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<p>We optimized the gradation of cold recycled mixture (CRM) based on low-temperature performance. Firstly, the low-temperature crack resistance of CRM with different gradation and emulsified asphalt content was studied by indirect tension (IDT) and semi-circular bending (SCB) test. Thereafter, the low-temperature performance evaluation index suitable for CRM was put forward. Then, the triangular coordinate statistical chart was used to analyze the optimal proportion of three grades of aggregate which are 2.36 – 4.75 mm, 0.075 – 2.36 mm and below 0.075 mm. The results showed that the <i>W</i><sub>f</sub> and <i>G</i><sub>f</sub> could distinguish the low-temperature performance of CRM with different mixtures and emulsified asphalt dosage. For cold recycled fine aggregate, 2.36 – 4.75 mm, 0.075 – 2.36 mm and less than 0.075 mm account for 20% – 25%, 74.3% – 80% and 5% – 8%, respectively. The CRM with lower void fraction, higher <i>W</i><sub>f</sub> and <i>G</i><sub>f</sub> could be obtained. Based on the reported findings, it was suggested that the sieve passing percentage of 4.75, 2.36, and 0.075 mm of CRM is 45% – 55%, 27% – 52% and 1.5% – 5%, respectively.</p>

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Grading Optimization of Cold Recycled Mixtures Based on Low-temperature Performance

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Dan Lei,
  • Zhanchuang Han,
  • Liping Liu,
  • Lijun Sun,
  • Mingchen Li

摘要

We optimized the gradation of cold recycled mixture (CRM) based on low-temperature performance. Firstly, the low-temperature crack resistance of CRM with different gradation and emulsified asphalt content was studied by indirect tension (IDT) and semi-circular bending (SCB) test. Thereafter, the low-temperature performance evaluation index suitable for CRM was put forward. Then, the triangular coordinate statistical chart was used to analyze the optimal proportion of three grades of aggregate which are 2.36 – 4.75 mm, 0.075 – 2.36 mm and below 0.075 mm. The results showed that the Wf and Gf could distinguish the low-temperature performance of CRM with different mixtures and emulsified asphalt dosage. For cold recycled fine aggregate, 2.36 – 4.75 mm, 0.075 – 2.36 mm and less than 0.075 mm account for 20% – 25%, 74.3% – 80% and 5% – 8%, respectively. The CRM with lower void fraction, higher Wf and Gf could be obtained. Based on the reported findings, it was suggested that the sieve passing percentage of 4.75, 2.36, and 0.075 mm of CRM is 45% – 55%, 27% – 52% and 1.5% – 5%, respectively.