So sánh một số chỉ tiêu kỹ thuật của bê tông đầm lăn xỉ lò cao và bê tông đầm lăn tro trấu

In the contemporary construction landscape, the imperative for sustainable practices is paramount. The increasing generation of industrial and agricultural by-products, such as ground granulated blast-furnace slag (GGBS) and rice husk ash (RHA), presents both an environmental challenge and a significant opportunity for their valorization as supplementary cementitious materials. Their utilization in concrete production not only mitigates waste disposal issues but also offers the potential to enhance material properties and reduce the carbon footprint associated with traditional cement. While extensive research exists on these materials in conventional concrete, their application in roller-compacted concrete (RCC), particularly at higher replacement levels, remains an area requiring further investigation. This study aims to bridge this gap by comprehensively evaluating the technical performance, including workability, compressive strength, and thermal resistance, of RCC incorporating GGBS and RHA as partial cement replacements.

Researchers, civil engineers, material scientists, and construction professionals interested in sustainable construction, concrete technology, and the utilization of industrial and agricultural by-products in roller-compacted concrete.

This paper provides a comprehensive investigation into the comparative technical properties of roller-compacted concrete (RCC), specifically focusing on the influence of incorporating ground granulated blast-furnace slag (slag-RCC) and rice husk ash (RHA-RCC) as partial replacements for cement. The study systematically evaluated workability, compressive strength, and thermal resistance across varying replacement percentages (15%, 30%, and 45% by weight of cement). The methodology involved preparing various RCC mixes, determining optimal water content, and subjecting hardened concrete specimens to standardized tests for mechanical and thermal performance. Material characterization, including chemical composition and particle size distribution of the cementitious materials, was also thoroughly conducted. Key findings indicate that slag-RCC demonstrated improved workability compared to conventional RCC, while RHA-RCC showed a reduction in workability. Regarding compressive strength, slag-RCC exhibited lower 7-day strength but surpassed the control mixes at 28 and 90 days. Conversely, RHA-RCC generally showed lower strength at early ages (7 and 28 days), though the 15% RHA mix eventually outperformed the control by 90 days. Critically, both slag-RCC and RHA-RCC formulations exhibited enhanced thermal resistance when subjected to elevated temperatures, as evidenced by reduced mass loss and higher residual strength compared to the control. These results underscore the potential of utilizing these industrial and agricultural by-products not only for environmental benefits but also for producing RCC with improved long-term durability and high-temperature performance, thereby contributing significantly to sustainable and resilient infrastructure development.