Use of zeolite-rich rocks and waste materials for the production of structural lightweight concretes
The research paper investigates the potential of using zeolite-rich rocks and industrial waste materials, specifically silicon carbide-bearing sludge from porcelain stoneware tile polishing (DPM), to produce lightweight expanded aggregates for structural and thermo-insulating lightweight concretes. The study utilizes two natural zeolite sources: Cab70 (from Campanian Ignimbrite) and IZclino (a clinoptilolite-rich epiclastite from Turkey). Various mixtures were created by combining these zeolites with DPM and calcareous material (Pozzano limestones) to assess their expanding properties and mechanical characteristics.
The research involved mineralogical and chemical analyses of the raw materials, followed by technological tests to evaluate fusibility and firing behavior. Results indicated that the expansion of the mixtures was significantly influenced by the presence of silicon carbide in the DPM. The addition of Pozzano limestone enhanced expansion but negatively affected the mechanical properties of the aggregates. Three optimal mixtures were identified for producing lightweight aggregates with densities suitable for structural applications (0.8 to 1.0 g/cm³) and for thermo-insulating concretes (0.6 to 0.7 g/cm³).
The study concludes that combining zeolitized materials with DPM can yield lightweight aggregates with desirable properties, making them suitable for various concrete applications. The findings highlight the potential for utilizing industrial waste in construction, contributing to sustainability and cost-effectiveness in the production of lightweight concrete.
This research paper is significant in the field of materials science and construction engineering as it addresses the dual challenges of waste management and the demand for lightweight construction materials. By exploring the use of zeolite-rich rocks and industrial waste, the research contributes to ongoing discussions about sustainable building practices and the circular economy. The findings offer practical benefits to readers, including insights into alternative raw materials for concrete production, potential cost savings, and environmental advantages through waste reduction. The study also lays the groundwork for further research into the use of other industrial wastes in lightweight aggregate production.
