A concrete waterproofing agent and a method for preparing the same

Abstract

The application relates to a concrete waterproof agent and a preparation method thereof, and belongs to the technical field of building materials. The waterproof agent can be widely applied to concrete anti-permeation and waterproof construction of subways, port wharfs, dam pools, tunnels, basements and the like. Raw materials and weight fractions of the waterproof agent are as follows: calcium oxide 20-60 parts, potassium aluminum sulfate 15-30 parts, magnesium oxide 5-25 parts, high water absorption resin 5-15 parts, hydrophobic component 10-20 parts, hydrophobic micro-fine silica aerogel powder 40-60 parts, sodium silicate 10-15 parts, ethylenediaminetetraacetic acid disodium 8-16 parts, glycine 8-16 parts, magnesium lithium silicate 6-15 parts, fly ash 150-200 parts, silica ash 20-60 parts and water reducing agent 1-3 parts. The waterproof agent has excellent anti-permeation and waterproof effects, can improve the strength and stability of concrete, and can be widely applied to concrete anti-permeation and waterproof construction of subways, port wharfs, dam pools, tunnels, basements and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to a concrete waterproofing agent and a preparation method thereof, in particular to a concrete waterproofing agent for subway, port wharf, dam pool, tunnel and basement and a preparation method thereof, and belongs to the technical field of building materials. BACKGROUND

[0002] In the construction, municipal, transportation, water conservancy and other national infrastructure projects, countries around the world cannot do without concrete, which plays an important role in construction. In the construction industry of our country, brick and concrete structure and reinforced concrete structure will still dominate in the future. However, in the construction and operation process, the leakage of concrete engineering structure is a big problem in the construction industry. The leakage of concrete structure not only needs a lot of manpower and material resources for repair, but also brings many inconveniences to daily life, and even seriously affects people's life and health.

[0003] Patent application CN108383417A discloses a kind of concrete waterproofing agent, which is made of the following weight parts of raw materials: wood calcium powder 15~20 parts, alunite 7~9 parts, polyoxyethylene fatty alcohol ether 5~8 parts, nano silicon dioxide 4~8 parts, sodium fluorosilicate 9~16 parts, sodium alkyl benzene sulfonate 5~8 parts, silk white powder 5~10 parts, polyacrylic acid sodium 4~10 parts, methyl sodium silicate 20~30 parts, chromium oxide 5~12 parts, molasses 7~12 parts, sulfur trioxide 10~18 parts, calcium phosphate 8~19 parts, tetraethyl orthosilicate 21~27 parts, phenyl salicylate 10~14 parts, calcium hydroxide 10~18 parts, perfluorooctyl triethoxysilane 3~7 parts, stearic acid 10~20 parts, potassium hydroxide 1~3 parts, but its waterproof effect and stability still need to be clear and improved. SUMMARY

[0004] In view of the problems existing in the prior art, one of the purposes of the present application is to provide a concrete waterproofing agent, which has excellent anti-permeability and waterproofing effect.

[0005] The second purpose of the present application is to provide a preparation method of a concrete waterproofing agent, which has simple steps, easy operation and batch production.

[0006] The purpose of the present application is achieved by the following technical solutions.

[0007] A concrete waterproofing agent, raw materials and weight fractions of the waterproofing agent are as follows: calcium oxide 20-60 parts, potassium aluminum sulfate 15-30 parts, magnesium oxide 5-25 parts, high water absorption resin 5-15 parts, hydrophobic component 10-20 parts, hydrophobic micro-fine silica aerogel powder 40-60 parts, sodium silicate 10-15 parts, disodium ethylenediaminetetraacetate 8-16 parts, glycine 8-16 parts, magnesium lithium silicate 6-15 parts, fly ash 150-200 parts, silica ash 20-60 parts, water reducing agent 1-3 parts;

[0008] The high water absorption resin has a water absorption rate of 550% or more; preferably, the high water absorption resin is polyacrylamide, polyacrylic acid, polyacrylic acid salt or sodium hydroxymethyl cellulose; further preferably, the high water absorption resin is polyacrylamide.

