Strength and Permeability of Biostabilized Sand

Abstract

Shallow backshore sands in the coastal zone are continually left in a relatively loose state due to coastal processes and human behavior. Because of this, backshore construction usually involves some form of soil improvement or alternative foundation design. To address these issues, an investigation into the application of an eco-friendly organic acid for soil improvement is conducted. Test results show the organic acid focuses on the proliferation of local microbes to cement and restructure the sand matrix, thus making the application a more sustainable option. Unconfined compression, California bearing ratio, and permeability tests were performed to assess the degree to which the sample sand was improved. After 96 days, results showed compressive strength to increase by at least 60 % and a decrease in permeability of at least 49 %. California bearing ratios increased modestly. The results are promising and shed some light into the application of an organic acid for soil improvement.