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Many asphalt mixtures are available to extend service life. Given that subgrade is stabile, the primary reason for degradation is oxidation at the surface. One of the most practical and available admixture materials is scrim rubber from ground up automobile tires. Ongoing maintenance for asphalt ...

Assuming adequate subsurface drainage, perhaps the sub-grade is pumping into the base course. This could be prevented by using fabric under the base course. ------------------------------ Daniel Clark P.E., M.ASCE Consulting Civil Engineer Auburn CA ------------------------------