CN108894121B - Hydrophobic strong-dipping-layer protection structure for preventing concrete from carbonization - Google Patents
Hydrophobic strong-dipping-layer protection structure for preventing concrete from carbonization Download PDFInfo
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- CN108894121B CN108894121B CN201810397023.9A CN201810397023A CN108894121B CN 108894121 B CN108894121 B CN 108894121B CN 201810397023 A CN201810397023 A CN 201810397023A CN 108894121 B CN108894121 B CN 108894121B
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- 238000003763 carbonization Methods 0.000 title claims abstract description 31
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 22
- MSRJTTSHWYDFIU-UHFFFAOYSA-N octyltriethoxysilane Chemical compound CCCCCCCC[Si](OCC)(OCC)OCC MSRJTTSHWYDFIU-UHFFFAOYSA-N 0.000 claims abstract description 17
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000001681 protective effect Effects 0.000 claims abstract description 12
- 239000003054 catalyst Substances 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 11
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 11
- QQQSFSZALRVCSZ-UHFFFAOYSA-N triethoxysilane Chemical compound CCO[SiH](OCC)OCC QQQSFSZALRVCSZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000007598 dipping method Methods 0.000 claims abstract description 8
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 38
- 239000010959 steel Substances 0.000 claims description 38
- 238000005507 spraying Methods 0.000 claims description 37
- 238000003756 stirring Methods 0.000 claims description 16
- 238000010276 construction Methods 0.000 claims description 15
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- 239000000463 material Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 10
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- 238000002156 mixing Methods 0.000 claims description 6
- 239000012466 permeate Substances 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
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- 230000036541 health Effects 0.000 claims description 4
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- 238000004140 cleaning Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 230000002194 synthesizing effect Effects 0.000 claims 1
- 238000005470 impregnation Methods 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 16
- 238000012360 testing method Methods 0.000 description 14
- 239000011148 porous material Substances 0.000 description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
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- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000010000 carbonizing Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
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- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 150000001343 alkyl silanes Chemical class 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
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- 239000001569 carbon dioxide Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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Abstract
The invention discloses a hydrophobic strong-dipping layer protection structure for preventing concrete from carbonization, which is characterized in that n-octene, triethoxysilane and platinum catalyst are prepared for preparing n-octyltriethoxysilane; preparing n-octyl triethoxysilane, water and emulsifier to synthesize impregnant; and (3) coating the concrete member with the synthetic impregnant to form a carbonization-resistant hydrophobic strong-impregnation protective structure layer. The invention has the beneficial effect of improving the durability of the concrete.
Description
Technical Field
The invention belongs to the technical field of highway bridge construction, and relates to a hydrophobic strong-dipping-layer protection structure for preventing concrete from carbonizing.
Background
The carbonization of the concrete surface of the member is very harmful to the member. In concrete, there are alkaline substances which, upon contact with CO2 in the humid air, react chemically to form carbonate and water. Thus, the alkalinity of the concrete decreases. We call this phenomenon the carbonization of concrete. The depth of concrete carbonization is related to the surface compactness of concrete, the open pore condition of concrete, the properties of cement and aggregate, the strength of concrete mixture, the environmental humidity of admixture and member, the content of CO2 in air and the like. Carbonization of concrete is a chemical reaction that is harmful to concrete, and the strength of concrete decreases after carbonization. The greater the concrete carbonization depth, the greater the influence on the concrete member. Before the carbonization depth of the concrete does not reach the thickness of the reinforcing steel bar protection layer, concrete particles near the surface of the concrete expand due to carbonization, and the concrete is gradually loosened and seriously falls off; when the carbonization depth reaches the surface of the internal steel bar, the concrete protective layer is completely peeled off, the steel bar is exposed, the steel bar is corroded, the steel bar loses the effect, the safety of a structure is seriously endangered, and the durability of the concrete member is reduced.
