Effects of Aluminum Sulfate and Polyelectrolyte Solutions on the Geotechnical Properties of Organic Clay

Abstract

This paper presents the eŠects of dilute polyelectrolyte solution used in combination with aluminum sulfate on the geotechnical properties of a homogeneous high-plasticity organic clay derived from the puriˆcation of turbid water. Apart from the chemical additives, the alum-polyelectrolyte clay (APC) and untreated clay were similar in composition, comprising 41z micro-ˆbrous amorphous organic solids by dry mass. However, the geomechanical behavior of the APC material was enhanced by polymer-particle bridging phenomenon, which contributed to higher stress-strain modulus, 10-20z greater shear strength in undrained triaxial compression, a higher eŠective angle of shearing resistance value, reduced compressibility and a slower rate of consolidation compared to the untreated clay. Hence, this study raises the possibility of using dilute polyelectrolyte solution in combination with aluminum sulfate as an alternative soil improvement measure for organic residues and ultra-soft organic clay deposits.

Decision of Straw Deep Burial and Aluminum Sulfate Drip Irrigation in Soda Saline Soil Based on Grey Relation Analysis and TOPSIS Coupling

“…It has also been reported that the application of aluminum sulfate can significantly reduce soil pH [7], alleviate soil alkalinity [8], increase soil infiltration rate [9], and increase crop yield [10]. O'Kelly et al [11] proposed that H + released by hydrolysis of aluminum sulfate reacts with deposited calcium in the soil, which can alleviate soil salt surface polymerization and improve soil physical and chemical properties. Zhou et al [12] compared the improvement effects of organic fertilizer, bioinorganic fertilizer, organic-inorganic compound fertilizer, and different concentrations of aluminum sulfate, and further elaborated that aluminum sulfate can rapidly optimize soil structure.…”