Abstract
Effect of quick lime on physicochemical properties of clay soil
Highlights
Clayey soils have undesirable properties such as low bearing capacity, high compressibility and dispersive behavior
In order to investigate the effect of quicklime on the consistency limits, measures of liquid and plastic limits were carried out on soil samples at different percentages ranging from 0% to 8%
This high pH leads the dissolution of the silica and the alumina released from clay minerals, which react with lime creating new cementitious compounds such as calcium silicate hydrates (CSH), calcium aluminate hydrates (CAH) and calcium alumino-silicate hydrates (CASH) as shown in the following equations [42]: Ca2+ + 2(OH) - +SiO2
Summary
Clayey soils have undesirable properties such as low bearing capacity, high compressibility and dispersive behavior. The dissociation reaction of the hydrated lime formed due to the quicklime hydration leads to an increase of the pH and to a high concentration of calcium ions in the pore water [15] These phenomena cause several reactions in the soil matrix, creating a cation exchange effect and pozzolanic reactions [16]. In addition to cationic exchange, the high pH environment induced by lime enables the dissolution of the alumino-silicate constituents of clay minerals, promoting the development of the pozzolanic reactions [15] These reactions result in the formation of calcium silicate hydrate (CSH), calcium aluminate hydrate (CAH), and calcium alumino silicate hydrate (CASH) gels [19,20]. This may help to better understand the interactions occurring within the soil matrix
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