Design and assessment of eco-friendly ultra-high performance concrete with steel slag powder and recycled glass powder

An eco-friendly UHPC was designed by the modified Andreasen and Andersen packing model and prepared with cement partially replaced by steel slag powder (SSP) and glass powder (GP) at a fixed mass ratio of 2:1. An improved strengths and resistance to drying shrinkage was obtained with a combined replacement of SSP and GP, and the best one was achieved at the 20% replacement ratio. The leaching of Ca2+, Al(OH)(4), and SiO32 ions from SSP and GP promoted the hydration of cement. The potential cementitious activity of SSP and the pozzolanic activity of GP contributed simultaneously to the formation of extra hydration products, especially the high density C-S-H. As a result, the pore structure of the paste matrix was refined and the steel fiber/paste was enhanced. The UHPC developed with SSP and GP had lower carbon emissions and non-renewable energy consumption, which provides possibilities for its industrial application.

Automated summary

An eco-friendly ultra-high performance concrete (UHPC) was designed by partially replacing cement with steel slag powder (SSP) and glass powder (GP) at a fixed mass ratio of 2:1 based on the modified Andreasen and Andersen packing model. The combination of SSP and GP replacement improved the strength and resistance to drying shrinkage, with the best performance achieved at a 20% replacement ratio. The leaching of ions from SSP and GP promoted cement hydration, leading to the formation of extra hydration products, such as high density C-S-H, which refined the pore structure of the paste matrix and enhanced the steel fiber/paste interaction. The UHPC developed with SSP and GP exhibited lower carbon emissions and non-renewable energy consumption, implying its potential for industrial applications.