article · Case Studies in Construction Materials
Ultra-high-strength concrete can incorporate several recycled and industrial by-products to enhance its mechanical performance. Combining ferrosilicon alloy industrial waste, recycled steel fibres recovered from scrap tyres, and recycled granite can substitute conventional ingredients such as cement and natural dolomite aggregates. Evaluations across various mix ratios measured slump values, compressive strength, splitting tensile strength, flexural strength, and modulus of elasticity, accompanied by microstructural examinations of ferrosilicon. Optimal performance occurs when replacing fifty percent of natural dolomite with recycled granite alongside a twenty percent substitution of cement with ferrosilicon. This specific combination yields an 11.11 percent increase in compressive strength relative to the reference mixture. Additionally, integrating recycled steel fibres alters the failure mode of the concrete cylinders, successfully preventing brittle failure and encouraging ductile behaviour under load.
Developing high-performance concrete from recycled materials addresses pressing sustainability challenges in the building sector. Replacing cement and virgin quarried stone with ferrosilicon alloy waste, recycled granite, and discarded tyres can divert substantial industrial waste from landfills. Furthermore, enhancing concrete strength while ensuring ductile rather than sudden, brittle failure improves structural safety in demanding construction applications.
This research targets concrete manufacturers, precast component producers, and civil engineering contractors seeking greener ultra-high-strength materials. The work demonstrates performance through applied laboratory testing of concrete samples, representing an applied and tested stage of development. Translating these findings into commercial practice will require pilot-scale batching, standardisation of recycled material inputs, and field-based evaluations of durability and long-term structural integrity under operational loads.
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This study investigates the utilisation of a combination of a few materials with various ratios, such as ferrosilicon (FS), recycled steel fibres (RSFs) resulting from waste tires and recycled granite (RG), to enhance the mechanical behaviour of ultra-high-strength concrete (UHSC). FS is a novel material that may be utilised as a partial replacement for the cement generated from the industrial waste product of FS alloy. The replacement ratios of FS used in this study are 10%, 20% and 30%. In addition to RSFs resulting from waste tires with ratios by volume of 0.5%, 1%, 1.5% and 2%, RG with replacement ratios of 25%, 50%, 75% and 100% from natural dolomite are used. The outcomes are represented in slump values, compressive strength, splitting tensile strength, flexural strength and modulus of elasticity. Microstructure analysis is also conducted to demonstrate the details of FS. Results reveal that the relatively better ratios to obtain high mechanical properties are 50% replacement of RG from natural dolomite and 20% replacement of FS from cement. The compressive strength of this mixture increases by about 11.11% over that of its reference mixture. The inclusion of RSFs obviates the brittle failure pattern of the tested cylinders, and a ductile failure occurs.
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DOI: 10.1016/j.cscm.2023.e01903
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