Aggregate is the general name of sand, stone , gravel in water conservancy project, which is main building materials of concrete and pile stone in water conservancy project. Fine aggregate particles is between 0.16~5 mm. Generally, includes natural sand, such as river sand, sea sand and valley sand, can also be crushed by hard rock when natural sand is lacking; aggregate size bigger than 5 mm is called coarse aggregate, that is, stone.

With the continuous improvement of the industrial level of building materials in China, the importance of mine engineering is also increasing, the investment in mine construction is increasing, and the mining technology of mine has also made great progress. At present, the mining engineering technology in China has been mature, the theory and technology of scientific mining are becoming more and more abundant, and the application examples of high and new technology are more and more. How to choose the appropriate mining technology and equipment has become very important.

Since the economic reform and open up, the industrial powder technology has made rapid development, powder production, application and equipment manufacturing research and development progress is very fast, constantly new equipment, new products appear in the market, showing vigor and vitality. Powder industry in China is in a period of vigorous development, the demand for ultra-fine grinding technology and products is increasing rapidly, especially the market in developed countries is being gradually opened.

The application of industrial solid waste in building materials in China has been paid more and more attention to the world. The construction solid waste is stored in large quantities and seriously pollutes the environment. After recycling, the service life is long, it will not produce secondary pollution, also not become waste in a short time. Therefore, the use of solid waste to manufacture building materials is an effective way to save resources, eliminate waste and protect the environment.

Concrete mixing station is a joint device used to concentrate mixing concrete, also known as concrete precast yard. Because of its high degree of mechanization and automation, the productivity is also very high, and it can guarantee the quality of concrete and save cement. It is often used in large and medium water conservancy, electric power, bridge and other projects with large concrete engineering quantity, long construction period and concentrated construction site.

Dry mortar is also called mortar dry powder, dry mix mortar, dry mix powder, some building adhesives also belong to this kind. Dry mortar is widely used in building and decoration engineering because of its thin layer of bonding, cushioning, protection and decoration. A granular or powdery material that is physically mixed in a certain proportion of aggregate, inorganic cementitious materials and additives treated by drying and screening, and can be used directly after mixing with water.