In recent years, Chemical grouting method is often being employed as an effective countermeasure against soil liquefaction problems in urban areas.
However, the development mechanism of early-strength of chemically grouted soil immediately after construction is not clearly understood. Thus, this study investigates the development of chemically grouted sandy soil strength and the dynamic modulus, G after construction using various concentrations of silica in silica-based chemical grout.
To investigate this, chemically grouted sand samples with two silica concentrations of 4.5% and 5.8% as well as untreated sand specimens were prepared in the laboratory. Tests were conducted on both the treated and untreated test samples using the triaxal test machine with bender element (BE) to obtain the initial shear modulus, G at the curing age of one week. Furthermore, the test samples were subjected to the unconfined compression test immediately after the triaxial test.
The test results confirm that increased silica content in the chemical grout displays much higher early-strength for the curing time of 7 days and the shear modulus, G depends on the confined pressure. Other methods maybe required the exact analysis of micro structures.