[0009] The hydrophobic micro-fine silica aerogel powder is prepared by the following method: grinding silica aerogel to a specific surface area of more than 100 m 2 / g and a fineness of 45 μm square hole sieve residue amount <10%, then adding organosilane and heating at 90-130°C for 30-90 min, and separating and drying to obtain the hydrophobic micro-fine silica aerogel powder; the organosilane is at least one of n-octyl triethoxysilane, propyl triethoxysilane and methyl triethoxysilane; the mass of the added organosilane is 6%-9% of the mass of the silica aerogel;

[0010] The hydrophobic component is organic silicon type hydrophobic powder and higher fatty acid; preferably, the hydrophobic component is high molecular organic silicon hydrophobic powder and stearic acid, and the mass ratio of the high molecular organic silicon hydrophobic powder and the stearic acid is 1:1.

[0011] Preferably, the mass ratio of ethylenediaminetetraacetic acid and glycine is 1:1.

[0012] Preferably, the water reducing agent is powder polycarboxylic acid water reducing agent.

[0013] Preferably, raw materials and weight fractions of the waterproofing agent are as follows: calcium oxide 40-60 parts, potassium aluminum sulfate 20-30 parts, magnesium oxide 5-10 parts, high water absorption resin powder 5-10 parts, high molecular organic silicon hydrophobic powder 5-10 parts, stearic acid 5-10 parts, hydrophobic micro-fine silica aerogel powder 50-60 parts, sodium silicate 10-15 parts, disodium ethylenediaminetetraacetate 8-16 parts, glycine 8-16 parts, magnesium lithium silicate 6-15 parts, fly ash 150-200 parts, silica ash 20-60 parts, water reducing agent 1-3 parts.

[0014] A preparation method of the concrete waterproofing agent, the method comprising: weighing raw materials according to weight fractions and stirring uniformly to obtain the concrete waterproofing agent.

[0015] The application of the concrete waterproofing agent of the present application, the concrete waterproofing agent is mixed with concrete and then stirred, poured, vibrated and maintained; wherein the addition amount of the concrete waterproofing agent is 3-5% of the mass of the glue material in the concrete.

[0016] Advantages

[0017] (1) The present application provides a concrete waterproofing agent, the waterproofing agent achieves excellent anti-permeation waterproofing effect and effectively improves the drying shrinkage of concrete, blocks the capillary pore structure of concrete and improves the strength and stability of concrete through the synergistic effect of each component of the raw material; the organosilane-modified hydrophobic micro-fine silica aerogel in the waterproofing agent raw material has high specific surface area, micron-level particle size and hydrophobic performance, which can not only block the capillary pores of concrete and improve the compactness and strength of concrete, but also further improve the waterproofing performance of concrete on the basis of the hydrophobic layer formed by the hydrophobic component; calcium oxide, potassium aluminum sulfate and magnesium oxide have a micro-expansion effect and can improve the capillary pore structure of concrete; fly ash and silica ash have good micro-powder filling effect and can reduce porosity and pore size and optimize the internal pore structure through chemical reaction, thereby improving the compactness of concrete and further improving the impermeability and durability of concrete.

[0018] (2) The present application provides a concrete waterproofing agent, the waterproofing agent has optimal anti-leakage impermeability and strength effect on concrete after the addition of the waterproofing agent through the determination of the content range of each component of the raw material; after the addition of the waterproofing agent with the content of the raw material and components, the permeation height of concrete is reduced from 52.1 mm to 11.3 mm, the cracking area is reduced from 1563.2 mm 2 / m 2 to 312.5 mm 2 / m 2 , the 7d and 28d compressive strengths are respectively improved from 21.6 MPa and 32.5 MPa to 26.3 MPa and 37.2 MPa, and the slump is improved from 225 mm to 235 mm.

[0019] (3) The present application provides a concrete waterproofing agent, high water-absorbing resin powder polyacrylamide is added to the waterproofing agent, the polyacrylamide has internal curing effect and can compensate for the drying shrinkage and self-shrinkage of concrete.

