Evaluation of the toxicity of pervious concretes with WFS through germination tests with Eruca sativa (arugula) and Triticum aestivum (wheat) seeds

Matéria (Rio de Janeiro), Journal Year: 2025, Volume and Issue: 30

Published: Jan. 1, 2025

ABSTRACT Concrete is the most used construction material, which results in harmful impacts on environment due to consumption of natural resources. Hence need use alternative materials, e.g., waste from sector and even other production sectors. This context includes development concrete with sustainable functionality, such as pervious incorporation foundry sand (WFS), a generated by sector. However, there scientific gap focusing environmental viability concretes. In this sense, study aims evaluate toxicity pevious concretes WFS, through germination tests Eruca sativa (arugula) Triticum aestivum (wheat) seeds. The statistical analysis showed that was no significant effect WFS rate for both seeds used. Regarding root growth, it observed II (>% Portland cement) had lower impact arugula (more sensitive). Therefore, developed found be safe relation phytotoxicity.

Language: Английский

Waste Foundry Sand as an Alternative Material in Road Construction

Sustainability, Journal Year: 2025, Volume and Issue: 17(6), P. 2370 - 2370

Published: March 7, 2025

The generation of solid waste and the use non-renewable natural resources in foundry industry are environmental challenges that require search for solutions guarantee application circular economy cleaner production principles. Studies on reuse Foundry Sand Waste (FSW) generated this process can minimization current impact contribute to achievement sustainability industrial sector. objective study is assess feasibility utilizing WFS construction pavement bases sub-bases, combination with sandy soil hydrated lime. laboratory experimental program included evaluation compaction characteristics, California Bearing Ratio (CBR), compressive strength, resilient modulus. results indicate addition 25% 50% yields predicted performance levels ranging from good excellent. inclusion lime enables mixtures be employed sub-bases bases, while increased content further enhances load-bearing capacity by up 60% 75% WFS, respectively.

Language: Английский

Utilizing Iron Ore Tailings for the Development of a Sustainable Alkali-Activated Binder

Mining, Journal Year: 2025, Volume and Issue: 5(2), P. 26 - 26

Published: April 2, 2025

The increasing production of iron ore has led to the accumulation tailings (IOTs), which pose significant environmental and safety risks when stored in dams. This study investigates potential IOTs as a precursor alkali-activated binder systems, aiming provide sustainable solution for mining waste management. Industrial calcium carbide lime sodium silicate (Na2SiO3) were used activators varying concentrations (Na2SiO3: 10%, 15%, 20%, 25%, 30%; lime: 5%, 7.5%, 10%), with curing conditions 23 °C 7 days. Techniques including unconfined compressive strength tests, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), metal leaching tests employed evaluate mechanical performance binders. results reveal that mixture containing 20% Na2SiO3 10% achieved highest 0.33 MPa at also showed negligible leaching, meeting standards. These findings confirm viability using development durable, eco-friendly construction materials, offering scalable management promoting circular economy principles sector.

Language: Английский