CN103804021A - Reaction in-situ type concrete protective agent with self-cleaning function - Google Patents
Reaction in-situ type concrete protective agent with self-cleaning function Download PDFInfo
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- CN103804021A CN103804021A CN201310721655.3A CN201310721655A CN103804021A CN 103804021 A CN103804021 A CN 103804021A CN 201310721655 A CN201310721655 A CN 201310721655A CN 103804021 A CN103804021 A CN 103804021A
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- cleaning function
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Abstract
The invention relates to a reaction in-situ type concrete protective agent with a self-cleaning function, belonging to the field of building materials, and particularly relates to a method for protecting surface hardened concrete by ethyl orthosilicate modified nano TiO2. The concrete protective agent provided by the invention comprises the following raw materials in percentage by weight: 10-50% of ethyl orthosilicate, 0-10% of a silane coupling agent, 3-15% of nano TiO2 and 25-87% of water. By means of the character that ethyl orthosilicate in the raw material of the protective agent permeates into surface holes of the hardened concrete and is hydrolyzed in situ to generate nano SiO2, the nano SiO2 has the pozzolanic reaction under an alkaline environment of the surface holes of the hardened concrete, so as to compactly protect the surface of the concrete. The nano TiO2 compounded with ethyl orthosilicate through the coupling agent can be effectively attached to the surface hardened concrete so as to endow the concrete surface with the self-cleaning function. Meanwhile, the physical hole blocking effect of the nano TiO2 particles can further improve the compactness of the surface concrete. The protective agent provided by the invention has the characteristics of less raw material components, convenience in construction and the like, and can be widely applied to protecting and beautifying the hardened concrete surface.
Description
Technical field
The invention belongs to building material technical field, particularly utilize the nano-TiO of tetraethoxy modification
2the method that top layer maturing is protected.
Background technology
Concrete structure is subject to the factor effects such as water, gas, the temperature difference, stress in environment, skin-material performance degradation is its reason that causes structure reduction in work-ing life, and being subject to environmental pollutant adsorption, structure visual appearance reduces the major reason that also affects its structure aesthetic feeling.The quality of top layer concrete quality directly affects the size of the anti-deteriorated ability of one-piece construction, improves by improving top layer concrete quality the research directions that one-piece construction performance is the long-term concern of people.In addition, concrete cleanliness factor in top layer is also the principal element that affects structure outward appearance U.S. degree.Adopting the method for external protective layer to improve top layer concrete quality is conventional technical measures, and is also the means that generally adopt at the abstersive functional materials layer of concrete surface layer brushing tool.
Concrete shield is mainly divided into organic protection coating and inorganic protective layer.Organic protection coating mainly forms continuous film by organic membrane-forming agent at concrete surface, hinders hazardous medium, is mainly that water, gas medium infiltrate inside concrete.And according to top layer protective mechanism, organic protection coating is divided into silicane protective agent and filming emulsion protective agent, the former is mainly by forming film at top layer concrete pore, change hole wetting ability, make moisture be difficult to infiltrate hole and do not affect gaseous interchange inside and outside concrete, latter is by forming continuous film at concrete surface layer, and all substances of blocking-up concrete and environment exchange.The topmost problem of this class protective agent is that the weathering resistance of organic constituent is poor; Inorganic protective layer is mainly to form sealing ply by inorganic materials at concrete surface, as crystal type protective layer, its major function component is alkalimetal silicate, although effectively air free concrete structure, the alkalimetal ion that reaction generates is obviously disadvantageous to problems such as concrete alkali aggregate reaction, metal-salt crystallizatioies.For top layer self-cleaning function, people adopt the nano-TiO with photocatalysis effect conventionally
2realize.Existing related invention patent is as follows:
Application number is CN200910214021.2's " a kind of concrete compound protection method and concrete deep layer sealant " patent, and disclosed this protective material is by nano-TiO
2, nanometer SiO
2, nanometer CaCO
3, the composition such as nano-silicon, distilled water and trace active catalyzer.The related material component of this patent is many, and is mainly to utilize nano particle to fill plug-hole to be used for closely knit pore structure, and these protect components and the bonding not firm of concrete substrate is the major defect that affects its sealing effectiveness." a kind of environment-friendly aqueous nanometer coating material for concrete protection and preparation method thereof " patent that and for example application number is CN201310222115.0, the composition of disclosed environment-friendly aqueous nanometer coating material includes machine silane coupling agent 15%～65%; Nano silicon 0.5%～10%; Nano titanium oxide 0.5%～5%; Silicone oligomer 0.4%～4%; Emulsifying agent 0.3%～3%; The anti-algae agent 0.1%～0.6% of sterilization; Conditioning agent 0.01%～0.1%; Surplus is deionized water.The material component that this patent is announced has 8 kinds more than, and the existence of organic constituent makes coating material weather resistance deficiency." foamed concrete of a kind of nitrogen-doped titanium dioxide and preparation method thereof " patent that and for example application number is CN201210000305.3, disclosed foamed concrete is to be made up according to a certain weight ratio of following raw materials according: ordinary Portland cement, flyash, foam, water reducer, tap water and nitrogen-doped titanium dioxide.The material that this patent is announced is only for foamed concrete, and popularity and suitability are not high.
