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Permeable concrete protecting agent

A technology for concrete and protective agent, applied in the field of building materials, can solve the problems of inability to play a protective role in concrete, easy to age, etc., and achieve the effects of improving anti-freezing and anti-salt-freezing properties, improving impermeability, and being convenient to use.

Inactive Publication Date: 2003-04-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most commonly used protective measure for formed concrete is surface treatment of concrete, such as coating silicone emulsion or water-based epoxy on the surface of concrete to form a hydrophobic layer or protective film on the surface of concrete. This type of protective agent is based on organic substances. Mainly, although it is effective, it is easy to age, so it cannot play a long-lasting protective effect on concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Protective agent formula is as follows (by weight):

[0041] Sodium silicate hydrate 10

[0042] Polyhydroxy etherified melamine 3

[0043] sodium sulfate 1

[0044] Sodium carbonate 0.5

[0045] Sodium fluorosilicate 1.5

[0046] Aluminum Chloride 1.5

[0047] Triethanolamine 2

[0048] Sodium butylnaphthalene sulfonate 0.5

[0049] Alkyl phosphate 0.1

[0050] water 80

[0051] Prepared as described above.

[0052] After being treated with this protective agent, the performance test of concrete (C30) is as follows:

[0053] Impermeability pressure: >3.0MPa:

[0054] Antifreeze label: >D300

[0055] Water absorption: 65% (compared to untreated concrete)

[0056] Compressive strength: 31% higher (compared to untreated concrete)

[0057] Flexural strength: 25% higher (compared to untreated concrete)

[0058] Abrasion resistance: 18% higher (compared to untreated concrete)

Embodiment 2

[0060] Protective agent formula is as follows (by weight):

[0061] Sodium silicate hydrate 8

[0062] Polyhydroxy etherified melamine 2

[0063]Sodium sulfate 1.5

[0064] Sodium fluorosilicate 1.0

[0065] Aluminum Chloride 1.0

[0066] Triethanolamine 2

[0067] Sodium butylnaphthalene sulfonate 0.5

[0068] Alkyl phosphate 0.1

[0069] water 84

[0070] The preparation process is the same as before.

[0071] After being treated with this protective agent, the performance test of concrete (C30) is as follows:

[0072] Impermeability pressure: >3.0MPa

[0073] Antifreeze label: >D300

[0074] Water absorption: 72% (compared to untreated concrete)

[0075] Compressive strength: 26% higher (compared to untreated concrete)

[0076] Flexural strength: 23% higher (compared to untreated concrete)

[0077] Abrasion resistance: 17% higher (compared to untreated concrete)

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Abstract

The present invention relates to building material technology and is especially one kind of inorganic concrete protecting agent and its preparation. The protecting agent has sodium silicate as main component and certain amount of chemical stimulating promoter added during its preparation. The protecting agent may permeate into internal of concrete to form permanent protecting layer to raise the impermeability greatly. In addition, concret processed with the protecting agent has greatly improved chemical corrosion resistance, frost resistance, wear resistance, etc.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a concrete inorganic protective agent and a preparation method thereof. technical background [0002] Concrete is a multi-phase and porous material. The various durability properties of concrete, such as dry-wet cycle damage, carbonation damage, chloride ion erosion, sulfate damage, freeze-thaw damage, etc., are almost related to permeability, because the penetration of concrete Sexuality controls the penetration rate of liquid (or gas), and after the harmful liquid or gas penetrates into the concrete, it will have a series of physical, chemical, physicochemical or mechanical interactions with the components of the concrete; moisture is used as a vehicle for eroding ions , it can also transport the products due to chemical erosion out of the concrete body in time, and then replenish the aggressive ions, causing a vicious circle; water itself also plays a ve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26
CPCC04B2111/20C04B2111/00482C04B28/26
Inventor 杨钱荣
Owner TONGJI UNIV