article · Case Studies in Construction Materials
This research investigated the use of sugarcane leaf ash (SLA) and granite dust (GD) as partial cement replacements, and recycled fine aggregate (RFA) as a partial natural fine aggregate (NFA) replacement in ultra-high performance concrete (UHPC). The aim was to develop more eco-friendly concrete options. The study examined the mechanical and transport properties of UHPC with varying replacement ratios for SLA/GD (20% to 50%) and RFA (25% to 100%). It also looked at the effect of elevated temperatures and microstructural characteristics. Results showed that a 20% replacement of cement with either SLA or GD was optimal for mechanical properties, with SLA performing better than GD. A 25% replacement of NFA with RFA also yielded the best mechanical and transport properties.
Cement production contributes to environmental issues, while agricultural and industrial waste materials are abundant. This research demonstrates how sugarcane leaf ash, granite dust, and recycled fine aggregate can be incorporated into ultra-high performance concrete. This approach offers a sustainable way to reduce waste, lower the environmental impact of concrete production, and potentially enhance material properties for construction.
This research provides a foundation for developing more sustainable ultra-high performance concrete formulations using waste materials. Potential users include concrete manufacturers and construction companies looking for greener building materials and ways to reduce raw material costs. The findings are at an applied research stage, indicating that these material combinations could be further developed for specific high-strength construction applications, such as precast elements or specialised infrastructure projects.
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A significant quantity of cement is necessary for the production of ultra-high-performance concrete (UHPC). However, some environmental issues are associated with cement production. The worldwide agricultural growth increases ash from agricultural waste (AW). Furthermore, industrial waste (IW) generated throughout the stone-cutting and processing has increased due to the growing demand for granite stone in construction. This research conducted a unique study that involved comparing the use of sugarcane leaf ash (SLA) as AW and granite dust (GD) as IW as partial substitutes for cement in the production of eco-friendly UHPC. The effect of employing SLA and GD with replacement ratios ranging from 20% to 50% on the mechanical and transport properties of UHPC was studied. In addition, this research investigated the effectiveness of partial replacement of natural fine aggregate (NFA) by recycled fine aggregate (RFA) with ratios ranging from 25% to 100% on the UHPC qualities. Moreover, the effect of elevated temperatures on the UHPC and the microstructural examination were investigated. Results demonstrated that the optimum replacement ratio of SLA or GD from cement was 20%, showing the best mechanical characteristics of the UHPC. For example, after 28 days of casting, the compressive strength increased by 12.16% and 8.44% when SLA and GD were added to the UHPC mix, respectively. Additionally, the 25% replacement ratio of RFA from NFA presented the best mechanical and transport properties of the UHPC. The mixes containing SLA positively affected the UHPC higher than those containing GD.
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DOI: 10.1016/j.cscm.2023.e02266
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