What is a geotextile used for in civil construction?

Geotextiles are specialized fabrics commonly used in civil construction primarily for their functionality in filtration and stabilization. When incorporated into soil and construction projects, geotextiles serve important roles in separating soil layers, allowing water to pass through while preventing the mixing of soil and aggregates. This filtration capability is essential in applications like drainage systems, retaining walls, and roadway construction.

Additionally, geotextiles contribute to stabilization by providing reinforcement to the soil, improving load distribution, and enhancing the overall stability of slopes and embankments. Their ability to prevent erosion and control sediment runoff further underscores their critical role in maintaining the integrity of construction projects.

While insulation against heat, signage and wayfinding, and waterproofing structures are important aspects of civil engineering, they are not primary functions of geotextiles. Thus, the correct answer highlights the specific roles that geotextiles play in enhancing the performance and longevity of civil constructions.