In recent years, as the transportation department has proposed quality engineering activities, the research on the durability of concrete members of structures has been considered as an important part of quality engineering in various regions. In China, from the nineties of the last century, traffic infrastructure is continuously increased, the total road mileage is continuously increased, structures such as bridges are also increased, the phenomenon of surface carbonization cannot be avoided due to the characteristics of concrete materials used by concrete members, and in some areas, the phenomena of concrete surface peeling and steel bar corrosion exposure caused by concrete carbonization continuously occur, and the safety of the structures is endangered even in some areas. In the past, the carbonization phenomenon of the concrete is not considered in engineering, or no solution is available, the best solution is to improve the strength of the concrete, and the surface compactness of the concrete is improved through the improvement of the strength of the concrete, so that carbon dioxide in the air is prevented from entering gaps on the surface of the concrete, and the carbonization of the concrete is delayed to a certain extent. In addition, some methods such as selecting cement varieties and coating on the surface of the concrete have more defects, firstly, the strength of the concrete is increased, so that the manufacturing cost is increased, secondly, the carbonization still cannot be completely caused even if the strength is increased, and the carbonization still can be caused after a long time.
Disclosure of Invention
The invention aims to provide a hydrophobic strong soaking layer protection structure for preventing concrete from carbonization, and the invention has the beneficial effect of improving the durability of the concrete.
The technical scheme adopted by the invention is carried out according to the following steps:
step 1: preparation of n-octyl triethoxysilane
Preparing n-octene, triethoxysilane and platinum catalyst, adding n-octene and platinum catalyst into a container, stirring uniformly, slowly heating, keeping stirring during heating, stopping heating when the temperature rises to 95 +/-5 ℃, keeping the temperature unchanged, slowly dripping triethoxysilane into a dropping funnel at a speed suitable for timely melting a dripping liquid into n-octene, and stopping heating and stirring after continuously keeping stirring and temperature for a period of time after dripping is completed;
step 2: synthesis of impregnant
Preparing n-octyl triethoxysilane, water and an emulsifier, mixing the components, adding the mixture into an emulsifying machine, and stirring to complete preparation of the impregnating material;
and step 3: formation of carbonization-proof hydrophobic strong-dipping protective structure layer
If the concrete member is a newly-built concrete member, construction is carried out according to the following construction procedures:
firstly, before concrete pouring, rust on the surface of a member steel bar is removed by a steel wire brush, so that the surface is clean and dry without rust;
secondly, brushing the surface of the steel bar with the impregnant paste by using a rolling brush, wherein the brushing is performed from bottom to top, and the uniform spraying is ensured;
thirdly, after the steel bars coated with the impregnant are completely dried, concrete can be poured;
fourthly, after the concrete pouring is finished, the formwork can be dismantled when the formwork removal strength is achieved, and water should be preserved for health maintenance after the formwork removal;
and fifthly, after the curing period, brushing the dipping paste on the surface of the concrete when the concrete is dried.
If the concrete surface construction of the old structure is carried out, the method comprises the following steps:
firstly, processing damaged concrete and exposed steel bars, firstly removing rust on the surfaces of the steel bars, if the steel bars are seriously corroded and can not be used continuously, replacing and reinforcing the original steel bars by adopting a welding or bar planting method, secondly chiseling loose concrete at the damaged positions to expose clean surfaces, and blowing off dust to clean and dry the surfaces; finally, repairing the damaged part by using high-strength repairing glue;
secondly, after the high-strength repair adhesive repairs the damaged surface, cleaning and blowing dust to the concrete surface of the member to be painted, so that the surface is kept clean and dry;
thirdly, coating impregnant; spraying with sealed spray gun and other high pressure spraying equipment from bottom to top at a spraying amount of 50-100g/m2The spraying should be continuously carried out without interruption, and after the spraying is finished, the paste can freely enter the concrete.
Further, in step 1, the ratio of n-octene, triethoxysilane, and platinum catalyst is adjusted in a 1.09: 1: a mass ratio of 0.005 was prepared.
