CN109797873B - Wrapping protection method for concrete member in tidal range area - Google Patents
Wrapping protection method for concrete member in tidal range area Download PDFInfo
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- CN109797873B CN109797873B CN201910053493.8A CN201910053493A CN109797873B CN 109797873 B CN109797873 B CN 109797873B CN 201910053493 A CN201910053493 A CN 201910053493A CN 109797873 B CN109797873 B CN 109797873B
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Abstract
The invention relates to a wrapping protection method for a concrete member in a tidal range, which aims at the influence of special and severe comprehensive corrosive environment factors in the tidal range, adopts a PVF wrapping protection technology, and combines silane impregnation, a special base coat, a novel silane modified sealant sealing protection and bonding transition technology to realize reliable and durable protection for the concrete member in the tidal range. The method has the advantages of simple and convenient technical construction, energy conservation and environmental protection, high-efficiency, lasting and reliable anticorrosion effect of the wrapping protection system, obvious social and economic benefits and good popularization and application prospects.
Description
Technical Field
The invention relates to a concrete surface corrosion protection technology, in particular to a wrapping protection method for a concrete member in a tidal range area, and belongs to the technical field of anticorrosion engineering.
Background
China is a big ocean country, large-scale sea-crossing bridges and other harbor engineering construction are continuously developed, ocean infrastructure strength is further strengthened, and the engineering is rapidly promoted to harbor and sparse harbor engineering along the line, so that ocean economy becomes an important economic component of China, and the corrosion problem of reinforced concrete engineering in ocean environment is more and more highly emphasized in the engineering technical field. The research on the durability of the marine concrete at home and abroad has gained relatively unified understanding, wherein, the main factors influencing the durability of the concrete are as follows: (1) corrosion by chlorine salt; (2) sulfate corrosion; (3) carbonizing concrete; (4) freeze thawing and destroying; (5) alkali aggregate reaction, and the like. Wherein chloride ion penetration and corrosion of the steel reinforcement are the most typical damaging factors.
However, the existing research shows that the marine environment is different from a general corrosive environment but is a more harsh and complex corrosive environment, the marine corrosive environment is divided into 5 areas, namely a marine atmosphere area, a splash area, a tidal range area, a water area and a sea mud area, from top to bottom, wherein the seawater tidal range area and the splash area are the worst corrosive environment areas in the marine engineering, and the engineering structure of the area not only relates to the problem of alternation of dryness and humidity, but also has the problems of splashing of sea waves, washing of water flow and sediment, corrosion of marine organisms, collision of foreign matters and the like, so that the aging speed of the area is particularly accelerated, internal reinforcing steel bars are corroded, and the service life of marine structures is influenced. The investigation of technical personnel also shows that the concrete engineering in the marine environment in China has serious corrosion and damage after use, needs frequent maintenance and brings great economic loss to the society. The harbor engineering built in China before 90 years generally has the defects that reinforcing steel bars are corroded and seriously damaged by 10-20 aa, and the service life of the structure basically cannot meet the design requirement.
The concrete member corrosion protection method aiming at the splash zone and the tidal range zone is researched by a plurality of technicians, such as increasing the thickness of a concrete protective layer, adding a concrete corrosion inhibitor, adopting epoxy coating steel bars, silane impregnation, external coating protection, electrochemical protection of the steel bars and the like. At present, the most used method is an external coating protection method, i.e. a method for coating paint on the outer surface of concrete, such as JT J275-.
