Creep Behavior of Recycled Plastic Lumber in Slope Stabilization Applications

Chen, Cheng-Wei; Salim, Hani; Bowders, John J.; Loehr, J. Erik; Owen, Jacob

doi:10.1061/(asce)0899-1561(2007)19:2(130)

Cited by 44 publications

(17 citation statements)

References 2 publications

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“…The results of the accelerated creep tests conducted on virgin HDPE indicate that (1) both Time Temperature Superposition (TTS) and Stepped Isothermal Method (SIM) are appropriate methods for accelerating creep in compression of HDPE; (2) in TTS the constants, c 1 , c 2 , and the reported shift factor a T (Table 1) appear to be the same in tension and compression, at least below 5.6 MPa (800 psi); and (3) preliminary results indicate that the tested HDPE loaded in compression will creep by approximately 2% in 100 years when loaded at an ultimate stress of 2.8 MPa (400 psi). …”

Section: Discussionmentioning

confidence: 99%

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Comparison of Accelerated Compressive Creep Behavior of Virgin HDPE Using Thermal and Energy Approaches

Bozorg-Haddad¹,

Iskander

2010

J. of Materi Eng and Perform

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This article compares two available approaches for accelerating the creep response of viscoelastic materials, such as High Density Polyethylene (HDPE), which is increasingly gaining attention for use in construction. Thermal acceleration methods to predict the tensile creep of polymers are already available. The TimeTemperature Superposition (TTS) phenomenon is the basis of several available methods, and an ASTM standard for tensile creep of geosynthetics is based on one of its derivatives, the Stepped Isothermal Method (SIM). In this article, both TTS and SIM have been adapted to study the compressive creep of virgin HDPE.An alternate approach, based on the equivalence of strain energy density (SED) between conventional constant-stress creep tests and strain-controlled stress-strain tests, is also adapted for accelerated compressive creep of HDPE. There is remarkably a good agreement among the creep behaviors obtained from conventional tests, TTS, SIM, and SED predictions for virgin HDPE.

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Section: Discussionmentioning

confidence: 99%

“…Creep is an important design consideration for civil engineering structures, especially when a viscoelastic element like HDPE is involved ( Ref 1,2,3,4,5). Creep refers to a timedependent deformation at stress less than the strength of the material.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Accelerated Compressive Creep Behavior of Virgin HDPE Using Thermal and Energy Approaches

Bozorg-Haddad¹,

Iskander

2010

J. of Materi Eng and Perform

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“…RPP is composed of High Density Polyethylene, HDPE (55% -70%), Low Density Polyethylene, LDPE (5% -10%), Polystyrene, PS (2% -10%), Polypropylene, PP (2% -7%), Polyethylene-terepththalate, PET (1%-5%), and varying amounts of additives i.e. sawdust, fly ash (0%-5%) (Chen et al, 2007;McLaren, M. G., 1995;Lampo and Nosker, 1997). One of the major shortcomings of RPP for structural use is low modulus of elasticity; however, the use of glass and wood fiber additives significantly improves the modulus of elasticity for plastic lumber (Breslin et al, 1998, Lampo andNosker, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…RPPs are predominantly a polymeric material, fabricated from recycled plastics and other waste materials (Chen et al, 2007;Bowders et al, 2003). RPP is composed of High Density Polyethylene, HDPE (55% -70%), Low Density Polyethylene, LDPE (5% -10%), Polystyrene, PS (2% -10%), Polypropylene, PP (2% -7%), Polyethylene-terepththalate, PET (1%-5%), and varying amounts of additives i.e.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Slope Stabilization Using Recycled Plastic Pin