Nanometer SiO
2generally refer to particle diameter be several nanometers to the armorphous nano particle between 100nm, and its presoma is preparation nanometer SiO
2silicon source, common as tetraethoxy or other silicon source, wait chemical reaction to generate nano particle by hydrolysis under certain condition, the Organic Alcohol producing after hydrolysis is easy to volatilization.As the active high material of a kind of pozzolanic reaction, nanometer SiO
2absorb fast the Ca (OH) that in concrete, hydrated reaction of cement generates
2, generating aquation gel is its important foundation for cement concrete.
Utilize nanometer SiO
2outstanding pozzolanic reaction activity; numerous results of study show that it has the effect of remarkable solid cement concrete structure; become one of important method of cement-based material modification; but when the feed composition that sets it as production cement concrete mixes, the increase of the material cost of bringing when larger volume and dispersion difficulty is also unfavorable for its mass-producing application.Only at top layer brushing nanometer SiO
2, top layer aquation amount directly affects closely knit effect.The nanometer SiO that utilizes precursor in situ hydrolysis to generate
2there is more high reactivity, and presoma is more easily in top layer infiltration, is beneficial to the raising of closely knit effect.Detitanium-ore-type or rutile type nano TiO
2particle all has photocatalysis effect, can effectively reduce concrete structure pollution of surface thing adhesion amount.Because its photocatalysis is only in top layer concrete performance, inside mix in concrete obviously improperly, and the raising of brushing its sticking power on the concrete of top layer will determine the time limit of its action effect.
Summary of the invention
The object of the invention is to utilize tetraethoxy to act on maturing top layer, in-situ hydrolysis product and hydrolysis product of cement Ca (OH)
2there is pozzolanic reaction and generate the next closely knit top layer of aquation gel concrete structure, and utilize coupling agent by tetraethoxy and nano-TiO
2link, improves TiO
2the concrete adsorptive power on top layer, reaches and promotes concrete surface layer degree of compactness, and the effect of giving concrete self-cleaning function.The present invention has the features such as protective agent component is few, easy construction, materials'use amount is few, the automatically cleaning effect hold-time is long.
The technical scheme that realizes the object of the invention is: a kind of reaction in－situ type concrete protectant with self-cleaning function, and its protective material component and mass percent thereof are:
Tetraethoxy: 10～50%
Silane coupling agent: 0～10%
Nano-TiO
2: 3～15%
Water: 25～87%.
A kind of reaction in－situ type concrete protectant with self-cleaning function: with tetraethoxy, silane coupling agent, nano-TiO
2and water is raw material, first take starting material, then 60 ~ 80
oheated and stirred 2 hours under C water bath condition, controlling reacting solution pH value is 2 ~ 3, after reaction finishes, obtains protective liquid.The protective liquid that is cooled to room temperature is carried out to construction of prevention work by the mode of spraying to the concrete surface that carries out clean, and spraying application repeats 3 times, and every minor tick 20 minutes is fully soaked and is advisable with top layer concrete while spraying at every turn.
The present invention adopts after technique scheme, mainly possesses following characteristics:
1, tetraethoxy has higher perviousness, can effectively infiltrate in the concrete of top layer, is beneficial to the performance of protective effect;
2, the nanometer SiO that tetraethoxy in-situ hydrolysis generates
2higher pozzolanic activity is beneficial to the closely knit filling effect of its his-and-hers watches layer concrete, and the product that original position pozzolanic reaction generates is consistent with hydrolysis product of cement, is beneficial to the persistence of protection;
3, nano-TiO
2compound through coupling agent and tetraethoxy, make it more can effectively be attached to concrete surface layer, thereby improve more targetedly its photocatalysis effect.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
embodiment 1
A reaction in－situ type concrete protectant with self-cleaning function, its protective material component and mass percent thereof are:
Tetraethoxy: 10%
Silane coupling agent: 0%
Nano-TiO
2: 3%
Water: 87%
embodiment 2
A reaction in－situ type concrete protectant with self-cleaning function, its protective material component and mass percent thereof are:
Tetraethoxy: 50%
Silane coupling agent: 10%
Nano-TiO
2: 15%
Water: 25%
embodiment 3
A reaction in－situ type concrete protectant with self-cleaning function, its protective material component and mass percent thereof are:
Tetraethoxy: 30%
Silane coupling agent: 5%
Nano-TiO
2: 10%
Water: 55%
test-results
With the water cement ratio that embodiment 1 and 3 processes be 0.6, the maturing that 28 days ultimate compression strength is 45.1MPa, normal curing 28 days, concrete surface layer is measured 24 hours water-intake rates after processing after 14 days in standard curing room maintenance, and sample photocatalytic degradation ability to methylene blue under ultraviolet lighting condition before and after test processes, the photodegradation time is 24 hours, and result is as follows:
As can be known from the above table, utilize tetraethoxy modified Nano TiO
2maturing top layer is processed, can significantly improve top layer concrete density, reduce concrete water-intake rate, can give concrete with photocatalysis performance simultaneously.Therefore, the present invention can effectively improve concrete durability and aesthetic property, and the raw materials used component of the present invention is few, the feature such as simple of constructing.
