Akademik Veri Yönetim Sistemi
ARABIAN JOURNAL OF GEOSCIENCES, ss.1-13, 2022 (SCI-Expanded)
Expansive clay found especially in the semi-arid or
arid regions of the world is a problematic soil that causes much damage to the
lightweight structures built by civil engineers. The Lime pile technique is one
of the improvement techniques applied for the stabilization of the expansive
clay subgrade layer of highway constructions. The achievement of this technique
depends on lime diffusion into expansive clay which is affected by some
parameters related to the lime pile such as the height of the lime pile, the
surrounding area of all lime piles, area ratio, total lime pile volume, water
percentages of the water-lime mixture, lignosulphonate added to the water-lime
mixture and curing time. In this study, the heights of the lime piles are equal to 2/3 of
active zone depth or full height of active zone depth, two different lime pile diameters
which are 4.5 mm and 6.5 mm are selected and three different water percentages
of lime-water mixtures are prepared as 0%, 18%, and 30%, respectively. Finally,
sodium lignosulphonate (NaLS) and calcium lignosulphonate (CaLS) are added separately
to the lime-water mixture. Thus, the lime pile parameters mentioned above have
been investigated in this study and the most effective lime pile installation
model has been developed. The Lime pile technique with NaLS
and CaLS addition prevented the formation of ettringite minerals. The swell
potentials of lime pile-treated soil with NaLS and CaLS addition were much
lower than the swell potential of lime pile-treated soil. Calcium
lignosulphonate is more effective than sodium lignosulphonate as calcium ions
are more prone to ion exchange than sodium ions. The best lime pile model is obtained when the heights
of the lime piles are equal to the full height of active zone depth and when
the water content of the water- lime- CaLS mixture is equal to 30%.