Further, in the step 2, the mixture is prepared by mixing n-octyl triethoxysilane: water: the mass ratio of the emulsifier is 75: 22: and 3, preparing.
Further, in the step 3, during the construction of a newly-built concrete member, when concrete is dried after the curing period, the paste body can be coated on the surface of the concrete, before coating, the surface of the concrete is ensured to be dry and clean without accumulated water, dirt, dust and oil stain, high-pressure spraying equipment such as a sealing spray gun and the like is used for spraying from bottom to top, the spraying amount is 50g/m2, the spraying is continuously carried out without interruption, and after the spraying is finished, the impregnant is allowed to freely permeate.
Drawings
FIG. 1 is a schematic view of the process of impregnating a capillary pore with an impregnant;
FIG. 2 is a schematic illustration of the impregnant impregnating the pores to form a dense protective film;
figure 3 is a schematic cross-sectional view of a concrete structural member;
fig. 4 is a schematic diagram of average moisture absorption rate of paste impregnation.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The material mainly comprises the components of n-octene, triethoxy hydrosilane, platinum catalyst, water and emulsifier. The preparation method comprises the following steps:
1. firstly, the preparation of n-octyl triethoxysilane is carried out
Raw materials of n-octene, triethoxy hydrosilane and platinum catalyst are mixed according to the weight ratio of 1.09: 1: a mass ratio of 0.005 was prepared.
The chemical principle for preparing n-octyl triethoxysilane is that n-octene and triethoxysilane undergo hydrosilylation at a certain temperature (with the addition of a platinum catalyst).
Adding prepared n-octene and platinum catalyst into a container, stirring uniformly, slowly heating, keeping stirring in the heating process, stopping heating when the temperature is raised to 95 +/-5 ℃, and keeping the temperature unchanged. Then, triethoxysilane is slowly dripped by a dropping funnel while stirring, and the dripping speed is preferably that the dripping liquid can be timely dissolved into n-octene. And (3) after the dropwise addition is completed, continuously keeping stirring and temperature, timing from the dropwise addition of the triethoxy hydrosilane, and stopping heating and stirring after 3 hours, thereby completing the preparation of the n-octyl triethoxy silane.
N-octyl triethoxysilane is an active substance constituting the permeation material, is a transparent colorless oily solution, is also a long-chain alkyl silane coupling agent, and is commonly used for corrosion prevention of materials. The invention utilizes the strong hydrophobicity of the n-octyl triethoxysilane and simultaneously has smaller molecular volume, and the molecular volume can permeate into the capillary pores of the concrete to form a compact protective film.
2. Synthesis of impregnant
The impregnant adopts n-octyl triethoxysilane and water to form a paste after emulsification. Wherein the mixture is prepared by mixing n-octyl triethoxysilane: water: the mass ratio of the emulsifier is 75: 22: 3. the preparation method comprises the following steps of mixing the components, adding the mixture into an emulsifying machine, and stirring the mixture for 30 minutes at the temperature of 40 ℃ to finish the preparation of the impregnating material.
This concrete impregnant material is capable of sealing the concrete surface from direct contact with air. The principle is that the impregnant has certain moisture, and after the active n-octyl triethoxysilane and water are subjected to demulsification reaction, ethanol is generated at the same time to form a polymerized silicon resin mesh structure, the permeability of the mesh silicon resin structure is super strong, when the impregnant is sprayed on the surface of concrete, the mesh silicon resin structure can penetrate through a concrete structure layer very easily and is immersed into open pores (capillary pores) of the concrete, the inner wall of the capillary pores is distributed in a random manner, and after the capillary pores are filled, a layer of hydrophobic film is formed on the surface of the concrete of the structure, so that the volatilization of the active component of the n-octyl triethoxysilane can be effectively prevented. The strong permeability of this impregnant forms an almost permanent concrete protective barrier, blocking the ingress of gas and water, thus preventing concrete carbonation. Fig. 1 is a schematic diagram of a process of impregnating the impregnant into the capillary pores, and fig. 2 is a schematic diagram of a compact protective film formed after the impregnant is impregnated into the capillary pores.
