The crack resistant fiber is made of 100% polypropylene, which is melted, extrudedwire drawing, cutting and other processes, which is specially added to mortarcement concreteIt is a crack resistant fiber with crack resistance and permeability resistance.
In order to ensure that the crack resistant fiber can be well dispersed in mortar and cement concrete, the surface of the crack resistant fiber is treated by special process before cutting.Because it mainly uses polypropylene as raw material, it is also calledPolypropylene fiber。Anti crack fiber acts in mortar and cement concrete, and can effectively prevent the generation and development of maintenance cracks in mortar and cement concrete by its unique tensile strength, dispersibility, melting point, ignition point, acid and alkali resistance and other properties.
One kind of crack resistant fiber isCellulosic fibre, which is made of a special plant species in alpine regions through a series of unique chemical treatment and mechanical processing. It has natural hydrophilicity, high strength and high modulusplant cellNatural splitting growth is not made artificially, which makes the surface have strongGripping power。In the subsequent processing, special electrodeless materials are used to make the fiber into sheet monomer, which is convenient for fiber transportation and delivery.Under the action of water immersion and mixer friction, sheet monomer is easily dispersed into fiber monofilament, which has anti cracking effect and can effectively improve the mechanical properties of concrete, freeze-thaw resistance andImpermeability。
Fibers of other materials and forms not involved should be used as long as the following conditions are metConcrete fiberMedium.(1) Add it to the concrete and disperse it evenly;(2) Not corroded or melted;(3) Environmental protection and pollution-free;(4) And concreteWorkabilityGood;(5) It can effectively improve some properties of concrete.
Concrete and mortar not only refer tocement concreteAnd mortar, also coveringasphalt concreteAnd mortar, but the latter shall be specially increased in fiber selectionHeat resistanceInspection of.Fibers of any form and material used for other purposes other than concrete are not included in this list.
Principle of action
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Mortarcement concreteThe reason for cracking is that structural deformation cracks and non load deformation cracks are divided into cracks caused by external loads,Foundation deformation、subgradeDeformation, bridge foundation deformation（differential settlement And differential expansion) and structural temperature difference;No load deformation cracks are divided into shrinkage cracks, plastic cracksConcrete corrosionCracks, corrosion cracks of reinforcement in concreteAlkali aggregate reactionCracks, shear cracks caused by vibration fatigue and inertia vibration.[1]
matters needing attention
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Add anti crack fiberConcrete mixerThere is no special requirement for the mixing equipment, only the anti crack fiber needs to be put into the mixer according to the mix proportion of the design drawing, and the mixing time is slightly extended to make the anti crack fibermortar、cement concreteStir evenly in.
Crack resistant fiber cannot replace structural reinforcement materials, nor can it reduce the size of the main body, nor can it solve the settlement alone,Mass concreteIn the case of hydrothermal and strong external impact, the construction quality requirements shall not be reduced due to the use of fiber, and the construction and maintenance shall be carried out according to the national technical specifications.
Fiber content
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The amount of mixed fiber per cubic meter of concrete is 0.9-1.8Kg
Mixed fiber/ton dry sand slurry: 1kg
Dosing range: 0.6-1.8 kg/m ³
The crack resistance and seepage prevention of concrete is usually 0.9kg/m3
