Mechanical Parameters of Rubber-Sand Mixtures for Numerical Analysis of a Road Embankment

Kowalska, Magdalena; Chmielewski, M.

doi:10.1088/1757-899x/245/5/052003

Cited by 11 publications

(10 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First of all, irrespective of the soil type, after adding it to rubber waste, its unit weight goes down, making the structure lighter. Moreover, after adding shredded rubber to non-cohesive soils, a noticeable decline of the angle of internal friction value is observed by approximately 22%, according to CD triaxial tests [26] or even by approximately 30% according to tests in a direct shear apparatus [6]. It is accompanied by an increase in the apparent cohesion of the mixture, where so-called threshold values are observed (according to Bałachowski and Gotteland [33] this is approximately 50% of rubber waste content in the mixture, and according to Kowalska and Chmielewski [6] this is approximately 30%).…”

Section: Literature Reviewmentioning

confidence: 98%

“…Methods of various rubber types waste management (not only tires) are regulated by appropriate laws and regulations, which require tests to be performed on new applications, e.g., in civil engineering works (reported by the World Business Council for Sustainable Development (WBCSD) [3]). Primarily their use as backfills for road and railway embankments or as retaining wall backfills (e.g., [4][5][6][7][8][9]) or adding them to asphalt mixtures (e.g., [10,11]) or as buildings protection against earthquakes (e.g., [12]). It is true that the excess of waste, including rubber, results directly from human activities.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Strength Characteristics of Clay-Rubber Waste Mixtures in UU Triaxial Tests

Jastrzębska

2019

Geosciences

View full text Add to dashboard Cite

This paper presents results of undrained and unconsolidated (UU) triaxial tests related to the influence of tire waste addition on strength characteristics of red clay from Patoka in Southern Poland. Angle of internal friction and cohesion values were estimated for 30 specimens prepared from pure red clay (RC), its mixtures with two different fractions of shredded rubber in 5%, 10%, and 25% mass proportions as well as for pure powder (P) and granulate (G). It has been observed that the addition of granulate contributes more to the increase in the angle of friction than the addition of powder (uu = +1% (G-5) / +16% (G-10) / +31% (G-25), uu = +1% (P-5) / +10% (P-10) / +19% (P-25)). On the other hand, rubber additions reduce cohesion in mixtures, and the effect is enhanced with increases in their grain size and percentage composition (cuu = −31% (G-5) / −63% (G-10) / −87% (G-25), cuu = −67% (P-5) / −58% (P-10) / −58% (P-25)). It has been noticed that a change of parameters uu and cuu causes a decline of shear stresses at increasing granulate content. There is an inverse relationship for powder. At the same time, it has been shown that the failure strain, hence a change in red clay-rubber (RCR) mixtures plasticity, is related to the level of confining stress 3 and the type of rubber waste. Results of tests and their comparison with results of other researchers show that each time it is necessary to experimentally verify a given soil with specific rubber waste.

show abstract

Section: Literature Reviewmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Strength Characteristics of Clay-Rubber Waste Mixtures in UU Triaxial Tests

Jastrzębska

2019

Geosciences

View full text Add to dashboard Cite

show abstract

“…ASTM D6270 [26] gives the standard practice for using scrap tyres in construction applications. The effective utilization of scrap rubber tyre in various forms has been reported by several researchers [27][28][29][30][31], suggesting an optimum rubber content of 10-20% for improving the frictional characteristics of granular mixtures. In the present study, the proven role of rubber in improving shear characteristics of sand and aggregates is utilized in assessing the prospect of using rubber tyre crumbs as a sustainable alternative for geocell infill material.…”

Section: Introductionmentioning

confidence: 99%

Model Tests on Coir Geotextile-Encased Stone Columns with Tyre Crumb-Infilled Basal Coir Geocell

Menon

Konnur

Bhasi

2021

Int. J. of Geosynth. and Ground Eng.

