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Method for rehabilitating concrete surface injury using high-strength abrasion-proof basalt fibre mortar

A basalt fiber and concrete surface technology, which is applied in building maintenance, bridge maintenance, sea area engineering, etc., can solve the problems of poor cement matrix adhesion, low strength and modulus, and high cost of steel fiber, and achieve good bonding performance and chemical Good stability and high tensile strength

Inactive Publication Date: 2008-08-06
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of steel fiber is high, the specificity is large, it is not easy to disperse, and it is not suitable for use in conventional cement-reinforced products.
Although polypropylene fiber can be uniformly dispersed in concrete, has stable chemical properties and simple construction, it also has defects such as high price, low strength and modulus, and poor adhesion to cement matrix.

Method used

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  • Method for rehabilitating concrete surface injury using high-strength abrasion-proof basalt fibre mortar
  • Method for rehabilitating concrete surface injury using high-strength abrasion-proof basalt fibre mortar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1 uses the method for repairing concrete surface trauma with high-strength wear-resistant basalt fiber mortar, and its method steps are as follows:

[0022] Treatment of spalling concrete on the surface of the lock chamber wall:

[0023] 1. Use mechanical methods to chisel the repaired surface, then blow it with high-pressure gas, rinse the surface with water, and finally spray the repaired surface with water to moisturize and maintain for 24 hours;

[0024] 2. Preparation of high-strength wear-resistant basalt fiber mortar: After fully mixing 700kg of cement, 1050kg of sand, 182kg of water, 4.9kg of high-efficiency water reducer β-naphthalenesulfonic acid formaldehyde condensate and 1.06kg of basalt fiber, it is made by fully stirring ;

[0025] 3. Brushing the adhesive: First, paint the repaired surface with the acrylic milk paste adhesive, and evenly brush the adhesive on the adhesive layer with a paint brush, and then paint the basalt fiber mortar prepar...

Embodiment 2

[0028] 1. Raw materials

[0029] The cement adopts No. 425 cement;

[0030] The sand is coarse quartz sand with a fineness modulus of 3.7 to 3.1, and the particles larger than 5mm are screened out;

[0031] High-efficiency water reducer is β-naphthalenesulfonate formaldehyde condensate

[0032] Basalt fiber properties:

[0033] Table 1 Performance parameters of basalt continuous fiber

[0034]

[0035] 2. Performance index of basalt fiber mortar

[0036] The test performance of basalt fiber mortar and its blank sample is shown in Table 2:

[0037] Table 2 Test performance of basalt fiber mortar

[0038] performance

blank sample

Basalt Fiber Mortar

28d compressive strength (MPa)

68.2

81.1

28d flexural strength (MPa)

10.2

14.3

Shrinkage rate×10-4(%)

1d

3.886

2.121

28d

8.215

7.684

28d tensile strength (MPa)

4.78

5.75

Bond strength between 28d and ...

Embodiment 3

[0043] Treatment of spalling concrete on the surface of the lock chamber wall:

[0044] 1. Use mechanical methods to chisel the repaired surface, then blow it with high-pressure gas, rinse the surface with water, and finally spray the repaired surface with water to moisturize and maintain for 24 hours;

[0045] 2. Preparation of high-strength wear-resistant basalt fiber mortar: After fully mixing 700kg of No. 425 cement, 1050kg of sand, 182kg of water, 4.9kg of β-naphthalenesulfonate formaldehyde condensate superplasticizer and 1.06kg of basalt fiber, fully stir Uniformly made, ready to use;

[0046] 3. Brushing the adhesive: First, paint the repaired surface with the acrylic milk paste adhesive, and evenly brush the adhesive on the adhesive layer with a paint brush, and then paint the basalt fiber mortar prepared above to repair the concrete surface after a little dry .

[0047] 4. Painting and maintenance, the painting steps are one coating, two leveling and three calender...

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Abstract

The invention discloses a process for repairing the surface wounds of concrete with basalt fiber plaster which is high strength and abrasion resistance. The repairing steps comprise firstly conducting chiseling, cleaning and curing moisture holding for the repair surface, and then brushing binding agent on the repair surface, then brushing basalt fiber plaster after slightly drying, and finally conducting the curing. The invention primarily proposes a process for repairing the large area wound such as surface concrete aging, carbonizing and peeling and cracking and the like on the hydraulic structure such as locks, dams and bridges and the like through preparing basalt fiber plaster which is high strength and abrasion resistance with chopped basalt fiber. The experiment shows that the surface concrete of hydraulic structure which is repaired has excellent mechanic property, impact abrasion resistance and excellent durability such as permeability resistance and anti-freezing, and favorable binding property, can meet the technical requirements of high speed sand inclusion current abrasion and corrosion resistance and ship attack and the like. And the repairing process has simple technology, low cost and excellent effect.

Description

technical field [0001] The invention relates to a method for repairing concrete on the surface of water and soil structures, in particular to a method for repairing aging, carbonization, spalling and cracking of surface concrete of hydraulic structures such as ship locks, dams and bridges. Background technique: [0002] Concrete structures are one of the most widely used structural forms in the field of civil engineering. However, due to the defects of the concrete material itself and the combined effects of its mix ratio, maintenance, construction environment and use factors, the performance of many cement-based materials has declined, seriously affecting its performance and life. However, due to the long-term erosion of water flow and sandy water flow, the hydraulic concrete structure suffered more significant damage: in 1984, a survey of 22 coastal hydraulic structures in Zhejiang found that 3 of them were severely damaged and abandoned, and they were in operation. In onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04G23/02E02B1/00E02B3/16E01D22/00C04B28/00C04B14/06C04B14/38C04B111/72
CPCC04B2111/29C04B2103/0044C04B2111/72C04B41/009C04B41/52C04B2111/00241C04B28/02
Inventor 江朝华张玮陈达
Owner HOHAI UNIV
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