Parameters of Concrete Modified with Micronized Chalcedonite

Current concrete formulations often incorporate additives to improve performance and sustainability. Standards like PN-EN 197-1:2012 permit additives in specific proportions to enhance properties like rheology and durability. While additives are widely used, their role in managing industrial byproducts remains underexplored. This gap motivated researchers to investigate whether waste materials, such as chalcedonite dust, could serve as viable concrete additives. Prior research has shown that additives can influence hardened concrete properties, but the long-term effects of using mine waste remain unclear. The need to repurpose industrial waste has driven interest in this area. No prior work had resolved how such waste could affect concrete without compromising structural integrity. This study aims to address that uncertainty.

The study sought to determine if chalcedonite dust, a byproduct of aggregate mining, could be used as a 15% additive in concrete without degrading its performance. The researchers aimed to verify if this waste material could meet standard concrete class requirements. The motivation stemmed from the challenge of managing mine waste and the potential to repurpose it in construction. The study focused on three concrete classes—C30/37, C35/45, and C40/50—to assess the impact of the additive. The goal was to ensure that the modified concrete maintained necessary mechanical properties. The researchers also wanted to evaluate rheological and hardened characteristics over time. This approach aligns with broader efforts to integrate industrial byproducts into building materials. The study's findings could inform sustainable construction practices.

The study involved preparing three concrete classes—C30/37, C35/45, and C40/50—each with and without 15% chalcedonite dust additive. The additive was sourced as waste from a mine and had a particle size below 72 μm. Fresh concrete properties were tested for air content, consistency, and bulk density. Hardened concrete was assessed for compressive strength at 7, 14, 28, 56, and 90 days. Absorbability and capillary uptake were also measured to evaluate water interaction. Control series without additives were included for comparison. The PN-EN 206+A1:2016-2 standard guided the experimental setup. The study aimed to ensure the modified concrete met normative requirements.

Concrete mixes with 15% chalcedonite dust achieved the expected strength classes after 28 days of maturation. The compressive strength met or exceeded the PN-EN 206+A1:2014 standard requirements. No significant decrease in strength was observed compared to control series. Absorbability tests showed water absorption below 5%, indicating good resistance to moisture. Capillary uptake results were similar across all tested series. The addition of chalcedonite dust did not compromise the rheological properties of fresh concrete. The study confirmed that the additive could be used without negatively affecting hardened concrete parameters. These findings suggest the material is a viable additive for sustainable construction.

The study demonstrated that chalcedonite dust can be used as a 15% additive in concrete without reducing its strength or durability. The modified concrete met standard requirements for compressive strength and water absorption. The authors propose that this waste material can serve as a sustainable alternative in construction. The findings suggest that mine byproducts can be repurposed without compromising structural integrity. The study confirms the feasibility of using chalcedonite dust as a concrete additive. The results align with the goal of integrating industrial waste into building materials. The authors suggest further research to explore long-term effects and broader applications. These conclusions support the potential for sustainable construction practices.