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<p>Rigid concrete pavements are sensitive to thermally driven movements, for which the coefficient of thermal expansion (CTE) is a key parameter. This study compares Portland cement concrete (PCC) and macro-synthetic-fiber-reinforced concrete (MSFRC; 6&#xa0;kg/m<sup>3</sup>) under controlled laboratory conditions, reporting fresh-state properties, compressive strength, and measured CTE (ASTM C531). Variance homogeneity was checked with F-tests, and group differences were evaluated with two-sample Student’s t-tests (α = 0.05). Relative to PCC, MSFRC showed lower slump (113→82&#xa0;mm; − 27%; <i>p</i> &lt; 0.001), a small, non-significant change in air content (1.7%→1.9%; <i>p</i> = 0.204), and slightly lower fresh density (2386→2312&#xa0;kg/m<sup>3</sup>; − 3.1%; <i>p</i> = 0.013). At 28 days, the compressive strength changed from 34.6 to 33.2&#xa0;MPa (− 4%; <i>p</i> &gt; 0.05 across ages), indicating no statistically significant loss of strength under the tested conditions. The measured CTE decreased from 11.45 to 5.62 µε/°C (− 50.9%; <i>p</i> = 0.003). These quantitative results show that, in this experimental setup, MSFRC exhibits a substantially lower CTE while maintaining comparable compressive strength, with documented effects on workability and density.</p>

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Mitigating thermal expansion in rigid pavements using macro synthetic fibers

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Ahmed M. Youssef,
  • Hager Elmahdy,
  • Mahmoud Gobara,
  • Mohammed S. Eisa

摘要

Rigid concrete pavements are sensitive to thermally driven movements, for which the coefficient of thermal expansion (CTE) is a key parameter. This study compares Portland cement concrete (PCC) and macro-synthetic-fiber-reinforced concrete (MSFRC; 6 kg/m3) under controlled laboratory conditions, reporting fresh-state properties, compressive strength, and measured CTE (ASTM C531). Variance homogeneity was checked with F-tests, and group differences were evaluated with two-sample Student’s t-tests (α = 0.05). Relative to PCC, MSFRC showed lower slump (113→82 mm; − 27%; p < 0.001), a small, non-significant change in air content (1.7%→1.9%; p = 0.204), and slightly lower fresh density (2386→2312 kg/m3; − 3.1%; p = 0.013). At 28 days, the compressive strength changed from 34.6 to 33.2 MPa (− 4%; p > 0.05 across ages), indicating no statistically significant loss of strength under the tested conditions. The measured CTE decreased from 11.45 to 5.62 µε/°C (− 50.9%; p = 0.003). These quantitative results show that, in this experimental setup, MSFRC exhibits a substantially lower CTE while maintaining comparable compressive strength, with documented effects on workability and density.