Penetrating crystalline self-healing waterproof material for concrete self-waterproofing

Abstract

The application relates to the technical field of building materials, and discloses a permeable crystalline self-healing waterproof material for concrete self-waterproofing, which is prepared from the following raw materials in parts by weight: 20-30 parts of sodium-based bentonite, 20-50 parts of sodium methyl silicate, 4-6 parts of a penetrating agent, 8-12 parts of a sulphoaluminate cement, 15-18 parts of a silicone zirconium, and 2-5 parts of a complexing agent; the complexing agent is composed of 2-[3-(4-pentylphenyl)prop-2-enylamino]benzoic acid and sodium ethylenediaminetetraacetate. The above technical scheme solves the problem of low mechanical performance and waterproofness of concrete in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building materials, in particular to a permeable crystalline self-healing waterproof material for concrete self-waterproofing. BACKGROUND

[0002] With the rapid development of the construction industry, continuous innovation and upgrading, there are new requirements for the grade of underground waterproof engineering, GB 55030-2022 "General Specification for Waterproofing of Building and Municipal Engineering" clearly defines concrete as a waterproof layer in new construction projects. Higher requirements are put forward for the mechanical properties and waterproof performance of concrete. The original technology is to add simple waterproof agents (such as CaCl2, modified silicon, zirconium compounds, etc.) to improve the waterproof performance of concrete, but the waterproof grade of the concrete with waterproof performance obtained cannot meet the standard requirements. SUMMARY

[0003] The present application provides a permeable crystalline self-healing waterproof material for concrete self-waterproofing, which solves the problem of low mechanical properties and waterproof performance of concrete in the related art.

[0004] The technical scheme of the present application is as follows:

[0005] The present application provides a permeable crystalline self-healing waterproof material for concrete self-waterproofing, which includes the following components by weight: 20-30 parts of sodium bentonite, 20-50 parts of methyl sodium silicate, 4-6 parts of a penetrating agent, 8-12 parts of a sulphoaluminate cement, 15-18 parts of a silicone zirconium, and 2-5 parts of a complexing agent.

[0006] The complexing agent is composed of 2-[3-(4-pentylphenyl)prop-2-enylamino]benzoic acid and sodium ethylenediaminetetraacetate.

[0007] The permeable crystalline self-healing waterproof material for concrete self-waterproofing has the following characteristics: (1) strong permeability; (2) good water pressure resistance; (3) good crack resistance and good self-repairing ability; (4) long-term waterproof performance; (5) enhanced concrete compactness and high compressive strength; (6) strong corrosion resistance, aging resistance and protection of steel bars.

[0008] In the present application, sodium ethylenediaminetetraacetate will produce a complexation-precipitation reaction in the concrete during use. When cracks occur in the concrete, water enters the interior of the concrete from the cracks, and the active substance will react with the free Ca 2+The complex is generated, and once encountering the unhydrated cement particles in the cement, the silicate ions replace the active substances, and then generate insoluble crystalline to block the holes and cracks. 2+ The active substances of the cement-based permeable crystalline waterproof material become free radicals, and when the cracks are generated again, the active substances are activated, and the free Ca

[0009] As a further technical solution, the mass ratio of the 2-[3-(4-pentylphenyl)prop-2-enylamino]benzoic acid and sodium ethylenediaminetetraacetate is 3-7:1.

[0010] As a further technical solution, the mass ratio of the 2-[3-(4-pentylphenyl)prop-2-enylamino]benzoic acid and sodium ethylenediaminetetraacetate is 4:1.

[0011] As a further technical solution, the mass of the complexing agent is 8%-10% of the mass of sodium methyl silicate.

[0012] As a further technical solution, the mass of the complexing agent is 9% of the mass of sodium methyl silicate.

[0013] As a further technical solution, the penetrating agent comprises one or more of zinc sulfate, zirconium sulfate, and lithium sulfate.

[0014] The application further provides a preparation method of the permeable crystalline self-healing waterproof material for self-waterproofing of concrete.

[0015] As a further technical solution, the preparation method of the permeable crystalline self-healing waterproof material for self-waterproofing of concrete comprises the following steps: after the raw materials are uniformly mixed, the permeable crystalline self-healing waterproof material is obtained through crushing, grinding, and filtering.

[0016] The application further provides a use method of the permeable crystalline self-healing waterproof material for self-waterproofing of concrete.

