Geotechnical changes of Thypha domingensis fiber-derived geotextile under degradation due to climatic variables

Abstract

Geotextiles made from plant fibers creates a suitable environment for plant growth as part of soil bioengineering techniques. The faster decomposition of plant fiber geotextiles compared to synthetic ones demands the use of composites that enhance their waterproofing and extend their durability in the environment. The objective of this work was to assess the resistance of a geotextile made with Thypha domingensis to degradation caused by climatic variables. Tensile strength tests were conducted in the laboratory in order to evaluate the degradation of geotextiles treated with single and double layers of waterproofing resin. Based on Scanning Electron Microscopy (SEM) images, it was verified that applying waterproofing resin twice delays the degradation of the fibers for up to 120 days of exposure to the effects of climatic variables other than temperature. The maximum resistance losses due to the geotextile's exposure to degradation were statistically significant for the all three treatments: control-without waterproofing resin, with one layer of resin, and with two layers of resin. Therefore, waterproofing resin, as a low-cost material, provides a long-term protective solution for geotextiles made from cattail fibers.