Waste Tire Chips Research Articles

Mechanical properties of tire chip and cement stabilised red clay

ABSTRACT Reutilisation of waste tire chips to improve red clay is of great significance to environmental protection. The mechanical properties of tire chip and cement stabilised red clay (TCCSRC) at different proportions were investigated through compaction, compression, unconfined compression strength (UCS), and direct shear tests. The UCS and shear strength of TCCSRCs with different proportions were tested and analysed at their optimal moisture content (OMC). The results indicated that the porosity ratio, UCS, shear strength, and cohesion of TCCSRC decreased with increasing tire chip content. The addition of cement increased the sample UCS and shear strength. When the content of tire crumb is 20% and the cement content is 5%, the specimens show good performance in all basic properties, including UCS can reach 1034.3 kPa; the shear strength can reach 46.7 kPa when the axial pressure is 150 kPa.

Use of Waste Tire Chips and PET Plastic Flakes in Backfill Behind Retaining Walls

Abstract The use of waste in the field of civil engineering is one of the solutions to reduce the harmful impact of waste on the environment on the one hand and preserve natural resources on the other. This study aims to investigate the effect of using waste materials such as plastic and tire chips that can be used as backfill in retaining walls. A numerical study has been carried out by using PLAXIS 2D software version 8.6 to model three types of rigid retaining walls, namely: scale wall test, cantilever wall, and gravity wall. In addition, the backfills of those retaining walls are composed of two mixtures. The first is a mixture of sand and tire chips (TC) with different percentages (10%, 30%, 50%, and 70%). The second is a mixture of sand and PET plastic flakes at different percentages (12.5%, 22.5%, and 32.5%). The results obtained from this study confirmed that the use of PET plastic waste and tire chips waste mixed with sand in the backfills of rigid retaining walls contributes effectively to the reduction of horizontal and vertical displacements as well as the earth pressures behind the retaining walls, therefore improving the stability of the retaining walls.

Efficient utilization of tire chip reinforced sand under footings subjected to purely inclined loads-an experimental and life cycle investigation.

The proper disposal of large stockpiles of tire wastes has become a major challenge today. Through this study, an attempt was made to effectively utilize the large chunk of tire wastes as a reinforcement for improving the bearing capacity of shallow foundations subjected to purely inclined loads. The study was accomplished in two phases. In the first phase, the tests were conducted on reinforced beds by varying the quantity of tire chips, the thickness of the reinforced zone, the inclination of loading, and the equivalent relative density of the reinforced zone. The bearing capacity ratio (BCR) was used as a factor to quantify the gains. It was observed that the optimum quantity and thickness of the reinforced zone were 20% by weight and 1B, respectively, where B is the width of the footing. Improvements were found significant at both loose and dense equivalent relative densities. The BCR values under inclined loads were higher than in central vertical loading conditions indicating that the technique is more useful in the latter. The study also compares the environmental impacts generated from tire chip and geogrid foundations in terms of various midpoint and endpoint impact categories using cradle-to-gate LCA. Midpoint environmental impacts have been shown in climate change, freshwater ecotoxicity, fossil depletion, ozone depletion, and water depletion, and endpoint impacts are represented in terms of damage to ecosystem quality, damage to human health, and damage to resources. The study found that foundation prepared with waste tire chips is less polluting to the environment compared to geogrid foundation. In addition to this, landfill of waste tires will be reduced by this technology which will further help in the reduction of the total environmental impact of the system. Henceforth, by adopting the current technology into construction practices, the large stockpiles of discarded tires can be disposed of in a sustainable way.

Experimental evaluation of the impacts of diesel-nanoparticles-waste tire pyrolysis oil ternary blends on the combustion, performance, and emission characteristics of a diesel engine

