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Water proof admixture composition with fine corrosion-resisting property for concrete

A technology of anti-corrosion and concrete, applied in solid waste management, climate sustainability, sustainable waste treatment, etc., can solve the problems of deterioration of performance and durability of concrete structures, corrosion of steel bars, failure to obtain anti-corrosion effects, etc.

Inactive Publication Date: 2004-06-09
JANG SAN CM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Although the waterproofing admixture composition achieves improved anti-corrosion effects compared to conventional compositions, it has the problem that it is used in concrete structures located in highly saline coastal areas and in facilities processing environmental pollutants. When the material is used, a satisfactory anti-corrosion effect cannot be obtained, so the deterioration of the performance and durability of the concrete structure cannot be avoided
These ions destroy the passive layer formed around the reinforcement used in concrete structures, leading to corrosion of the reinforcement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0047] With 780 parts by weight of calcium nitrite as inorganic salt, 60 parts by weight of tannin as antioxidant, 1383 parts by weight of fly ash, 288 parts by weight of silica fume, 231 parts by weight of higher fatty acid base metal salt, 120 parts by weight The polynaphthalene sulfonate, 138 parts by weight of the redispersible powder polymer containing ethylene / vinyl laurate / vinyl chloride terpolymerization as the main component are mixed to prepare a waterproof admixture.

[0048] 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, and 8.0 parts by weight of the waterproof admixture thus prepared were added to 100 parts by weight of cement, respectively, to produce concrete. The slump, air volume, setting time, compressive strength, water permeability ratio, water absorption ratio and relative resilience modulus of concrete were measured according to KS F 4926 standard method. The results are shown in Table 2 below. The blending conditions for making the concrete are listed in Table 1 b...

Embodiment 9-15

[0062] With 780 parts by weight of calcium nitrite as inorganic salt, 60 parts by weight of tannin as antioxidant, 1383 parts by weight of fly ash, 288 parts by weight of silica fume, 231 parts by weight of higher fatty acid base metal salt, 120 parts by weight Polynaphthalene sulfonate, 138 parts by weight of redispersible powder polymer containing ethylene / vinyl laurate / vinyl chloride terpolymer as the main component were mixed to prepare a waterproof admixture.

[0063] According to the blending ratio shown in Table 3 below, the waterproof admixture formulated above was added to 100 parts by weight of cement to manufacture concrete. Corrosion resistance of steel bars in fabricated concrete was evaluated by corrosion acceleration test of steel bars according to KS F 2561 standard method. The results are shown in Table 4 below. For the corrosion promotion test of steel bars and the evaluation of the corrosion resistance of each admixture, based on the sand used for concrete,...

Embodiment 16-20

[0074] With 900 parts by weight of calcium nitrite as inorganic salt, 30 parts by weight of tannin as antioxidant, 1273 parts by weight of fly ash, 318 parts by weight of silica fume, 291 parts by weight of higher fatty acid base metal salt, 120 parts by weight Polymelamine sulfonate, 68 parts by weight of a redispersible powder polymer containing vinyl acetate / ethylene copolymer as a main component were mixed to prepare a waterproof admixture.

[0075] 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 and 8.0 parts by weight of the waterproof admixture prepared above were added to 100 parts by weight of cement respectively to produce concrete. The slump, air volume, setting time, compressive strength, water permeability ratio, water absorption ratio and relative resilience modulus of concrete were measured according to KS F 4926 standard method. The results are shown in Table 6 below. The blending conditions for making the concrete are listed in Table 5 below.

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Abstract

Disclosed herein is a waterproof admixture composition for concrete which is added to fabricate concrete having excellent anti-corrosive performance. The waterproof admixture composition can protect reinforcing steel bars against oxidation in the presence of salt, thereby ensuring excellent anti-corrosive performance and thus greatly improving the durability of reinforced concrete even in salt-damaged areas and corrosive environments and the like by inhibiting the corrosion of the reinforced concrete. The waterproof admixture composition comprises fly ash and silica fume as artificial pozzolan activators, a redispersible powders resin, a higher fatty acid-based metal salt and a high performance water-reducing agent wherein the composition further comprises 18 to 34% by weight of an inorganic salt and 1 to 5% by weight of tannin as an antioxidant, based on the total weight of the composition.

Description

technical field [0001] The present invention relates to a waterproof admixture composition for concrete, which is added to produce concrete with excellent corrosion resistance, more particularly to a waterproof admixture composition for concrete with excellent corrosion resistance, which can be used in The steel bars in concrete are protected from oxidation in the presence of salt, thus exhibiting excellent corrosion resistance and thus greatly improving the durability of reinforced concrete. As a result, the waterproof admixture composition for concrete can be effectively used even in damaged areas and corrosive environments and the like. Background technique [0002] Various structures composed of concrete are exposed to specific environmental conditions, such as physical and chemical conditions, which directly or indirectly affect the concrete structure. In particular, most concrete facilities may be exposed to moisture such as rain, causing deterioration of the performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/00C04B18/08C04B22/06C04B22/08C04B24/08C04B24/22C04B24/24C04B24/30C04B28/02C04B40/00C04B103/61C04B103/65C04B111/26C04B111/27
CPCC04B28/02C04B2111/26C04B2103/0057C04B2103/65C04B2103/32C04B40/0039Y02W30/91C04B18/08C04B18/146C04B22/08C04B24/08C04B24/226C04B24/2688C04B24/38C04B2103/608C04B24/223C04B24/2641
Inventor 申道喆金元华
Owner JANG SAN CM