[0020] (4) The present application provides a concrete waterproofing agent, two different types of hydrophobic powders, high-molecular organic silicon hydrophobic powder and stearic acid, are added to the waterproofing agent, the hydrophobic active groups in the high-molecular organic silicon hydrophobic powder and stearic acid jointly form a hydrophobic layer, improve the anti-permeation waterproofing performance and waterproofing time of the waterproofing agent, and through the ratio of the two types of hydrophobic powders, it is found that when the mass ratio of the high-molecular organic silicon hydrophobic powder to stearic acid is 1:1, the waterproofing performance is optimal.

[0021] (5) The present application provides a kind of concrete waterproofing agent, reactive substance is generated by the reaction of sodium silicate, disodium ethylenediaminetetraacetate, glycine, magnesium lithium silicate added in the waterproofing agent, the reactive substance can react with cement hydration product in concrete to generate insoluble crystal, block concrete capillary pore channel and microcrack;And when the mass ratio of disodium ethylenediaminetetraacetate and glycine is 1:1, the effect of improving concrete strength is best.

[0022] (6) The present application provides a kind of preparation method of concrete waterproofing agent, the method is simple to operate, does not need special equipment, and the manufacturing cost is low, the production efficiency is high, construction and maintenance are convenient, can be widely used in concrete impermeable, waterproof construction in subway, port wharf, dam pool, tunnel, basement and other occasions. DETAILED DESCRIPTION

[0023] The present application will be further described below in conjunction with specific embodiments. The method is a conventional method unless otherwise specified, and the raw materials can be obtained from public commercial channels unless otherwise specified.

[0024] In the following examples:

[0025] High molecular organic silicon hydrophobic powder: Dow Chemical Company, model DOWSIL Z-6289Resin;

[0026] Silica aerogel powder: Shanghai Aladdin Biochemical Technology Co., Ltd., model S124038;

[0027] Powder polycarboxylic acid water reducing agent: Beijing Guangtong Hengye Technology Co., Ltd., model SK101.

[0028] Hydrophobic micro-fine silica aerogel is prepared by the following method: 1kg of silica aerogel is finely ground to a specific surface area greater than 100m 2 / g, and the amount of 45 μm square hole sieve residue is less than 10%, then 90g of n-octyl triethoxysilane is added, heated and stirred at 130℃ for 90min, separated and dried to obtain hydrophobic micro-fine silica aerogel powder.

[0029] Example 1

[0030] A kind of concrete waterproofing agent, the raw materials and weight fraction of the waterproofing agent are as follows: calcium oxide 40 parts, potassium aluminum sulfate 30 parts, magnesium oxide 10 parts, polyacrylamide 5 parts, high molecular organic silicon hydrophobic powder 5 parts, stearic acid 5 parts, hydrophobic micro-fine silica aerogel powder 50 parts, sodium silicate 10 parts, disodium ethylenediaminetetraacetate 8 parts, glycine 8 parts, magnesium lithium silicate 6 parts, fly ash 150 parts, silica ash 60 parts, powder polycarboxylic acid water reducing agent 1 part.

[0031] A preparation method of the concrete waterproofing agent is disclosed in the embodiment, the method comprises the following steps: measuring raw materials according to weight proportions, and stirring the raw materials uniformly by using a dry powder mixer to obtain the concrete waterproofing agent.

[0032] Embodiment 2

[0033] A concrete waterproofing agent, raw materials and weight proportions of the waterproofing agent are as follows: 50 parts of calcium oxide, 25 parts of potassium aluminum sulfate, 7 parts of magnesium oxide, 8 parts of polyacrylamide, 8 parts of high-molecular organic silicon hydrophobic powder, 8 parts of stearic acid, 54 parts of hydrophobic micro-fine silica aerogel powder, 13 parts of sodium silicate, 12 parts of disodium ethylenediaminetetraacetate, 12 parts of glycine, 11 parts of magnesium lithium silicate, 180 parts of fly ash, 40 parts of silica ash, and 2 parts of powder polycarboxylic acid water reducing agent.

[0034] A preparation method of the concrete waterproofing agent is disclosed in the embodiment, the method comprises the following steps: measuring raw materials according to weight proportions, and stirring the raw materials uniformly by using a dry powder mixer to obtain the concrete waterproofing agent.