Claims (4)
1. there is a reaction in－situ type concrete protectant for self-cleaning function, it is characterized in that the component of its raw material and mass percent thereof are:
Tetraethoxy: 10～50%
Silane coupling agent: 0～10%
Nano-TiO
2: 3～15%
Water: 25～87%.
2. according to a kind of reaction in－situ type concrete protectant with self-cleaning function claimed in claim 1, it is characterized in that the component of its raw material and mass percent thereof are:
Tetraethoxy: 10%
Silane coupling agent: 0%
Nano-TiO
2: 3%
Water: 87%.
3. according to a kind of reaction in－situ type concrete protectant with self-cleaning function claimed in claim 1, it is characterized in that the component of its raw material and mass percent thereof are:
Tetraethoxy: 50%
Silane coupling agent: 10%
Nano-TiO
2: 15%
Water: 25%.
4. according to a kind of reaction in－situ type concrete protectant with self-cleaning function claimed in claim 1, it is characterized in that the component of its raw material and mass percent thereof are:
Tetraethoxy: 30%
Silane coupling agent: 5%
Nano-TiO
2: 10%
Water: 55%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310721655.3A CN103804021A (en) | 2013-12-24 | 2013-12-24 | Reaction in-situ type concrete protective agent with self-cleaning function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310721655.3A CN103804021A (en) | 2013-12-24 | 2013-12-24 | Reaction in-situ type concrete protective agent with self-cleaning function |
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| CN103804021A true CN103804021A (en) | 2014-05-21 |
Family
ID=50701466
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|---|---|---|---|
| CN201310721655.3A Pending CN103804021A (en) | 2013-12-24 | 2013-12-24 | Reaction in-situ type concrete protective agent with self-cleaning function |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108546054A (en) * | 2018-07-26 | 2018-09-18 | 北京宝辰联合科技股份有限公司 | Permeable face layer mortar of a kind of high-strength automatically cleaning and preparation method thereof |
| CN110304879A (en) * | 2019-06-28 | 2019-10-08 | 济南大学 | A kind of method making concrete with water body purification function and the concrete with water body purification function |
| CN110655417A (en) * | 2019-10-12 | 2020-01-07 | 山东大学 | Composite nano material protective agent and method for protecting concrete surface by using same |
| CN113636782A (en) * | 2021-09-03 | 2021-11-12 | 山东高速集团有限公司创新研究院 | Modified nano protective agent and preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103275616A (en) * | 2013-06-06 | 2013-09-04 | 江苏博特新材料有限公司 | Environment-friendly water-based nano coating material used for concrete protection, and preparation method thereof |
| CN103435366A (en) * | 2013-06-06 | 2013-12-11 | 济南大学 | In-situ reaction type concrete protective agent |
-
2013
- 2013-12-24 CN CN201310721655.3A patent/CN103804021A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103275616A (en) * | 2013-06-06 | 2013-09-04 | 江苏博特新材料有限公司 | Environment-friendly water-based nano coating material used for concrete protection, and preparation method thereof |
| CN103435366A (en) * | 2013-06-06 | 2013-12-11 | 济南大学 | In-situ reaction type concrete protective agent |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108546054A (en) * | 2018-07-26 | 2018-09-18 | 北京宝辰联合科技股份有限公司 | Permeable face layer mortar of a kind of high-strength automatically cleaning and preparation method thereof |
| CN108546054B (en) * | 2018-07-26 | 2023-12-26 | 北京宝辰联合科技股份有限公司 | High Jiang Ziqing clean water surface layer mortar and preparation method thereof |
| CN110304879A (en) * | 2019-06-28 | 2019-10-08 | 济南大学 | A kind of method making concrete with water body purification function and the concrete with water body purification function |
| CN110655417A (en) * | 2019-10-12 | 2020-01-07 | 山东大学 | Composite nano material protective agent and method for protecting concrete surface by using same |
| CN113636782A (en) * | 2021-09-03 | 2021-11-12 | 山东高速集团有限公司创新研究院 | Modified nano protective agent and preparation method and application thereof |
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Application publication date: 20140521 |