Research on the Hydration Mechanism and Mechanical Properties of Stainless Steel Slag–Fly Ash Recycled Concrete in Pavements
Liuyun Huang, Sixian Chen, Zhuxin Lan, Yuliang Chen, Tun Li
TL;DR
This study explores how combining industrial by-products like stainless steel slag and fly ash with recycled aggregates can create strong, sustainable concrete for pavements.
Contribution
The novel contribution is the discovery of synergistic hydration reactions between AOD slag and fly ash that enhance concrete strength when combined with recycled aggregates.
Findings
Concrete with 50% recycled aggregate replacement and 10–20% AOD slag and fly ash replacement achieves optimal mechanical performance.
Compressive strength reaches 33.9 MPa, significantly higher than using AOD slag or fly ash alone.
Flexural and tensile strengths also improve, meeting pavement requirements while promoting resource reuse.
Abstract
This study systematically investigates the effects of slag from the argon–oxygen decarburization (AOD) process, fly ash, and recycled aggregate (RA) replacement ratios on the mechanical properties of mortar samples and AOD slag–fly ash recycled concrete. The sustainable reuse of industrial by-products and construction waste is significant for reducing environmental impact and resource consumption during pavement construction. Experimental results demonstrate that when AOD slag and fly ash are used in combination, they undergo synergistic hydration reactions, producing calcium hydroxide (CH), calcium silicate hydrate (C-S-H) gel, and ettringite (AFt), resulting in superior strength compared to the individual use of either material. This research reveals that concrete strength decreases significantly when the recycled aggregate replacement ratio exceeds 50%; therefore, RA = 50% was…
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Taxonomy
TopicsRecycled Aggregate Concrete Performance · Concrete and Cement Materials Research · Recycling and utilization of industrial and municipal waste in materials production