Reexamination of Lime Stabilization Mechanisms of Expansive Clay

Use of quick and hydrated lime in stabilization of lateritic soil: comparative analysis of laboratory data

“…10. This result is in good agreement with those reported by Chou [7], Du et al [15] and Zhao et al [27]. Apparently, quicklime-stabilized specimens proved to be mechanically stronger which indicate a potential to sustain higher bearing loads than hydrated lime-stabilized specimen albeit in small measures at the various dosage levels.…”

“…In addition, pozzolanic reactions occur later between the calcium ions and the silica and alumina of the clay minerals. This results in the formation of cementitious products such as calcium-silicate-hydrates (C-S-H), calcium-aluminate-hydrates (C-A-H) and calcium-aluminum-silicate-hydrates (C-A-S-H) that are also responsible for the strength increase [1,7,13,18,27].…”

“…Hydrated lime on the other hand is used extensively for the stabilisation of soils with high clay content where its main advantage is in raising the plastic limit of the clayey soil [2,8]. Beyond these, it has also been reported that the relative stabilizing effect correlates well with the calcium oxide (CaO) content of various limes [6,10,17,27].…”

“…However, the most widely used and best performing limes in soil stabilization are the quicklime (CaO) and hydrated (Ca(OH) 2 ) lime. While both quick and hydrated limes are capable of providing calcium ions (Ca 2+ ) in sufficient amount, the primary ingredient necessary for stabilizing a clay soil, they differ slightly in the mode of reaction in the presence of water [7,13,24,27]. Based on this difference, it is therefore important to evaluate ultimate superiority of one over the other in lateritic soil stabilization.…”

“…A wide range of investigations have been conducted on lime stabilization of soils in the past [2,3,9,10,16,17,22,27]. The most notable effect of lime on fine-grained soils is to produce decreased plasticity, increased workability, reduced swelling and shrinkage potential as well as increased strength [1,6,14,16].…”