COMPARATIVE RELIABILITY ESTIMATES OF COMPACTION CHARACTERISTICS OF SAMPLE RE-USE (SR) AND FRESH SAMPLE (FS) COMPACTION OF LATERITIC SOIL AS ROAD PAVEMENT MATERIAL

A first-order reliability program (FORM) incorporated in FORTRAN program was employed to investigate the influence of sample re-use (SR) and fresh sample (FS) compaction of lateritic soil as pavement material compacted at the energy level of British Standard Light (BSL), and centred on regression eq...

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Bibliographic Details
Published in:Annals of Faculty Engineering Hunedoara 2021-02, Vol.19 (1), p.91-100
Main Authors: Yohanna, Paul, Nwaiwu, Charles Malachy Okechukwu
Format: Article
Language:English
Subjects:
Approximation
Clay soils
Coefficient of variation
Compacted soils
Dependent variables
Design
Dry density
Energy levels
Engineering
Flexible pavements
Independent variables
Laboratories
Mathematical models
Moisture content
Pavement materials
Random variables
Regression
Reliability
Roads & highways
Soil compaction
Soil moisture
Soil properties
Specific gravity
Standard deviation
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Summary:A first-order reliability program (FORM) incorporated in FORTRAN program was employed to investigate the influence of sample re-use (SR) and fresh sample (FS) compaction of lateritic soil as pavement material compacted at the energy level of British Standard Light (BSL), and centred on regression equations established from laboratory results. The numerical properties of re-use (SR) and fresh sample (FS) compaction properties of lateritic soil were related with those from which the regression equations were formed. By means of regression equations for re-use and fresh sample compaction characteristics, for the related soil properties, reliability index (RI) were computed bearing in mind re-use and fresh sample compaction characteristics (Maximum Dry Density, MDD and Optimum Moisture Content, OMC) as dependent variables and the soil properties (gravel content, clay content, silt content, sand content and specific gravity) as independent variables. The results indicated that in the laboratory developed model, RI is dependent on variations in all the soil parameters. Generally, Observed trend showed that lower RI values for MDD sample re-use was recorded over the MDD fresh sample compaction. In the case of OMCs, higher RI values were observed for sample re-use compaction over fresh sample compaction. Although lower RI values for MDD sample re-use was recorded over MDD fresh sample compaction. However, OMCs of re-use sample compaction with higher RI must be strictly controlled in compacted lateritic soil as road pavement sub-base material. Stochastically, BSL compactive efforts did not produced tolerable safety index of 1.0 as recommended by the Nordic Committee on Building Regulation. Therefore higher energy level compacted using sample re-use compaction method is commended to model compaction properties of lateritic soil use as material for road sub-base of flexible pavement at Coefficient of Variation(COV) of 10-100 % range.
ISSN:1584-2665
2601-2332