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Coating for concrete for maintenance and protection and its preparation and usage method

A technology for concrete and coatings, applied in the field of building materials, can solve the problems of not being able to use concrete structures for early maintenance, only considering the waterproof function, and not considering the corrosiveness of sulfate to coatings, etc., so as to prevent water loss, simple preparation process and cost. low cost effect

Inactive Publication Date: 2009-12-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing concrete protective coatings only have a certain protective function and cannot be used for early maintenance of concrete structures
Existing polymer-modified cement waterproof coatings only consider the waterproof function, and are generally formulated with ordinary cement, calcium carbonate fillers and polymer emulsions, without considering the aggressiveness of sulfate to the coating itself

Method used

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  • Coating for concrete for maintenance and protection and its preparation and usage method
  • Coating for concrete for maintenance and protection and its preparation and usage method
  • Coating for concrete for maintenance and protection and its preparation and usage method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this example, fluoroaluminate cement is used as the hydraulic cementitious material. The main hydration products of fluoroaluminate cement are trisulfide-type calcium sulfoaluminate hydrate, hydrated alumina gel and calcium silicate hydrate, which have outstanding sulfate resistance. The filler is talcum powder, and quartz powder can also be used. Since the fluoroaluminate cement is a block-setting rapid-hardening cement, although the polymer emulsion has a certain retarding effect, it is still possible to add (0.2-0.3)% boric acid of cement quality as a retarder if necessary.

[0025] The mass ratio of A and B components is A:B=1:1.

[0026] Table 2 The formula of B component in various embodiments

[0027]

Embodiment 2

[0029] In this example, sulfoaluminate cement was used as the hydraulic binder. The main hydration products of sulfoaluminate cement are trisulfide calcium sulfoaluminate hydrate and monosulfide hydrate sulfoaluminate, hydrated alumina gel and hydrated calcium silicate gel. It has good resistance to sulfate attack.

[0030] The mass ratio of A and B components is A:B=1:0.8.

Embodiment 3

[0032] In this example, aluminate ferrite cement was used as the hydraulic binder. Aluminoferric cement has good resistance to sulfuric acid. Using quartz powder and fine sand as fillers can make the paint more breathable.

[0033] The mass ratio of A and B components is A: B=1:1.6

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Abstract

An integrated coating for anti-sulfate maintenance and protection for concrete, comprising liquid component A and powder component B, the liquid component A comprising polymer emulsion, dispersant and defoamer; the powder component B comprising water Hard materials, fillers, fine sand. In the liquid component A: the content of the polymer emulsion is 100 parts by mass, the content of the dispersant is 0.5-2 parts by mass, and the content of the defoamer is 0.5-2 parts by mass; the content of the hydraulic material in the powder component B is 50 parts by mass. ~100 parts by mass, filler and fine sand content is 200~300 parts by mass; the present invention is a concrete coating with an integrated function of high-efficiency maintenance and protection, which has excellent maintenance effect and excellent protection performance at the same time, and can meet the protection of concrete structures under sulfate environment conditions requirements.

Description

technical field [0001] The invention belongs to the technical field of building materials and relates to concrete coatings. Background technique [0002] Now, people have formed a relatively broad consensus that the chemical corrosion resistance of concrete itself is limited, therefore, for concrete structures in a corrosive environment, an additional surface protection layer is necessary. Especially for concrete in a sulfate corrosion environment, in addition to ettringite and gypsum corrosion, there is also taumasite corrosion, which is at low temperature (<10°C) and has silicic acid Corrosion occurs in the presence of calcium, calcium carbonate, calcium sulfate, and water. The ordinary cement concrete used now contains calcium silicate and calcium carbonate. Therefore, under the low temperature conditions in the sulfate environment, the corrosion of the molarite type is inevitable. As far as the current technical level is concerned, the prevention of sulfate intrusio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B14/04C04B24/24C04B41/45
Inventor 钟世云薛明
Owner TONGJI UNIV
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