Utilization of Depolymerized Recycled Polyethylene Terephthalate in Improving Poorly Graded Soil

This study introduced recycled plastic waste as a soil stabilizer and encouraged using it as an alternative material in the improvement of poorly graded soil. The water bottles’ plastic waste was depolymerized and recycled to produce a powder material then used this material as a soil stabilizer. Di...

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Bibliographic Details
Published in:Transportation infrastructure geotechnology 2020-06, Vol.7 (2), p.206-223
Main Authors: Al-Taie, Abbas J., Al-Obaidi, Anwar, Alzuhairi, Mohammed
Format: Article
Language:English
Subjects:
Building Materials
Compaction
Compression
Compression tests
Depolymerization
Dry weight
Electron microscopy
Engineering
Flooding
Foundations
Friction reduction
Geoengineering
Geotechnical Engineering & Applied Earth Sciences
Hydraulics
Internal friction
Laboratory tests
Plastic debris
Polyethylene
Polyethylene terephthalate
Recycled materials
Sandy soils
Scanning electron microscopy
Soil
Soil compaction
Soil resistance
Soil stabilization
Soil treatment
Soil water
Technical Paper
Time compression
Time lag
Void ratio
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Summary:This study introduced recycled plastic waste as a soil stabilizer and encouraged using it as an alternative material in the improvement of poorly graded soil. The water bottles’ plastic waste was depolymerized and recycled to produce a powder material then used this material as a soil stabilizer. Different percentages (0.0, 0.5, 1.0, 1.5, 2.0%) of the depolymerized recycled polyethylene terephthalate (DRPET) (by dry weight of soil) have been chosen to evaluate its effects on the properties and behavior of poorly graded sandy soil. These effects studied through a series of laboratory tests including scanning electron microscopy. Also, the applicability of DRPET in inundation conditions has been studied using confined compression tests. It was found that untreated and treated poorly graded soil show the same shape of compaction curves, and DRPET filled the pore spaces and affected the compaction characteristics of the soil. The soil treated with 1.5 and 2.0% DRPET exhibited brittle behavior, and the addition of DRPET increased the angle of internal friction and reduced the maximum vertical contractive displacement of the soil. DRPET coated the surface of particles and increased the resistance between soil particles and, therefore, increased the time lag during compression. Finally, under confined compression, poorly graded soil treated with DRPET exhibited small changes in void ratio and slightly influenced by inundation in water.
ISSN:2196-7202
2196-7210
DOI:10.1007/s40515-019-00099-2