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<p>This study addressed the issue of severe bleeding in manufactured mortar during engineering applications by proposing a technical approach that, different from traditional additive control methods, partially replaced 0.6–4.75&#xa0;mm manufactured sand with recycled fine aggregate (RFA) produced from construction solid waste. By setting three RFA replacement rates of 10%, 15%, and 20%, the study systematically tested the physical properties of the recycled mixed sand, including particle morphology and water absorption rate, as well as the workability and mechanical properties of the recycled mixed mortar, with aggregate collision probability analysis revealing the underlying influence mechanism. The test results indicated that as the RFA replacement rate increased, the particle morphology deteriorated, manifested by a notable increase in specific surface area, water absorption rate and crushing index. Although the fluidity of the recycled mixed mortar decreased considerably, its bleeding resistance was substantially enhanced. At a 15% replacement rate, the mortar fluidity only decreased by 7.7%, while the stratification significantly reduced by 21.1%, with acceptable mechanical properties. When the replacement rate reached 20%, the stratification decreased by 42.1%, but the negative impact on fluidity became pronounced, and the mechanical properties deteriorated drastically. The variation in collision probability between different aggregate types is one of the key factors contributing to the decrease in mortar fluidity. Partial replacement of manufactured sand with RFA significantly mitigated bleeding issues while maintaining good mechanical properties, preliminarily verifying technical feasibility. This provided an effective approach to improve the recycling rate of construction solid waste.</p>

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Effects of morphological and physical properties of recycled fine aggregate on the workability of manufactured mortar

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Lei Wang,
  • Yibo Li,
  • Xuelian Deng,
  • Xiangjian Peng,
  • Xuan Chen

摘要

This study addressed the issue of severe bleeding in manufactured mortar during engineering applications by proposing a technical approach that, different from traditional additive control methods, partially replaced 0.6–4.75 mm manufactured sand with recycled fine aggregate (RFA) produced from construction solid waste. By setting three RFA replacement rates of 10%, 15%, and 20%, the study systematically tested the physical properties of the recycled mixed sand, including particle morphology and water absorption rate, as well as the workability and mechanical properties of the recycled mixed mortar, with aggregate collision probability analysis revealing the underlying influence mechanism. The test results indicated that as the RFA replacement rate increased, the particle morphology deteriorated, manifested by a notable increase in specific surface area, water absorption rate and crushing index. Although the fluidity of the recycled mixed mortar decreased considerably, its bleeding resistance was substantially enhanced. At a 15% replacement rate, the mortar fluidity only decreased by 7.7%, while the stratification significantly reduced by 21.1%, with acceptable mechanical properties. When the replacement rate reached 20%, the stratification decreased by 42.1%, but the negative impact on fluidity became pronounced, and the mechanical properties deteriorated drastically. The variation in collision probability between different aggregate types is one of the key factors contributing to the decrease in mortar fluidity. Partial replacement of manufactured sand with RFA significantly mitigated bleeding issues while maintaining good mechanical properties, preliminarily verifying technical feasibility. This provided an effective approach to improve the recycling rate of construction solid waste.