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One option might be to reinforce and isolate the sub-grade with a geo-textile or something similar. If a conventional geo-textile is not available, you could see what similar local resources exist. Some grain sacks are made of woven slit-film, which is essentially a geo-textile. In Sri Lanka, we had a road project where Palmyra leaves were laid in a mat, with a lot of overlapping, and then topped by a few inches of crushed stone for a running surface. The fibres in the leaves, randomly cross-laid, accomplished the same effect. The geo-textile of fibrous material could be placed directly on the fine soil and then topped off with 15-25 cm of better material such as crushed stone, bank-run gravel, or whatever you can find. This approach won't eliminate the need for surfacing, but should reduce the required thickness.
Regards,
Dave Sacco
One option might be to reinforce and isolate the sub-grade with a geo-textile or something similar. If a conventional geo-textile is not available, you could see what similar local resources exist. Some grain sacks are made of woven slit-film, which is essentially a geo-textile. In Sri Lanka, we had a road project where Palmyra leaves were laid in a mat, with a lot of overlapping, and then topped by a few inches of crushed stone for a running surface. The fibres in the leaves, randomly cross-laid, accomplished the same effect. The geo-textile of fibrous material could be placed directly on the fine soil and then topped off with 15-25 cm of better material such as crushed stone, bank-run gravel, or whatever you can find. This approach won't eliminate the need for surfacing, but should reduce the required thickness.
Regards,
Dave Sacco
Dave