Mix Proportion Design and Mechanical Properties of Recycled PET Concrete

摘要

The mix proportion and mechanical properties of polyethylene terephthalate (PET) concrete were studied by orthogonal test. PET concrete was produced by mixing melted PET with aggregate and mineral admixtures. The effects of several factors on the properties of PET concrete were investigated. These factors included: (1) coarse aggregate type, (2) mineral materials, (3) PET and mineral/aggregate (PETAM/AG) ratio, (4) sand ratio, (5) PET/mineral (PET/MA) ratio, and (6) maximum particle size of coarse aggregate. The results showed that the most important factor was PETAM/AG, followed by sand ratio and PET/MA. Samples with 10 mm coarse aggregate had the highest compressive strength of 36 MPa. The compressive strength decreased 8.6 and 37 % as the coarse aggregate maximum particle sizes changed from 10 to 4.75 and 13 mm, respectively. There was no significant difference in flexural strength when the sand ratio changed from 35 to 68 %. The strength of PET concrete with basalt was higher than that of concrete with limestone. The concrete containing fly ash and 5 % talc had the highest strength followed by concrete with fly ash, Portland cement (PC), fly ash with 5 % asphalt, without any mineral. The best mix proportion of PET concrete was PETAM/AG of 1:3, sand ratio of 35 % and PET/fly ash of 2:1.