In the present research, pyrolytic oil is obtained from the waste tire chips, and then acid washing process, clay and calcium oxide process, distillation process, and oxidative sulfur removal processes are used to improve its properties. Then it is blended into conventional diesel fuel with/without Al2O3 nanoparticles, and the performance, combustion, and emission characteristics of a single-cylinder, air cooled, and naturally aspired diesel engine are discussed in this study. Tests were performed at varying engine loads from 3 to 12 Nm with the gaps of 3 Nm under a constant engine speed of 2400 rpm. In this study, three types of fuels were tested, namely D100 (100% diesel fuel), P10 (90% diesel fuel and 10% pyrolytic oil), and P10 + 1 g Al2O3 (obtained by adding 1 g of Al2O3 nanoparticles to P10 fuel). The addition of Al2O3 nanoparticles increased the brake thermal efficiency while reducing the maximum in-cylinder pressure, heat release rate, specific fuel consumption, exhaust gas temperature, hydrocarbon emissions, NOx emissions, and CO emissions compared to other test fuels. Namely, with the addition of Al2O3 nanoparticles, BTE was improved by 4.51% and 1.59% compared to P10 and pure diesel fuel, respectively. According to this, the BSFC value increased by 4.29% for P10 test fuel and then is reduced by 2% for P10 + 1 g Al2O3 test fuel as compared with conventional diesel fuel. Compared to diesel fuel, the CO, NOx, and HC emission values deteriorated by 17.5%, 5.69%, and 18.6%, respectively, with the addition of pyrolysis oil, and these deteriorated properties were improved by 10%, 6.82%, and 13.95%, respectively, with the addition of Al2O3 nanoparticles. In the light of this study, it was observed that while waste tire pyrolysis oil worsened engine performance, emission, and combustion characteristics, these deteriorations could be improved with nano Al2O3 supplementation.

An experimental assessment on dual fuel engine behavior powered by waste tire-derived pyrolysis oil – biogas blends

This paper is intended to investigate the usability of waste tire pyrolysis oil along with diesel and biogas dual fuel in the CI engines. In this framework, the waste tire chips are firstly pyrolyzed in the study, and then are volumetrically blended into the conventional diesel fuel (DF) at the ratio of 20%. The biogas flow rate changes as 0.5, 1, and 2 L/min when the engine is fuelled by P20 test fuel. Throughout the experiments, the engine runs at a fixed engine speed of 1500 rpm under 2.5, 5, 7.5 and 10 Nm. In the results, it is noticed that the unburnt emissions such as CO and HC considerably increases with the presence of pyrolysis oil and biogas in the cylinder due to the lack of oxygen and lower heating value of these fuels. However, the NOx firstly rises with the diesel-pyrolysis oil blends by 2.21% but then pulls back with the introduction of biogas to the combustion chamber. It drops by 2.29%, 4.93%, and 11.14% for P20 + 0.5 BG, P20 + 1 BG, and P20 + 2 BG test fuels, respectively in comparison to that of DF. On the other hand, the engine performance worsens with the pyrolysis oil due to the lower energy content. Accordingly, the increment on BSFC is found to be 9.28%, 25.15%, 42.51%, and 67.68%, and the reduction on BTE is found to be 8.47%, 17.72%, 25.52%, and 33.48% for P20, P20 + 0.5 BG, P20 + 1 BG, and P20 + 2 BG test fuels, respectively. It is concluded that even if they worsen the engine performance and exhaust emissions, the burning of waste products in the forms of pyrolysis oil and biogas as fuel substitutions in CI engines seems a very promising way in terms of waste management, disposal the huge volume of waste products from the nature, and protection of rapidly depletion fossil fuel reserves.

Comprehensive feasibility study for application of waste tire chips in enhancing the performance of shallow foundations.

This study aims to assess the viability of waste tire chips as sand reinforcement for enhancing the performance of shallow foundations. Detailed experimental investigation is carried out to analyze the behavior of model footing placed on sand reinforced with waste tire chips, and the observed improvement is quantified in terms of a non-dimensional factor, bearing capacity ratio (BCR). The influence of variation of several factors such as the content of tire-chip reinforcement, the extent of tire reinforced sand zone, footing shape, the effect of submergence, and scale effects on BCR has also been studied. Test results indicate significant improvement in BCR validating the effectiveness of tire chips in improving the bearing capacity of sand. The optimum tire content, depth of reinforced zone, and width of the reinforced zone are recommended as 30%, 1B-2B, and 3B-5B, respectively (B is the width of the footing), where BCR increased to more than 5 under both low strain and high strain conditions. It was also established that submergence of the reinforced soil and shape and size of footing did not have a significant influence on the BCR. Moreover, the performance of tire chip-reinforced sand is found to be better than both fiber- and geogrid-reinforced sand. Bearing capacity increase of up to 1.89 times and 2.40 times was observed in tire chip-reinforced sand in comparison to fiber- and geogrid-reinforced sand, respectively. On the whole, the significant improvement in BCR and the better performance of tire chips over other alternatives ascertain that bulk utilization of tire wastes in shallow foundations has immense potential for effective waste management of large stockpiles of tires and can prove to be an economical and sustainable solution for the construction industry.

Mechanical and Dynamic Behavior of an Elastic Rubber Layer with Recycled Styrene-Butadiene Rubber Granules.

