Recovery and Modification of Waste Tire Particles and Their Use as Reinforcements of Concrete

Abstract

Environmental pollution caused by solid wastes is increasing in the last decades; one of these is referred to automotive tires, which are recycled by different methods, including mechanical grinding. One of the most recurrent applications is to use recycled particles as fillers in building materials, as hydraulic concrete. Nevertheless, detrimental values on the mechanical properties are obtained when they are added. For solving these problems, in this work, a novel proposal is to modify the physicochemical properties of the waste automotive tire particles, previously obtained by grinding process, by using gamma irradiation in order to use them as reinforcements of hydraulic concrete. The results show that improvements on the mechanical properties depend of gamma irradiation as well as concentration and size of waste tire particles. Moreover, SEM images are related to mechanical properties; for instance, rough surface of the tire particles changes when applying irradiation; more smooth surfaces are created, due to the cross-linking of polymer chains. Nevertheless, for higher doses, cracks are observed which are produced by scission of the polymer chains.

Polymeric Waste from Recycling Refrigerators as an Aggregate for Self-Compacting Concrete

“…There was a decrease in the dynamic elasticity module by 1% for M5, 12% for M10, 5% for M15 and 58% for M20 and for the static module by 1% for M5, 13% for M10, 1% for M15 and 63% for M20; that is, the concrete becomes less rigid and these results are proportional to those found in the studies of [10,12,37,45]. This behavior can be explained by the incorporation of PW in concrete, which is a less rigid aggregate than natural gravel [46]. It is clear that the dynamic elastic modulus is greater than the static elastic modulus in all situations tested.…”

“…Fragile materials with a large modulus allow fewer deformations when compared to ductile materials that are less rigid [48]. When the less rigid (ductile) material is added to concrete, such as plastics and rubber, the stress-strain curve is modified in the elastic region, becoming less inclined in this stretch and thus decreasing the concrete module [46]. A study by [45] makes a comparison between conventional concrete, conventional SCC and polymer SCC.…”

Compressive Strength Prediction of Rubber Concrete Based on Artificial Neural Network Model with Hybrid Particle Swarm Optimization Algorithm

“…In summary, a database of 307 sets of experimental data has been developed in this paper, where the data were derived from the published literature [ 6 , 8 , 10 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 ]. The database was divided into two parts, of which 277 groups were used for training and the remaining 30 groups were used for testing.…”

Influence of Waste Tire Particles on Freeze–Thaw Resistance and Impermeability Performance of Waste Tires/Sand-Based Autoclaved Aerated Concrete Composites

“…Nevertheless, the waste tire particles are the elastic materials, and thus the free water in the B05 SAAC samples froze and the waste tire distributed in the pores deformed to resist the volumetric expansion pressure of ice during the freeze-thaw cycle. Therefore, the addition of waste tire particles could potentially improve the frost resistance of the SAAC samples [36]. However, when the particle content was 3.0 wt.%, the relative compressive strength of the SAAC samples was low.…”