Investigation on the properties of concrete tactile paving blocks made with recycled tire rubber

Fresh and hardened properties of self-compacting concrete modified with lightweight and recycled aggregates

“…Contrary to what was observed in the CR and C5 mixtures, there was an increase in the compressive strength of C5 to C10 around 15%. This phenomenon demonstrates that there was a better packaging of the rubber residue when the substitution was 10%, that is, in the substitution of 5%, the rubber does not distribute with uniformity in the concrete, causing the resistance drop due to the low value of modulus of elasticity of the polymer aggregate and voids caused by the entrainment of air, which are not filled [26,27]. When the rubber is evenly distributed, there is also a uniform absorption of mechanical energy in the concrete, thus increasing the compressive strength; however, when there is an excessive addition of rubber, its particles become the least resistant point of the concrete, because it has a weak bond with the cement matrix due to its coarse and non-stick granulometry [3,26,27].…”

Optimisation of rubberised concrete with high rubber content: An experimental investigation

“…Other factors that reduce RuC strength include segregation, lower overall stiffness of the composite and casting and consolidation techniques [28]. Whilst such reduction is well documented in the literature [14,17,24,25,[29][30][31], strength seems to be influenced by rubber content, size and properties, as well as mix parameters and proportions (i.e. water to binder ratio (w/b), type of chemical admixture and binder material).…”

“…To date, the use of RuC has been mainly limited to: 1) Non-structural applications such as road barriers [7], thin overlays [8], concrete panels [9], paving blocks [29,31] and applications for thermal and acoustic insulation [5,6], and 2) Low-medium compressive strength structural concrete with reduced weight and increased ductility, as well as resistance to vibrations, impact and cyclic loads [6,[10][11][12].…”

Evaluation of microcracks in the interfacial transition zone of recycled rubber concrete

“…A possible effective use of waste tire rubber is to incorporate them into cement‐based materials to replace some of the natural aggregates . As a new engineering technology, synthesizing concrete with recycled waste rubber is a value‐addition and eco‐friendly alternative approach . Over the past decade, recycling of rubber tires as a replacement material for fine or coarse aggregates used in concrete mixes has been extensively investigated.…”