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1

Reuse of "end of life tyres" tyre chips - sand mixture mechanical study

Dembicki E., Kowalczyk M., Gotteland P.

Archives of Civil Engineering

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2012

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Vol. 58, nr 3

379-406

EN

The use of shredded tyre in civil engineering applications is a significant potential end use market. The reuse of tyre chips may not only address growing environmental and economic concerns, but also help to solve geotechnical problems associated with low shear strength. The purpose of this paper is to investigate the properties of tyre chips and tyre chips – sand mixture, and to find the mixture with the highest shear strength. In this study, an experimental testing program was undertaken using a large – scale triaxial apparatus with the goal of evaluating the optimum percentage of tyre chips in sand. The effects on shear strength of varying percentage of tyre chips and varying confining pressure were studied. Tyre chips content was suspected to have influence on stress – strain and volumetric strain behaviour of the mixture. Some tests were conducted to check the influence of number of used membranes, of saturation and compaction, on sample properties.

2

In-place determination of topsoil shear properties for off-road vehicle traffic

Gotteland P., Plé O., Benoit O.

Studia Geotechnica et Mechanica

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2008

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Vol. 30, nr 1-2

269-275

EN

The study of the off-road vehicle traffic consists in estimating the drawbar pull of a vehicle on a given soil and can be calculated by means of such models as that of Janosi-Hanamoto which depends on the soil mechanic parameters, i.e., the angle of friction and cohesion. These parameters result generally from shearing tests. The annular shearing test is often used to estimate the soil shearing in mobility studies. Other shearing test is the translation shearing test which consists in the translation, at a constant speed, of a loaded plate with a smooth interface or with grousers. This article aims to present the validation of the translation shearing test for the study of the shearing of the granular surface soils and the method allowing us to link this operational test with the efforts measured during full-scale tests. An experimental device was developed to perform superficial translation shearing tests of a loaded plate at slow speed or fast speed to obtain the shearing forces.

3

Characteristics of tyre chips-sand mixtures from triaxial tests

Bałachowski L., Gotteland P.

Archives of Hydro-Engineering and Environmental Mechanics

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2007

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Vol. 54, nr 1

25-36

EN

Civil engineering and mainly geotechnics and pavement engineering are the possible domains of application for the end of life tyres. They are used in geotechnical applications as backfill or lightweight fill material in substitution or in combination with natural soils. The mechanical behaviour of tyre chip-sand mixtures was studied in a series of CD triaxial tests. The study was focused on random distribution of tyre chips within the mixture. Initial modulus of deformation, angle of internal friction and cohesion were evaluated for each series of test. A composite conserves a good shear resistance at large strains. The mode of failure depends on the tyre content. The internal shear mechanism and the reinforcement mechanism of the composite are discussed as a function of tyre content, chips orientation and stress level.

4

Strength characteristics of tyre chips-sand mixtures

Gotteland P., Lambert S., Bałachowski L.

Studia Geotechnica et Mechanica

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2005

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Vol. 27, nr 1-2

55-66

EN

Waste tyres are more and more widely used for geotechnical applications as backfill material that is either a substitute for natural soils or combined with them. Beyond the economical and environmental concern, these materials can help solving problems with low shear strength soils. This study aims at investigating a mechanical behaviour of tyre chip-sand mixtures thanks to a triaxial tests campaign. Two factors were studied: (i) the tyre chip content, from 0 to 100% by mass and (ii) the orientation of the pieces of tyre, with four varying orientation conditions. This paper focuses on the stress-strain behaviour of the different mixtures and their volumetric variation during the tests. The angle of friction and cohesion for each mixture are presented. The optimum percentage mass and optimum unit weight, which gives the maximum shear strength, are also determined. The influence of the different parameters is discussed.