View full text Add to dashboard Cite

An encased stone column with a geocell mattress can serve as a flexible pile raft system, helping in the uniform transfer of embankment load to the underlying foundation soil, improving their behavior. The efficiency of encasement and geocell depends on various factors, among which the material stiffness is an important one. The present study addresses the global concerns over excessive use of synthetic materials in soil by replacing the conventional synthetic forms of reinforcement (geotextile/geocell) with locally available coir fibers. Furthermore, to enhance the composite system's sustainability, the potential replacement of the conventional geocell infill materials like stone and aggregates by waste rubber tyre crumbs is also investigated. Laboratory scale model tests were conducted on a single encased stone column installed in a soft clay bed with coir geocell mattresses as basal reinforcement, adopting the unit cell concept. The static vertical load was applied at a constant strain rate of 0.06 mm/min to simulate the field conditions, and the load settlement responses were recorded up to a settlement of 12 mm. The results show that the composite system significantly improved the load settlement response of soft soils by developing more uniform load settlement profiles. It was also observed that the partial replacement of crumb rubber up to 10% as geocell infill material improved the interface frictional behavior and the load-carrying capacity of the foundation, thereby forming a sustainable solution for the environmental hazard due to the accumulation of used rubber tyres.

show abstract

“…However, the user-friendly design methods to be used for tyrebaled structure evaluation are still waiting for elaboration. Up to date, the finite element method (FEM) was commonly used to model and evaluate the structural behaviour of geotechnical objects comprising TDA in various applications (Bosscher et al 1997;Lopera Perez et al 2016;Meles et al 2016b;Kowalska and Chmielewski 2017;Mahgoub and El Naggar 2020). The comprehensive material testing of TDA was commonly required to determine the properties to be assumed in FE analysis.…”

Section: Introductionmentioning

confidence: 99%

Stability and Settlement Analysis of a Lightweight Embankment Filled with Waste Tyre Bales over Soft Ground

Duda

Siwowski

2021

Transp. Infrastruct. Geotech.

View full text Add to dashboard Cite

The waste tyre-derived products, including whole tyres, tyre bales, shreds, chips, and crumb rubber, have begun to be used in various geotechnical applications. In particular, the use of tyre bales in the construction of a lightweight embankment on the soft ground has the potential to satisfy the demand for low-cost materials exhibiting such beneficial properties. This paper presents the comparison between the common medium sand-filled embankment and two tyre-baled structures with various granular interlayers: medium sand and rubber aggregate. To assess the efficiency of tyre bale application in soft ground conditions, two subsoils were considered in the study: sandy clay and silty clay. The stability and settlement analysis of embankments, as well as subsoil bearing capacity checking, were performed for all structural cases. Bishop’s limit equilibrium slicing method and the finite element method were used in the embankment and subsoil analysis. The comprehensive testing of tyre bales and filling materials was also carried out to obtain the set of parameters used in both analyses. The comparison allowed qualitatively assessing the effectiveness of using waste tyre bales as a filling of road embankment when founded on soft ground. The analysis revealed that the application of tyre bales generally enhanced the embankment stability, effectively reduced the embankment settlement, and reduced the normal stress in the subsoil. In the tyre-baled embankments, the slip surface is located mostly within the embankment slope, showing good rotational stability, independent of subsoil conditions.

show abstract

Mechanical Parameters of Rubber-Sand Mixtures for Numerical Analysis of a Road Embankment

Cited by 11 publications

References 9 publications

Strength Characteristics of Clay-Rubber Waste Mixtures in UU Triaxial Tests

Strength Characteristics of Clay-Rubber Waste Mixtures in UU Triaxial Tests

Model Tests on Coir Geotextile-Encased Stone Columns with Tyre Crumb-Infilled Basal Coir Geocell

Stability and Settlement Analysis of a Lightweight Embankment Filled with Waste Tyre Bales over Soft Ground

Contact Info

Product

Resources

About