This study evaluates the tensile properties, including the tensile strength and elongation at break, and dynamic behavior, including shock absorption and vertical deformation, of an elastic rubber layer in synthetic sports surfaces produced using waste tire chips containing styrene-butadiene rubber (SBR). The primary variables of the investigation were the number of compactions, resin–rubber granule ratio, and curing conditions, such as aging, the temperature, and the relative humidity. The test results showed an increase in the tensile strength of the elastic rubber layer with recycled SBR as the number of compactions, resin–rubber granule ratio, curing period, and temperature increased, while the elongation at break was affected by the curing temperature and period. Shock absorption and vertical deformation decreased with an increasing resin–rubber granule ratio and number of compactions due to the increased hardness. However, these properties were not significantly affected by the curing conditions. Furthermore, the test results indicated that the curing temperature has a pronounced effect on the tensile properties of the elastic rubber layer, and maintaining the appropriate curing temperature—approximately 50 °C—is a possible solution for improving the relatively low tensile properties of the elastic rubber layer.

Experimental Investigations on Effect of Geocell, Waste Tire Chips, and Geocell–Tire Chips on Foundation Reinforcement

AbstractModel tests were conducted for sand foundations reinforced by geocells, waste tire chips, and geocell–tire chips. Three factors related to the foundation performance are mainly examined in ...

Sustainable utilization of waste tire-chips reinforced copper tailings as structural fill

One of the major wastes from mining and automobile sectors is tailings and waste tires, respectively. Their voluminous nature calls for urgent action for safe disposal and to reduce the growing threat on the environment. Under the present study, laboratory model footing and toxicity characteristics leaching procedure (TCLP) tests were conducted on tire chip-reinforced copper tailings (TRCT) to explore the feasibility of its use as structural fill and its potential impact on surroundings. Parameters considered for the laboratory study were tire chip quantity, relative density of copper tailings and depth of reinforced zone. The test results indicate that there is a significant enhancement in bearing capacity of copper tailing at all the studied strains by the addition of waste tires. Bearing capacity increased by more than nine times compared to unreinforced tailings when reinforced with 30% tire chips by weight. The TCLP tests conducted on copper tailings established that concentrations of the leached elements were well below the regulatory standards. Furthermore, a neural network model was trained via the experimental results of the tests to quickly predict the bearing capacity of TRCT for quick use in field applications. Therefore, the proposed technique can help in the effective waste management and safe disposals of large quantities of copper tailings as well as waste tires and also promoting sustainability in construction.

Use of waste tire-chips in shallow footings subjected to eccentric loading-an experimental study

Growing generation of waste tires represents a serious danger to the environment and human well-being. This paper focusses on applications of tire wastes in shallow footings subjected to eccentric loading. Presence of eccentric loads significantly reduces the load carrying capacity of the soil. Therefore, laboratory model tests were conducted on tire chip reinforced sand subjected to eccentric loading conditions. Parameters considered for the study were waste tire chip content, reinforcement depth and relative density while eccentricity of the loading was varied as 0.1B and 0.2B, where B is the width of the footing. A substantial increase in bearing capacity was observed at all strains. Based on the experimental results, the optimum quantity of tire waste and the depth of reinforcement recommended is 30% (by weight) and 1B respectively. The improvements were more significant at higher eccentricities with bearing capacity ratio obtained as high as 5.77 and 7.46 at low and high strains respectively. Moreover, the beneficial effects of the proposed technique were visible at both the dense as well as loose states.

Sustainable application of waste tire chips and geogrid for improving load carrying capacity of granular soils

The objective of the present study is to explore the viability of using waste tire chips and combined waste tire chips, geogrid reinforcement for improving load-carrying capacity of sand. Under this study, series of laboratory model footing tests were conducted to study pressure settlement behaviour of Tire chip Reinforced Sand (TRS). In first phase, tests were conducted on TRS underlying poorly graded sand by varying parameters such as tire chip content, reinforcement depth of TRS Zone, relative density of TRS. In the second phase, tests were conducted on Geogrid Reinforced Sand (GRS) and results were compared with TRS, and subsequently in third phase, combined behaviour of TRS and GRS was studied. Results indicated that addition of tire chips significantly increases bearing capacity at low strains (s/B = 2–5%) as well as at high strains (s/B = 10–20%). Bearing Capacity Ratio (BCR) as high as 4.65 and 10.36 was observed at low and high strains respectively. Performance of TRS was found better than GRS at all strain levels. The BCR can be further increased to 11 if TRS is used in conjunction with GRS. Therefore, recommended technique has an advantage of enabling shallow foundations in situations that either demand use of deep foundations or costly ground improvement techniques thus providing economy in construction as well as safe disposals of large stockpiles of waste tires.

