Application of a highly modified asphalt binder for protection from water intrusion into wooden railroad ties

Abstract

Methods for applying a weather-proofing asphalt membrane composition to wooden railroad ties is disclosed. The asphalt membrane composition generally comprises an asphaltic binder, an elastomeric polymer, a wax modifier, a thickener, fumed silica and/or fumed alumina, and/or a saponified fatty acid and resin acid gelling compound. In one embodiment, the asphalt membrane composition is sprayed as a hot liquid onto the surface of the railroad tie. In other embodiments, preformed pads comprising asphalt membrane composition are applied, using to heat, to the surface of the railroad tie. Optionally, an aggregate cover is applied with or to the asphalt membrane composition. The asphalt membrane composition is formulated to reduce the water permeability of the tie, and protect the tie from degradation due to moisture, UV radiation, and extreme temperatures, thus prolonging the usable lifespan of the wooden railroad tie.

Dependencies are inferred from the claim text.