چكيده به لاتين
Nowadays, employing environmentally friendly materials with the least environmental consequences in soil stabilizations has gained more attention. In this work, we studied the impact of a new cement called volcanic ash (VA) -based geopolymer as an additive material for improving poorly-graded sandy soil (SP) in different curing conditions.We also investigated the mechanical performance of ordinary portland cement (OPC). The percentages of VA and OPC were 0%, 3%, 7% and 10% of the dry soil weight. Samples were made based on relative density of 30% and 10% moisture constant of soil composition and Stabilizer content. Sodium Hydroxide was used as an alkaline activator. Samples were treated in two conditions at room temperature with humidity and dry conditions at 60 ° C for 1, 7 and 28 days. In order to investigate the impact of stabilizing factors on soil engineering properties, soil resistance was evaluated by UCS and Scanning Electron Microscopy (SEM). The results of the experiments show that the cement increases the soil's resistance in room temperature conditions, and geopolymer does the same in dry conditions. The study shows the optimum amount of stabilizer to achieve the highest resistance is the amount of 7% volcanic ash at 28 days of treatment with a compressive strength of 1606.1 kPa. The study also shows that volcanic ash-based geopolymers can be used as a stabilizer in soil improvement projects with significant environmental benefits.
Keyword- Soil stabilization, Geopolymer, Cement, Sandy soil, Unconfined compressive strength
