Fines Content and Cohesion of Lateritic Soils: Conceptual Models | Chapter 01 | Advances in Applied Science and Technology Vol. 5

Laterite has been widely defined  as  a highly weathered material, rich  in  secondary oxides  of iron, aluminium, or both. It is void or nearly void of basic primary silicates, but it may contain large amounts of quartz and kaolinite. A distinctive feature of laterite and lateritic soils is the higher proportion of sesquioxides of iron and/or aluminium relative to the other chemical components. This study proposed conceptual models for the determination of soil cohesion based on the correlations of soil cohesion with fines  content.  This was with a  view to contributing to timely,  less laborious and cost  effective determination of cohesion of lateritic soils. Selected lateritic soil samples were subjected to laboratory analyses. The fines were separated from the coarse component of the soils after which the samples were remoulded in varying ratios (fines: coarse) from 10:90 to 100:0 in 10% increment. The samples were  then  subjected  to  an  unconsolidated-undrained  triaxial  test  to  determine  the  shear  strength parameters. Quantitative relationships between fines content and cohesion of the soil samples were developed. It was found that the cohesion of the soil samples generally increased with an increase in fines  content;  the  polynomial  relationships  gave  the  best  fitting  between  the  fines  content  and cohesion of the soil samples. From the findings of this research work, thefollowing conclusions are made  in  relation  to  the  objectives  of  the  research:  (i)  The  cohesion  of  the  studied  soil  samples generally increased with an increase in fines content; (ii) the best fitting between the fines content and cohesion of the soil samples. The results are valid within the study area, the tested materials and the procedure  outlined  in  this  paper.  It  is  recommended  to  perform  more  experiments  to  validate  the finding in this research.

Author(s) Details


Lecturer at the Department of Civil Engineering, Faculty of Technology, Obafemi Awolowo University, Ile-Ife, Nigeria

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