AAS固化港区软土力学性能强化机制及微观演化机理研究OA

The use of Alkali-Activated Slag(AAS)as a cementing material for stabilizing soft soil foun-dations has demonstrated strong engineering potential while offering both economic and environmental benefits.In this study,soft soil samples collected from Jinan inland area was taken as the research object.A series of experimental studies were carried out to determine the optimum mix ratio of AAS-solid-ified soft soil and evaluate its mechanical properties.The influence of curing age on unconfined compressive strength was analyzed,and the rebound modulus and compression modulus of soft soil before and after curing were compared.The products of AAS cementitious materials were characterized using XRD and SEM-EDS,and the reaction mechanism was further examined by the TG-DTG and FTIR analyses.The results show that water glass as an activator significantly enhances the unconfined compres-sive strength,resilient modulus and compressive modulus of AAS-solidified soil,with the strength develo-ping rapidly at early time.The hydration products of AAS cementitious materials consist of calcium aluminosilicate hydrate,sodium aluminosilicate hydrate and calcium silicate hydrate.The three-dimen-sional network structure formed by these gels is the main factor contributing to the strength improvement of the solidified soil.