Permanent deformation and fatigue characteristics of SMA mixtures

Document Type

Conference Proceeding

Publication Date

12-1-1996

Abstract

The Hale Boggs Bridge, crossing the Mississippi River at Luling, Louisiana, was opened to limited traffic in 1983. It is a cable stayed bridge utilizing an orthotropic steel deck. The original surfacing of the deck was an epoxy asphalt mixture. Soon after construction, the deck began to delaminate and experienced extreme shoving and permanent deformation due to nonuniform breakdown of the epoxy asphalt binder in some areas leaving the base AC-20 to perform as the binder material. This paper presents the preliminary laboratory HMA mixture design to resist permanent deformation and provide extended fatigue life for the harsh environmental conditions and performance requirements experienced on the steel deck. The mix design incorporated polymer modification, SUPERPAVE performance graded binder specifications and European stone mastic asphalt technology. Four specialized polymer modified asphalt binders which were requested to meet SUPERPAVE designated PG 88-22 grading were evaluated in both SMA and conventional Louisiana Type 8 mix designs. In addition, an asphalt-rubber binder modified with SBS was considered in an SMA mix design. Each mix was characterized by fundamental engineering properties including indirect tensile creep and fatigue. Overall, a Styrelf asphalt meeting SUPERPAVE PG 88-22 grading in a SMA demonstrated better laboratory performance relative to other specialized asphalt cements and conventional Type 8 wearing course combinations.

Publication Source (Journal or Book title)

Proceedings of the Materials Engineering Conference

First Page

622

Last Page

630

This document is currently not available here.

Share

COinS