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102 - INFLUÊNCIA DO LICOR NEGRO KRAFT E DO CIMENTO CP II-F-32 NA RESISTÊNCIA À COMPRESSÃO DE UM SOLO ARGILOSO COMPACTADO

Doi: 10.47094/COBRAMSEG2026.6/102

PALAVRAS CHAVE: Licor negro kraft, Resistência à compressão não confinada, Estabilização química de solo, Compactação, Materiais de barreira.

KEYWORDS: Kraft black liquor, Unconfined compressive strength, Chemical soil stabilization, Compaction, Barrier materials.

ABSTRACT:
Compacted soils are widely used as barriers in waste disposal systems. However, their mechanical performance may be affected by variations in moisture and loading conditions. This study evaluated the effect of adding kraft black liquor and CP II-F-32 cement on the unconfined compressive strength of a compacted clayey soil, considering different molding and curing conditions. The mixtures were prepared by incorporating black liquor into the compaction water (100 and 200 mgNa/kg of dry soil), with and without 2% cement, and molded at degrees of compaction ranging from 95% to 100%. Specimens were cured for 7 and 28 days. The results showed a significant increase in strength with the addition of black liquor, particularly at 100 mgNa and when combined with cement. In the dry side of the compaction curve at 100% degree of compaction, the mixture containing 100 mgNa reached 498 and 598 kPa at 7 and 28 days, respectively, whereas the black liquor-cement combination achieved 553 and 692 kPa. Reductions in the degree of compaction led to proportional decreases in strength, although the mixtures consistently outperformed the compacted soil. The mechanical improvement was associated with increases in maximum dry unit weight and reductions in optimum moisture content, related to Na+ induced clay dispersion and microstructural rearrangement, partially mitigated by Ca2+ from cement. Mechanical response showed direct dependence on molding moisture and degree of compaction.

Autores

  • Bruno Pereira de Queiroz

  • Rejane Nascentes

  • Roberto Lopes Ferraz

  • Yuri Marques Portella

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