Scholarlink

<p>We investigated the effects of fly ash (FA) content on the mechanical properties of recycled aggregate concrete (RAC) and its regeneration potential under freeze and thaw (F-T) cycles. The physical properties of second-generation recycled concrete aggregates (RCA) were used to analyze the regeneration potential of RAC after F-T cycles. Scanning electron microscopy was used to study the interfacial transition zone microstructure of RAC after F-T cycles. Results showed that adding 20% FA to RAC significantly enhanced its mechanical properties and frost resistance. Before the F-T cycles, the compressive strength of RAC with 20% FA reached 48.3 MPa, exceeding research strength target of 40 MPa. A majority of second-generation RCA with FA had been verified to attain class III, which enabled their practical application in non-structural projects such as backfill trenches and road pavement. However, the second-generation RCA with 20% FA can achieve class II, making it ideal for 40 MPa structural concrete.</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

Effect of Fly Ash on Frost Resistance and Regeneration of Recycled Aggregate Concrete

  • 期刊论文

  • 发表日期：

    2026年1月6日

查看全文
  • Pinghua Zhu,
  • Bihoza Christian,
  • Xintong Chen,
  • Xingjie Wang,
  • Hui Liu,
  • Xiancui Yan

摘要

We investigated the effects of fly ash (FA) content on the mechanical properties of recycled aggregate concrete (RAC) and its regeneration potential under freeze and thaw (F-T) cycles. The physical properties of second-generation recycled concrete aggregates (RCA) were used to analyze the regeneration potential of RAC after F-T cycles. Scanning electron microscopy was used to study the interfacial transition zone microstructure of RAC after F-T cycles. Results showed that adding 20% FA to RAC significantly enhanced its mechanical properties and frost resistance. Before the F-T cycles, the compressive strength of RAC with 20% FA reached 48.3 MPa, exceeding research strength target of 40 MPa. A majority of second-generation RCA with FA had been verified to attain class III, which enabled their practical application in non-structural projects such as backfill trenches and road pavement. However, the second-generation RCA with 20% FA can achieve class II, making it ideal for 40 MPa structural concrete.