Development of An Advance Overlay Design System Incorporating Both Rutting and Reflection Cracking Requirements Rick Collins TxDOT.

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Presentation transcript:

Development of An Advance Overlay Design System Incorporating Both Rutting and Reflection Cracking Requirements Rick Collins TxDOT

Development and Implementation of an Advanced overlay design system for TxDOT TxDOT Research 5123 Products: 1) Overlay Tester 2) Overlay Thickness Design Software Status: 1) Implemented for several mixes 2) Training schools underway Innovation: Estimation of both rutting and reflection cracking when selecting overlay type and thickness

Everyday TxDOT designers are often designing HMA overlays for Cracked pavements Products developed help to optimize design

Key steps for Successful Overlays Project Evaluation Is an overlay the answer ? Performance Evaluation + NDT Identification of pretreatments Mix design (balance of properties) Thickness Design Quality Control in the Field

Lab testing: Balanced Mix design The balance mix design requires to use the Hamburg Wheel to measure rutting potential and the Overlay tester to evaluate Cracking potential Hamburg Wheel Tracking Device Overlay Tester Designing mixes with a good balance of rutting and cracking resistance

Balanced Mix Design Concept ( AC content window with adequate rutting and cracking resistance) Does not work for all aggregates and PG grade combinations This graph show the rutting results in green. As the asphalt content increases the rutting increases. The cracking resistance is shown in red. The cracking resistance is measured in number of cycles to brake the sample in the overlay tester. A mix complies with a balance design when the asphalt content complies with acceptable values for rutting and cracking. This area is the yellow portion.

Overlay Design program HMA Rutting and Reflection Cracking Faculty Web Pages Using Spartan Web Wizard Overlay Design program HMA Rutting and Reflection Cracking 11/18/2018 Input Output Status information CFD&S, SJSU 7

Overlay Life predictions Faculty Web Pages Using Spartan Web Wizard 11/18/2018 Overlay Life predictions Type C Mix Type SMA Thickness 1.5 ins 3 ins 5 ins CFD&S, SJSU 8

Summary Overlay Tester developed to measure crack resistance of new overlay materials Overlay Tester implemented for several Texas mixes New pavement design software developed to predict overlay performance based on Existing Pavement condition and distress Traffic Environment Proposed overlay type and thickness Default material properties available for all standard TxDOT mixes Training schools underway