01044234

Component

An asphalt mixture generally behaves as an insulator. The addition of electrically conductive additives may produce conductive asphalt mixtures. The present study investigated effectiveness of several commonly used conductive additives to produce electrically conductive HMA. Effects of three conductive additives, a micron-scale steel fiber, a carbon fiber, and graphite, on some laboratory-measured properties of HMA mixtures were investigated through mixture performance testing. The results from this study indicated that the micron-scale steel fiber was the most effective additive to produce conductive HMA. The inclusion of steel and carbon fibers improved permanent deformation properties, maintained the indirect tensile cracking resistance, and slightly reduced the dynamic modulus of the conductive HMA. The inclusion of graphite as an electrically conductive additive significantly improved the rut-resistance, increased the dynamic modulus, but significantly decreased the indirect tensile cracking resistance of the conductive HMA mixtures.

01042056

07-2623

English

22p

2007

Transportation Research Board 86th Annual Meeting

CD-ROM

Figures (11) ; References (11)

Additives; Asphalt mixtures; Carbon fibers; Dynamic modulus of elasticity; Electrical conductivity; Graphite; Hot mix asphalt; Ruts (Pavements); Rutting; Steel fibers; Tensile strength

Fracture resistance

Highways; Materials; I31: Bituminous Binders and Materials

Transportation Research Board Annual Meeting 2007 Paper #07-2623

TRIS, TRB

Feb 8 2007 7:19PM