Influence of Water Treatment Sludge Addition on the Compressibility and Shear Strength Parameters of Two Lateritic Soils

Author(s)

Montalvan, Edy L. T. ; Ferreira, Kemmylle S. M. ; Godoy, Rafaela V. S. ; Boscov, Maria E. G. ; LopezAcosta, NP ; MartinezHernandez, E ; EspinosaSantiago, AL ; MendozaPromotor, JA ; Lopez, AO

• Document type: Journal article
• Source: GEOTECHNICAL ENGINEERING IN THE XXI CENTURY: LESSONS LEARNED AND FUTURE CHALLENGES; v. N/A, p. 9-pg., 2019-01-01.

Abstract

This article analyzes the influence of the addition of water treatment sludge (WTS) on the compressibility and shear strength parameters of two Brazilian lateritic soils (a clayey sand and a clay) in order to enable the waste reuse at geotechnical works. The lateritic soils, the WTS and the mixtures were geotechnically characterized and subjected to compaction, one-dimensional consolidation and undrained triaxial compression tests. WTS addition altered the compaction parameters of the soils by decreasing the maximum dry unit weight and increasing the optimum water content. The mixtures presented higher values of compression indexes than the soils, and correlations are presented relating compression index to WTS content. The effective cohesion decreased with WTS addition and the effective friction angle increased. Nevertheless, some the obtained values for compressibility and shear strength parameters can still be allowable for earthworks, depending on the structure requirements. (AU)

• FAPESP's process: 17/24056-6 - Geotechnical behavior of mixtures of tropical soils and water treatment sludge
• Grantee: Edy Lenin Tejeda Montalvan
• Support Opportunities: Scholarships in Brazil - Doctorate