Precast concrete using bagged cement, bulk cement, commercial concrete and their advantages
The so-called bagged cement refers to cement that is shipped, transported, stored and used in paper bags (including peritoneal woven bags, composite bags, etc.). Its disadvantages:
1 high energy consumption. For every 10,000 tons of bagged cement, it consumes 330m3 of wood, 22 tons of caustic soda, 78 tons of coal, 12,000 m3 of water, and consumes 72,000 kWh of electricity.
2 dust is big. In the construction project, the breakage rate of bagged cement is 5%, and the cement in dust particles accounts for 10%-20%.
3 Slow loading and unloading, high strength and poor working conditions.
4 high cost. The comprehensive cost of each 10,000 tons of bagged cement, paper bags (or woven bags, etc.), handling, bag unloading, and damage is more than 640,000 yuan.
5 bags of cement for half a year will reduce the strength by 20-30%, can not be transported all day, all open air operations.
The so-called bulk cement refers to the packaging without paper bags (including plastic bags, composite bags, etc.), strictly control the cement production process, improve product quality (especially cement stability indicators), and directly pass special equipment (including bulk cement distribution facilities, special Transportation, storage tanks) Cement that is shipped, transported, and stored. It is the product of technological and management advancement. The development of bulk cement is a major technical and economic policy measure set by the state. Bulk cement has the characteristics of no paper bag packaging, mechanized work, general use of special machines and tools, and a certain number of standards. Its advantages:
1 Save a lot of energy and resources. Save a lot of wood, protect forest resources and protect the ecological environment;
2 Promote and improve the quality of cement products, concrete quality and engineering quality;
3 is the only way for the building materials industry, the storage and transportation industry and the construction industry to achieve modernization;
4 is one of the important contents to improve the overall quality of the national economy;
5 Greatly improve the working environment and protect the health of working people;
6 Reduce cement dust pollution during construction and protect the environment.