Pressure settlement behaviour of strip footing resting on tire-chip reinforced sand

Under this study, model footing tests were conducted on sand reinforced with waste tire chips. Effect of Tire-chip content, depth of reinforcement and relative density of Tire-chip Reinforced Sand (TRS) was studied. There is significant improvement in pressure settlement behaviour of TRS at low strains as well as at high strains. It was found that optimum tire-chip content is 20% by weight at low strains (2–5% settlement ratios) and 40% by weight at high strains (10–20% settlement ratios). Pressure settlement behaviour of TRS was found better than geogrid-reinforced sand up to 10% settlement ratio. Therefore, use of waste tyres as reinforcement is beneficial from both economic and environmental perspective.

MECHANICAL CHARACTERIZATION OF RECYCLED TIRES IN CONCRETE

Waste tires have been an increasing problem every year due to the increase of vehicle sales. The disposal of waste tires has presented very serious problems to the human community in the world. Currently, some research has been studied on not only waste tire chips (WTC) but also recycled steel tire fibres (RSF) in concrete. Recent study is focusing on the usage of WTC and RSF in concrete mixture. The different weight of WTC and RSF is mixed in concrete in order to investigate the effect on mechanical properties. By adding WTC and RSF obtained a satisfactory improvement on cracking control, compressive strength, flexural strength and also tensile strength, Moreover, compressive, flexural and tensile strength was positively affected by the addition of WTC and RSF for some mixtures. More percentage of weight fractions added gives high result in tensile strength. However, the workability of the concrete reinforced with both WTC and RSF was negatively affected.

Engineering behavior of Tire Chips-Sand Mixture

Waste materials in the form of waste tires, rubbers etc, are produced in worldwide posing serious environmental problems. The reuse of tire chips may solve growing environmental problems in cost effective manner. It may help to solve geotechnical problems associated with low shear strength of soils, backfill materials against retaining walls and improving the stability of slopes etc. The objective of this research work is focused to investigate the feasibility of using waste tire chips as a means to enhance the shear strength of soil. To assess the behavior of the admixtures direct shear test and triaxial test were carried out by varying tire chips content. Various tire chips-sand mixtures by weight were taken. Under five normal stresses, the internal friction angle and the effects of different parameters were analyzed. The results revealed that shear strength parameters such as internal friction angle, normal stress and unit weight were improved significantly. Elastic Modulus are determined for sand-tire chips mixture and outcome indicates that it is a very effective energy absorbent material.

Evaluation of the rheological behavior of fresh self-compacting rubberized concrete by using the Herschel–Bulkley and modified Bingham models

The study herein presents the use of the Herschel–Bulkley and modified Bingham models to monitor the rheological behavior related to workability of the fresh self-compacting concrete containing waste rubber. Therefore, the self-compacting rubberized concretes were produced at a constant water-to-binder ratio of 0.35 and binder content of 520kg/m3. Class F fly ash was incorporated as 30% of total binder content by weight. Two types of waste scrap tire rubber, crumb rubber and tire chips, were utilized instead of natural fine and coarse aggregate at various level, respectively. The tire chips and three different graded crumb rubbers (No.18, No.5, and mixed crumb rubber) and five designated rubber contents of 5%, 10%, 15%, 20%, and 25% were considered as experimental parameters. The rheological behavior related to workability of the fresh concretes was investigated by using the ICAR rheometer. The torque–speed relationship obtained from rheometer was used to characterize the rheological behavior of fresh self-compacting rubberized concrete by applying the Herschel–Bulkley and modified Bingham models to experimental data. The results revealed that the self-compacting concretes produced in this study exhibited shear thickening behavior and increasing the rubber content resulted in higher exponent ‘n’ values for the Herschel–Bulkley and c/μ coefficients for the modified Bingham models.

