Scholarlink

<p>To mitigate the shortage of river sand and promote the reuse of construction waste, this study comprehensively evaluates the applicability of completely recycled fine aggregate (CRFA), produced by crushing concrete waste completely into fine aggregates, in structural concrete from the material to structural levels. Mechanical properties, durability, shrinkage, microstructure, and structural performance of recycled aggregate concrete (RAC) with CRFA as the sole fine aggregate were tested and compared to natural aggregate concrete (NAC) of the same strength grade. The results indicate that RAC exhibits comparable strength and elastic modulus to NAC at 28&#xa0;days, although its long-term compressive strength is 12% lower. RAC demonstrates superior freeze–thaw resistance but reduced resistance to carbonation and chloride ion penetration due to a higher percentage of large pores, as observed via mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM). RAC also shows lower early-age autogenous shrinkage but higher long-term drying shrinkage than NAC. Structural testing under bending, axial, and eccentric compression reveals that RAC performs similarly to NAC and can be conservatively predicted by current design codes for NAC, with the ratios between experimental and predicted values exceeding 1.08. Furthermore, with 18.8% and 10.5% reductions in cost and carbon emissions, respectively, CRFA is an economical and sustainable alternative to river sand in structural applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Experimental investigation of sustainable structural concrete incorporating completely recycled fine aggregate (CRFA): from material to structural levels

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月3日

查看全文
  • Yibo Yang,
  • Yi Zhang,
  • Baixi Chen,
  • Wen Yang,
  • Wenying Guo,
  • Hengchang Wang

摘要

To mitigate the shortage of river sand and promote the reuse of construction waste, this study comprehensively evaluates the applicability of completely recycled fine aggregate (CRFA), produced by crushing concrete waste completely into fine aggregates, in structural concrete from the material to structural levels. Mechanical properties, durability, shrinkage, microstructure, and structural performance of recycled aggregate concrete (RAC) with CRFA as the sole fine aggregate were tested and compared to natural aggregate concrete (NAC) of the same strength grade. The results indicate that RAC exhibits comparable strength and elastic modulus to NAC at 28 days, although its long-term compressive strength is 12% lower. RAC demonstrates superior freeze–thaw resistance but reduced resistance to carbonation and chloride ion penetration due to a higher percentage of large pores, as observed via mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM). RAC also shows lower early-age autogenous shrinkage but higher long-term drying shrinkage than NAC. Structural testing under bending, axial, and eccentric compression reveals that RAC performs similarly to NAC and can be conservatively predicted by current design codes for NAC, with the ratios between experimental and predicted values exceeding 1.08. Furthermore, with 18.8% and 10.5% reductions in cost and carbon emissions, respectively, CRFA is an economical and sustainable alternative to river sand in structural applications.