Geotextile Functions, Uses and Classes
Geotextile Functions: General Overview
To understand geotextile functions, first consider the definition in Bina Marga (Directorate General of Highways) specification 003/BM/2009. A geotextile is a generally permeable textile material installed on foundations, soil, rock or other geotechnical materials as an integral part of a structural system. Geotextile products are manufactured materials.
Based on the Bina Marga and AASHTO M288-06 specifications, geosynthetics are grouped into 3 classes according to their survivability during installation:
– Class 1: For site conditions with the potential to damage geotextiles
– Class 2: For typical site conditions
– Class 3: For site conditions with no or low potential to damage geotextiles
Read Also: Differences Between Woven and Non-Woven Geotextiles
Geotextile Functions
Geotextile for Subsurface Drainage
How should a geotextile be selected for drainage?
A drainage geotextile must have good permeability to convey water into the subsurface drainage system. Its primary function is filtration.
In general, drainage applications usually use Class 2 geotextile. The selection of permittivity and pore size values depends on the local soil particle size.
Geotextile Separator
What are the specifications for a geotextile separator? What is a Class 1 geotextile separator?
This specification applies to geotextiles that prevent the subgrade or soft soil from mixing with the aggregate above it (base course or subbase course). It applies when a construction project requires two different materials to be separated but drainage through the geotextile is not the primary function.
A geotextile separator is used for a CBR greater than 3 and applied over unsaturated subgrade. A geotextile used as a separator must meet the following requirements.
Geotextile Stabilizer
A geotextile stabilizer is applied to wet, water-saturated soil. In stabilization applications, the geotextile serves as a separator and filter. A geotextile stabilizer is usually applied to soil with a CBR value of 1% to 3%.
The following specifications are the geotextile requirements for stabilization, based on regulations from the Ministry of Public Works and Housing (PUPR).
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