Thermal shrinkage type fiber reinforced concrete

A fiber reinforced concrete technology, applied in the direction of fiber cutting, fiber treatment, fiber chemical characteristics, etc., can solve the problems of unsuitable concrete materials, low shrinkage strength, and difficult to disperse, and achieves low cost, high shrinkage rate, and improved mechanical properties. and the effect of rigidity

Pending Publication Date: 2022-05-13
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of fiber is mostly used in clothing fabrics. It has low shrinkage strength, small diameter, easy curling, and difficult dispersion, so it is not suitable for concrete materials.

Method used

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  • Thermal shrinkage type fiber reinforced concrete
  • Thermal shrinkage type fiber reinforced concrete
  • Thermal shrinkage type fiber reinforced concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] First prepare heat-shrinkable fiber A according to the following steps:

[0036] Choose 100 parts by weight of high-shrinkage polyester chips, 20 parts by weight of SiC whiskers, 3 parts by weight of triethylhexyl phosphoric acid, 2 parts by weight of zinc dialkyl dithiophosphate and 4.5 parts by weight of silane coupling agent , mixed to obtain raw materials. Dry the raw materials in a vacuum drying oven at 60°C for 12 hours, put them into a twin-screw extruder for blending and melt extrusion, and cool the raw fibers extruded from the extrusion port at a temperature of 10-20°C. Traction stretching, stretching 8 times, cooling at a temperature of 10-20°C; then performing a second stretching at a temperature of 110-115°C, stretching 1 time, to obtain heat-shrinkable fiber A, and cutting into lengths of 9mm chopped fibers with a fiber diameter of 0.15mm. The performance of the obtained heat-shrinkable fiber A: its density is 920kg / m 3 , The tensile strength at break is...

Embodiment 2

[0040] Using the heat-shrinkable fiber A in Example 1 to prepare concrete, the concrete mix ratio and curing method are the same as in Example 1, the difference is that the volume content of the heat-shrinkable fiber A is 2.5%, and the temperature of the water bath curing is 100°C .

Embodiment 3

[0042] The heat-shrinkable fiber A in Example 1 is used to prepare concrete, the concrete mix ratio is the same as that of Example 1, and the volumetric content of the heat-shrinkable fiber A is 3%. After the concrete is poured and shaped, it is cured in a standard curing environment for 24 hours, then placed in a steam curing box, heated at a rate of 15°C / h, maintained at a constant temperature of 85°C for 3 hours, and then cooled to 20°C at a rate of 10°C / h. Finally, put them in a standard conservation environment and preserve them for 28 days.

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Abstract

The invention relates to thermal shrinkage type fiber reinforced concrete. According to the invention, in a conventional concrete proportion, 0.9-4% by volume of heat-shrinkable fiber is added, and the heat-shrinkable fiber reinforced concrete is obtained after the concrete is molded and subjected to heat curing. The heat-shrinkable fiber is prepared by taking high-shrinkage polyester chips and a modifier as raw materials, carrying out melt blending extrusion through a certain temperature control program of an extruder, and carrying out traction and stretching. The thermal shrinkage type fiber shrinks under the thermal excitation effect and generates shrinkage stress, the shrinkage stress of the fiber is transmitted to a concrete matrix through the interface bonding effect of the fiber and the concrete matrix, and micro-scale prestress is uniformly applied to the concrete matrix, so that the flexural tensile strength, the volume stability and the crack resistance of the concrete are improved.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a heat-shrinkable fiber-reinforced concrete. Background technique [0002] The tensile strength of concrete is far lower than the compressive strength. During the service process, the structure is often cracked and damaged due to the bending load greater than the ultimate tensile strength of the material itself. The shortcoming of low ultimate tensile strength is also the direct cause of concrete cracking due to shrinkage (expansion) stress, temperature stress and humidity stress. [0003] In order to improve the crack resistance of high-strength concrete, fibers are usually used to resist cracking and toughen the concrete, so as to improve the tensile strength of concrete and prevent cracks from expanding. However, the fibers commonly used in concrete currently prevent the cracks from further expansion by bridging the concrete cracks after they appear, and the effect on improv...

Claims

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Application Information

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IPC IPC(8): C04B16/06D01F6/92D01F1/10D01D5/098D01G1/00
CPCC04B16/0683D01F6/92D01F1/10D01D5/098D01G1/00Y02W30/91
Inventor 吴静杨文丁庆军王罗新王桦
Owner WUHAN TEXTILE UNIV
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