Impact of sulfate attack on mechanical properties and hydraulic conductivity of a cement-admixed clay

摘要: Context and purpose Treatment of clay with cement has been used for various ground improvement geoenvironmental applications including vertical barriers to isolate contaminated areas. An important issue cement-treated clays is their durability especially when applied in chemically aggressive environments. The this study evaluate the impact chemical degradation on engineering properties clay. Methodology mechanical hydraulic behaviors a contact water an sodium sulfate solution were investigated. Bender elements installed flexible-wall conductivity cell simultaneously monitor small-strain shear modulus (G0) (k) cement-admixed Results During permeation clean water, increase G0 gradual decrease k time observed due hydration. Conversely, after solution, sudden recorded. Conclusions measurements provided evidence immediate deterioration sample as it comes sulfates. However, order have significant permeability, network interconnected preferential flow paths had first develop through whole sample. Monitoring was shown provide valuable additional information clays.