[0017] The working principle and beneficial effects of the application are as follows:

[0018] 1. In this invention, the main component of sodium-based bentonite is SiO2. Sodium-based bentonite can be well integrated with silicate cement to produce expansive substances, which can compensate for shrinkage; it generates crystals to block cracks, further improving compactness and self-healing properties; sodium methylsilicate, as an effective component, can improve the compactness of concrete by hydrolysis and cross-linking with silicate components in concrete, and its exposed methyl groups can improve the water repellency of concrete; the innovative addition of zirconium silicate enables concrete to continuously heal, giving it a highly efficient self-healing function; aluminum sulfide... The addition of a small amount of acid cement can promote the hydration reaction of concrete and increase its density. The complexing agent is composed of 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and sodium ethylenediaminetetraacetate. The addition of sodium ethylenediaminetetraacetate can react with silicates to form precipitates and crystals, which can improve the impermeability and compressive strength of concrete. Moreover, the synergistic addition of sodium ethylenediaminetetraacetate and 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid can further improve the impermeability of the mixed soil and increase its compressive strength. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] In the following examples and comparative examples,

[0021] Sodium-based bentonite, product number 411, particle size 600 mesh, manufactured by Jilu Mineral Products Processing Plant in Lingshou County;

[0022] The sodium methylsilicate is designated as SN-1 and manufactured by Shandong Shuangniu Chemical Technology Co., Ltd.

[0023] Sulfoaluminate cement, PO 42.5, manufactured by Henan Haonai Building Materials Co., Ltd.

[0024] Example 1

[0025] A method for preparing a penetrating crystalline self-healing waterproofing material for concrete includes the following steps:

[0026] A penetrating crystalline self-healing waterproof material is obtained by mixing 20 parts of sodium bentonite, 20 parts of sodium methylsilicate, 4 parts of sodium hydroxide, 8 parts of sulfoaluminate cement, 15 parts of zirconium silicate, 1.5 parts of 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and 0.5 parts of sodium ethylenediaminetetraacetate evenly.

[0027] Example 2

[0028] A preparation method of a permeable crystalline self-healing waterproof material for concrete self-waterproofing, comprising the following steps:

[0029] After 25 parts of sodium bentonite, 40 parts of sodium methyl silicate, 5 parts of potassium hydroxide, 10 parts of sulphoaluminate cement, 17 parts of silicone zirconium, 3 parts of 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and 1 part of sodium ethylenediaminetetraacetate are uniformly mixed, a permeable crystalline self-healing waterproof material is obtained.

[0030] Example 3

[0031] A preparation method of a permeable crystalline self-healing waterproof material for concrete self-waterproofing, comprising the following steps:

[0032] After 30 parts of sodium bentonite, 50 parts of sodium methyl silicate, 6 parts of cyanuric chloride, 12 parts of sulphoaluminate cement, 18 parts of silicone zirconium, 3.75 parts of 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and 1.25 parts of sodium ethylenediaminetetraacetate are uniformly mixed, a permeable crystalline self-healing waterproof material is obtained.

[0033] Example 4

[0034] The difference between this embodiment and Example 1 is that 1.2 parts of 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and 0.4 parts of sodium ethylenediaminetetraacetate are added.

[0035] Example 5

[0036] The difference between this embodiment and Example 1 is that 1.35 parts of 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and 0.45 parts of sodium ethylenediaminetetraacetate are added.

[0037] Example 6

[0038] The difference between this embodiment and Example 1 is that 1.05 parts of 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and 0.35 parts of sodium ethylenediaminetetraacetate are added.

[0039] Example 7

[0040] The difference between this embodiment and Example 1 is that 1.65 parts of 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and 0.55 parts of sodium ethylenediaminetetraacetate are added.

[0041] Example 8

[0042] The difference between this embodiment and Example 1 is that 1.6 parts of 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and 0.4 parts of sodium ethylenediaminetetraacetate are added.

[0043] Example 9

[0044] This example differs from Example 1 only in that 1.75 parts of 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and 0.25 parts of sodium ethylenediaminetetraacetate are added.

[0045] Example 10

[0046] This example differs from Example 1 only in that 1.3 parts of 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and 0.7 parts of sodium ethylenediaminetetraacetate are added.

[0047] Example 11

[0048] This example differs from Example 1 only in that 1.7 parts of 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and 0.3 parts of sodium ethylenediaminetetraacetate are added.

[0049] Comparative Example 1

[0050] This comparative example differs from Example 1 only in that no 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and sodium ethylenediaminetetraacetate are added.

[0051] Comparative Example 2

[0052] This comparative example differs from Example 1 only in that no 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid is added.

[0053] Comparative Example 3

[0054] This comparative example differs from Example 1 only in that no sodium ethylenediaminetetraacetate is added.

