Geotextiles (a type of geosynthetic) used as a separation layer between subgrade and granular sub-base in a road pavement function by:
Choose the correct answer
Providing tensile reinforcement in the pavement structure only
Preventing intermixing of fine subgrade soil with the coarser granular layer while allowing water drainage through the filter
Waterproofing the pavement
Acting as a vapour barrier
Correct Answer
B. Preventing intermixing of fine subgrade soil with the coarser granular layer while allowing water drainage through the filter
Why is this the answer?
Geotextile functions: separation (keep layers distinct), filtration (allow water through, retain soil particles), drainage (transmit water in plane), reinforcement (tensile resistance), protection. For road sub-base separation: nonwoven or woven geotextile with appropriate AOS (Apparent Opening Size) to retain subgrade fines while permitting drainage.
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