Evaluation of the Effect of Lime Content on the California Bearing Ratio of Silty Soils: Case of Fombap District

Willy Chance Guimezap Kenou,Jules Hermann Keyangue Tchouata,Vladimir Willianov Keubou Tatapzia,François Ngapgue,Walter Jovic Kenou Jogo

doi:10.4236/ojg.2020.1011051

Willy Chance Guimezap Kenou, Jules Hermann Keyangue Tchouata + Show 3 more

Open Access

https://doi.org/10.4236/ojg.2020.1011051

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Abstract

The present study is inscribed within the framework of the amelioration of the soils of the Santchou plain for employment as pavement subgrade. The bearing capacity proposed by these soils at their respective optimum dry densities is relatively small, although most of these experimental California Bearing Ratio (CBR) values of the studied soils are more important than the ones prescribed by the American Association of State Highway and Transportation Officials Classification system (AASHTO) for A5, A6, and A7 types. The stabilization of this soils with lime has been chosen to improve the bearing capacity and by association, their resilient modulus. The results of this study show that the increase of lime content is not proportional with the increase of the expected mechanical performances. In fact, the literature explains that when the lime content arrives at an optimum, the mechanical parameters no longer increase, but decrease significantly. After this optimum, the soil stabilization no longer shows advantages in the increase of geo-mechanical properties of soils.

Highlights

The Melong-Fongo Tongo Roadway pavement failure is a very serious problem that causes unnecessary delay in traffic flow, distorts pavement aesthetics and breakdown of vehicle
The bearing capacity proposed by these soils at their respective optimum dry densities is relatively small, most of these experimental California Bearing Ratio (CBR) values of the studied soils are more important than the ones prescribed by the American Association of State Highway and Transportation Officials Classification system (AASHTO) for A5, A6, and A7 types
Comparisons at different lime contents will be carried out in order to judge the optimal stabilization percentages for the improvement of the bearing capacity of FOMBAP soils, for stress-strain curves of some soils compacted at 55 strokes, and for the CBR index values obtained

Summary

Introduction

The Melong-Fongo Tongo Roadway pavement failure is a very serious problem that causes unnecessary delay in traffic flow, distorts pavement aesthetics and breakdown of vehicle. The types of distresses observed, associated to the relief of the region indicates clearly that the origin of the majority of road pathologies in the studied axle, is associated with subgrade ground defects [1] [2]. The soils in this area being mainly fine grained soils by granularity, in particular silty sand to sandy silts, are supposed to offer poor bearing capacity according to the literature [3]. The pavement subgrade can be made up of a wide variety of soil types, which shows different response to ameliorations, engineers should be able to find the appropriate process to make the stabilization of this section subgrade a reliable solution for the lifespan of the pavement

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Conclusion