CN201872393 discloses a concrete protective coating structure, which is formed by compounding three layers of structures, wherein the three layers of structures are a silane impregnant permeable layer, a silane hybrid elastic coating breathable isolation layer and a surface decorative layer in sequence from inside to outside, and the surface decorative layer is a weather-resistant coating; CN206385036 discloses a concrete protection flexible coating structure which is mainly formed by compounding four layers of structures, and a flexible sealing isolation layer and a weather-resistant coating surface decoration layer which are sequentially formed by a cement-based putty layer, a silane impregnation penetration layer and a sealant from inside to outside. The technology and similar technical materials have positive effects on the protection of the surface of a concrete structure in a common corrosive environment and the surface of the concrete structure in an atmospheric region in a marine environment by using an additional coating method, but the problem of coating falling off occurs early (3-5 a) on the surface of the concrete structure in a tidal range region, and the coating has low adhesive force with a concrete matrix and only 1-3 MPa because of the influence of the property of the concrete matrix and the quality effect of the coating bottom coat; the concrete matrix is not well protected during treatment, so that aging damage conditions such as carbonization, alkali aggregate reaction, freeze thawing and the like are easily caused, the joint surface of the coating is damaged and falls off, and the anticorrosion coating system fails; secondly, the method has a complex process, 4-7 coatings are generally coated to finish the whole coating, and each coating needs to be cured for 4-24 hours to carry out next coating, so that the coating period is long, and the construction of the project in the tidal range environment is difficult; finally, the coating has low durability in the marine environment, and is required to be completely maintained for about 5-10 a, and the maintenance cost is even higher than that of the first coating.
Although the laboratory test research result of the existing improved moisture-curing coating system is good, the problem of large-scale coating falling can be found in less than 3a after the existing improved moisture-curing coating system is practically applied to a concrete pier in a tidal range of a certain cross-sea bridge pier, and the problems of complex working conditions and quality control factors faced by the concrete engineering site in the tidal range are also key factors for success of technical application.
In order to solve the problem that the protection effect of a coating system of a tidal range zone coating in a marine environment is not ideal, CN102383619 discloses a method for corrosion protection treatment of concrete members in the tidal range zone and a splash zone in the marine environment, wherein a silane impregnant is coated on the outer surface of the concrete, and the penetration depth is more than 1 mm; naturally drying, and then coating a layer of silane-terminated polyether sealant in a scraping manner, wherein the thickness is 2-5 mm; immediately coating a prefabricated protective cover after finishing; coating a layer of sealant in the protective cover in a scraping manner; sealing the upper end, the lower end and the corners of the protective cover by using sealant; coating weather-resistant finish paint on the whole coating system; the technology does not solve the problems that the interface of the concrete matrix surface is easy to carbonize, freeze thawing and the like is unstable and easy to damage, so that the sealant is poor in adhesion with the concrete matrix and easy to strip, and seawater directly infiltrates into the concrete matrix surface after being soaked. CN104120743 discloses a method for protecting a concrete pile in a marine environment, which includes firstly polishing the surface of the concrete pile, then spraying an epoxy primer layer and an epoxy intermediate paint layer on the surface of the pile, winding an anti-corrosion tape on the cured paint layer, then further cladding and fastening the paint layer by using a prefabricated armor, and then filling water-cured epoxy adhesives at the upper end, the lower end and the flange joint after cladding and fastening the armor. The technology adds the prefabricated armor on the basis of the original coating protection system, and although the influence of seawater scouring is eliminated, the technical problems of the original coating protection system are not solved. The protective sleeve, the armor and the like are prepared by taking polyester resin as a main material, and obviously cannot meet the requirement of the bridge engineering on the initial maintenance life of more than 20a according to the prior art; in addition, the concrete engineering in the tidal range area has large structural overall dimension and variable appearance, is positioned on the sea surface, and causes great difficulty in the forming manufacture and field installation of armor and protective sleeves, so that the installation sealing quality is difficult to guarantee, and the safety and the cost of the protection operation are obviously increased.
CN107630513 discloses an ocean engineering concrete anti-corrosion method, comprising the following steps: (1) compounding a polyisobutenyl sealant layer and an ultraviolet light protective layer together; (2) cleaning the surface of the concrete to be protected to remove the foreign objects and floating ash on the surface; (3) coating a solvent-free epoxy primer coat on the surface of the cleaned concrete; (4) after the surface of the epoxy base coat is dried, a composite layer of a polyisobutenyl sealant layer and an ultraviolet light protective layer is directly adhered to the surface of the epoxy base coat, and a composite layer sheet is bordered. According to the method, the polyisobutenyl-based sealing adhesive tape prepared by using the aluminum foil, the PVC tape and the polyethylene sheet as the back materials is adopted for pasting construction, the method is convenient and fast and is environment-friendly, but the situation that the surface of a concrete substrate in a tidal range area is unstable still exists due to the adoption of solvent-free epoxy primer coating treatment, and the weather resistance and the durability of the adhesive tape material using the aluminum foil, the PVC tape and the polyethylene sheet as the back materials are also obviously insufficient.
