Use of Geotextile with Wicking Yarn in Pavement Structure

Abstract

Engineered fill structures used in transportation infrastructure, such as roads, railways, and airport runways, are constructed under moisture conditions where the soil is compacted to its maximum dry density and remains unsaturated with water. Geotextiles are used for layer separation, water filtration, and reinforcement of the fill material. Geotextiles help prevent the mixing of subgrade and filled soils, facilitate water drainage, and enhance the strength of the fill layers. However, the strength and permeability of the soil depend on its moisture content and matric suction. Conventional geotextiles in contact with soil may temporarily act as a capillary barrier until the soil reaches a saturated state. In contrast, wicking geotextiles, which contain wicking fibers, can wick water out of unsaturated soils, increasing the resilient modulus of the soil and improving the overall performance of the roadway. Moreover, wicking geotextiles are more effective than conventional geotextiles at removing infiltrating water during rainfall events. This article also reviews and discusses relevant research and case studies of this geotextile.