ENGINEERING PROPERTIES OF BLACK COTTON SOIL STABILIZED WITH COFFEE HUSK ASH AND LIME

Autor: Meskerem K. Atahu, Fokke Saathoff, Alemayehu Gebissa
In:

Global Journal of Engineering Science and Research Management

Auflage: Januar
ISBN: 2349-4506
DOI: 10.5281/zenodo.3625617
Seite: 20 - 38
Jahr: 2020

Einordung:
Institut: Professur Geotechnik und Küstenwasserbau

Abstract:
Nowadays, the utilization of locally available waste materials for the improvement of poor soil properties is adapted in the stabilization method. In this study, coffee husk ash (CHA) is used as an admixture to improve the properties of black cotton (BC) soil for use as a road sub-grade. In order to assess the properties of an expansive soil admixed with different percentages of lime and CHA for each lime content, standard proctor compaction, Atterberg limits and California bearing ratio (CBR) tests were performed. Microanalysis and elemental analysis were conducted using scanning electron microscopy (SEM). The laboratory test results demonstrated that expansive soil stabilized with lime and CHA mixture is more effective than lime-stabilized soil by reducing the plasticity index and improving bearing capacity.Adding CHA to lime-stabilized soil increases the bearing capacity (the addition of 15% CHA to soil stabilized with 6% lime increased the CBR by 19.5%). In addition, CHA-stabilized soil has less swelling and shrinkage. From the elemental analysis, it was observed that the concentration of calcium increased for increased CHA content. In addition, X-ray diffraction (XRD) reveals that the appearance of cementitious product on both CHA and lime-treated samples, which majorly contributed to the improvement of the geotechnical properties of the BC soil.

Ansprechpartner

Weitere Information im WWW

Zur Publikation: Mitarbeiter, Projekte
Weitere Publikationen im Forschungsteilschwerpunkt