Experimental seismic characterisation of gravel-granulated tyre mixtures and design implications (2021)
Worldwide, due to the large amount of end-of-life tyre (ELT) stockpiles, reusing and recycling of ELTs in civil engineering applications have become a priority, significantly contributing to lessen environmental and health issues related to the ever-growing ELT disposal. In this context, in Aotearoa New Zealand, ELT-derived granulated tyre rubber has been blended with gravel and concrete to form synthetic materials for use in the development of “eco-rubber geotechnical seismic-isolation (ERGSI) foundation systems” for medium-density low-rise residential buildings. The specific purpose of the study reported in this paper is to quantify the seismic mitigation provided by different percentage of rubber to gravel to create an optimum energy-dissipative layer placed beneath a fibre-reinforced rubberised concrete raft foundation. To do so, a prototype ERGSI foundation system placed on gravel-rubber layers with 0, 10%, 25%, and 40% of rubber (by volume) were tested in the laboratory by means of impact tests. By using the wave propagation theory and cross power spectral density frequency response function, modal parameters such as the natural frequency and damping ratio of the different layers were obtained. It was found that, at the foundation level, the peak acceleration decreased and the natural frequency increased with increasing the rubber content. This corresponds to an increase in both the damping and seismicisolation effects, confirming the effectiveness of ERGSI systems. Considering also strength and compression requirements under static loads, it is proposed that the optimum seismic dissipative gravel-rubber layer for ERGSI foundation systems should have 25-30% rubber content
CitationTasalloti A, Chiaro G, Young J, Ross O, Palermo A, Granello G (2021). Experimental seismic characterisation of gravel-granulated tyre mixtures and design implications. Christchurch: 2021 NZSEE Annual Conference. 14/04/2021-16/04/2021.
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ANZSRC Fields of Research40 - Engineering::4005 - Civil engineering::400506 - Earthquake engineering
40 - Engineering::4005 - Civil engineering::400502 - Civil geotechnical engineering
40 - Engineering::4005 - Civil engineering::400505 - Construction materials
40 - Engineering::4011 - Environmental engineering::401102 - Environmentally sustainable engineering
40 - Engineering::4016 - Materials engineering::401602 - Composite and hybrid materials
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Direct shear behavior of gravel-rubber mixtures: Discrete element modeling and microscopic investigations Chew K; Vinod JS; Tasalloti A; Allulakshmi K; Chiaro, Gabriele (Elsevier BV, 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 ...
Sustainable recycling of end-of-life tyres in civil (geotechnical) engineering applications: turning issues into opportunities in the New Zealand context Chiaro G; Tasalloti A; Banasiak LJ; Palermo A; Granello G; Rees S (2020)End-of-life tyres (ELTs) are non-reusable tyres in their original form. They enter a waste management system based on product/material recycling and energy recovery or go to disposal. In New Zealand, only 30% of the 5 ...
Chew K; Tasalloti A; Vinod JS; Allulakshmi K; Chiaro, Gabriele (2022)This paper provides a summary of the main outcomes of a research activity aimed at facilitating the use of gravelrubber mixtures (GRMs) in geotechnical engineering applications. Specifically, the results of direct shear ...