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Maintaining the mechanical properties and long-term operational safety is considered the main challenge for composite materials under cyclic loading. This work presents mechanical performance of tri-component composites based on multiwall carbon nanotubes (MWCNTs), carbon fibres (CFs) and epoxy resin, and their electrical conductance property for applications like strain gauges. As a result of incorporation of MWCNTs into the epoxy resin in the composite’s morphology, their electrical, mechanical and piezoresistive performance can indicate the self-sensing of carbon fiber reinforced epoxy re...

Mechanical behaviour of a rock mass is significantly affected by the occurrence of inherent discontinuities (such as joints, fractures, bedding planes, etc.), therefore comprehensive knowledge of the effect of such discontinuities is necessary for the safe and economic design of geo-structures in or on a rock mass. Generally, the typical shear behaviour of a rock joint has been investigated under monotonic loading conditions, ignoring the fact that most of the time the structures embedded in a rock mass are subjected to cyclic loads, and it is likely that such structures fail to sustain the in...

In recent years, there has been an increasing interest in the use of rubber aggregates derived from waste tyres in order to improve track performance, and Rubber Intermixed Ballast System (RIBS) demonstrated some of the important geotechnical properties that reduce ballast deterioration by partially replacing ballast particles using rubber granules ranging from 9.5 to 19.5 mm. This paper focuses on evaluating the characteristics of RIBS subjected to cyclic loads by conducting large-scale triaxial tests for changing rubber contents (0–15% by weight) under confining pressures (30–60 kPa) and...

A new concept of critical shear strain ετcritical of rock joint under cyclic loading is presented, and the role of ετcritical in evaluating the sliding potential of rock joint is highlighted. A series of cyclic triaxial tests was conducted on a cylindrical rock joint specimen with a replicated rough surface representing a joint roughness coefficient JRC value of 12.6 oriented at 60° with respect to the horizontal plane. The experimental results indicate that the onset of instability of rock joint is suppressed with increase in confining pressure and number of loading cycles N until the no...

Abstract The interest in the utilization of granular waste materials as construction fills in lieu of quarried natural aggregates has been increasing recently, resulting in more sustainable and cost-effective industry practices being adopted. This study proposes a mixture of coal wash (CW; a by-product of coal mining) and rubber crumbs (RC; shredding of waste rubber tires) as a potential capping composite for railways. A series of cyclic triaxial tests mimicking typical rail traffic loads were conducted on CWRC mixtures with and without rest periods to gain an insightful understanding of the ...