Disclosure of Invention
Aiming at the problems in the prior art, the invention performs strengthening treatment on a matrix, particularly a surface interface of the concrete according to the analysis of a corrosive environment and construction working conditions faced by the concrete in a tidal range, absorbs the experience and training existing in the prior art, adopts a special primer to strengthen the strength, compactness and stability of the concrete surface on the basis of silane impregnation, adopts a novel silane modified sealing material to perform sealing and flexible treatment on the concrete interface, forms a smooth and uniform transition bonding interface, is used as a bridge to realize the tight, reliable and durable bonding of the surface of the concrete matrix and an outer layer high-performance PVF adhesive tape wrapping layer, and strictly controls the whole protection method to be completed in a tide falling period, thereby realizing the reliable protection of the concrete surface in the tidal range above 20 a.
The invention solves the problems of the prior art by adopting the specific scheme as follows: a method for preventing a concrete member in a tidal range area from being wrapped comprises the following steps:
first, substrate treatment
Cleaning floating ash, floating slurry, slag inclusion, moss and loose parts on the surface of a concrete member matrix to be protected by adopting a high-pressure fresh water, sand blasting or manual polishing method, wherein the surface of the concrete member matrix is clean and firm; the surface of the concrete member substrate comprises pits, grooves, cracks and slab staggering left after treatment; in order to improve the wrapping quality, the upper part and the lower part of the matrix processing range of the concrete member can exceed the design range by more than 200 mm;
when the concrete member matrix is treated, the treatment is carried out from an atmospheric area, a splash area and a tidal range area from top to bottom along the surface of the concrete member matrix, the treatment on the surface of the concrete member matrix in the tidal range area is immediately carried out from the moment when the tide falls from a high tide line, and the treatment on the surface of the concrete member matrix above the water surface is completed after the tide falls to a lowest working surface or within 30min before the low tide line;
measuring the water content of the surface of the processed concrete member matrix at any time, and when the water content is more than 6%, drying and blowing the surface of the concrete matrix by using an air heater to reduce the water content to below 6%;
second step, silane impregnation
After the water content of the concrete member matrix is controlled below 6 percent, immediately brushing 1-2 times of pasty silane impregnant along the downward 200mm position from the lower part of the treatment range or the upward direction of the horizontal plane, wherein the dosage is 200-2The single-pass dipping operation time in the tidal range zone is controlled within 5 min;
third, priming treatment
The pasty silane impregnant is coated on the concrete member substrate for impregnation and surface drying, then the concrete member substrate is kept standing for 10-15min, and then 1 path of primer is coated in the upward direction from the water surface immediately, the dosage is 80-100g/m2The film thickness is 5-10 μm, the single brush coating operation is completed within 5min, and then the drying is carried out for 5-10 min;
fourthly, coating silane modified polymer sealant
After the primer is dried, immediately coating the silane modified polymer sealant in the upward direction from the water surface, and tightly filling, repairing, strickling or modifying the pits, grooves, cracks or slab staggering parts left on the surface of the concrete member matrix by using the silane modified polymer sealant; except the local repairing points, the thickness of the glue layer is generally 0.1-0.5 mm, and the blade coating operation is finished within 10 min;
fifthly, wrapping PVF adhesive tape
After finishing the blade coating operation, standing for 10-20min, immediately carrying out PVF adhesive tape wrapping operation along the upward direction from the water surface or the lower part of the treatment range of the concrete member matrix; wrapping the PVF adhesive tape on the concrete member matrix twice along the horizontal position, then spirally wrapping the PVF adhesive tape upwards along the concrete member matrix, wrapping the PVF adhesive tape on the concrete member matrix twice along the horizontal position when the upper part of the treatment range of the concrete member matrix is finished, and lapping and transiting the PVF adhesive tape on the surface of the concrete member matrix; the lapping position of the PVF adhesive tape wrapping should exceed the upper part of a splash zone or the highest tide zone of astronomical tide; the influence of wind waves and sundries contained in the wind waves on the scouring or the impact of the lap joint area can be reduced to the greatest extent. In order to improve the wrapping quality of the PVF adhesive tape, a silane modified polymer sealing adhesive layer with the width of 200mm can be coated on the lower edge of the adhesive tape in a scraping mode.
