CN110105025B - Cement-based capillary crystalline waterproof material modified based on nano silicon-based material and preparation and application thereof - Google Patents
Cement-based capillary crystalline waterproof material modified based on nano silicon-based material and preparation and application thereof Download PDFInfo
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- CN110105025B CN110105025B CN201910531662.4A CN201910531662A CN110105025B CN 110105025 B CN110105025 B CN 110105025B CN 201910531662 A CN201910531662 A CN 201910531662A CN 110105025 B CN110105025 B CN 110105025B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention relates to a nano silicon-based material modified cement-based capillary crystalline waterproof material and a preparation method and application thereof, wherein the waterproof material comprises the following components in parts by weight: 45-65 parts of cement, 14-32 parts of quartz sand, 5-10 parts of retarder, 0.1-0.4 part of nano silicon-based material, 2-9 parts of crystallization precipitator, 0.5-5 parts of surfactant, 0.5-2 parts of complexing agent, 1-5 parts of calcium ion compensator, 0.5-2 parts of water reducer and 0.2-2 parts of cellulose ether. Compared with the prior art, the waterproof material is suitable for repairing the internal pore cracks of the concrete, when the cement-based material generates cracks (smaller than 0.4mm), insoluble sediments are generated in the cracks of the cement-based material under the water condition, and the cracks of the cement-based material are filled and sealed, so that the self-repairing of the cracks of the cement-based material is realized.
Description
Technical Field
The invention belongs to the technical field of building waterproof materials, and relates to a cement-based capillary crystalline waterproof material modified based on a nano silicon-based material, and preparation and application thereof.
Background
In recent years, the building industry in China is developed at a high speed, the building scale is increased continuously, but the generated building leakage problem is more and more, and related investigation shows that the house leakage problem is not optimistic, and most buildings have leakage of different degrees. The building leakage rate is the top floor (95%), the residential house (63.6%) and the underground space (57.4%) in sequence. According to the statistics of the construction department, more than half of the project quality complaints relate to the leakage problem of the building. The waterproof quality of buildings is influenced by a plurality of factors, and the waterproof quality of the buildings involves many aspects such as materials, design, construction, maintenance and management, and the parts such as roofs, basements, kitchens, toilets and the like which are easy to generate water accumulation are the key points of the waterproof of the buildings. At present, the maintenance of external walls, roofs, basements, kitchens, toilets and balconies is about 2.4 hundred million in China every year, and the cost is as high as more than 20 million yuan due to the use of various waterproof materials. If the leakage problem is not solved, the leakage loss caused by new buildings in future can not be estimated.
In water environments, such as house basements, municipal underground pipelines, road traffic tunnels, subway section tunnels, underground stations and the like, the reinforced concrete structure is usually subjected to micro-cracking due to factors such as unreasonable structural design, unreasonable concrete design, construction defects, insufficient maintenance and the like, so that the bearing capacity of the structure is reduced, and meanwhile, the micro-cracking accelerates the permeation of water and chloride ions and accelerates the corrosion of reinforcing steel bars. Therefore, how to improve the waterproof quality of the construction engineering structure becomes a difficult problem which puzzles the construction industry, and the construction waterproof technology and the waterproof material become important subjects which are researched by scientific researchers.
The cement-based permeable crystalline waterproof material can permeate into the cracks in the concrete through the concentration gradient of active substances per se in a water environment to be subjected to a crystallization precipitation reaction with unhydrated cement particles and calcium hydroxide generated by hydration, so that the hydration reaction is promoted, a large amount of needle-shaped crystals are generated to block the cracks in the concrete, and the aim of permanent waterproofing is fulfilled. Compared with other waterproof materials, the cement-based capillary crystalline waterproof material has stronger permeability, unique self-repairing capability, crack repairing and permanent waterproof effects, can effectively and quickly solve the leakage problem of buildings, and is a waterproof material with excellent waterproof performance.