[0035] Embodiment 3

[0036] A concrete waterproofing agent, raw materials and weight proportions of the waterproofing agent are as follows: 60 parts of calcium oxide, 20 parts of potassium aluminum sulfate, 5 parts of magnesium oxide, 10 parts of polyacrylamide, 10 parts of high-molecular organic silicon hydrophobic powder, 10 parts of stearic acid, 60 parts of hydrophobic micro-fine silica aerogel powder, 15 parts of sodium silicate, 16 parts of disodium ethylenediaminetetraacetate, 16 parts of glycine, 15 parts of magnesium lithium silicate, 200 parts of fly ash, 20 parts of silica ash, and 3 parts of powder polycarboxylic acid water reducing agent.

[0037] A preparation method of the concrete waterproofing agent is disclosed in the embodiment, the method comprises the following steps: measuring raw materials according to weight proportions, and stirring the raw materials uniformly by using a dry powder mixer to obtain the concrete waterproofing agent.

[0038] According to the standard JC 474-2008 Mortar, Concrete Waterproofing Agent, the concrete waterproofing agents prepared in Embodiments 1-3 are respectively added into concrete, the waterproofing agent is added in an amount of 4% of the mass of the binder in the concrete, to obtain concrete test samples 1-3, and the concrete without adding the concrete waterproofing agent is a concrete reference sample, the performance of the concrete test samples 1-3 and the concrete reference sample is tested, and the results are shown in Table 1.

[0039] Table 1 Performance test results of the concrete test samples 1-3 and the concrete reference sample

[0040]

[0041] The test results show that the penetration height and cracking area of the concrete sample added with the waterproof agent are obviously smaller than those of the concrete reference sample without the waterproof agent, which indicates that the waterproof agent has excellent waterproof performance; the 7d compressive strength, 28d compressive strength and slump of the concrete sample added with the waterproof agent are higher than those of the concrete reference sample without the waterproof agent, which indicates that the waterproof agent can significantly improve the stability of the concrete.

[0042] To sum up, the above is only a preferred embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A concrete waterproofing agent, characterized in that: The raw materials and weight proportions of the waterproofing agent are as follows: 40-60 parts of calcium oxide, 20-30 parts of potassium aluminum sulfate, 5-10 parts of magnesium oxide, 5-10 parts of super absorbent resin powder, 5-10 parts of polymer organic silicon hydrophobic powder, 5-10 parts of stearic acid, 50-60 parts of hydrophobic fine silica aerogel powder, 10-15 parts of sodium silicate, 8-16 parts of disodium edetate, 8-16 parts of glycine, 6-15 parts of lithium magnesium silicate, 150-200 parts of fly ash, 20-60 parts of silica fume, and 1-3 parts of a water reducer. Wherein, the super absorbent resin powder is polyacrylamide; The mass ratio of the polymer silicone hydrophobic powder and stearic acid is 1:1; The hydrophobic fine silica aerogel powder is prepared by the following method: grinding the silica aerogel to a specific surface area greater than 100 m 2 / g, a 45μm square mesh sieve residue of less than 10%, and then adding organic silane, heating at 90-130°C for 30-90min, and separating and drying; the organic silane is at least one of n-octyltriethoxysilane, propyltriethoxysilane and methyltriethoxysilane; the mass of the added organic silane is 6%-9% of the mass of the silica aerogel; The mass ratio of the disodium edetate to glycine is 1:

1.

2. A concrete waterproofing agent according to claim 1, characterized in that: The water reducer is a powdered polycarboxylate water reducer.

3. A method for preparing a concrete waterproofing agent according to claim 1 or 2, characterized in that: The method comprises the steps of weighing raw materials according to weight fractions and stirring the raw materials uniformly to obtain the concrete waterproofing agent.

4. Use of the concrete waterproofing agent according to claim 1 or 2, characterized in that: The concrete waterproofing agent is mixed with concrete and then stirred, poured, vibrated and cured; wherein the addition amount of the concrete waterproofing agent is 3% to 5% of the quality of the glue in the concrete.

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