Abstract:
Cement Grouting is one of the popular methods that have been used to increase the density and the strength of the sandy soils at various depths. Also cement grouted sand will help with the minimization of the settlement and movements based on the application and environment. There is increasing interest in modifying the cement with various additives including polymers to enhance behavior. In the present study, the effect of a polycarboxylate (PCE) polymer up to 0.16% (by dry weight of cement) on the setting time, rheological properties and compressive behavior of cement-based grouted sandy soils with water-cement ratios (w/c) of 0.6 and 1.0 was investigated at 25o C and 50o C temperatures . The cement-based grout modified with polycarboxylate (PCE) polymer increased the yield stress, apparent viscosity and plastic viscosity by 19% to136%, 32% to 319% and 58% to 367%, respectively based on the polymer content and water-to-cement ratio. Also the polymermodified cement setting time was affected by the polymer modification..The compressive strength of the grout and the grouted sand increased based on the polymer content, w/c, curing time and the type of sand. Also the temperature affected the behavior of the polymer-modified cement grouted sand. All the changes in the compressive properties have been quantified based on the polymer addition and temperature. Vipulanandan p-q stress-strain model was used to predict the behavior of the polycarboxylate modified cement grouted sand.