1 / 16

FHWA s Accelerated Testing Facility ALF and FWDs

verrill
Download Presentation

FHWA s Accelerated Testing Facility ALF and FWDs

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    2. Advantages of APT (Mechanical Testing) fast better construction quality easier performance monitoring can design to fail can control environment

    3. Two Accelerated Loading Facility (ALF) Machines ALF 2 cost about $1.9 million Two Accelerated Loading Facility (ALF) Machines ALF 2 cost about $1.9 million

    4. Load range from 10 to 20 kips Single or dual tires One direction with or without wander Temperature control capability 8400 loads per day Up to 50,000 loads per week ALF phase 3 study includes 12 Lanes Up to 48 test sites Each site 45 feet longLoad range from 10 to 20 kips Single or dual tires One direction with or without wander Temperature control capability 8400 loads per day Up to 50,000 loads per week ALF phase 3 study includes 12 Lanes Up to 48 test sites Each site 45 feet long

    5. Accelerated Loading Facility (ALF) Overall Dimensions: 94ft. x 12ft. x 19ft. Wheel Size: Dual- 11in. x 22.5in. Wheel Load: 7.5 kip - 19 kip Wheel Speed: 2.5 mph -11.0 mph Transverse Wheel Wander Controlled Pavement Temperature

    6. Facility

    8. FHWA ALF Tests 1986-89 Initial Tests WASHTO Field Tests -92 Super Single Tire Test 1993-Present Superpave Validation 1998-2000 Ultra-Thin Whitetopping

    9. Next ALF Experiment Full-scale accelerated performance testing for Superpave and structural validation Pooled fund Construction in Spring 2002

    10. Next ALF Experiment Main focus: Validation of proposed changes to the Superpave binder specification to address modified binders Validation of the proposed Superpave simple performance test Validation of the proposed 2002 Pavement Design Guide models

    11. Next ALF Experiment Other possible studies Evaluation of performance of recycled materials in base courses Evaluation of crumb rubber modified (CRM) asphalt pavement FWD evaluations

    12. FWD Evaluation Investigation of the use and comparability of FWDs with modified, recycled, and conventional materials Sensitivity to various materials Comparability between devices

    14. Possibilities Superpave 3 Modified Binders, 1 Control 2002 Design Guide 4 Additional Sections Recycled Materials 2 Additional Sections with Recycled Base Material

    15. Test Matrix

    16. FWD Users Group Recommendations? Feedback?

More Related