Effects of recycled Polyethylene terephthalate fibers on strength behavior of cemented Babolsar sand

Abstract

Sandy soils constitute a large part of the soils of northern part of Iran. The construction of structures on these soils will have some problems due to lack of proper strength properties. On the other hand, in recent years, bottles of Polyethylene terephthalate (PET) plastic such as water and soda bottles have resulted an environmental threat due to their prolonged durability in the environment. Utilization of these materials for soil improvement seems to be a sustainable approach. In this research, the effect of recycled PET on mechanical properties of Babolsar sandy soil is investigated through an extensive experimental analysis carried out using direct shear and consolidated drained (CD) triaxial compression tests. Various concentrations of PET were mixed to sand with 3%, 5% and 7% cement content. The curing time and relative density of samples was 7 days and 70%, respectively. The results showed that addition of this fiber improves strength parameters such as cohesion and internal friction angle. Furthermore, the effect of the fiber is less marked with an increase in cement content in samples. The samples with 3% cement were showed better results in both direct shear and tiaxial tests. By adding 0.5% and 1% PET fibers to the samples containing 3% cement at 100 kPa pressure, the ratio of strength in direct shear tests was increased 13% and 24%, respectively, and in the triaxial test was increased 50% and 93%, respectively.

The Effect of Nanoclay on the Morphological and Physical Properties of Bitumen/PET/Clay Nanocomposites

“…Fibers and polymers are among the additives which can enhance the mechanical and thermal resistance of asphalt mixes [6][7][8]. Polymers are viscoelastic materials that can extend the service temperature of bitumen in various external conditions.…”

Evaluating the performance of human hair impregnated with cement slurry in remediation of the Caspian coastal silty sand

“…In recent decades and in developing countries, the modification and remediation of problematic soils using inexpensive and accessible materials has received a lot of attention for its economic benefits. The use of different natural fibers made of date, coconut, sisal, hemp, palm, flax, straw, bamboo and cane, and synthetic fibers made of glass, polyethylene, polyester and polypropylene in manufacturing of various geogrids, geocomposites, geotextiles, etc to arm various types of problematic cohesive and non-cohesive soils, have been studied so far by different researchers, such as [1][2][3][4][5], Hejazi et al (2012), [6], Malidarreh et al (2018) [7]. Natural human hair fibers is another additive that investigated by some other researchers to study the effects on mechanical soil properties.…”