Polypropylene fiber development prospects in high performance concrete

➤ modern architecture and construction from the viewpoint of sustainable development, the need to develop high-performance concrete, which is the main development direction of the current cement-based materials, known as "the 21st century concrete" more "green" sense. Improve durability of the building, to extend the life of the building, this advantage is extremely important.

➤ It is reported that the construction industry consumes nearly 40% of the world's energy resources, to extend the life of the building doubled consumption of energy resources and environmental pollution will reduce the 50%. In addition, due to lack of durability of concrete structures structure currently in use caused more serious damage, huge repair cost, many countries extend the durability of concrete are very seriously.

➤ Experts predict that our country will be of reinforced concrete structures damaged climax of the early 2000s, when the required annual maintenance costs will be as high as several hundred billion dollars. Compared with ordinary concrete, volume content of 0.05% (about 0.5kg / m³) of polypropylene fibers added to make concrete cracking capacity by nearly 70 percent, impermeability capacity by 60% --70%, to actively and effectively improve the durability of concrete structures, concrete high performance, and the working mechanism is simple, broad applicability, results have been significant in the engineering sector has been more and more attention. Although the production of polypropylene fibers addition to the investment, but it's moderate cost, the total investment in the project in a very small proportion, but they can exchange for great quality and efficiency of the project.

➤ Adding polypropylene fibers in concrete is an effective way to improve the properties of concrete. In North America and Europe, after 20 years, a large number of engineering practice, the use of polypropylene fibers blended concrete production technology has been improving, blended polypropylene fiber concrete has become one of the means to improve the performance of the most widely used. In China, with the widespread use of high performance concrete, polypropylene fiber in the modern construction industry will also have broad application prospects.

The important role of the polypropylene fibers in concrete
Contraction (1) to the random distribution form can weaken plastic shrinkage of concrete, polypropylene fiber shrinkage energy is dispersed to numerous filaments, which can effectively enhance the toughness of concrete, reducing the initial setting of concrete caused by cracks and when crack, improve impact resistance of concrete.
(2) incorporation of polypropylene fibers, as can effectively reduce the porosity of the concrete, to avoid the formation of pores in communication and improve the impermeability of concrete.
(3) adding polypropylene fiber concrete can effectively improve the frost resistance of concrete.
(4) polypropylene fibers for concrete works for the development of high performance concrete to provide a good way, and has broad prospects for development.