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<p>Cementitious composites are the predominant artificial material, accounting for a production volume of 25 billion tonnes and contributing to 5% of greenhouse gas emissions. Concrete composites emit a substantial amount of carbon dioxide into the atmosphere. Therefore, the replacement of concrete composite raw material is of utmost importance. The practice of using industrial by products like as lime sludge (LMS) and wollastonite powder (WLP) in cementitious composites is increasingly being used to minimise the carbon emissions of this sector. This approach tackles the management of industrial outputs in two distinct ways. The mechanical and durability properties&#xa0;of cementitious composite products with several components must be acknowledged. The primary objective of this research is to assess the mechanical strength and durability of binary blended concrete using LMS and WLP. The binary blended&#xa0;were produced using LMS (5%, 10%, 15% and 20%) and WLP (5%, 10%, 15% and 20%) binders. Environmental waste management has become a pressing issue. The parameters of the newly formed cementitious composites were assessed, including strength features such as compressive strength, flexural strength, and split tensile strength. Additionally, the durability characteristics, such as water sorptivity and the Rapid Chloride Permeability Test (RCPT), were also analysed. The results shown that with in incorporation of LMS and WLP predominantly enhanced the properties of concrete. The CWLP15 mix reached 22% higher compressive and19.5% higher spilt tensile strength when compared to control mix at 28&#xa0;days. Also, the flexural strength shown 10% higher strength and in case of bond strength it was improved by 50% for CLS10 when compared to control mix. Durability performance was also improved, the chloride ion penetration was reduced by 78% for CLS10 mix when compared to control mix at 180&#xa0;days. These significant improvements not only show that the potential of these materials in improving concrete performance but also offer numerous practical benefits in real-time construction world with improved durability and reduced maintenance aligning with sustainable construction practices. This study establishes a strong scientific foundation for enhancing the effectiveness of LMS&#xa0;and WLP&#xa0;in concrete mixtures, focusing on boosting strength and durability. This improvement is achieved by using the appropriate quantities and curing times. This study shows that the partial cement replacements with LMS and WLP improve concrete strength, durability, and sustainability. The best combinations 10% LMS (CLMS10) and 15% WLP (CWLP15) improved compressive, flexural, and tensile strength and reduced absorption of water and chloride penetration. The denser, less permeable concrete improved bonding and durability, according to microstructural research. It also decreases the greenhouse gases and industrial waste, making it an eco-friendly concrete alternative. The significance of the research is to focus on long-term advantages using the supplementary materials experimented in this study. The results emphasise using these alternative materials, including decreased water permeability, structural strength, and lower carbon emissions, which contribute to the sustainable development. Nevertheless, it recognises the need of precise logistical planning and diligent sourcing to fully optimise the environmental effect of the construction industry.</p>

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Enhanced Concrete Performance and Sustainability with Lime Sludge and Wollastonite Powder: A Comprehensive Experimental Study

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Akula Venkata Phani Manoj,
  • K. Ravichandran,
  • Ganugula Taraka Naga Veerendra,
  • Subhashish Dey,
  • Siva Shanmukha Anjaneya Babu Padavala,
  • P. Kodanda Rama Rao

摘要

Cementitious composites are the predominant artificial material, accounting for a production volume of 25 billion tonnes and contributing to 5% of greenhouse gas emissions. Concrete composites emit a substantial amount of carbon dioxide into the atmosphere. Therefore, the replacement of concrete composite raw material is of utmost importance. The practice of using industrial by products like as lime sludge (LMS) and wollastonite powder (WLP) in cementitious composites is increasingly being used to minimise the carbon emissions of this sector. This approach tackles the management of industrial outputs in two distinct ways. The mechanical and durability properties of cementitious composite products with several components must be acknowledged. The primary objective of this research is to assess the mechanical strength and durability of binary blended concrete using LMS and WLP. The binary blended were produced using LMS (5%, 10%, 15% and 20%) and WLP (5%, 10%, 15% and 20%) binders. Environmental waste management has become a pressing issue. The parameters of the newly formed cementitious composites were assessed, including strength features such as compressive strength, flexural strength, and split tensile strength. Additionally, the durability characteristics, such as water sorptivity and the Rapid Chloride Permeability Test (RCPT), were also analysed. The results shown that with in incorporation of LMS and WLP predominantly enhanced the properties of concrete. The CWLP15 mix reached 22% higher compressive and19.5% higher spilt tensile strength when compared to control mix at 28 days. Also, the flexural strength shown 10% higher strength and in case of bond strength it was improved by 50% for CLS10 when compared to control mix. Durability performance was also improved, the chloride ion penetration was reduced by 78% for CLS10 mix when compared to control mix at 180 days. These significant improvements not only show that the potential of these materials in improving concrete performance but also offer numerous practical benefits in real-time construction world with improved durability and reduced maintenance aligning with sustainable construction practices. This study establishes a strong scientific foundation for enhancing the effectiveness of LMS and WLP in concrete mixtures, focusing on boosting strength and durability. This improvement is achieved by using the appropriate quantities and curing times. This study shows that the partial cement replacements with LMS and WLP improve concrete strength, durability, and sustainability. The best combinations 10% LMS (CLMS10) and 15% WLP (CWLP15) improved compressive, flexural, and tensile strength and reduced absorption of water and chloride penetration. The denser, less permeable concrete improved bonding and durability, according to microstructural research. It also decreases the greenhouse gases and industrial waste, making it an eco-friendly concrete alternative. The significance of the research is to focus on long-term advantages using the supplementary materials experimented in this study. The results emphasise using these alternative materials, including decreased water permeability, structural strength, and lower carbon emissions, which contribute to the sustainable development. Nevertheless, it recognises the need of precise logistical planning and diligent sourcing to fully optimise the environmental effect of the construction industry.