Dynamic leaching assessment of recycled polyurethane-coated tire rubber for sustainable engineering applications DOI Creative Commons
Ahmed Yar Akhtar, Hing‐Ho Tsang

Chemical Engineering Journal, Год журнала: 2024, Номер 495, С. 153351 - 153351

Опубликована: Июнь 21, 2024

Assessing the material ramifications of waste tire rubber stands as a pivotal endeavor for its practical utility. Dynamic leaching analysis emerges indispensable in delineating potentialities within sustainable engineering domains. Waste materials stemming from recycling industries, notably polyurethane-coated (PUcR), may exhibit promising viability owing to attenuated leaching, thus fostering circular economy paradigm. Towards this end, up-flow column percolation tests were conducted on recycled rubber-soil mixture (RSM) alongside PU-coated (PUcRSM). Analysis through Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES) unveiled dynamics assorted metals RSM and PUcRSM, showcasing markedly diminished cumulative zinc content (by 99.4 %) coupled with mitigated electrical conductivity, redox potential, eluate pH. Leveraging HYDRUS-1D analytical modeling predicated advection–dispersion equation further underscored these insights. These findings suggest that PUcR presents itself viable option, distinguished by leachability, suitable wide array applications. applications include vibration damping infrastructure, tunnel linings, asphalt roads, rubberized concrete, lightweight backfill bridges retaining walls, among others. This initiative will contribute substantial quantity over 1 billion used tires produced annually, ultimately supporting ethos assured adaptable repurposing industries.

Язык: Английский

Large‐scale field testing of geotechnical seismic isolation of structures using gravel‐rubber mixtures DOI
Dimitris Pitilakis, Anastasios Anastasiadis, Athanasios Vratsikidis

и другие.

Earthquake Engineering & Structural Dynamics, Год журнала: 2021, Номер 50(10), С. 2712 - 2731

Опубликована: Май 31, 2021

Abstract We present the results of a large‐scale experimental campaign performed on prototype structure EuroProteas in Thessaloniki, Greece, to assess effectiveness gravel‐rubber mixture (GRM) layers underneath shallow foundations as means geotechnical seismic isolation (GSI). found that GSI structures is optimized by increasing rubber content soil‐rubber up 30% per weight. The systems has been investigated numerically and small‐scale experiments. This article seeks fill gap lack full‐scale studies this subject. Three soil pits were excavated backfilled with GRM different weight serve foundation soil. A large number instruments installed structure, foundation, surface, inside beneath fully monitor GSI‐structure systems’ response three dimensions. investigation included ambient noise, free‐ forced‐vibration tests. Our showed layer composed effectively isolates structure. Even 0.5 m thickness (ie, B /6 width) system successfully cuts off practically all emitted waves at (horizontal or vertical) distance from foundation. significant reduction system's stiffness was apparent, leading rocking‐dominant response. rise damping substantial energy dissipation highlight its system.

Язык: Английский

Процитировано

64
Seismic resilience of bridges isolated with traditional and geotechnical seismic isolation (GSI) DOI
Davide Forcellini

Bulletin of Earthquake Engineering, Год журнала: 2023, Номер 21(7), С. 3521 - 3535

Опубликована: Март 7, 2023

Язык: Английский

Процитировано

37
Seismic isolation effect of rubber-sand mixture cushion under different site classes based on a simplified analysis model DOI
Mengtao Wu,

Wenhui Tian,

Jie He

и другие.

Soil Dynamics and Earthquake Engineering, Год журнала: 2023, Номер 166, С. 107738 - 107738

Опубликована: Янв. 9, 2023

Язык: Английский

Процитировано

36
Seismic fragility assessment of geotechnical seismic isolation (GSI) for bridge configuration DOI Creative Commons
Davide Forcellini, Saif Alzabeebee

Bulletin of Earthquake Engineering, Год журнала: 2022, Номер 21(8), С. 3969 - 3990

Опубликована: Фев. 24, 2022

Abstract The seismic vulnerability of bridges may be reduced by the application Geotechnical Seismic Isolation (GSI) below foundations columns and abutments. However, role GSI on response has been limitedly examined in literature. Therefore, this research conducted to study effect applying address aforementioned gap knowledge. Advanced nonlinear dynamic three-dimensional finite element analyses have using OpenSees influence GSI. cases traditional isolated subjected earthquakes considered assess effects. results showed that reduces column while its seems less significant for In addition, fragility curves developed compared provide insights with a probabilistic-based approach. paper useful benchmark design considerations regarding use bridges.

Язык: Английский

Процитировано

39
Analytical design models for geotechnical seismic isolation systems DOI Creative Commons
Hing‐Ho Tsang

Bulletin of Earthquake Engineering, Год журнала: 2022, Номер 21(8), С. 3881 - 3904

Опубликована: Июль 25, 2022

Abstract Geotechnical Seismic Isolation (GSI) can be defined as a new category of seismic isolation techniques that involve the dynamic interaction between structural system and geo-materials. Whilst mechanism various GSI systems their performance have already been demonstrated through different research methods, there is missing link fundamental engineering practice. This paper aims to initiate development in this direction. A suite equivalent-linear foundation stiffness damping models under same framework proposed for four configurations, one which novel combination two existing ones. The exact solutions equivalent properties flexible-base also derived explicitly include inertia strain-dependent materials, are both significant systems. application analytical design has illustrated response history analyses detailed hand-calculation procedure outlined demonstrated.

Язык: Английский

Процитировано

33
Direct shear behavior of gravel-rubber mixtures: Discrete element modeling and microscopic investigations DOI Open Access

Kevin Chew,

Gabriele Chiaro, Jayan S. Vinod

и другие.