Chinese patent CN102167547A discloses a novel cement-based capillary crystalline waterproof material for quickly repairing concrete microcracks. The addition of the mineral admixture to the cement-based waterproof material can promote the rapid growth of crystals, so that when cracks appear on a concrete matrix, the generated tiny cracks can be repaired within one week. However, the invention is only suitable for repairing the surface cracks of the concrete, and can not further permeate into the concrete, repair the cracks and improve the impermeability of the concrete, because the permeation and crystallization of the cement-based permeable crystalline waterproof material are interactive. For example, when the mineral admixture described in the patent is added, under the condition that surface cracks exist, active substances in the waterproof material can only rapidly repair the surface cracks and compact the surface pore cracks, so that the effect of temporary waterproofing is achieved, and the impermeability can not be further improved. Under the action of the surfactant, the surface potential energy of water is reduced, and active substances can better permeate into the concrete along with water under the action of concentration gradient to generate a penetration crystallization reaction, so that the waterproof and anti-permeability performance of a building is improved. Chinese patent CN107540304A discloses a composite cement-based permeable crystalline waterproof material. After the composite additive is added into a cement-based waterproof material, under the action of water, active chemical substances in the waterproof material have high permeability, so that unhydrated cement particles are promoted to generate hydration reaction to generate a large amount of needle crystals, and capillary channels are filled and sealed, so that cement concrete has an excellent waterproof and anti-permeability function.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a cement-based permeable crystallization type waterproof material modified based on a nano silicon-based material, and a preparation method and application thereof.
The purpose of the invention can be realized by the following technical scheme:
one of the technical schemes of the invention provides a nano silicon-based material modified cement-based capillary crystalline waterproof material, which is characterized by comprising the following components in parts by weight: 45-65 parts of cement, 14-32 parts of quartz sand, 5-10 parts of retarder, 0.1-0.4 part of nano silicon-based material, 2-9 parts of crystallization precipitator, 0.5-5 parts of surfactant, 0.5-2 parts of complexing agent, 1-5 parts of calcium ion compensator, 0.5-2 parts of water reducer and 0.2-2 parts of cellulose ether.
Furthermore, the cement is P.O.52.5 Portland cement, and the P.O.52.5 Portland cement can be selected specifically.
Further, the retarder is a mixture of citric acid and sodium carbonate, and the weight ratio of the citric acid to the sodium carbonate is 1: 1-2, adding. The sodium citrate generated by the reaction can adjust the hydration and setting time of the cement-based coating, improve the content of unhydrated cement particles, and facilitate that active substances do not react with the cement particles in the coating and further permeate into a concrete matrix for crystallization and precipitation to block pore cracks; meanwhile, sodium citrate can form a complex with calcium ions to provide calcium ions required by reaction for healing of pore cracks, and the more the sodium citrate is doped, the larger the amount of the stored calcium ions is, and the longer the calcium ions are, the crack repair is facilitated.
Further, the nano silicon-based material is one or more of powdery nano silicon dioxide, neutral silicon dioxide dispersion liquid or alkaline nano silicon dioxide dispersion liquid (the solid content of the nano silicon dioxide in the dispersion liquid is 10 wt% -30 wt%). The nano silicon dioxide has the advantages of small size effect, surface interface effect, quantum size effect, volume effect and the like, so that the nano silicon dioxide used as an active substance is doped into the cement-based permeable crystallization type waterproof material to further permeate into the concrete, the hydration reaction is promoted, and the generated gel repairs crack pores, so that the impermeability is improved, and the permanent waterproof effect is achieved.
Further, the crystallization precipitant is instant sodium silicate and/or sodium carbonate, and the weight ratio of the two is 1: 1-2, adding. Preferably, the modulus of the instant sodium silicate is 2.8 or 3.3. And the sodium carbonate is preferably one or more of heavy soda ash and light soda ash. The instant sodium silicate and the sodium carbonate can continuously react with calcium hydroxide generated by hydration reaction in the concrete to generate crystals and gel, so that pore cracks are filled, the content of the calcium hydroxide can be reduced, the hydration of unhydrated cement particles in the concrete is further promoted, and the strength and the impermeability of a matrix are improved.
Further, the surfactant is dodecyl ethoxy sulfobetaine or dodecyl sulfopropyl betaine. The surfactant can make two phases of water and concrete be regarded as components of the two phases through the affinity of different parts in molecules, so that the surface tension and the surface free energy are reduced. The active substance can be more easily infiltrated into the concrete to a certain depth along with the moisture under the concentration gradient, so as to achieve the purposes of compacting concrete pore cracks by crystallization and improving water resistance and impermeability.
