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<p>In this paper, Engineered Cementitious Composites were prepared by using recycled concrete fine aggregate instead of natural sand using Response Surface Method (RSM). Box-Behnken Design (BBD) was used to construct recycled fine aggregates engineered cementitious composites (ECC) by using different regenerated fine aggregates (RFA) replacement rate (<i>λ</i>), water-binder ratio (<i>w</i><sub>eff</sub>/<i>c</i>) and PE fiber volume content (<i>V</i><sub>PE</sub>). Based on the regression analysis of the above three indices, the RFA-ECC mix ratio design was optimized, and a systematic RFA-ECC mix ratio design method was proposed. At the same time, RFA was modified using a solution containing Na₂O·nSiO₂, HCl, and SiH₄. The results show that <i>λ</i> is the main factor affecting the mechanical properties of RFA-ECC, followed by <i>w</i><sub>eff</sub>/<i>c</i>, and <i>V</i><sub>PE</sub> is the least. When <i>λ</i> is 50%, <i>w</i><sub>eff</sub>/<i>c</i> is 0.28, <i>V</i><sub>PE</sub> is 2%, the specimens have good mechanical properties. The modification results show that Na<sub>2</sub>O·nSiO<sub>2</sub> has the most obvious strengthening effect on RFA, followed by HCl, and the effect of SiH<sub>4</sub> is relatively general. The microscopic analysis results showed that the presence of RAF did not change the properties of the bonding interface between fiber and matrix.</p>

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Design and modification of engineered cement composite materials for regenerated fine aggregate preparation based on response surface methodology

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Longxin Li,
  • Gangbo Quan,
  • Qichang Fan,
  • Dan Meng,
  • Chongji Zhu,
  • Lingqiang Yang

摘要

In this paper, Engineered Cementitious Composites were prepared by using recycled concrete fine aggregate instead of natural sand using Response Surface Method (RSM). Box-Behnken Design (BBD) was used to construct recycled fine aggregates engineered cementitious composites (ECC) by using different regenerated fine aggregates (RFA) replacement rate (λ), water-binder ratio (weff/c) and PE fiber volume content (VPE). Based on the regression analysis of the above three indices, the RFA-ECC mix ratio design was optimized, and a systematic RFA-ECC mix ratio design method was proposed. At the same time, RFA was modified using a solution containing Na₂O·nSiO₂, HCl, and SiH₄. The results show that λ is the main factor affecting the mechanical properties of RFA-ECC, followed by weff/c, and VPE is the least. When λ is 50%, weff/c is 0.28, VPE is 2%, the specimens have good mechanical properties. The modification results show that Na2O·nSiO2 has the most obvious strengthening effect on RFA, followed by HCl, and the effect of SiH4 is relatively general. The microscopic analysis results showed that the presence of RAF did not change the properties of the bonding interface between fiber and matrix.