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High-strength heat-resistant self-repairing concrete and preparation method thereof

A concrete and self-repairing technology, applied in the field of concrete, can solve problems such as failure to achieve the best use state, high water content of tuff raw ore, and ineffective use of stone powder, etc., to achieve improved adhesion, excellent mechanical properties, and crack prevention. Effect

Inactive Publication Date: 2020-06-09
FUJIAN DADI CONCRETE PILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water content of the tuff raw ore obtained from mining and crushing is too high, and it cannot be used optimally in industrial applications. In addition, a large amount of stone powder is produced during the production of tuff and has not been effectively utilized, which not only causes waste of resources

Method used

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  • High-strength heat-resistant self-repairing concrete and preparation method thereof
  • High-strength heat-resistant self-repairing concrete and preparation method thereof
  • High-strength heat-resistant self-repairing concrete and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] S1: The cement is P.O42.5 Portland cement, the fly ash is low calcium grade II, the fineness (45μm square hole sieve residue) is 8%, the water demand ratio is 95%, and the loss on ignition is 2 %, the crushed stone is 5-20mm continuous graded crushed stone, the fineness modulus of the medium sand is 2.3, the mud content is 2%, the mud content is 0.45%, the mineral powder is S95 grade mineral powder, and the activity index is 28 days The fluidity ratio is 95%, the coarse aggregate is mixed with hollow glass microspheres and ceramsite with a mass ratio of 1:1.2, the particle size of hollow glass microspheres is 10mm, and the particle size of ceramsite is 5mm .

[0056] S2: According to the ratio of raw materials in Table 2, fully mix the cement, fly ash, crushed stone, medium sand, mineral powder, and coarse aggregate in S1 to prepare premix A;

[0057] S3: According to the ratio of raw materials in Table 2, add aliphatic (hydroxyl) sulfonate high-efficiency water reduce...

Embodiment 2

[0058] The difference between embodiment 2 and embodiment 1 is: fly ash is low calcium II grade, fineness (45 μ m square hole sieve residue) is 11%, water demand ratio is 97%, loss on ignition is 3%, medium The fineness modulus of the sand is 2.7, the mud content is 2.3%, and the mud content is 0.55%. The coarse aggregate is made of hollow glass microspheres and ceramsite with a mass ratio of 1:1.4. The hollow glass microspheres The particle size is 13mm, and the particle size of ceramsite is 8mm. Add polycarboxylate high-efficiency water reducer and self-healing material 2 to S3, add premix A and mix thoroughly for 100 minutes.

Embodiment 3

[0059] The difference between embodiment 3 and embodiment 1 is: fly ash is low calcium II grade, fineness (45 μ m square hole sieve residue) is 13%, water demand ratio is 98%, loss on ignition is 4.5%, middle The fineness modulus of the sand is 3.0, the mud content is 2.6%, and the mud content is 0.65%. The coarse aggregate is made of hollow glass microspheres and ceramsite with a mass ratio of 1:1.5. The hollow glass microspheres The particle size is 15mm, and the particle size of ceramsite is 10mm. Add naphthalene-based water reducer and self-healing material 3 to S3, add premix A and mix thoroughly for 120 minutes.

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Abstract

The invention discloses high-strength heat-resistant self-repairing concrete and a preparation method thereof. The concrete comprises the following components in parts by weight: 340-360 parts of cement, 140-160 parts of fly ash, 750-800 parts of gravels, 730-750 parts of medium sand, 110-120 parts of coarse aggregate, 1-5 parts of a water reducing agent, 170-180 parts of water, 1-5 parts of polypropylene fibers, 50-80 parts of mineral powder, 1-5 parts of an early strength agent, 20-30 parts of composite fibers and 5-10 parts of a self-repairing material, wherein the coarse aggregate is formed by mixing hollow glass beads and ceramsite in a mass ratio of 1: (1.2-1.5); the composite fibers are composed of 5 to 10 parts of aramid fibers, 3 to 6 parts of glass fibers, 5 to 10 parts of resorcinol-formaldehyde resin and 0.3 to 1.4 parts of copolyoxymethylene; and the self-repairing material comprises 6 to 8 parts of cement and 2 to 4 parts of diluted epoxy resin, and further comprises 0.5to 1 part of calcined tuff and 0.5 to 1 part of carbon nanotubes. The high-strength heat-resistant concrete has the advantages of high strength and favorable heat resistance, and can realize self-repairing when a wall has broken cracks.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a concrete with high strength and good heat resistance, which can also realize self-repair when cracks appear in the wall body, and a preparation method thereof. Background technique [0002] Heat-resistant concrete refers to the special concrete that can still maintain its physical and mechanical properties and good resistance to rapid cooling and rapid heat under the long-term action of high temperature of 200-1300 °C, and has small shrinkage and deformation under high temperature. The application is very extensive. [0003] For the prior art, reference may be made to the Chinese patent whose authorized announcement number is CN105272020B, which discloses a C40 pumped concrete with a heat resistance of 500°C. 220, fly ash 80-100, slag powder 100-120, natural medium sand with a fineness modulus of 1.8-2.0 420-460, andesite machine-made sand 360-400, andesite 5-20mm continuous ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B20/04C04B111/34
CPCC04B20/04C04B28/04C04B2111/00017C04B2111/343C04B2201/20C04B2201/50C04B18/08C04B14/02C04B14/06C04B18/141C04B18/027C04B14/22C04B20/0076C04B24/16C04B16/0633C04B2103/10C04B14/42C04B16/0691C04B24/302C04B24/28C04B24/281C04B24/02C04B7/00C04B14/026C04B2103/302
Inventor 杨金辉杨晓彬董伟东周艳文冯三苟林丽华林成
Owner FUJIAN DADI CONCRETE PILE
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