Further, the complexing agent is one or more of levotartaric acid, dextrotartaric acid, meso-tartaric acid, disodium levotartrate dihydrate, ethylenediaminetetraacetic acid, disodium ethylenediaminetetraacetate or tetrasodium ethylenediaminetetraacetate. The complexing agent is added into the cement-based material, when the concrete matrix cracks and leaks water, the complexing agent and calcium ions form a complex in the water environment, and the complex is diffused into accumulated water of concrete pore cracks and is in a reaction type SiO3 2-Where present, due to solubilityDifferential formation of insoluble CaSiO3And precipitating the complex ions into the pores of the concrete, diffusing the split complex ions again, and continuously carrying out complexation-precipitation reaction to repair the crack pores of the concrete matrix. When the matrix is in a dry state, the complexing agent is in a dormant state; when the matrix leaks water again, the complexing agent is activated again to repair the concrete matrix, thereby improving the waterproof and anti-permeability performance of the concrete matrix.
Further, the calcium ion compensator is slaked lime;
the water reducing agent is an early-strength polycarboxylate water reducing agent.
The second technical scheme of the invention provides a preparation method of a cement-based permeable crystalline waterproof material modified based on a nano silicon-based material, which is characterized in that all raw materials are mixed with water and stirred uniformly to obtain a coating-like substance, and the coating-like substance is coated on the surface of cement concrete to obtain a target product.
After the waterproof material acts with water, the active chemical substance has strong permeability, can deeply permeate into the concrete structure by taking water as a carrier, promotes unhydrated cement to react in the internal pores of the concrete to generate a large amount of needle-shaped crystals, quickly fills capillary channels and micro-gaps, permeates into the concrete, and improves the compactness and the waterproofness of the concrete.
The third technical scheme of the invention provides application of the cement-based permeable crystalline waterproof material modified based on the nano silicon-based material in hydraulic engineering, marine engineering concrete structures or underground concrete structures.
The active substances in the cement-based permeable crystallization type waterproof material can migrate to concrete cracking and pore positions for crystallization reaction through concentration difference in a water environment, a large amount of needle-shaped crystals are quickly generated to repair the concrete, a permanent waterproof effect is required, and the waterproof performance and durability of the concrete are improved. Not only has lower cost, but also has the advantages of no pollution, no public nuisance, simple operation and the like. Meanwhile, the using effect is more obvious than that of other products on the market.
Compared with the prior art, the invention has the following advantages:
(1) using nano silicon dioxide as a nano silicon-based modified material: with the continuous improvement of concrete technology, concrete is more and more dense, the permeation of the traditional cement-based permeable crystalline material in the concrete is reduced, and the waterproof and anti-permeability capability of a building cannot be obviously improved. Because the nano silicon dioxide has the superior characteristics of small size effect, surface interface effect, quantum size effect, volume effect and the like, the nano silicon dioxide which is used as an active substance is added into the cement-based permeable crystalline waterproof material to further go deep into the concrete to generate crystallization reaction, so that the impermeability of the material is improved. Because the nano-silica has higher cost and can generate alkali-aggregate reaction when the doping amount is too large, the volume is increased by a high factor, unnecessary expansion is caused, and a matrix is damaged, so that the obvious effect can be achieved by doping a small amount of nano-silica and other crystallization precipitants to be mutually matched for use.
(2) Dodecyl ethoxy sulfobetaine and the like are used as surfactants: the surfactant dodecyl ethoxy sulfobetaine is an amphoteric surfactant, can be dissolved under alkaline conditions and acidic conditions, and thus the pH range of cement base is expanded. The dodecyl ethoxy sulfobetaine is used as the surfactant, so that the two phases can be regarded as the components of the phase through the affinity of different parts in the molecules to the two phases of water and concrete respectively, the molecules are arranged between the two phases, the surfaces of the two phases are equivalently transferred into the molecules, and the two phases are equivalently regarded as one component of the phase, so that the two phases are equivalently that no interface is formed between the two phases and the surfactant molecules, thereby reducing the surface tension and the surface free energy. Therefore, the active substance can more easily permeate into the concrete to a certain depth along with the moisture under the concentration gradient, so as to achieve the purposes of compacting concrete pore cracks by crystallization and improving water resistance and impermeability.