The silane modified polymer sealant does not contain any plasticizer, and comprises the following raw materials in parts by weight: 40-60 parts of silane modified polymer resin, 30-50 parts of nano calcium carbonate, 0.2-2 parts of hydrophobic fumed silica, 2-5 parts of a water removing agent, 1-2 parts of an adhesion promoter and 0.5-1 part of a catalyst, and is prepared by adopting a low-temperature chemical water removal process;
the silane modified polymer resin is silane modified polyether resin MS, silane modified polyurethane resin SPUR or silane modified resin STP; the water removing agent is vinyl trimethoxy silane; the adhesion promoter is epoxy silane or amino silane; the catalyst is organic tin or chelated tin;
the silane impregnant is isobutyl triethoxysilane or isooctyl triethoxysilane;
the primer is a primer product special for sealing the existing assembly type building joint.
In the silane modified polymer sealant, the sealant prepared from the silane modified polymer resin is crosslinked and vulcanized by utilizing moisture in the environment, and the sealant has certain compatibility with water and can be well adhered to a wet matrix; the silane modified polymer sealant is prepared by adopting the existing low-temperature and chemical dehydration process;
the invention relates to an optimized scheme of a wrapping protection method for a concrete member in a tidal range area, which comprises the following steps: in order to improve the colloid shielding performance, the silane modified polymer sealant also comprises an antirust sheet material accounting for 5-10% of the total weight of the silane modified polymer sealant and cellulose acetate butyrate accounting for 0.1-1% of the total weight of the silane modified polymer sealant;
the antirust flaky material is flaky zinc powder or flaky aluminum powder.
The silane modified polymer sealant is designed without any plasticizer, so that the problem of tearing off the PVF adhesive tape and the pressure-sensitive adhesive thereof caused by the combination of the conventional sealant coating and the bonding surface of the PVF adhesive tape in the existing test process is solved, and meanwhile, the adhesive physical property is improved by improving the resin ratio and matching with the nano calcium carbonate, and the reliability and durability of the wrapping combination of the sealant coating and the PVF adhesive tape are ensured; adding zinc flake powder, aluminum flake powder or other antirust flake materialAnd the auxiliary agent of cellulose acetate butyrate is matched to further improve the water vapor shielding performance of the silane modified polymer sealing adhesive layer and improve the corrosion-resistant medium, especially Cl-The corrosion and penetration capacity is particularly necessary for protecting underwater areas by independently depending on silane modified polymer sealing glue layers; in addition, the dosage of the water removing agent is properly increased, and when the silane modified polymer sealant is coated on the surface of a concrete substrate with relatively high water content by blade coating, the silane modified polymer sealant has certain dewatering capacity, can quickly eliminate the possible water on the contact surface of the concrete (especially when scraping glue underwater), and ensures that the sealant is reliably bonded with the substrate.
The invention relates to an optimized scheme of a wrapping protection method for a concrete member in a tidal range area, which comprises the following steps: the thickness of the PVF adhesive tape is 0.125-0.25mm, and the winding overlapping width of the PVF adhesive tape is 30-50% of the tape width.
The invention relates to an optimized scheme of a wrapping protection method for a concrete member in a tidal range area, which comprises the following steps: the thickness of the PVF adhesive tape is 0.125-0.25mm, and the winding overlapping width of the PVF adhesive tape is more than 50% of the tape width and is not more than 100%.
