A method for recycling steel fibers in steel fiber reinforced concrete

A reinforced concrete and fiber reinforced technology, which is applied in the field of steel fiber recycling and reuse in steel fiber reinforced concrete, can solve the problems of unsatisfactory failure mode, insufficient utilization of potential mechanical properties of energy dissipative fibers, and reduced toughness of composite materials.

Active Publication Date: 2022-05-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From a reinforcement point of view, this failure mode is not ideal due to the limited energy dissipation and underutilization of the potential mechanical properties of the fibers
In addition, the sudden release of energy greatly reduces the toughness of the composite

Method used

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  • A method for recycling steel fibers in steel fiber reinforced concrete
  • A method for recycling steel fibers in steel fiber reinforced concrete
  • A method for recycling steel fibers in steel fiber reinforced concrete

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Experimental program
Comparison scheme
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specific Embodiment approach 1

[0025] Specific embodiment one: The present embodiment records a method of recycling and reusing steel fibers in steel fiber reinforced concrete, the method steps are as follows:

[0026] Step 1: Prepare ordinary concrete or ultra-high-performance concrete: according to the mix ratio of ordinary concrete or ultra-high-performance concrete, on this basis, steel fibers are added, and the dosage is 50-160kg / m 3 At the same time, calcium sulfalinate expander is added, the dosage is 6%-12% of the quality of the cementitious material, and replaces the cementitious material of the same quality; the concrete includes sand, stone aggregate, mineral admixture, water, water reducer; the cementitious material refers to cement;

[0027] Step 2: Recycling of steel fibers in steel fiber reinforced concrete after demolition

[0028] (1) The steel fiber reinforced concrete after service demolition is completely soaked in anhydrous ethanol or isopropanol to prevent the steel fiber from rusting in con...

specific Embodiment approach 2

[0033] Specific embodiment two: a method of recycling and reusing steel fibers in steel fiber reinforced concrete described in specific embodiment I, in step one, the steel fibers are straight, end hook or wavy. Diameter 0.20mm, length 13mm, tensile strength 2850MPa, or other sizes and tensile strength.

Embodiment 1

[0035] The dosage of ultra-high performance concrete cement, silicon ash, expander, water, sand, steel fiber and polycarboxylic acid superplasticizer was 758kg / m respectively 3 、191kg / m 3 、83kg / m 3 、213kg / m 3 、1032kg / m 3 、153kg / m 3 、32kg / m 3。 Cement, silicon ash, intuminant added to the Hobart stirrer stirred for 4min, the water reducer and water mixed evenly into the Hobart stirrer stirred for 8min, the steel fibers were added to the agitator in 6 times The process took 10min, and finally added sand to stir for 6min, poured into the mold, laminated maintenance 36h demoulding. The specimen after demolding is placed in clean water for maintenance for 1 day, the size of the anti-bending specimen is 40mm×40mm×160mm prism, and then the flexural test is carried out, the specimen after the test is pressurized and destroyed, the flexural strength of ultra-high-performance concrete is determined after the end of the test 1, the ultra-high-performance concrete after the strength test is so...

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Abstract

The invention discloses a method for recycling steel fibers in steel fiber reinforced concrete, which belongs to the field of fiber reinforced concrete. The method is as follows: preparing ordinary concrete or ultra-high performance concrete, adding steel fiber and expansion agent; immersing the steel fiber reinforced concrete after demolition in service in absolute ethanol or isopropanol; 7 days as a cycle, each cycle The solvent is replaced within the solvent; after several cycles, the steel fiber and other component materials are naturally separated; the steel fiber reinforced concrete is paved, and the electromagnet is used to scan above the concrete. At this time, the steel fiber is magnetically sucked up, and the electromagnetic When the iron is removed and the power is cut off, the steel fibers fall from the electromagnet into the container; the recycled steel fibers are used to recreate the steel fiber reinforced concrete. The steel fiber reinforced concrete material prepared by the invention can completely recycle the steel fibers, and effectively remove the copper plating layer of the steel fibers to further strengthen the fiber interface.

Description

Technical field [0001] The present invention belongs to the field of fiber-reinforced concrete, specifically relates to a method of recycling and reusing steel fibers in steel fiber reinforced concrete. Background [0002] Concrete is a quasi-brittle material, and its ductility is usually improved by adding steel fibers. As the stress is transmitted from the matrix to the fiber, the fiber forms a bridge on the crack surface, resists crack propagation, and uses short steel fibers to enhance bending strength and toughness. At present, fiber-reinforced concrete has been widely used in structural fields such as prefabricated beams and thin precast panels for highways or bridges. [0003] When the fiber-reinforced concrete structure is faced with the problem of structural demolition after the end of service, its excellent mechanical properties and durability bring difficulties to the demolition of the structure, and the dismantled fiber-reinforced concrete material cannot recover the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B20/02C04B14/48C04B18/16
CPCC04B28/00C04B20/023C04B14/48C04B18/16C04B2111/00017C04B18/146C04B14/06C04B2103/302C04B22/142Y02W30/91
Inventor 肖会刚冯硕刘睿刘敏
Owner HARBIN INST OF TECH
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