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Abstract
The study presented in this paper evaluates the suitability of using slag (with cement) as a stabilizer, for improving the performance of expansive subgrade soil in road pavement. Several laboratory tests were conducted to determine the geotechnical engineering characteristics of the expansive soil and associated mechanical engineering performance. The tests conducted include the particle size distribution, standard Proctor compaction, Atterberg’s limits, free swelling, permeability, California bearing ratio (CBR), unconfined compressive strength (UCS), and repeated load triaxial (RLT). In this study, the use of slag (with cement) as a stabilizer followed three proportion schemes, and the selection of a specific stabilizer proportion was determined based on UCS value that satisfies the required standard as a subgrade for road pavement. The results recommended a stabilizer proportion for the soil studied to be 13.5% slag + 1.5% cement at 28 days curing time. This mixture resulted in a remarkable increase in the UCS value of eight times higher than the UCS value of the non-stabilized soil. The CBR value of the mixture was four times higher than the minimum required value for design of road pavement. The study presented herein confirmed that the exploitation of the by-product material of slag can indeed be useful, both in terms of improving the performance of the subgrade soil for road pavement and sparing the environment a spread of significant potential pollutant.
Highlights
A sample code is used for the mixtures tested, and the results indicate that the values of optimum moisture content (OMC) and maximum dry density (MDD) for all tested mixtures are not very dissimilar
The use of slag to stabilize an expansive subgrade soil from Baldivis (Perth, Western Australia) was performed through a series of comprehensive geotechnical investigation supported by extensive laboratory tests
Soil stabilized in the current study can be classified as medium expansive concerning the activity index of 1.5 and free swell index of 91%
Summary
Each layer has a certain thickness to support loads derived from traffic loads which transfer these loads to the subgrade. The subgrade may be either a native soil or an imported material. If the found native soil is deemed insufficient to have adequate carrying capacity as subgrade, it is usually treated (stabilized) appropriately. This is done to avoid the high costs that may arise to when bringing material from other places. To determine the type of stabilization to be carried out, a series of investigations in the laboratory is needed to determine the bearing capacity of the https://doi.org/10.10 51/matecconf /201927605002 stabilization results. Stabilized soil bearing capacity is usually associated with specific geotechnical properties of the soil mixture
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