Removal of Trimethylamine in a Biofilter Packed with Waste Tire Chips

Abstract Trimethylamine (TMA) is a product of decomposition of living things and it has a strong odor. A biofilter (BF) packed with waste tire chip for reuse as a new media, and inoculated with activated sludge was tested for TMA removal. Gas-phase 0.024–0.036 g TMA m−3 was removed by up to 95% with empty bed residence time (EBRT) of 30 and 20 s, but the removal efficiency (RE) reduced to 80% at an EBRT of 15 s. For concentrations varying between 0.012 and 0.024 g TMA m−3 at an EBRT of 20 s, 95% of TMA was removed, which then decreased to as low as 80% for concentrations varying between 0.049 and 0.056 g m−3. As a result, the RE of TMA in the BF was found to be a strong function of both concentration and EBRT. The critical elimination capacity (EC) point of TMA was inlet loading rate (ILR) of 5 g m−3 h−1 and the maximum EC was determined to be 14 g m−3 h−1 at an ILR of 23 g m−3 h−1. It was concluded that tire chips can be effectively used as a biofilm support material in BFs where the REs for TMA can be m...

Influence of Waste Tire Chips on Strength Characteristics of Soils

An experimental study was conducted to investigate the effect of waste tire chips on the strength characteristics of two soils. A cohesive clayey silt soil and a cohesionless fine sand soil were used. A program of standard Proctor tests, unconfined compression tests and California bearing ratio tests was carried out on specimens of the cohesive soil-tire mixtures, by varying tire chips content from 5% to 20% by weight of the soil. Vibratory compaction tests and direct shear tests were conducted on the cohesionless soil-tire mixtures by adding tire chips varying from 10% to 50% by weight. The results showed that 13% and 30% chip contents, respectively by weight, were optimum for composite strength of the two reinforced soil mixtures.

Effects of Design Mix and Porosity of Waste-Derived Paste as Landfill Daily Covers on Lead Retardation

An innovative waste-derived paste of waste tire chips and paper sludge was proposed for daily cover applications in municipal solid waste landfills. In this study, retardation and transport behaviors of lead (Pb) by the proposed paste were investigated using column tests. Breakthrough curves of 16 specimens at various design mixes and porosities were presented. A one-dimensional equilibrium deterministic transport model was used to fit the transport parameters from the breakthrough curves and to verify the homogeneity of the specimens. Analysis of the effluent concentrations from the column tests displayed a retardation effect for Pb in all cases, with fitted retardation factors ranging from 19.9 to 59.0. Lead retardation by the proposed paste was found to be sensitive to the paste’s porosity and design mix. Early arrivals of solute were observed unexpectedly in columns with high paper sludge content under high packing densities and were attributed to the possible presence of preferential flow paths. The ...

직교배열표를 이용한 고강도콘크리트 내화성능 보강재의 배합 최적화 연구

The peculiarity pointed out for high strength concrete is the occurrence of spalling during a fire. Recently, there are many efforts such as development of all types of spalling reducing materials and other innovative materials in various fields. Need is now to examine the adequate mixing proportions of these materials. This study intended to derive experimentally and statistically mix proportions that can represent the basic quality requirements as well as the optimal effects on the fire-resistance for 4 types of functional materials that are metakaolin, waste tire chip, polypropylene fiber and steel fiber. Here, the tests were planned through an optimal test method using an orthogonal array table with 4 parameters and 3 levels. The statistical analysis adopted the response surface analysis method. Results verified mutual complementary contribution between the materials when using a combination of the functional materials selected as parameters for the strengthening of the fire-resistance of 80 MPa-class high strength concrete. Besides, the optimal conditions of the fire-resistance strengthening materials derived through response surface analysis were a volumetric replacement of silica fume by 80% of metakaolin, a volumetric replacement of fine aggregates by 3% of tire waste chip, and an addition of 0.2% of the whole volume by polypropylene fiber without mixing of steel fiber. In such cases, the basic characteristics as well as the fire-resistant characteristics of high strength concrete were also satisfied.

Study on the Optimum Mixing Condition for Control of Spalling in High Strength Concrete by a Orthogonal Array

This study proceeded to find the optimum mixing rate of a high strength concrete with 80MPa of compressive strength using meta-kaolin, waste tire chips, polypropylene, and steel fiber together for improvement of fire resistance performance. To estimate of optimum mixing rate, the orthogonal array method was used to plan the factors (slump flow, air content, compressive and flexural strength, steel bar temperature and concrete spalling volume) of high strength concretes and experiment was executed. Then the functional relationship of each factor was valuated by general linear model of ANOVA and functional relation between the factors and the data was estimated using response surface analysis. The optimum mixing rate was computed as 80% replacement of silica fume volume by meta-kaolin, 3% replacement of fine aggregates volume by waste tire chips and 0.2% additive rate of polypropylene fiber without steel fiber to the total mixed volume with this modeling of the functional relationship.