Cyclic Behaviour and Durability Analysis of Sand Grouted with Optimum Colloidal Silica Content

摘要

The main objective of the current research is to study the dynamic behaviour of colloidal silica treated grout. The treatment of foundation soil with colloidal silica improves the cyclic strength of the soil, which has the potential to reduce damages in buildings during earthquakes. Cyclic triaxial tests were conducted at various double amplitudes to understand the cyclic resistance of the colloidal silica grouted sand. The test results of untreated samples at different relative densitieswere compared with the treated samples having the same relative densities. The present study revealed that the optimum percentage of colloidal silica decreases with an increase in relative density. The grout inside the treated are awould undergo geothermal and water table changes. Wetting and drying cycles were studied to understand the durability of the above-mentioned grout. The samples sustained 18 wetting and drying cycles which in turn proves its superior durability characteristics. It was observed that the confining pressure, total energy capacity, as well as brittleness index and colloidal silica percentages, are some factors determining strength characteristics. Furthermore, the addition of colloidal silica in sand improves the cyclic resistance strength, damping ratio, and the shear modulus.