Abstract
Plastic waste recycling for the development of new building materials, such as cementitious composites, appears to be one of the best solutions to get rid of this type of waste. This operation has many economic and ecological advantages. The present study proposes some solutions for the recovery of plastic waste from PET (polyethylene terephthalate) bottles in order to obtain, after heat treatment at 290 °C followed by step cooling, a light composite material (PET-siliceous sand) with a hardness close to that of natural rock. The structure of the material obtained is characterized first; then the effect of this composite, with different substitution rates of natural aggregate, on the behavior of an industrial screed is studied. Afterwards, some specific recommendations for the uses of this screed, and possibly of the composite itself, are given. Although the main effects of certain polymeric additives on the mechanical properties of mortars are known, the mechanisms that are responsible for these effects are not yet well understood. Techniques such FTIR, XRD, SEM and differential scanning calorimetry (DSC) are analytical tools that can be used for the characterization and expertise of this type of composites, particularly the industrial composite screeds. Results from the present article enabled us to state that the composition of the materials obtained remains qualitatively unchanged and that no chemical interaction was observed between the mineral species and the waste PET lightweight aggregate (WPLA) or the composite itself; in fact, no new compounds were formed. In addition, the differential scanning calorimetry (DSC) technique allowed us to conclude that the addition of WPLA has an influence on cement hydration. The thermo-mechanical characterization of WPLA made it possible to observe an excellent arrangement between the PET and siliceous sand. Therefore, the development of WPLA may be another solution for a number of applications in the field of eco-materials for construction and building.
Highlights
In the field of construction, a screed is a mortar layer made of cement, resin or lime, applied on the ground and intended to flatten, level, come on a support and / or coat elements, such as a heating floor, and to receive the upper layers, like tiles, a flexible floor, a floating or glued floor (Fiches Techniques G11, 2013)
The present study proposes some solutions for the recovery of plastic waste from polyethylene terephthalate (PET) bottles in order to obtain, after heat treatment at 290 °calcareous sand (Cs) followed by step cooling, a light composite material (PET-siliceous sand) with a hardness close to that of natural rock
Results from the present article enabled us to state that the composition of the materials obtained remains qualitatively unchanged and that no chemical interaction was observed between the mineral species and the waste PET lightweight aggregate (WPLA) or the composite itself; no new compounds were formed
Summary
In the field of construction, a screed is a mortar layer made of cement, resin or lime, applied on the ground and intended to flatten, level, come on a support and / or coat elements, such as a heating floor, and to receive the upper layers, like tiles, a flexible floor, a floating or glued floor (Fiches Techniques G11, 2013). Composite mortars and concretes, plastic aggregates (Alfahdawi et al 2016; Gu and Ozbakkaloglu, 2016) and composite aggregates WPLA (Akçaözoğlu et al 2013; Choi et al 2009; Zuccheratte et al 2017) have been formulated so far. These new applications came to respond to specific demands expressed by building and civil engineering professionals, in particular for the acoustic and thermal comfort and durability.
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