3. Construction step and formation of carbonization-proof hydrophobic strong-dipping protective structure layer
3.1, construction;
in the case of a newly constructed concrete member, construction is performed according to the following construction procedure, as shown in FIG. 3.
Firstly, before concrete pouring, rust on the surface of a member steel bar is removed by a steel wire brush, so that the surface is clean and dry without rust;
secondly, brushing the impregnant paste on the surface of the steel bar by using a rolling brush, wherein the brushing is performed from bottom to top, and the uniform spraying is ensured. The purpose of coating the impregnant on the surface of the steel bar is to protect the steel bar by one more layer and further ensure that the steel bar is not corroded.
Thirdly, after the steel bars coated with the impregnant are completely dried (about 1.5 hours, the drying time is slightly long in winter generally according to the ambient temperature), concrete can be poured.
Fourthly, after the concrete is poured, the formwork can be dismantled when the formwork removal strength is achieved, water should be kept for health maintenance after the formwork removal, and the life-maintaining period is generally not less than 7 d.
And fifthly, after the curing period is over, brushing the paste on the surface of the concrete when the concrete is dried. Before coating, the surface of the concrete should be ensured to be dry and clean without accumulated water, dirt, dust, oil stain and the like. High-pressure spraying equipment such as a sealing spray gun is used for spraying from bottom to top (so that the strong permeating agent is paste, and the spraying speed is not much faster than that of manual coating even if the high-pressure spray gun is used). The number of spraying passes is determined by the specific circumstances, generally the spraying amount is 50g/m2, the spraying should be continuously carried out without interruption, and the impregnant is allowed to freely penetrate after the spraying is finished. The time for the impregnant to completely penetrate into the concrete is generally related to the surface compactness of the concrete, the strength of the concrete, the spraying amount of the impregnant, the ambient temperature and the cleanness degree of the concrete surface, and the depth of the concrete which can penetrate into the concrete within 4 hours is generally 2-3mm when the ambient temperature is 20 ℃. The lower the concrete strength, the greater the depth.
If the concrete surface construction of the old structure is carried out, the following steps are carried out.
Firstly, processing the damaged concrete and the exposed reinforcing steel bars. Firstly, rust on the surface of the steel bar is removed, and if the steel bar is seriously corroded and can not be used continuously, the original steel bar is replaced and reinforced by adopting a welding or bar planting method. Secondly, chiseling loose concrete at the damaged part to expose the clean surface, and blowing off dust to ensure that the surface is clean and dry; and finally repairing the damaged part by using high-strength repairing glue.
Secondly, after the high-strength repairing glue is used for repairing the damaged surface, the surface of the member concrete to be painted is cleaned and blown with dust, so that the surface is kept clean and dry.
And thirdly, coating the impregnant. Spraying from bottom to top by high-pressure spraying equipment such as a sealed spray gun. The number of spraying passes is determined according to specific conditions, and the spraying amount is generally 50-100g/m2The spraying should be carried out continuously without interruption, and after the spraying is finished, the paste can freely permeate.
3.2 formation of protective case Structure of anti-carbonation concrete
After the impregnant paste is sprayed on the surface of the concrete, the impregnant paste can be slowly immersed into the concrete, and the paste coated on the surface can be completely immersed within 4-6 hours, so that the surface of the concrete has no difference from the original surface.
When the active body of the impregnant is immersed into the surface of the concrete to a certain depth, a layer of strong concrete external isolation layer and hydrophobic layer is formed, air and water vapor are completely isolated, so that the carbonization reaction of the concrete can not be carried out, and the purpose of permanently protecting the concrete is achieved.
