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<p>Incorporation of reclaimed asphalt pavement (RAP) material in cement grouted bituminous mixes (CGBM) offers environmental and economic benefits; however, the presence of aged RAP binder increases mixture stiffness, potentially affecting mix performance. This study evaluates the effectiveness of using styrene-butadiene latex as a grout modifier to improve the binder-grout adhesion and performance of CGBM containing RAP material. Three RAP incorporation levels (0, 20, and 50%) were investigated using latex-modified and unmodified cement grouts. Surface free energy characteristics was examined to quantify the interfacial adhesion, and CGBM-RAP mixes were evaluated for rutting, fatigue, abrasion, moisture damage, and fuel resistance. Results indicate that latex modification significantly enhanced compressive and flexural strength, increased grout cohesion, and improved binder-grout adhesion. Latex-modified CGBM exhibited superior fatigue, abrasion, and fuel resistance, particularly at 50% RAP content, without compromising rutting or moisture damage resistance. In addition, high RAP incorporation reduced material costs by up to 16%. Overall, latex-modified CGBM with 50% RAP demonstrated the best performance, indicating that styrene-butadiene latex effectively improves the flexibility and durability of CGBM particularly at higher RAP contents, thereby mitigating the stiffening effects of aged RAP binder.</p>

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Latex synergy for sustainable pavements: role of styrene-butadiene latex in RAP incorporated cement-grouted bituminous mixes for semi-flexible pavements

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Bhuvana Priya Dhandapani,
  • J. Nithinchary,
  • Ramya Sri Mullapudi

摘要

Incorporation of reclaimed asphalt pavement (RAP) material in cement grouted bituminous mixes (CGBM) offers environmental and economic benefits; however, the presence of aged RAP binder increases mixture stiffness, potentially affecting mix performance. This study evaluates the effectiveness of using styrene-butadiene latex as a grout modifier to improve the binder-grout adhesion and performance of CGBM containing RAP material. Three RAP incorporation levels (0, 20, and 50%) were investigated using latex-modified and unmodified cement grouts. Surface free energy characteristics was examined to quantify the interfacial adhesion, and CGBM-RAP mixes were evaluated for rutting, fatigue, abrasion, moisture damage, and fuel resistance. Results indicate that latex modification significantly enhanced compressive and flexural strength, increased grout cohesion, and improved binder-grout adhesion. Latex-modified CGBM exhibited superior fatigue, abrasion, and fuel resistance, particularly at 50% RAP content, without compromising rutting or moisture damage resistance. In addition, high RAP incorporation reduced material costs by up to 16%. Overall, latex-modified CGBM with 50% RAP demonstrated the best performance, indicating that styrene-butadiene latex effectively improves the flexibility and durability of CGBM particularly at higher RAP contents, thereby mitigating the stiffening effects of aged RAP binder.