(3) Citric acid and sodium carbonate were used in combination: adding citric acid and sodium carbonate, and reacting to generate sodium citrate and CO while adding water and stirring2And release a large amount of heat, when the temperature in the waterproof material is higher, the reaction of the active substanceThe reactivity is also improved, and at the same time, CO2When the concrete is discharged, partial air holes are generated, which is more helpful for the permeation crystallization reaction of active substances to the interior of the concrete under the condition of water, and the impermeability of the concrete is improved. The generated sodium citrate also has the function of retarding coagulation, and CO is generated in the reaction in the cement-based soil layer2After the discharge and the reaction heat dissipation, the coating is gradually slowly hydrated, so that the gradual compaction of the cement-based permeable crystalline waterproof material coating is achieved, and a layer of protection is provided for water resistance and impermeability.
Detailed Description
The present invention will be described in detail with reference to specific examples. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1
A cement-based permeable crystallization type waterproof material is composed of the following raw materials in parts by weight:
45 parts of Portland cement;
31.4 parts of quartz sand;
4 parts of citric acid;
12 parts of sodium carbonate;
3 parts of instant sodium silicate;
0.4 part of nano silicon dioxide;
0.5 part of a surfactant;
0.5 part of tartaric acid;
1 part of calcium ion compensator;
2 parts of a polycarboxylic acid water reducing agent;
0.2 part of cellulose ether;
the quartz sand is obtained by compounding 40-70 meshes, 70-100 meshes and 100-140 meshes, and the compounding weight ratio is 1:2: 1; the surfactant is dodecyl ethoxy sulfobetaine; a hydroxyethyl methyl cellulose ether having a viscosity of 200 to 1500 mPas.
Example 2
A cement-based permeable crystallization type waterproof material is composed of the following raw materials in parts by weight:
55 parts of Portland cement;
27 parts of quartz sand;
3 parts of citric acid;
7 parts of sodium carbonate;
1 part of instant sodium silicate;
0.4 part of nano silicon dioxide;
1.1 parts of a surfactant;
1.5 parts of tartaric acid;
1 part of calcium ion compensator;
2 parts of a polycarboxylic acid water reducing agent;
1 part of cellulose ether;
the quartz sand is obtained by compounding 40-70 meshes, 70-100 meshes and 100-140 meshes, and the compounding weight ratio is 1:2: 1; the surfactant is dodecyl sulfopropyl betaine; a hydroxyethyl methyl cellulose ether having a viscosity of 200 to 1500 mPas.
Example 3
A cement-based permeable crystallization type waterproof material is composed of the following raw materials in parts by weight:
60 parts of Portland cement;
18.5 parts of quartz sand;
4 parts of citric acid;
10 parts of sodium carbonate;
3 parts of instant sodium silicate;
0.1 part of nano silicon dioxide;
0.5 part of a surfactant;
0.5 part of tartaric acid;
2 parts of calcium ion compensator;
1 part of a polycarboxylic acid water reducing agent;
0.4 part of cellulose ether;
the quartz sand is obtained by compounding 40-70 meshes, 70-100 meshes and 100-140 meshes, and the compounding weight ratio is 1:2: 1; the surfactant is dodecyl ethoxy sulfobetaine or dodecyl sulfopropyl betaine; a hydroxyethyl methyl cellulose ether having a viscosity of 200 to 1500 mPas.
Example 4
A cement-based permeable crystallization type waterproof material is composed of the following raw materials in parts by weight:
65 parts of Portland cement;
14.3 parts of quartz sand;
2 parts of citric acid;
3 parts of sodium carbonate;
1 part of instant sodium silicate;
0.2 part of nano silicon dioxide;
5 parts of a surfactant;
2 parts of tartaric acid;
5 parts of a calcium ion compensator;
0.5 part of a polycarboxylic acid water reducing agent;
2 parts of cellulose ether;
the quartz sand is obtained by compounding 40-70 meshes, 70-100 meshes and 100-140 meshes, and the compounding weight ratio is 1:2: 1; the surfactant is dodecyl ethoxy sulfobetaine or dodecyl sulfopropyl betaine; a hydroxyethyl methyl cellulose ether having a viscosity of 200 to 1500 mPas.
