Evaluation on field application of emulsified asphalt seed mixture for slope stabilization

초록

Slope greening can mitigate surface erosion and protect transportation infrastructure in mountainous regions. This study evaluated emulsified asphalt (EA) seed mixtures as a supplementary treatment for vegetation establishment and surface stabilization. Spraying and mixing methods were compared through laboratory assessments of seed germination, moisture retention, simulated rainfall response, and soil chemical properties at different EA contents. Field trials were conducted on mounding and cutting slopes, with vegetation coverage quantified using Python-based image analysis. Spraying retained more moisture than mixing, whereas differences in soil temperature, pH, and electrical conductivity were minor. Increasing EA content reduced moisture loss and maintained the integrity of the vegetation-base material during rainfall exposure. Germination responses were species-dependent: perennial ryegrass achieved 97% germination with and without EA coating, whereas other species showed reductions of 2？16 percentage points. Increasing EA content reduced cation exchange capacity and total nitrogen, although both remained above the specified criteria. Field performance varied with slope condition and monitoring period. EA treatments did not consistently outperform conventional treatments on the mounding slope, while EA5 and EA10 achieved higher two-month coverage on the cutting slope. Overall, EA seed mixtures may improve moisture retention and support vegetation establishment when optimized for dosage, species, site conditions.

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