4 Each item of test and evaluation of Effect
4.1 quality, cost control aspects
After the impregnant is brushed, the impregnant can be completely immersed into the concrete without any trace and influencing the appearance quality of the concrete.
When the coating is carried out, the quality control is simple, the coated area and the non-coated area are very easy to distinguish within a period of time, and the phenomena of repeated construction, brush omission and the like can not occur.
The impregnant has the advantages of low material cost and simple preparation, and the treatment cost (including labor cost) per 100 square meters is about 280 yuan calculated according to the dosage of 50g of the impregnant per square meter, thereby greatly saving the treatment cost.
In addition, the impregnant is paste, does not flow away from the surface when being brushed, does not generate waste, does not generate any damage to the environment and water, and is transparent and environment-friendly.
4.2 laboratory test
Immersion depth test of impregnated paste
Concrete samples with different strength grades are coated with the impregnant paste, and the obtained depth detection data of the concrete immersed in the concrete are shown in table 1.
TABLE 1 dosage of concrete impregnation paste material and depth of impregnation
Testing the hydrophobicity of the hydrophobic strong dipping layer;
12 groups (3 pieces per group) of C15-grade concrete test pieces were prepared, and 6 of the test pieces were used at a rate of about 120g/m2The paste was coated on six surfaces by dipping, and the surfaces of the other 6 groups of test pieces were not treated. Then the sample is moved to a curing room for curing for 14 days under standard conditions (20 ℃ plus or minus 3 ℃ and relative humidity more than 90%). Will try outThe parts were placed in KOH solution and after 2 days were removed, blown dry with a blower and weighed the original weight. Soaking in clear water for 28 days (wherein soaking is carried out after taking out, drying, weighing and soaking for 3 days, 7 days, 10 days, 14 days, 21 days and 28 days). This gave a change in the moisture absorption of the test piece as shown in FIG. 2.
From fig. 4, it can be seen that the average moisture absorption of the paste impregnation is reduced by 62% compared to the non-coated impregnated concrete.
4.3 outdoor authentication
Firstly, quickly testing the sealing effect;
in order to quickly verify the gas-barrier and water-blocking effectiveness of the impregnant, a steel strand is used for a steel bar rust-blocking test. Three brand-new steel strands are arranged, the length of each steel strand is 60cm, 1/2 of each steel strand is completely coated with impregnant paste, 1/2 of the steel strands are not coated, then the three steel strands are placed in a health preserving room with the humidity of more than 90%, photos are taken every day for observation, and the result shows that rust is generated on the part which is not coated with the impregnant on the third day, and the part which is not coated with the impregnant is completely rusted and the part which is coated with the impregnant is not rusted after 20 days, so that the impregnant paste is effective.
Outdoor carbonization depth test of concrete sample
And (3) preparing 12 groups of concrete test pieces with the concrete strength grade of C15, wherein 6 groups are coated with 6 surfaces by using an impregnant, and the other 6 groups are not treated and do not need to be cured and are placed outdoors, and the carbonization depth is detected every 1 month. The detection is continued for 12 months. As a result, the carbonization depth of the untreated concrete test piece is increased along with the increase of time, the average value of the carbonization depth of the 6 groups of test pieces is 26mm, and the maximum value reaches 33 mm. And the carbonization depth of the 6 groups of test pieces coated with the impregnant is all 0.
After the material disclosed by the invention permeates into the surface layer of the concrete, an isolation layer which is in contact with the external air and moisture is formed, and a protection structure for preventing the concrete from carbonizing is formed. By spraying the impregnant on the surface of the concrete, the impregnant isolates the contact between the concrete and the air from the surface on one hand, and on the other hand, the impregnant can also be immersed into the open gap of the concrete to form an isolation layer formed by the concrete and the impregnant together. In addition, the water repellent strong impregnation agent forming the protection structure of the water repellent strong impregnation layer is colorless transparent paste, and the water repellent strong impregnation agent is completely absorbed by the concrete after being sprayed, so that the natural color of the concrete is maintained.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the present invention.