SOILS AND FOUNDATIONS, Год журнала: 2022, Номер 62(3), С. 101156 - 101156

Опубликована: Май 6, 2022

In this paper, a newly developed 3-dimentional discrete element model (DEM) for gravel-rubber mixtures (GRMs), namely DEM4GRM, that is capable of accurately describing the macro-scale shear response (from small to large deformation) GRMs in direct box apparatus presented. Rigid gravel grains are modelled as simple multi-shape clumps, while soft rubber particles modeled by using deformable 35-ball body-centered-cubic clusters. Mixtures prepared with different volumetric content (VRC) at 0, 10, 25, 40 and 100%, statically compressed under 30, 60 100 kPa vertical stress then sheared, closely simulating reference laboratory test procedure. The variation micro-scale factors such fabric, normal tangential force anisotropy carefully examined throughout shearing process described means novel micro-mechanical relationships valid GRMs. Moreover, strong-force chains scrutinized identify transition from rigid granular skeleton gain insights on load transfer deformation mechanisms It shown development fabric during related strength GRMs, strongly depends VRC. Besides, appear be primarily formed gravel-gravel contacts (resulting rigid-like mechanical behavior) up VRC = 30%, rubber-rubber (causing soft-like response) beyond 60%. Alternatively, 30% < 60%, predominant network an intermediate behavior observed. This consistent behavioral trends observed macro- responses.

Язык: Английский

Процитировано

29
Experimental study on sand-tire chip mixture foundations acting as a soil liquefaction countermeasure DOI Creative Commons
Georgios Nikitas, Subhamoy Bhattacharya

Bulletin of Earthquake Engineering, Год журнала: 2023, Номер 21(8), С. 4037 - 4063

Опубликована: Март 18, 2023

Abstract Soil liquefaction is a phenomenon associated with strong earthquakes and it can affect large areas. High-rise low-rise buildings, residential structures typically of 1–2 storeys, may be equally prone to the destructive consequences liquefaction. For case high-rise expensive solutions like well-designed piles ground improvement used. However, in smaller structures, this not economically viable. To purpose, current research explores effectiveness novel proposed low-cost protection technique, where soil underneath foundation replaced by sand-tire chip mixture base reaching down certain depth. Series triaxial shaking table tests were performed for range parametric scenarios to, mainly mechanistically, assess such mitigation since similar previous studies are extremely limited. The have shown that closest considered surface, thicker higher tire ratio, more effective become on controlling pore pressure rise leads

Язык: Английский

Процитировано

19
Dynamic properties of recycled polyurethane-coated rubber-soil mixtures DOI Creative Commons
Ahmed Yar Akhtar, Hing‐Ho Tsang

Case Studies in Construction Materials, Год журнала: 2023, Номер 18, С. e01859 - e01859

Опубликована: Янв. 18, 2023

A large quantity of end-of-life tire (ELT) rubber is being blended with thermoplastic polyurethane to provide a durable and ecologically friendly material for flexible surfaces, while significant elastomeric waste (left-over cut-outs) also generated. These materials can be used efficiently seismic isolation vibration damping at minimal cost, process known as frugal innovation. In this regard, (TPE) material, which polyurethane-coated (PUcR), obtained from the recycling industry, explored in study. Herein, we targeted evaluate stiffness energy dissipation capabilities TPE or PU-coated rubber, which, best our knowledge, has never been reported before. To that end, series cyclic triaxial tests were carried out on rubber-soil mixtures. comparison untreated mixtures, shear modulus mixtures reduces by 5.5–12.7%, ratio increases up 12.6%.

Язык: Английский

Процитировано

18
Energy Dissipation Efficiency of Geotechnical Seismic Isolation with Gravel-Rubber Mixtures: Insights from FE Non-Linear Numerical Analysis DOI Creative Commons
Davide Forcellini, Gabriele Chiaro, Alessandro Palermo

и другие.

Journal of Earthquake Engineering, Год журнала: 2024, Номер 28(9), С. 2422 - 2439

Опубликована: Фев. 12, 2024

This paper provides new and useful insights into the performance efficiency of geotechnical seismic isolation (GSI) systems with gravel-rubber mixtures containing 10%, 25% 40% volumetric rubber content (VRC). Finite element numerical models were developed in OpenSees subjected to sinusoidal ground motions varying input base acceleration frequency. The best was attained for VRC = at a frequency 8 Hz. Using newly GSI index, energy dissipation found vary between good excellent, while that 10% is poor.

Язык: Английский

Процитировано

7
Small-strain dynamic characteristics of multilayered rubber-sand composites DOI
Wei Liang, Mingxia Wu, Fangzhou Liu

и другие.

Geosynthetics International, Год журнала: 2025, Номер unknown, С. 1 - 16

Опубликована: Апрель 12, 2025

The rubber sand mixture (RSM) is an effective seismic isolation material, and understanding its layered structure essential for optimizing performance in geotechnical earthquake engineering. This study investigates the dynamic characteristics of multi-layered RSM composites, identifying optimal content (RC) initial parameters their use as buffers. To this end, a series resonant column tests were conducted to compare differences between rubber-sand (LR-S) conventional by measuring shear modulus damping ratio at small strain amplitudes. experiments on LR-S involved constructing configurations with three-, five-, seven-layer structures, while varying RC confining pressure assess influence composite’s behavior. Results show that reduced 6–13 times compared RSM. Additionally, decreases increasing RC, contrasting As rises, ratios pure decrease, whereas increases, akin rubber. demonstrates continuous upward trend strain. These findings are pivotal designing mitigation underground systems.

Язык: Английский

Процитировано

1