Evaluating Different Ways to Predict Pavement Cracking Performance - - PowerPoint PPT Presentation

Evaluating Different Ways to Predict Pavement Cracking Performance

NCAT Test Track Pavements (7-inch) FHWA ALF Pavements (4-inch)

S-VECD/LVECD Prediction

Constant Stress/Strain Based Prediction

Number of Cycles to Failure

εt

NCAT Mixtures & Test Sections

3.00” (76 mm) 2.75” (70 mm) 1.25” (32 mm) 6.00” (152 mm)

Surface (9.5 mm) Intermediate (19 mm) Base (19 mm) Dense Graded Aggregate Base Stiff Subgrade Mixtures Label Control C OGFC O High RAP R RAP+WMA RW Foam WMA FW Evotherm WMA AW

Laboratory-to-Field Correlation

NCAT Sections

LVECD Analysis Field Cracking Data

O AW FW R,RW,C AW R FW RW C O

LVECD Predictions of NCAT Pavements

Using Controlled-Strain Mode

Using Different Modes of Loading

Controlled-Strain Mode Controlled-Stress Mode

S-VECD Predictions on NCAT Pavements (7-inch)

Strain-Based Stress-Based

Controlled-stress assumption is better for 7-inch pavements!

Laboratory-to-Field Correlation

FHWA-ALF (100 mm Pavement)

LVECD Analysis Field Cracking Data

Control SBS Crumb Rubber (Terminal Blend) Terpolymer

Crushed Stone Aggregate Base

100 mm

LVECD Predictions of ALF Pavements

S-VECD Predictions on ALF Pavements (4-inch)

Strain-Based Stress-Based

Controlled-strain assumption is better for 4-inch pavements!

Ranking based on Energy (GR)

NCAT Pavements ALF Pavements

LVECD Predictions

NCAT Pavements ALF Pavements