Khan

Hossain

Lozano

2014

Geo-Congress 2014 Technical Papers

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Moderate (3H : 1V) to steep (2.5H : 1V) slopes and embankments underlain by expansive clayey soils are susceptible to shallow land sliding during intense and prolonged rainfall events. These failures are predominant in North Texas area and cause significant maintenance problems for the Texas Department of Transportation (TxDOT). The Recycled Plastic Pin (RPP) has potential to be utilized in slope stabilization as a remedial measure of shallow slope failure. A parametric study was conducted to evaluate the effect of different spacings of RPP on the factor of safety and deformation of the slope. The objective of the current study was to investigate the effect of spacing and length of RPP over the factor of safety using Finite Element method (FEM). The analysis was conducted using 2D FEM software package PLAXIS 2D and factor of safety of the slope was determined using the strength reduction technique. A highway slope constructed using high plastic clayey soil, located over US 287 near St. Paul overpass in Midlothian, Texas was selected as reference slope. The strength of the slope was back analyzed using PLAXIS 2D at factor of safety equals to unity. As a remediation technique, RPP was selected for the slope stabilization and the slope was analyzed with different lengths (2.44 m to 3.65 m, 8 ft to 12 ft) and spacings (0.61 m c/c to 2.44 m c/c, 3 ft c/c to 8 ft c/c) of RPP. The FEM results indicated that RPP provided resistance against the shallow failure and resulted increment in factor of safety by shifting the failure plane to a deeper depth toward deep seated failure. In addition, the factor of safety increased with the increment in RPP length as higher resistance was observed from the foundation soil. The factor of safety of the reinforced slope remained almost constant up to RPP spacing of 1.5 m (5 ft) c/c and then decreased with further increment in spacing. The horizontal deformation of the slope was greater with the increment in spacing of RPP.

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“…Typically, RPPs are fabricated from recycled plastics and waste materials (polymers, sawdust, and fly ash) (Chen et al 2007). It is a lightweight material and less susceptible to chemical and biological degradation than other reinforcement materials.…”

Section: Introductionmentioning

confidence: 99%

Performance of Recycled Plastic Pin (RPP) for Slope Stabilization

Khan

Hossain

Khan

et al. 2017

Soil Testing, Soil Stability and Ground Improvement

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Abstract. Surficial failures of highway slopes in clayey soils are quite common throughout the United States. These failures commonly occur for the slope constructed with expansive clay, especially after prolonged rainfall. These failures are also predominant in North Texas area and cause significant maintenance problems for the Texas Department of Transportation (TxDOT). As an alternative to the conventional slope stabilization technique, a green and cost effective slope stabilization method using the Recycled Plastic Pin (RPP) had been utilized and tested for its performance. RPPs are driven into the slope face to provide additional resistance along the slip surface, which increases the factor of safety against shallow slope failure. Current study summarizes the long term performance of a highway slope on expansive clay reinforced with RPP. The slope is located over US 287 near the St. Paul overpass in Midlothian, Texas. Surficial movement had taken place over the slope, resulting in cracks over the shoulder and near the bridge abutment. Three 50 ft. slope sections were stabilized using RPPs in March 2011. In addition, two 50 ft. unreinforced control sections were utilized between the reinforced sections to evaluate the performance of slope sections stabilized with RPP. After installation of the RPPs, the performance of the slope was monitored by using instrumented RPPs, inclinometers and topographic survey. The performance monitoring results indicate that, maximum deformation of the reinforced slope section is less than 3.75 cm (1.5 in.). However, more than 38 cm (15 in.) of vertical settlement was observed at the control sections during the last 5 years monitoring period. Also, few slope-sections just opposite side of reinforced slope at the same highway failed during the monitoring period. Based on the last 5 years monitoring data, it was summarized that RPP can be successfully utilized for slope stabilization.

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Creep Behavior of Recycled Plastic Lumber in Slope Stabilization Applications

Cited by 44 publications

References 2 publications

Comparison of Accelerated Compressive Creep Behavior of Virgin HDPE Using Thermal and Energy Approaches

Comparison of Accelerated Compressive Creep Behavior of Virgin HDPE Using Thermal and Energy Approaches

Numerical Study of Slope Stabilization Using Recycled Plastic Pin

Performance of Recycled Plastic Pin (RPP) for Slope Stabilization

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