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<p>Biopolymers are being explored as environmentally friendly alternatives and supplements to traditional roadway subbase stabilizers such as cement. This study investigated the effects of Xanthan Gum (XG) biopolymer on the strength and stiffness of roadway subbase materials as a full or partial replacement of cement. The subbase material was created in the lab and designed to represent the general gradation specified by regional departments of transportation. Scanning electron microscope imagery indicated that the XG coats soil particles and creates connections between them. For specimens treated with only XG, the results indicated an optimal treatment level of 1.0% of the dry mass of the subbase material, resulting in an unconfined compressive strength of about 4,000&#xa0;kPa for specimens cured for 28&#xa0;days compared to the untreated specimen with a strength of about 200&#xa0;kPa. The compressive strength at different treatment levels was found to be dependent on the moisture content at the time of testing, with strength decreasing with increased moisture contents. For specimens treated with both XG and cement, the results indicated an optimal level of treatment of 1.0% XG and 1.0% cement by dry mass of the subbase material. This combination demonstrated increased compressive strength of about 1,400&#xa0;kPa. Combinations of XG and cement also resulted in a desirable ductile post-peak behavior in the treated subbase specimens compared to specimens treated with cement alone, which often produces undesirable brittle behavior.</p>

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Investigating the Use of Xanthan Gum in Roadway Subbase Stabilization

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • Ryan van der Heijden,
  • Bijay K C,
  • Mandar Dewoolkar,
  • Ehsan Ghazanfari,
  • Donna M. Rizzo

摘要

Biopolymers are being explored as environmentally friendly alternatives and supplements to traditional roadway subbase stabilizers such as cement. This study investigated the effects of Xanthan Gum (XG) biopolymer on the strength and stiffness of roadway subbase materials as a full or partial replacement of cement. The subbase material was created in the lab and designed to represent the general gradation specified by regional departments of transportation. Scanning electron microscope imagery indicated that the XG coats soil particles and creates connections between them. For specimens treated with only XG, the results indicated an optimal treatment level of 1.0% of the dry mass of the subbase material, resulting in an unconfined compressive strength of about 4,000 kPa for specimens cured for 28 days compared to the untreated specimen with a strength of about 200 kPa. The compressive strength at different treatment levels was found to be dependent on the moisture content at the time of testing, with strength decreasing with increased moisture contents. For specimens treated with both XG and cement, the results indicated an optimal level of treatment of 1.0% XG and 1.0% cement by dry mass of the subbase material. This combination demonstrated increased compressive strength of about 1,400 kPa. Combinations of XG and cement also resulted in a desirable ductile post-peak behavior in the treated subbase specimens compared to specimens treated with cement alone, which often produces undesirable brittle behavior.