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Analysis of the effects of dioctyl terephthalate obtained from polyethylene terephthalate wastes on concrete mortar: A response surface methodology based desirability function approach application

Şimşek, Barış, Uygunoğlu, Tayfun, Korucu, Haluk, Kocakerim, Mehmet Muhtar
Journal of cleaner production 2018 v.170 pp. 437-445
alcoholysis, concrete, construction materials, corrosion, electrical resistance, plasticizers, poly(vinyl chloride), polyethylene terephthalates, response surface methodology, thermal conductivity, wastes
One of the most effective methods to dispose the waste polyethylene terephthalate is to obtain the dioctyl terephthalate by the alcoholysis. The obtained dioctyl terephthalate by the alcoholysis is used as a plasticizer especially in order to generate the polyvinyl chloride. Polyethylene terephthalate is generally removed by means of adding it directly to the concrete mix for the construction material. In this study; instead of using it directly in the construction materials, the alcoholysis product was obtained from the polyethylene terephthalate which was used in the concrete grout. The impact of dioctyl terephthalate on the concrete grout's properties some like electrical, mechanical and fluidity properties was analyzed by the response-surface method and it was compared with the polyethylene terephthalate additive concrete grout for those properties. The results show that the electrical resistivity of concrete increased with the increasing amount of dioctyl terephthalate. The optimum dioctyl terephthalate mixed concrete grout has got 29.90-times higher electric resistance than the reference concrete grout. Moreover, 10% of the dioctyl terephthalate mixed normal weight concrete with a lower thermal conductivity of 30.3% is higher electrical resistivity of 657.7% rather than according to 10% of the polyethylene terephthalate mixed normal weight concrete. These results also show that the dioctyl terephthalate should be preferred instead of the polyethylene terephthalate in order to produce the corrosion resistance concrete mortar.