Potential of mortars with PCR-PET for permeable pavements in sustainable urban drainage

Resumo

Objective - The study aims to investigate the potential of mortars containing PCR-PET (Post-Consumer Recycled Polyethylene Terephthalate) for constructing permeable pavements, focusing on sustainable urban drainage. The research seeks to demonstrate how partially replacing natural sand with PCR-PET influences the physical and mechanical properties of mortars, with an emphasis on permeability and environmental impact reduction.

Methodology - The scientific method involved formulating mortars with varying proportions of sand replaced by PCR-PET (0% to 40%). Physical and mechanical tests were conducted, including compressive strength, flexural tensile strength, water absorption by immersion, void index, capillary coefficient, water retention, air content, and density. Data were statistically analyzed using ANOVA and Tukey’s test to assess significant differences between compositions.

Originality/Relevance - The study addresses the theoretical gap related to sustainable alternatives in civil construction, reducing reliance on natural resources and promoting plastic waste recycling. Academically, it is significant for integrating recycled materials into permeable pavements, contributing to the literature on green infrastructure and stormwater management.

Results - Key findings showed that: The addition of PCR-PET reduced mechanical strength (compressive and flexural) but increased porosity and permeability; Water absorption and void index increased with higher PCR-PET content, indicating improved water infiltration; Density and specific mass decreased, making the material lighter and suitable for low-traffic applications.

Theoretical/Methodological Contributions - The study provides empirical evidence on balancing mechanical strength and permeability in PCR-PET mortars, proposing a standardized methodology for evaluating such materials. The results contribute to the theoretical foundation on sustainable composites and permeable pavements.

Social and Environmental Contributions - Reduces plastic waste disposal and natural sand extraction, promoting a circular economy and ecosystem preservation; Enhances urban stormwater management, mitigating floods and heat islands while improving thermal comfort. Applications in low-traffic pavements (sidewalks, bike lanes) offer an affordable and sustainable solution for cities.