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By  Lynn L. Bergeson

On April 13, 2021, Montana State University (MSU) researchers from its Norm Asbjornson College of Engineering published an article entitled “Biomineralization of Plastic Waste to Improve the Strength of Plastic-Reinforced Cement Mortar.” The study evaluates calcium carbonate biomineralization techniques applied to coat plastic waste and improve the compressive strength of plastic-reinforced mortar (PRM), a type of plastic-reinforced cementitious material (PRC). In an effort to reduce the environmental impact of plastic pollution, the study tested two types of biomineralization treatments: enzymatically induced calcium carbonate precipitation (EICP) and microbially induced calcium carbonate precipitation (MICP). While MICP treatment of polyethylene terephthalate (PET) resulted in PRMs with compressive strength similar to that of plastic-free mortar, EICP-treated PET resulted in weaker strength than that of MICP. MICP treatment, however, affects differently the compressive strength of PRM in various types of plastics. According to the researchers, further work is needed to understand the impact of MICP treatment on interfacial strength. The authors hope that greater knowledge of this mechanism will lead to the establishment of biomineralized PRC as a high-volume method to reuse plastic waste.