Static mechanical properties of waste rests of recycled rubber and high quality recycled rubber from crumbed tyres used as aggregate in dry consistency concretes

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

“…In fact, the ITZ between rubber aggregates and cement paste increased from 6.65 m to 13.44 m at 10% and 50% sand volume replacement, respectively [38]. However, w/b was often varied with rubber content [38], which could Aiello and Leuzzi [17] Aliabdo et al [32] Batayneh et al [25] Bing and Ning(w/b=0.4) [33] Bing and Ning(w/b=0.6) [33] Correia et al [34] Flores-Medina et al [35] Ling [36] 3 possibly affect the hydration kinetics, mix porosity and ITZ density and width. Scanning Electron Microscopy (SEM) images have shown a lack of bonding (gap) between the rubber and cement paste at their ITZ, as well as limited hydration products surrounding the rubber particles [37][38][39].…”

“…To improve rubber-cement paste chemical/physical bonding [18], several rubber pre-treatments have been investigated such as washing with water [21,35,42], polyvinyl alcohol [43], NaOH [13,41,44,45], Ca(OH) 2 [46], silane coupling agents [47], organic sulphur compounds [48] or acid [40], as well as partial oxidation of the rubber surface [49], exposure to UV radiations [50] or pre-coating with cement [51], mortar [26], silica fume [39], limestone [52] or sand [45]. Despite some success in rubber pre-treatments (strength increase in the range of 3-40% [18,26,41,51,52]), results are often scattered and inconclusive, particularly when mixes with pre-treated rubber are not compared to mixes with as-received rubber [35,42]. The effects of the pre-treatments on the concrete hydration reaction and long term durability have not been investigated.…”

Automotive Wastes

“…Concretes containing waste from recycled rubber showed a decrease in workability and density but an increase in porosity (Flores-Medina et al, 2014). Gesoǧlu et al (2014) also investigated the properties of concrete in which the aggregate was partially replaced by one of three types of rubber (crumb rubber, tire chips or fine crumb rubber).…”

“…Waste Tires. Waste tires have been investigated for use as a raw material in the production of composite materials (Ahmetli et al, 2014;Hamim et al, 2014;Pang and Ismail, 2014a, 2014b, as an additive to concrete (Barbuta et al, 2014;Herrera-Sosa et al, 2014), as an aggregate in concretes (Flores-Medina et al, 2014;Gesoǧlu et al, 2014;Gupta, Chaudhary, and Sharma, 2014;Jusli, Nor, Ramadhansyah, and Zaiton, 2014;Jusli, Nor, Jaya, Haron, and Azman, 2014;Meddah et al, 2014;Serdar et al, 2014), as a Water Environment Research, Volume 87, Number 10-Copyright © 2015 Water Environment Federation modifier in bituminous composites (asphalt pavement) (Karakurt, 2014;Mashaan and Karim, 2014) or as a filler for thermoplastics (Lu et al, 2014). Barbuta et al (2014) suggest that the small loss in mechanical properties (2 to 16%) is balanced by the relatively high use (30%) of waste tires, since the cost of the concrete does not increase significantly.…”

“…Barbuta et al (2014) suggest that the small loss in mechanical properties (2 to 16%) is balanced by the relatively high use (30%) of waste tires, since the cost of the concrete does not increase significantly. -Medina et al (2014) tested two types of waste tire materials as aggregates for concrete: (i) high quality recycled rubber (shredded or crumbed tires with steel and fabric fibers removed) and (ii) waste from recycled rubber (small particles and dust from tire shredding that contains steel and fabric fibers). Both materials, when added to concrete as coarse aggregates at a dose ranging from 20 to 100% (by volume), led to a decrease in the mechanical properties of the concrete.…”