testing Method Data Analysis Investigation of Test Response Curves Alternative Parameters and Failure Criteria Research Approach Examining legacy data Using synthetic specimens Employing digital image correlation Conducting lots of OT tests 6

7 Normalized load Load, lbs Final Outcome Systematic Specimen Preparation Consistent Results 0 OK!! Acceptable Repeatability (COV <20%) Critical Fracture Energy, Number of Cycle Crack Progression Number of Cycles to Max Mix Parameters Load, lbs in.-lbs/in. 2 Rate Failure Average Type C COV 4% 9% 6% 27% Average SP-D 1 COV 4% 5% 7% 35% Displacement, in. Specimen Preparation Process 7

8 Validation OT Analysis Online Tool Interpretation of OT Test Results Specimen Preparation Process We can use your OT legacy data if you have solid performance data!! 8

9 Develop Guidelines and Design Program for Hot-Mix Asphalts Containing RAP, RAS, and Additives through a Balanced Mix- Design Process Goal: To evaluate current AC mix-design process, protocols and specifications, and develop a program and testing protocols for well performing AC mixes 9

10 Research Tasks/Approaches Past Proposed AC Mix-Design Procedures Review of Specifications, and Guidelines Current Practices on Mix-Design Process Linked TxDOT Databases (PERMIT Tool) Database of 100 project level section (TxDOT ) Proposed OT method under TxDOT Indirect Tensile Test Hamburg Test Asphalt Binder Testing Promising Performance Test Protocols Field Performance Evaluation and Validation Balanced Mix-Design Concept Performance of AC Mixes in Texas Practices of Industry and TxDOT Districts Collaboration with Districts and Producers Surveys, Conference Calls and Meetings

11 Comprehensive Evaluation PERMIT Tool Sections from TxDOT PMIS Color-Coded Mapping Sections in Texas 11

12 Thank you!! We appreciate your input and cooperation 12