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<p>Elevated temperatures in urban centres compared to nearby rural areas, driven by increased pavement surface temperatures from rapid, unregulated urban growth have led to many harmful environmental impacts which affects life and human comfort. This research examines the use of lime as an addition in modified concrete mixes, assessing its impact on mechanical strength, thermal regulation, and flexural performance. Experimental findings indicated that lime, when proportioned appropriately, markedly enhances compressive, split tensile, and flexural strengths. A blend of lime with a 30% substitution of fine particles using steel slag resulted in significant improvements in concrete quality; however, increased slag content negatively impacted workability. Lime also facilitated surface temperature decreases of up to 5%, indicating its potential for alleviating urban heat island impacts. Economic investigation demonstrated cost reductions of 4% to 8% when lime was utilised in conjunction with steel slag and plastic aggregates, underscoring its potential as a sustainable resource. The flexural performance demonstrated enhanced load-bearing capacity and structural stiffness in optimised blends. The findings highlight lime’s efficacy as a sustainable component in concrete manufacturing, promoting more study into mix optimisation and long-term durability for wider implementation in ecologically responsible building.</p>

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Modified concrete with recycled materials for surface temperature reduction in urban environments

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Pradeep Kuhar,
  • Amardeep Boora

摘要

Elevated temperatures in urban centres compared to nearby rural areas, driven by increased pavement surface temperatures from rapid, unregulated urban growth have led to many harmful environmental impacts which affects life and human comfort. This research examines the use of lime as an addition in modified concrete mixes, assessing its impact on mechanical strength, thermal regulation, and flexural performance. Experimental findings indicated that lime, when proportioned appropriately, markedly enhances compressive, split tensile, and flexural strengths. A blend of lime with a 30% substitution of fine particles using steel slag resulted in significant improvements in concrete quality; however, increased slag content negatively impacted workability. Lime also facilitated surface temperature decreases of up to 5%, indicating its potential for alleviating urban heat island impacts. Economic investigation demonstrated cost reductions of 4% to 8% when lime was utilised in conjunction with steel slag and plastic aggregates, underscoring its potential as a sustainable resource. The flexural performance demonstrated enhanced load-bearing capacity and structural stiffness in optimised blends. The findings highlight lime’s efficacy as a sustainable component in concrete manufacturing, promoting more study into mix optimisation and long-term durability for wider implementation in ecologically responsible building.