Abstract: To explore the geometric and particle morphology of the coral reef sand, the particle morphology characteristics of three types of coral reef sand from different regions of an island in the South China Sea are thoroughly studied. Four parameters, namely, the aspect ratio, the aspect thickness ratio, the sphericity, and the convexity ratio, are selected to classify the particle shape of the coral reef sand. The analysis of the experimental results showed that the artificial crushed coral reef sand has the highest particle content in the block coral reef sand, It is the preferred aggregate type for preparing the coral reef sand concrete; The surface of the native coral reef sand particles is the most rough and angular, followed by the artificial fragmentation, and the surface of the hydraulic rounded coral reef sand is relatively flat and smooth; The larger the particle size, the rougher and more angular the surface of the coral reef sand particles, and the more obvious the performance of coral native coral reef sand; The angularity and the surface morphology characteristics of the coral reef sand particles with different particle sizes after artificial crushing are similar.

Key words: Coral Reef Sand, Particle Morphology, Image Identification, Shape Feature Evaluation, Surface Texture Features