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<p>This paper provides an innovative approach to improve the strength and durability of cement-treated base (CTB) incorporating Full-Depth Reclamation (FDR) techniques with the addition of chemical stabilizers namely Terraisill (T) and ZycoBond (Z). The main aim of this study is to improve strength and durability and reduce shrinkage and fatigue cracking shortly after construction. Aspects related to durability, flexural strength, compressive strength, and microstructural behavior are analyzed by adding varying amounts of these stabilizers (T &amp; Z) and cement (C). Results indicate that chemical stabilizers significantly enhance the mechanical properties of the FDR mixtures, with optimal performance achieved at a mix of 4%C + 2%T + 2%Z. This combination increased UCS values during the 28-day curing period. It demonstrated superior durability performances, with an average weight loss reduction of 35.5% and 80.8% respectively in wetting-dry and freeze-thaw tests compared to conventional mixes. Microstructural analyses confirmed the presence of calcium silicate hydrate (CSH) gel, which contributes to improved material cohesion and strength. The regression analysis further validated the positive influence of cement and chemical stabilizers on UCS and durability outcomes. The findings highlight the potentiality of integrating chemical stabilizers into a cement-modified base layer to develop sustainable, cost-effective, and resilient pavement materials by ensuring a strong and crack-resisting base layer.</p>

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Utilization of Chemical Stabilizers in Recycled Asphalt Pavement (RAP) Materials Derived from Full Depth Reclamation (FDR) for Enhancing Pavement Layers

  • 期刊论文

  • 发表日期：

    2025年3月21日

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  • Robel Tewelde Mesfun,
  • Supriya Marik,
  • G.D. Ransinchung R.N.

摘要

This paper provides an innovative approach to improve the strength and durability of cement-treated base (CTB) incorporating Full-Depth Reclamation (FDR) techniques with the addition of chemical stabilizers namely Terraisill (T) and ZycoBond (Z). The main aim of this study is to improve strength and durability and reduce shrinkage and fatigue cracking shortly after construction. Aspects related to durability, flexural strength, compressive strength, and microstructural behavior are analyzed by adding varying amounts of these stabilizers (T & Z) and cement (C). Results indicate that chemical stabilizers significantly enhance the mechanical properties of the FDR mixtures, with optimal performance achieved at a mix of 4%C + 2%T + 2%Z. This combination increased UCS values during the 28-day curing period. It demonstrated superior durability performances, with an average weight loss reduction of 35.5% and 80.8% respectively in wetting-dry and freeze-thaw tests compared to conventional mixes. Microstructural analyses confirmed the presence of calcium silicate hydrate (CSH) gel, which contributes to improved material cohesion and strength. The regression analysis further validated the positive influence of cement and chemical stabilizers on UCS and durability outcomes. The findings highlight the potentiality of integrating chemical stabilizers into a cement-modified base layer to develop sustainable, cost-effective, and resilient pavement materials by ensuring a strong and crack-resisting base layer.