The invention relates to an optimized scheme of a wrapping protection method for a concrete member in a tidal range area, which comprises the following steps: the PVF adhesive tape can also be wound and packaged along the direction of the water surface in the atmospheric region; wrapping the adhesive tape on the concrete member matrix twice along the horizontal position of the atmospheric region, and then spirally wrapping the adhesive tape downwards along the concrete member matrix, wherein the adjacent adhesive tapes are overlapped according to 30-50 percent; wrapping the concrete member along the horizontal position for two or more times when the lower part of the matrix treatment range of the concrete member is finished; the lower end part of the PVF adhesive tape can at least leave a silane modified polymer sealant layer with the height of more than 200 mm.
The PVF adhesive tape has excellent self-adhesive performance, and DuPont tests show that the change of the spiral wrapping direction of the PVF adhesive tape does not affect the bonding and sealing performance of the PVF adhesive tape, and the PVF adhesive tape plays an important role in being superior to the bonding and sealing performance of other tapes aiming at the special working conditions that the water level of a tidal range area is from bottom to top during rising tide and from top to bottom during falling tide.
The invention relates to an optimized scheme of a wrapping protection method for a concrete member in a tidal range area, which comprises the following steps: the scrape coating of the silane modified polymer sealant can be carried out underwater if necessary, and the method comprises the following specific steps:
cleaning up surface adsorbates, laitances, slag inclusions, moss, marine life and loose parts at the lower limit of a tidal range zone of a concrete member matrix or in a range of 200mm underwater by adopting a manual or mechanical polishing method, ensuring the cleanness and firmness of the surface of the concrete member matrix, and treating the surface of the concrete member matrix by remaining pits, grooves, cracks and slab staggering;
coating the silane modified polymer sealant in a scraping manner, namely quickly beating or scraping the silane modified polymer sealant to the surface of concrete by adopting a glue gun gluing manner or a scraper scraping manner, and slowly pressing and scraping the silane modified polymer sealant to the surface of a concrete member matrix at a constant speed; the thickness of the adhesive layer is controlled to be 0.5-3 mm.
The invention relates to an optimized scheme of a wrapping protection method for a concrete member in a tidal range area, which comprises the following steps: when the silane modified polymer sealant is coated by scraping in underwater operation, the included angle between the plane of the pressing scraper and the surface of the concrete member matrix or the tangent line of the cambered surface of the concrete member matrix is less than 30 degrees.
The invention relates to an optimized scheme of a wrapping protection method for a concrete member in a tidal range area, which comprises the following steps: when the silane modified polymer sealant is coated by scraping in underwater operation, the included angle between the plane of the pressing scraper and the surface of the concrete member matrix or the tangent line of the cambered surface of the concrete member matrix is less than 15 degrees.
The small included angle of the scraper is beneficial to the glue body of the sealant in water to move along with the pressing of tools such as the scraper and the like, and drives seawater in an interface area to be bonded one by one, so that the sealant on a contact surface can be ensured to be stably unfolded and rapidly bonded with a concrete substrate, the quality problems of water inclusion, bubbling and the like of the glue body mixed with the seawater or the contact surface are avoided, although the underwater concrete is a wet surface, the silane modified polymer sealant has certain self-water removal capacity on the interface surface, and still can realize better bonding. The design is extended and the sealant is utilized wellWet surface adhesion, elastic seal and adhesion after one week of blade coating to prevent seawater and its Cl-The capability of upward reverse, infiltration and corrosion damage along the gap between the concrete surface and the bonding surface of the sealing layer reduces or eliminates the reverse erosion damage of seawater to the protective layer of the tidal range area.
The invention relates to an optimized scheme of a wrapping protection method for a concrete member in a tidal range area, which comprises the following steps: important engineering or important parts of the engineering, when the protection level needs to be improved, the PVF adhesive tape can be wrapped in the fifth step, the wrapping is marked as primary wrapping after the wrapping is finished, secondary wrapping can be carried out according to needs, when the secondary wrapping is carried out, the surface of the wrapped PVF adhesive tape is cleaned and dried, spiral wrapping is adopted, the central position of the secondary wrapped PVF adhesive tape is aligned to the joint position of the PVF adhesive tape left in the primary wrapping, and the adjacent adhesive tapes are overlapped by 10% -30% during the secondary wrapping; the secondary wrapping operation must be completed before the surge rises.
