Scholarlink

<p>The southern coastal plains of Brazil often present dispersive soils, which compromise the stability of geotechnical works through internal and superficial erosion. These materials are characterized by deflocculation in the presence of relatively pure and static water, a property observed in sodic clays where sodium cations (Na<sup>+</sup>) are weakly charged, resulting in a system with low levels of attractive forces between clay mineral particles. In recent decades, soil improvement efforts have increasingly sought to replace synthetic industrial materials with biologically based, biodegradable, and reusable by-products. In this context, various researchers have employed calcium lignosulfonate (LS), a biologically-based polymer obtained as a by-product of the paper industry. Accordingly, this study investigates the use of calcium LS, a biodegradable industrial by-product, for stabilizing a highly dispersive sodic clay from southern Brazil. Laboratory tests were conducted to evaluate the effects of LS content, dry unit weight, and curing time on unconfined compressive strength (UCS), initial shear stiffness (G₀), dispersibility, and durability. Specimens were prepared with LS dosages of 1%, 2%, and 3%, compacted at three energy levels, and cured for 7 and 28&#xa0;days. The results demonstrated that 3% LS, combined with a dry unit weight of 16.8&#xa0;kN/m<sup>3</sup> and 28&#xa0;days of curing, produced optimal performance: the UCS increased by up to 45%, dispersibility was nearly eliminated, and specimens resisted up to five wetting–drying cycles without structural failure. SEM and XRD analyses revealed enhanced particle aggregation and denser microstructure due to electrostatic neutralization and cation exchange mechanisms.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Stabilization of Dispersive Soil Using Calcium Lignosulfonate: Strength, Durability, and Microstructure Assessment

  • 期刊论文

  • 发表日期：

    2025年8月21日

查看全文
  • Lisandra Rocha de Moraes,
  • Nilo Cesar Consoli,
  • Cezar Augusto Burkert Bastos

摘要

The southern coastal plains of Brazil often present dispersive soils, which compromise the stability of geotechnical works through internal and superficial erosion. These materials are characterized by deflocculation in the presence of relatively pure and static water, a property observed in sodic clays where sodium cations (Na+) are weakly charged, resulting in a system with low levels of attractive forces between clay mineral particles. In recent decades, soil improvement efforts have increasingly sought to replace synthetic industrial materials with biologically based, biodegradable, and reusable by-products. In this context, various researchers have employed calcium lignosulfonate (LS), a biologically-based polymer obtained as a by-product of the paper industry. Accordingly, this study investigates the use of calcium LS, a biodegradable industrial by-product, for stabilizing a highly dispersive sodic clay from southern Brazil. Laboratory tests were conducted to evaluate the effects of LS content, dry unit weight, and curing time on unconfined compressive strength (UCS), initial shear stiffness (G₀), dispersibility, and durability. Specimens were prepared with LS dosages of 1%, 2%, and 3%, compacted at three energy levels, and cured for 7 and 28 days. The results demonstrated that 3% LS, combined with a dry unit weight of 16.8 kN/m3 and 28 days of curing, produced optimal performance: the UCS increased by up to 45%, dispersibility was nearly eliminated, and specimens resisted up to five wetting–drying cycles without structural failure. SEM and XRD analyses revealed enhanced particle aggregation and denser microstructure due to electrostatic neutralization and cation exchange mechanisms.