Abstract
The unconfined compressive strength test is the widely accepted protocol to investigate the strength properties of lime amended soil. As a quality control measure, specimens for unconfined compression test are prepared at a predetermined maximum dry density (MDD) using standard Proctor test. Replicating MDD in a small sized mould is difficult and subject to errors, which normally arise due to inconsistent compaction efforts. The conventional method for preparing specimens involves driving a core sampler into the compacted soil to extract the specimen. The approach proves to be laborious and is associated with high material usage, as such is not ideal for investigations of many variables. To address these challenges, an alternative protocol for specimen preparation at a controlled dry density was devised. In this study, a statistical analysis of the density values was used to validate the method. The regression analysis was employed to calibrate the compaction effort for a specified target density. The method offers manifold benefits such as;•Improved quality of specimens.•Reduced variability of UCS test data.•Efficiency.•Reduced material usage.
Highlights
Method detailsThe soil was initially characterised in accordance with ASTM D1140-17 [1] in order to ascertain its suitability for lime stabilisation
The unconfined compressive strength test is the widely accepted protocol to investigate the strength properties of lime amended soil
The trial specimens were prepared with compaction pressures of 1.5 MPa, 3 MPa, 5 MPa 7.5 MPa and 10 MPa at the constant optimum moisture content (OMC) obtained from the preliminary standard Proctor test
Summary
The soil was initially characterised in accordance with ASTM D1140-17 [1] in order to ascertain its suitability for lime stabilisation. The specimens were prepared by statically compacting the soil composite into 3 layers. Deformation of the soil exerted hoop force F perpendicular to the interior surface of the mould. P 1⁄4 mF ð2Þ where P is maximum load to initiate rigid body motion at the first stroke, F is hoop force and m is the coefficient of friction/adhesion. In this case, the subsequent strokes were subjected to lower static frictional resistance due to reduced coefficient of friction and adhesion between soil and the mould. Extrusion could not exert stress higher than compaction pressure that could affect soil stress state
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