Effect of PP fiber on concrete matrix
The concrete performance is obviously improved by adding #BDCHEM fiber into the concrete. The characteristics of fiber concrete are summarized as follows
(1) Compared with ordinary concrete, tensile strength, flexural strength (also known as breaking modulus, flexural strength and flexural strength) shear strength of fiber concrete are improved, especially for fiber concrete with high elastic modulus or high content fiber concrete.
(2) The #BDCHEM fiber in the cement matrix can significantly reduce the early shrinkage cracks, temperature cracks and long-term shrinkage cracks, prevent the expansion of the original defects (micro-cracks) in the cement matrix and effectively delay the emergence of new cracks.
(3) The shrinkage deformation and creep deformation of fiber reinforced concrete are lower than that of matrix concrete.
(4) The compressive fatigue, flexural fatigue, impact resistance and burst resistance of fiber reinforced concrete are significantly improved.
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(5) high elastic modulus fiber reinforced concrete for reinforced concrete and prestressed concrete members, can significantly improve the shear strength, punching strength, local compression strength and torsional strength of the member and delay the crack, reduce the crack width, improve the stiffness after the crack of the member, improve the ductility of the member.
(6) Because the #BDCHEM fiber can reduce the micro crack of concrete and prevent the expansion of macro crack, it can make its wear resistance, air erosion resistance, erosion resistance, freeze-thaw resistance and infiltration have different degrees of improvement;The rate of erosion medium immersion into the matrix is reduced, which is beneficial to the corrosion prevention of reinforced concrete members.
(7)Some special fiber prepared concrete, its thermal performance, electrical performance, durability than ordinary concrete also have changes.For example, the conductivity of carbon fiber concrete is significantly improved, and has a certain "piezoresistive effect";Low melting point synthetic fiber configured fiber concrete in the fire environment, fine fiber melting, can reduce the concrete burst.
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