Composite fiber for whole time anti-cracking for concrete

Abstract

The invention relates to duplex fiber used for resisting cracking of concrete throughout the course. The duplex fiber is prepared with the following synthetic fiber by weight: 15 to 50 percent of a high strength and high modulus synthetic fiber, 20 to 40 percent of a medium strength and medium modulus synthetic fiber, 20 to 45 percent of a low strength and low modulus synthetic fiber. The duplex fiber is prepared with fibers of different length, different elastic modulus and different strength of extension through compounding, thus forming a low strength and low modulus, medium strength and medium modulus, high strength and high modulus compound system. In this way, the duplex fiber not only has the advantages of various individual filaments but also has the superimposed effect of compounding of various fibers. Accordingly, the duplex fiber has synergistic actions in different periods when concrete is coagulated and hardened, which not only can prevent the plastic cracking of concrete, but also can effectively control the cracks during the hardening of concrete. In addition, the duplex fiber can effectively improve the toughness and the malleability of the concrete so that the durability of the concrete is significantly improved.

Description

【Technical Field】 [0001] The invention relates to a composite fiber used for full-process anti-cracking of concrete, and belongs to the field of synthetic fibers for cement concrete and mortar. 【Background technique】 [0002] In recent years, synthetic fiber concrete has developed rapidly in China. Synthetic fibers represented by polypropylene fiber have been widely used in many fields such as highways, water conservancy, municipal administration, and industrial and civil construction. The improvement of concrete performance has been recognized by the civil engineering community. Generally affirmed and recognized. At the same time, the application technology and theoretical research of synthetic fibers have also made great progress. [0003] Studies have shown that there are three main functions of synthetic fibers in concrete: crack resistance, strengthening and toughening. These functions mainly depend on the mechanical properties of the fibers themselves. It is generally belie...

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Problems solved by technology

Due to the random proportioning and complex metering during use, it is difficult to form an optimized and shaped hyb...

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