Engineering the performance of post-consumer calcium carbonate from carpet in cement-based materials through pre-treatment methods
Published Web Location
https://doi.org/10.1016/j.conbuildmat.2023.130451
Abstract
Using post-consumer carpet calcium carbonate (PC4) in concrete can support a circular economy. Three treatments were evaluated to engineer PC4: furnacing at 600°C, furnacing at 900°C, and milling. Specimens were made with 5 and 15% PC4 replacement for Portland cement and were compared to controls with limestone filler replacement and with only Portland cement. Mortars with PC4 treated at 600°C exhibited 28-day compressive strength comparable to controls. X-ray diffraction and Fourier-transform infrared spectroscopyR show heat treatments led to compositional shifts and removal of polymers. Cumulatively, heat treatments can improve the characteristics of PC4 and could benefit both waste utilization and concrete production.
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