First, the fiber profile:
Building synthetic reinforcing fiber is a kind of polymer anti-crack anti-seepage material specially designed to solve the cracking problem of concrete cracking. The special modified polypropylene fiber for concrete is made from high-quality raw materials. The fiber surface is treated with a special process to ensure the strength and dispersion of the material and its cohesion with the cement matrix (bonding force). The addition of fiber is like adding hundreds of millions of three-dimensional random micro-ribbons distributed in the concrete. These fibers inhibit the progress of concrete cracking, improve the fracture toughness of concrete, and thus effectively inhibit the cracking of concrete, to achieve the purpose of improving the performance of concrete.
It is produced on a special microfibre production line, fineness is only 18 ~ 20μm, is a microfiber, the amount of which is small, only 0.6kg/m3 can play an outstanding effect in concrete crack resistance. According to the fiber length of 12mm, 0.6kg Angus fiber can contain up to hundreds of millions of roots and excellent anti-cracking.
Second, the mechanism of action:
Polypropylene fiber is a new kind of concrete reinforcing fiber, which is called the "secondary reinforcing bar" of concrete. There are two theories for reinforcing the concrete matrix:
1. The theory of composite materials using composite mechanics theory is mainly represented by British RNSwamy and American AENaaman. The theoretical basis is the mixing principle of composite materials. Fiber-reinforced concrete is regarded as a fiber-reinforced system, and the tensile strength and flexural strength of fiber-reinforced concrete are estimated using the mixing principle. The incorporation of fiber-reinforced concrete and its direction are proposed. The relationship between bond strength.
2, based on the fracture mechanics based on the fiber cracking theory (commonly known as the fiber spacing theory). Early by the United States JPPoaldi, JBBatsonJ and other. The theory holds that there are inherent defects and cracks in the concrete. If you want to improve the strength and toughness, you must reduce the degree of defects as much as possible, and reduce the stress concentration factor at the crack end of the concrete.
According to these two theories, this product has the following three main effects in concrete:
1. Improve the resistance to tensile deformation of concrete, prevent the expansion of original micro-cracks in the matrix and delay the appearance of new cracks;
2. Improve the anti-permeability of concrete;
3, improve the toughness and impact resistance of concrete.
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