Claims (4)
1. A hydrophobic strong dipping layer protection structure for preventing concrete carbonization is characterized by comprising the following steps:
step 1: preparing n-octyl triethoxysilane;
preparing n-octene, triethoxysilane and platinum catalyst, adding n-octene and platinum catalyst into a container, stirring uniformly, slowly heating, keeping stirring during heating, stopping heating when the temperature rises to 95 +/-5 ℃, keeping the temperature unchanged, slowly dripping triethoxysilane into a dropping funnel at a speed suitable for timely melting a dripping liquid into n-octene, and stopping heating and stirring after continuously keeping stirring and temperature for a period of time after dripping is completed;
step 2: synthesizing an impregnant;
preparing n-octyl triethoxysilane, water and an emulsifier, mixing the components, adding the mixture into an emulsifying machine, and stirring to complete preparation of the impregnating material;
and step 3: forming a carbonization-resistant hydrophobic strong-dipping protective structure layer;
if the concrete member is a newly-built concrete member, construction is carried out according to the following construction procedures:
firstly, before concrete pouring, rust on the surface of a member steel bar is removed by a steel wire brush, so that the surface is clean and dry without rust;
secondly, brushing the surface of the steel bar with the impregnant paste by using a rolling brush, wherein the brushing is performed from bottom to top, and the uniform spraying is ensured;
thirdly, after the steel bars coated with the impregnant are thoroughly dried, concrete can be poured;
fourthly, after the concrete pouring is finished, the formwork can be dismantled when the formwork removal strength is achieved, and water should be preserved for health maintenance after the formwork removal;
after the curing period is over, brushing paste on the surface of the concrete when the concrete is dried;
if the concrete surface construction of the old structure is carried out, the method comprises the following steps:
firstly, processing damaged concrete and exposed steel bars, firstly removing rust on the surfaces of the steel bars, if the steel bars are seriously corroded and can not be used continuously, replacing and reinforcing the original steel bars by adopting a welding or bar planting method, secondly chiseling loose concrete at the damaged positions to expose clean surfaces, and blowing off dust to clean and dry the surfaces; finally, repairing the damaged part by using high-strength repairing glue;
secondly, after the high-strength repair adhesive repairs the damaged surface, cleaning and blowing dust to the concrete surface of the member to be painted, so that the surface is kept clean and dry;
thirdly, coating impregnant; spraying with sealed spray gun and other high pressure spraying equipment from bottom to top at a spraying amount of 50-100g/m2The spraying should be carried out continuously without interruption, and after the spraying is finished, the paste can freely permeate.
2. The hydrophobic strongly-impregnated layer protective structure for preventing concrete carbonization according to claim 1, wherein: in the step 1, the ratio of n-octene, triethoxysilane and platinum catalyst is 1.09: 1: a mass ratio of 0.005 was prepared.
3. The hydrophobic strongly-impregnated layer protective structure for preventing concrete carbonization according to claim 1, wherein: the mixture in the step 2 is prepared by mixing n-octyl triethoxysilane: water: the mass ratio of the emulsifier is 75: 22: and 3, preparing.
4. The hydrophobic strongly-impregnated layer protective structure for preventing concrete carbonization according to claim 1, wherein: in the step 3, during the construction of a newly-built concrete member, after the curing period, when the concrete is dried, the paste body can be coated on the surface of the concrete, before coating, the surface of the concrete is ensured to be dry and clean without accumulated water, dirt, dust and oil stain, the concrete is sprayed from bottom to top by high-pressure spraying equipment such as a sealing spray gun, the spraying amount is 50g/m2, the spraying is continuously carried out without interruption, and after the spraying is finished, the impregnant is allowed to freely permeate.
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| CN203200928U (en) * | 2013-04-27 | 2013-09-18 | 杭州昊港科技有限公司 | Concrete anti-corrosion structure |
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