Example 5
Compared with the embodiment 4, most of the materials are the same, except that the nano silicon dioxide of the waterproof material in the embodiment is changed into instant sodium silicate, which is composed of the following raw materials in parts by weight:
65 parts of Portland cement;
14.3 parts of quartz sand;
2 parts of citric acid;
3 parts of sodium carbonate;
1.2 parts of instant sodium silicate;
5 parts of a surfactant;
2 parts of tartaric acid;
5 parts of a calcium ion compensator;
0.5 part of a polycarboxylic acid water reducing agent;
2 parts of cellulose ether;
the quartz sand is obtained by compounding 40-70 meshes, 70-100 meshes and 100-140 meshes, and the compounding weight ratio is 1:2: 1; the surfactant is dodecyl ethoxy sulfobetaine or dodecyl sulfopropyl betaine; a hydroxyethyl methyl cellulose ether having a viscosity of 200 to 1500 mPas.
Example 6
Compared with the embodiment 4, most of the materials are the same, except that the citric acid and sodium carbonate system of the waterproof material in the embodiment is changed into a sodium citrate system, and the waterproof material is composed of the following raw materials in parts by weight:
65 parts of Portland cement;
14.3 parts of quartz sand;
2 parts of sodium citrate;
1 part of sodium carbonate;
1 part of instant sodium silicate;
0.2 part of nano silicon dioxide;
5 parts of a surfactant;
2 parts of tartaric acid;
5 parts of a calcium ion compensator;
0.5 part of a polycarboxylic acid water reducing agent;
2 parts of cellulose ether;
the quartz sand is obtained by compounding 40-70 meshes, 70-100 meshes and 100-140 meshes, and the compounding weight ratio is 1:2: 1; the surfactant is dodecyl ethoxy sulfobetaine and dodecyl sulfopropyl betaine (the mass ratio is 1: 1); a hydroxyethyl methyl cellulose ether having a viscosity of 200 to 1500 mPas.
Example 7
Compared with the embodiment 4, most of the surfactant is the same except that the surfactant of the waterproof material in the embodiment is sodium dodecyl benzene sulfonate instead of dodecyl ethoxy sulfobetaine or dodecyl sulfopropyl betaine, and the surfactant is composed of the following raw materials in parts by weight:
65 parts of Portland cement;
14.3 parts of quartz sand;
2 parts of sodium citrate;
1 part of sodium carbonate;
1 part of instant sodium silicate;
0.2 part of nano silicon dioxide;
5 parts of a surfactant;
2 parts of tartaric acid;
5 parts of a calcium ion compensator;
0.5 part of a polycarboxylic acid water reducing agent;
2 parts of cellulose ether;
the quartz sand is obtained by compounding 40-70 meshes, 70-100 meshes and 100-140 meshes, and the compounding weight ratio is 1:2: 1; the surfactant is sodium dodecyl benzene sulfonate; a hydroxyethyl methyl cellulose ether having a viscosity of 200 to 1500 mPas.
The cement-based capillary crystalline waterproofing materials of examples 1 to 7 were subjected to performance tests, and the results are shown in Table 1.
TABLE 1 test results of various properties of cement-based capillary crystalline waterproof material
In order to support the superiority of the invention in performance compared with other patents of cement-based permeable crystalline waterproof material, the invention is compared with the aforementioned patents of several inventions under the same conditions for impermeability tests, and the results are shown in table 2.
TABLE 2 comparison of Performance indicators for inventive example 2 and the published patent section
Note: comparative patent 1 was CN102167547A, comparative patent 2 was CN106946518A, comparative patent 3 was CN104609801A, and comparative patent 4 was CN 107540304.
Comparative example 1
A cement-based permeable crystallization type waterproof material is composed of the following raw materials in parts by weight:
55.4 parts of Portland cement;
27 parts of quartz sand;
3 parts of citric acid;
7 parts of sodium carbonate;
1 part of instant sodium silicate;
1.1 parts of a surfactant;
1.5 parts of tartaric acid;
1 part of calcium ion compensator;
2 parts of a polycarboxylic acid water reducing agent;
1 part of cellulose ether;
the quartz sand is obtained by compounding 40-70 meshes, 70-100 meshes and 100-140 meshes, and the compounding weight ratio is 1:2: 1; the surfactant is dodecyl sulfopropyl betaine; a hydroxyethyl methyl cellulose ether having a viscosity of 200 to 1500 mPas.
