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Keywords = PET-reinforced cementitious mixtures

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26 pages, 6047 KiB  
Review
On the Cementitious Mixtures Reinforced with Waste Polyethylene Terephthalate
by Cristiano Giuseppe Coviello, Armando La Scala, Maria Francesca Sabbà and Leonarda Carnimeo
Materials 2024, 17(21), 5351; https://doi.org/10.3390/ma17215351 - 31 Oct 2024
Cited by 4 | Viewed by 1681
Abstract
The last decade was dominated by a serious problem that now affects all the planet’s natural ecosystems: the increasing growth of plastics and microplastics that are difficult to dispose of. One strategy to mitigate this problem is to close the life cycle of [...] Read more.
The last decade was dominated by a serious problem that now affects all the planet’s natural ecosystems: the increasing growth of plastics and microplastics that are difficult to dispose of. One strategy to mitigate this problem is to close the life cycle of one of them—polyethylene terephthalate (PET)—by reusing it within the most common building materials, such as mortars and concretes. The reuse of PET waste as aggregates also allows us to limit the CO2 emissions released during the production of natural aggregates. This paper analyzes the outcomes of many studies carried out on the characteristics of cementitious mixtures reinforced with waste PET material. Many researchers have demonstrated how PET used as reinforcement of mortars and concretes can produce an increase in the mechanical strengths of the corresponding cementitious mixtures without PET. The tensile strength of this resin is higher than that of concrete; so, by combining the two materials it is possible to obtain a mixture with an overall higher tensile strength, resulting in increased flexural strength and reduced cracking. Using an effective size of PET fibers, it is possible to achieve an increase in the ductility and toughness of the cementitious mixture. Several studies reveal that PET reinforcement reduces the density with a consequent decrease in weight and structural loads, while the workability increases using spherical and smoother PET aggregates. Full article
(This article belongs to the Special Issue Advances in Natural Building and Construction Materials)
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16 pages, 8047 KiB  
Article
Mechanical and Thermal Effects of Using Fine Recycled PET Aggregates in Common Screeds
by Cristiano Giuseppe Coviello, Paola Lassandro, Maria Francesca Sabbà and Dora Foti
Sustainability 2023, 15(24), 16692; https://doi.org/10.3390/su152416692 - 9 Dec 2023
Cited by 18 | Viewed by 1893
Abstract
The increasing consumption of plastics has necessitated the need to find a sustainable solution to reuse PET within common building materials. Recycled PET reinforcement would reduce plastic waste that is difficult to dispose of and CO2 emissions, representing a sustainable solution for [...] Read more.
The increasing consumption of plastics has necessitated the need to find a sustainable solution to reuse PET within common building materials. Recycled PET reinforcement would reduce plastic waste that is difficult to dispose of and CO2 emissions, representing a sustainable solution for generating lighter building materials. The goal of this work was to define a new cementitious mixture design and to study the mechanical and thermal behavior of three typologies of screeds with fine recycled polyethylene terephthalate (PET) aggregates. A weight percentage of PET of 1%, 2%, and 3% was used. The test results for sustainable screeds (S-Screeds) with waste PET were compared with a reference screed without the addition of plastic. In the fresh state, the workability and the air content were measured, while in the hardened state, the density, thermal conductivity, and compressive and flexural strength were investigated. These properties showed improvement for some tested S-Screeds after the introduction of fine (a few millimeters in size) and irregularly shaped waste plastic aggregates. Scanning electron microscopy (SEM) analysis showed the presence of a release surface between the cementitious mixtures and the plastic material, even if the mechanical interaction between the matrix and PET still existed. Full article
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