Effect of Polypropylene Fibers on Physical and Strength Properties of Local Clayey Soil


14th International Congress on Advances in Civil Engineering-ACE 2020-2021, İstanbul, Türkiye, İstanbul, Turkey, 6 - 08 September 2021

  • Publication Type: Conference Paper / Full Text
  • City: İstanbul
  • Country: Turkey
  • Bursa Uludag University Affiliated: Yes


Geotechnical engineers face various problems while designing the foundations on highly compressible clayey soil due to poor bearing capacity and excessive settlement. In order to overcome some of these difficulties, many researchers have concentrated their studies on soil improvement techniques. Recently, soil reinforcement has considered an effective and reliable technique for improving the strength and stability of soils. This paper presents an experimental study evaluating the effect of randomly distributed polypropylene fibers on Maximum dry density (MDD), Optimum moisture content (OMC), and Atterberg Limits (liquid limit, plastic limit, and shrinkage limit) with different polypropylene fiber contents 0%, 0.5%, 1%, and 1.5% (by dry weight of the soil). In addition, the effect of Polypropylene fiber on the strength properties (Unconfined Compressive Strength (qu), Elasticity modulus (Eu)) is investigated. At the outset, initial characteristics and properties for the studied soil were determined and then compared with that of samples reinforced with polypropylene fibers for the studied fiber contents (fibrillated polypropylene fiber). These experiments show that Maximum dry density and liquid limit decrease but plastic limit and shrinkage limit increase with increasing reinforcement ratios (fiber content), and these changes don't lead to a change in the soil classification for the studied fiber inclusion with a possibility to be changed for fiber content is greater than 1.5%. With reference to the unconfined compressive strength test results, it was observed that the undrained elastic modulus decreased for fiber content greater than 0.5% and the unconfined compressive strength (qu) has been increased for all studied reinforcement ratios (fiber content). It can be concluded that there is a good potential for use of polypropylene fiber to reinforce high plasticity clayey soils and considering that 0.5% and 1% fiber content is suitable for the soil in this study to have a good improvement for unconfined compressive strength properties.