[0055] The permeate crystalline self-healing waterproof materials obtained in Examples 1-11 and Comparative Examples 1-3 were determined for 28d compressive strength and 28d impermeable pressure according to the determination method in GB 18445-2012 "Cement-based permeate crystalline waterproof material", and the test results are shown in Table 1:

[0056] Table 1 Performance test results of permeate crystalline self-healing waterproof materials obtained in Examples 1-11 and Comparative Examples 1-3

[0057] 28d compressive strength (MPa) 28d impermeability pressure (MPa) Example 1 52.3 2.6 Example 2 53.1 2.8 Example 3 54.2 3.1 Example 4 51.6 2.5 Example 5 55.3 2.9 Example 6 51.2 2.2 Example 7 51.8 2.3 Example 8 58.4 3.2 Example 9 57.3 3.0 Example 10 49.3 2.0 Example 11 50.7 2.3 Comparative Example 1 42.2 1.1 Comparative Example 2 44.3 1.5 Comparative Example 3 48.8 1.8

[0058] Compared with Example 1, Examples 8-11 change the addition amount of 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and ethylenediaminetetraacetic acid sodium salt, and the results are that the compressive strength and the impermeable pressure in Examples 10-11 are lower than those in Example 1 and Examples 8-9, which indicates that when the mass ratio of 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and ethylenediaminetetraacetic acid sodium salt is 3-7:1, the impermeable pressure and the compressive strength of the concrete can be further improved, and the impermeable pressure and the compressive strength in Example 8 are higher than those in Example 1 and Example 9, which indicates that when the mass ratio of 2-[3-(4-pentylphenyl)prop-2-enoylamino]benzoic acid and ethylenediaminetetraacetic acid sodium salt is 4:1, the impermeable pressure and the compressive strength of the concrete can be further improved.

[0059] Compared with Example 1, Examples 4-7 change the mass ratio of the complexing agent and the mass of sodium methyl silicate, and the results are that the compressive strength and the impermeable pressure in Examples 6-7 are lower than those in Example 1 and Examples 4-5, which indicates that when the mass of the complexing agent is 8%-10% of the mass of sodium methyl silicate, the impermeable pressure and the compressive strength of the concrete can be further improved, and the compressive strength and the impermeable pressure in Example 5 are higher than those in Example 1 and Example 4, which indicates that when the mass of the complexing agent is 9% of the mass of sodium methyl silicate, the impermeable pressure and the compressive strength of the concrete can be further improved.

[0060] Compared with Example 1, Examples 4-7 change the mass ratio of the complexing agent and the mass of sodium methyl silicate, and the results are that the compressive strength and the impermeable pressure in Examples 6-7 are lower than those in Example 1 and Examples 4-5, which indicates that when the mass of the complexing agent is 8%-10% of the mass of sodium methyl silicate, the impermeable pressure and the compressive strength of the concrete can be further improved, and the compressive strength and the impermeable pressure in Example 5 are higher than those in Example 1 and Example 4, which indicates that when the mass of the complexing agent is 9% of the mass of sodium methyl silicate, the impermeable pressure and the compressive strength of the concrete can be further improved.

[0061] The above merely describes the preferred embodiments of the present application, but should not be used to limit the present application, and 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 permeable crystalline self-healing waterproof material for concrete self-waterproofing, characterized in that, The raw material comprises the following components by weight: 20-30 parts of sodium bentonite, 20-50 parts of sodium methyl silicate, 4-6 parts of penetrating agent, 8-12 parts of sulphoaluminate cement, 15-18 parts of silicone zirconium, and 2-5 parts of complexing agent; the complexing agent is composed of 2-[3-(4-pentylphenyl)prop-2-enylamino]benzoic acid and sodium ethylenediaminetetraacetate in a mass ratio of 3-7:

1.

2. A capillary crystalline self-healing waterproof material for self-waterproofing of concrete according to claim 1, characterized in that, The mass of the complexing agent is 8-10% of the mass of the sodium methyl silicate.

3. A capillary crystalline self-healing waterproof material for self-waterproofing of concrete according to claim 1, characterized in that, The penetrating agent comprises one or more of zinc sulfate, zirconium sulfate, and lithium sulfate.

4. The method according to any one of claims 1 to 3, characterized in that, The method comprises the following steps: uniformly mixing the raw material components to obtain a penetrating crystalline self-healing waterproof material.

5. A method of preparing a capillary crystalline self-healing waterproof material for self-waterproofing of concrete according to claim 4, characterized in that, The method comprises the following steps: uniformly mixing the raw material components, and then crushing, grinding, and filtering to obtain a penetrating crystalline self-healing waterproof material.

6. The use of a capillary crystalline self-healing waterproof material for self-waterproofing concrete according to any one of claims 1-3, characterized in that, The method comprises the following steps: The penetrating crystalline self-healing waterproof material is added to concrete, and the mass of the penetrating crystalline self-healing waterproof material is 1-3% of the mass of the concrete.