Abstract
The present work describes the viability of a mortar binder based on two industrial by-products: poly(vinyl chloride) (PVC) particles from scrap and anhydrite (CaSO4) from fluorgypsum. Mortar composites were made incorporating different amounts of PVC particles and cured at constant room temperature during various periods of time. From X-ray diffraction, it was possible to follow the hydration process and to estimate the effect of the PVC particles on anhydrite transformation to gypsum (CaSO4·2H2O). Compressive strength from uniaxial testing was measured from stress-strain curves carried out at room temperature. According to these results, the hydration rates of the composites depend on the concentration of PVC particles and there is an enhancement in their compressive strength as particle content increases, reaching values of 36 MPa after 28 days.
Highlights
Poly(vinyl chloride) poly(vinyl chloride) (PVC) is one of the most commonly used thermoplastic materials in respect to the worldwide polymer consumption
The hydration effect induced by PVC particles on the evolution of reaction (1) was examined from the X-ray diffraction (XRD) patterns of the composites at different times, indicating that the main crystalline compounds found in the cured composites were CaSO4 and CaSO4·2H2O and no evidence was detected of CaSO4·1/2H2O after 3 days
It can be observed that intensity of these peaks changes as the PVC particles content does
Summary
Poly(vinyl chloride) PVC is one of the most commonly used thermoplastic materials in respect to the worldwide polymer consumption. The present work investigates the effects of incorporating particles from recycled PVC scrap as a partial reinforcement for anhydrite on the properties of these composite mortars. This preliminary study emphasizes the effect induced by PVC particles in gypsum hydration and the enhancement in compressive strength as particle content reaches an optimal value, opening the prospective of lightweight gypsum composite. This work presents the preliminary results about the influence of PVC particles on anhydrite and their combined properties for alternative composite binders
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