English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Extended Abstract New development for a fast growing economy requires appropriate infrastructure and the mass exploitation of areas underlain by problematic soils is inevitable. Recent structural disorders due to soil movement in existing roads and buildings in these areas call for an urgent particular study of these formations, in order to mitigate such damages in future. In this study, a family of widespread expansive soil, namely Dark Magnesium Clay of the Lauzun family [1] comprising essentially montmorillonite clay particles, sampled from the Port Louis Ring Road Phase I project, is stabilized with variable lime content and the strength properties are investigated. Optimal lime content to yield maximum characteristic compressive strength at the age of 21 days is determined. The test specimens are prepared at maximum dry density (MDD) value, obtained from the standard Proctor compaction test, in compliance with BS 1377 [2]. Raw lime, acquired from local retailers, based in Mauritius, is used to prepare various trial mixes at 0%, 2.5%, 5%, 7.5%, 10%, 12.5% and 15% lime content. The soil and lime are mixed in a mechanical mortar mixer with a fixed rotational speed of the helix for a duration of 5 minutes. Water is then added and mixed for an additional 10 minutes [3]. For each mix, a set of three cubical specimens 40 mm x 40 mm x 40 mm are prepared in a mould with dimensions 40 mm x 40 mm and 40 mm high. The maximum dry density obtained from the standard Proctor compaction test is 1.437 g/cm with a corresponding optimum moisture content (OMC) value equal to 30.5%. The soil under investigation is classified as highly plastic with potential swelling and shrinkage properties (liquid limit = 53.4%, plastic limit = 27.2% and plasticity index = 26.2%). The mass of specimen required to fill the mould each time is defined as a function of the maximum dry density and the volume of mould which gives a mass of M g of soil mix to be pressed in the mould at OMC to achieve 1.437 g/cm MDD. The mass of soil and water needed for each increment of lime content is kept constant. An average compaction pressure of 8 MPa, which is possibly the equivalent proctor energy, was required to press the samples until they achieve 40 mm height [4]. The samples are demoulded and allowed to cure in a water-saturated and airtight container for 7 days at room temperature. After this period, samples are allowed to cure at ambient room temperature [5] and are then tested for their unconfined compressive strength at the age of 21 days. Results show that an addition of 7.5% of lime is adequate to yield a maximum unconfined compressive strength value of 5.5 MPa with a decrease in linear shrinkage value from 12.1% to 6.1 % or rather by 50%, allowing to conclude that an addition of an optimum amount of lime helps to improve the packing structure of the soil mass under study, thus improving its mechanical behaviour.

Stabilisation of Volcanic Dark Magnesium Clay using Lime