Comparative example 2
A cement-based permeable crystallization type waterproof material is composed of the following raw materials in parts by weight:
56.1 parts of Portland cement;
27 parts of quartz sand;
3 parts of citric acid;
7 parts of sodium carbonate;
1 part of instant sodium silicate;
0.4 part of nano silicon dioxide;
1.5 parts of tartaric acid;
1 part of calcium ion compensator;
2 parts of a polycarboxylic acid water reducing agent;
1 part of cellulose ether;
the quartz sand is obtained by compounding 40-70 meshes, 70-100 meshes and 100-140 meshes, and the compounding weight ratio is 1:2: 1; a hydroxyethyl methyl cellulose ether having a viscosity of 200 to 1500 mPas.
Comparative example 3
A cement-based permeable crystallization type waterproof material is composed of the following raw materials in parts by weight:
56.5 parts of Portland cement;
27 parts of quartz sand;
3 parts of citric acid;
7 parts of sodium carbonate;
1 part of instant sodium silicate;
1.5 parts of tartaric acid;
1 part of calcium ion compensator;
2 parts of a polycarboxylic acid water reducing agent;
1 part of cellulose ether;
the quartz sand is obtained by compounding 40-70 meshes, 70-100 meshes and 100-140 meshes, and the compounding weight ratio is 1:2: 1; a hydroxyethyl methyl cellulose ether having a viscosity of 200 to 1500 mPas.
As can be seen from tables 1 and 2, the cement-based permeable crystalline waterproof material modified based on the nano silicon-based material according to the present invention can significantly improve the waterproof and anti-permeability performance of a concrete or mortar matrix, and when the matrix cracks and seeps water, active substances in the waterproof material act to repair the crack and pores of the matrix through permeable crystallization. Compared with the published patent, the formula of the invention is obviously superior to other products in the market in the aspects of secondary impermeability, active substance permeability, crystallinity, crack repair, durability and the like because the nano silicon-based material is added, and particularly, the innovation point of the product is that the nano silicon-based modified material, the surfactant and the like are used for improving the waterproof repair effect of the product.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (6)
1. A cement-based permeable crystallization type waterproof material modified based on a nano silicon-based material is characterized by comprising the following components in parts by weight: 45-65 parts of cement, 14-32 parts of quartz sand, 5-10 parts of retarder, 0.1-0.4 part of nano silicon-based material, 2-9 parts of crystallization precipitator, 0.5-5 parts of surfactant, 0.5-2 parts of complexing agent, 1-5 parts of calcium ion compensator, 0.5-2 parts of water reducer and 0.2-2 parts of cellulose ether;
the retarder is a mixture of citric acid and sodium carbonate, and the citric acid and the sodium carbonate are mixed according to the weight ratio of 1: 1-2, adding;
the nano silicon-based material is one or more of powdery nano silicon dioxide, neutral silicon dioxide dispersion liquid or alkaline nano silicon dioxide dispersion liquid, and the solid content of the nano silicon dioxide in the alkaline nano silicon dioxide dispersion liquid is 10-30 wt%;
the surfactant is dodecyl ethoxy sulfobetaine or dodecyl sulfopropyl betaine;
the complexing agent is one or more of levotartaric acid, dextrotartaric acid, meso-tartaric acid, disodium levotartrate dihydrate, ethylenediamine tetraacetic acid, disodium ethylenediamine tetraacetic acid or tetrasodium ethylenediamine tetraacetic acid.
2. The nano silicon-based material modified cement-based permeable crystalline waterproof material as claimed in claim 1, wherein the cement is P.O.52.5 Portland cement.
3. The cementitious capillary crystalline waterproofing material based on modification of nano-silica based materials according to claim 1 wherein the crystallization precipitant is instant sodium silicate and/or sodium carbonate.
4. The nano silicon-based material modified cement-based permeable crystalline waterproof material as claimed in claim 1, wherein the calcium ion compensator is slaked lime;
the water reducing agent is an early-strength polycarboxylate water reducing agent.
5. The preparation method of the nano silicon-based material modified cement-based capillary crystalline waterproof material as claimed in any one of claims 1 to 4, wherein the target product is obtained by adding water to all the raw materials and uniformly stirring to obtain a coating-like substance and then coating the coating-like substance on the surface of cement concrete.
6. Use of the nano silicon-based material modified cement-based permeable crystalline waterproof material as claimed in any one of claims 1 to 4 in a hydraulic or marine concrete structure or an underground concrete structure.
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