Some coastal countries and regions have begun to consider using sea sand instead of natural river sand, such as the Netherlands, France and Denmark. China, with its long coastline and vast shallow seas, is rich in sea sand resources. Therefore, some areas such as Guangdong Province have begun to accelerate the mining of sea sand, but some areas still resolutely resist sea sand, such as Shanghai. The same is the coastal area, why is the attitude towards sea sand completely different? Can sea sand be used for concrete aggregate? If so, how to use sea sand for construction?