Abstract: A thick layer of soft clay is widely distributed in the coastal area. Coastal soft clay is characterized by high compressibility, high water content, high organic matter content, low bearing capacity, low permeability and prolonged stabilization time. Solidification treatment is one of the most popular and effective methods for improving the mechanical properties of coastal soft clay. Cement solidified coastal soft clay faces challenges such as poor durability, high energy consumption and carbon emissions. Alkali-activated cementitious material (AACM) is a green and low carbon cementitious material. Utilization of AACM for stabilizing coastal soft clay has become a research focus in the field of geotechnical engineering. However, several critical issues remain unresolved in the study of AACM solidified coastal soft clay. This study reviews the strength and water stability of AACM solidified coastal soft clay. The multiscale coupled solidification mechanism of AACM in coastal soft clay is elucidated. The shortcomings of current research on AACM solidified coastal soft clay are discussed. The sustainability of AACM solidified coastal soft clay is analyzed, and potential research suggestions are discussed. This study can provide new ideas and insights for the subsequent research and promotion of AACM solidified coastal soft clay.

Key words: coastal soft clay, alkali-activated cementitious material, multiscale solidification mechanism, water stability, sustainability analysis