Scholarlink

<p>Recycled aggregate concrete (RAC) suffers from significantly inadequate mechanical properties and durability due to the high porosity and weak interface transition zone (ITZ) of RCA, severely limiting its engineering applications. To address this issue, this study systematically investigates the coupled effects of basalt fiber (BF) dosage (volume fractions of 0.05%, 0.1%, 0.2%, and 0.3%) and RCA replacement rate (volume fractions of 40%, 60%, 80%, and 100%) on the performance of basalt fiber-reinforced recycled aggregate concrete (BFRAC). Results indicate that, regarding mechanical properties, considering combined splitting tensile, flexural, and compressive strengths, 0.2% BF reinforcement yields optimal performance. Compared to C40 concrete, splitting tensile strength increases by 29.7%, flexural strength by 15.1%, and compressive strength by 24.8% with compressive strength peaking at 88.06&#xa0;MPa at 0.05% BF content. Overall mechanical performance remained optimal at 0.2% BF. 2. For durability, 0.1% BF demonstrated the best improvement, reducing chloride ion permeability by 83% and sulfate erosion-induced strength loss by 8.99%. 3. When the RCA replacement rate increased to 100%, the BFRAC compressive strength decreased by up to 27.4%, and the chloride ion diffusion increased by 72%. However, the synergistic effect of 40% RCA combined with 0.1–0.2% BF enabled BFRAC’s comprehensive performance to approach that of ordinary concrete. This study quantifies the relationships between BF dosage, RCA replacement rate, and BFRAC’s macroscopic properties. It provides a reliable scientific basis for optimizing BFRAC mix designs and scaling up its application in civil engineering, holding significant implications for advancing sustainable development in the construction industry.</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

Mechanical and durability properties of basalt fiber-reinforced recycled aggregate concrete: effects of fiber content and aggregate replacement ratio

  • 期刊论文

  • 发表日期：

    2026年2月16日

查看全文
  • Dehong Wang,
  • Kehan Liu,
  • Pang Chen

摘要

Recycled aggregate concrete (RAC) suffers from significantly inadequate mechanical properties and durability due to the high porosity and weak interface transition zone (ITZ) of RCA, severely limiting its engineering applications. To address this issue, this study systematically investigates the coupled effects of basalt fiber (BF) dosage (volume fractions of 0.05%, 0.1%, 0.2%, and 0.3%) and RCA replacement rate (volume fractions of 40%, 60%, 80%, and 100%) on the performance of basalt fiber-reinforced recycled aggregate concrete (BFRAC). Results indicate that, regarding mechanical properties, considering combined splitting tensile, flexural, and compressive strengths, 0.2% BF reinforcement yields optimal performance. Compared to C40 concrete, splitting tensile strength increases by 29.7%, flexural strength by 15.1%, and compressive strength by 24.8% with compressive strength peaking at 88.06 MPa at 0.05% BF content. Overall mechanical performance remained optimal at 0.2% BF. 2. For durability, 0.1% BF demonstrated the best improvement, reducing chloride ion permeability by 83% and sulfate erosion-induced strength loss by 8.99%. 3. When the RCA replacement rate increased to 100%, the BFRAC compressive strength decreased by up to 27.4%, and the chloride ion diffusion increased by 72%. However, the synergistic effect of 40% RCA combined with 0.1–0.2% BF enabled BFRAC’s comprehensive performance to approach that of ordinary concrete. This study quantifies the relationships between BF dosage, RCA replacement rate, and BFRAC’s macroscopic properties. It provides a reliable scientific basis for optimizing BFRAC mix designs and scaling up its application in civil engineering, holding significant implications for advancing sustainable development in the construction industry.