Effect of cyclic wetting and drying on swelling behavior of polymer-stabilized expansive clays

Free swell potential of lime-treated gypseous soil

“…At the same time, it was observed that the trend of reduction in swell potential of soil samples without gypsum is similar to that of samples with gypsum. The reduction in swell potential is attributed to destruction of the soil matrix (especially the clay structure matrix) during wetting-drying cycles, as well as to partial breakdown of the soil particles by reconstruction of the structure of aggregates that occurred during these cycles (Yazdandoust and Yasrobi, 2010). The results obtained in this investigation are in agreement with those reported by (Dif and Bluemel, 1991;Guney et al, 2007).…”

Intrinsic and model polymer hydrogel-induced soil structural stability of a silty sand soil as affected by soil moisture dynamics

“…Especially the decrease in PAA-associated water directly after each drying event indicates an increase in the polymer-particle surface contact and a reduced swelling potential of the interparticulate hydrogel as shown by several researchers (Chenu et al, 2000;Kemper and Rosenau, 1986;Levy et al, 1992;Santos and Serralheiro, 2000). As interfacial cohesive tension can strongly bind the soil particles together and reduces the space and hydrogel wettability (Wagner et al, 2007;Yazdandoust and Yasrobi, 2010), the relatively lower rheological stability directly after each remoistening might be the result of a higher proportion of relatively less stabilizing soil pore water instead of hydrogelassociated water. Furthermore, fast remoistening of dried soil can lead to the formation of cracks and results in a further loss of structural stability (Gli nski et al, 2011;Maghchiche et al, 2010).…”

“…It remains unclear if the stability of the polymer-treated soil would further decrease with additional drying/remoistening cycles or increase with longer additional incubation times before the next drying event. For example, the swelling behaviour of polymer-stabilized expansive clays showed the highest reduction in swelling already after the first drying/ remoistening cycle and remained stable from the fourth cycle on (Yazdandoust and Yasrobi, 2010). Furthermore, Todoruk et al (2003) and Schaumann et al (2005) stated water redistribution times in soil of even more than 19 days until reaching equilibrium conditions.…”

Experimental Study on the Influence of Polypropylene Fiber on the Swelling Pressure Expansion Attributes of Silica Fume Stabilized Clayey Soil

“…Expansive soils can be stabilized using mechanical and chemical treatment. Chemical treatment majorly involves the inclusion of chemical admixtures (e.g., polymers, cement, and lime) to the soil [6][7][8][9][10]. The mechanical approach includes the compaction of the soil with the addition of the strengthening material.…”