The PVF adhesive tape backing material is a polyvinyl fluoride film material, is formed by extruding a copolymer of fluorine and fluorocarbon molecules, has a crystal structure, high electric insulation performance, high toughness, excellent chemical resistance, ageing resistance, stain resistance, easy cleaning performance and corrosion resistance, has resistance and durability to sunlight, moisture and oxidation which are obviously superior to those of the existing PVC and PDPF materials, is further superior to that of the existing chlorosulfonated polyvinyl chloride wrapping tape and conventional waterproof coiled materials, and has a reliable engineering application example of more than 30 a. In addition, the PVF adhesive tape has hydrophobic surface, stain resistance and high toughness, can inhibit the adhesion growth of marine organisms and resist seawater scouring, can stably, reliably and long-term work at the temperature range of-40-90 ℃, and is organically combined with a sealant and a base coat to form effective interface strengthening, reliable sealing and durable protection on concrete in a tidal range.
The invention relates to an optimized scheme of a wrapping protection method for a concrete member in a tidal range area, which comprises the following steps: the preparation method of the silane modified polymer sealant comprises the following steps:
weighing the silane modified polymer sealant according to the proportion of the raw materials, firstly adding the silane modified polymer resin into a clean and dry double-planet stirrer, then sequentially adding hydrophobic fumed silica, nano calcium carbonate, cellulose acetate butyrate and 30-50% of water removal agent by weight, vacuumizing, and stirring and dispersing for 10-30min at the rotating speed of 50-100 rpm; gradually heating to 50-70 deg.C, stirring at 1000-; adding antirust sheet material, stirring at vacuum temperature below 40 deg.C and rotation speed of 200-; adding adhesion promoter, and stirring at vacuum temperature below 40 deg.C and rotation speed of 200-; finally adding a catalyst, continuously stirring for 10-20min at the rotation speed of 200-300rpm under vacuum at the temperature of below 40 ℃, discharging, sealing and packaging to obtain the silane modified polymer sealant.
During the first chemical dehydration, more than 80% of materials of the silane modified polymer sealant are added, and the dehydration effect can be ensured by adding 30-50% of the total amount of the dehydrator; the residual water removing agent accounting for 50-70% of the total amount of the water removing agent is added for the second water removing, and the residual water removing agent is remained in the sealant system, so that the effects of interface water removing and wet surface bonding effect guaranteeing can be exerted in the concrete surface scraping and coating process.
The invention has the advantages of
Aiming at the corrosive environment and the construction working condition of concrete in a tidal range region, the invention adopts the special primer for the concrete interface to strengthen the surface strength, the compactness and the stability of the concrete member matrix on the basis of silane impregnation, designs and adopts a novel high-performance silane modified sealing material without a plasticizer to seal and flexibly treat the concrete interface to form a smooth, uniform and stable transition bonding interface, and the bonding interface is used as a bridge to realize the tightness of the wrapping layer of the concrete member matrix surface and the outer high-performance PVF adhesive tape, reliable and durable bonding, the whole protection method combines special working conditions of a tidal range area to design time of each operation procedure and node quality control, the completion is ensured in a tide falling period, repeated pollution of tidal water to a working surface in the prior art is avoided, the quality of a sealing and wrapping effect is ensured, and the reliable protection of the surface of a concrete member substrate of the tidal range area above 20a can be realized.
The method further designs and extends towards the water surface direction even below the water surface on the basis of the corrosion protection area of the tidal range area, and prevents seawater and Cl thereof by utilizing the good wet surface bonding capacity of the sealant and the elastic sealing and bonding capacity formed after blade coating-The capability of upward reverse movement, permeation and corrosion damage along the gap between the surface of the concrete member matrix and the bonding surface of the sealing layer reduces or eliminates the reverse etching damage of seawater to the protective layer of the tidal range area, and further improves the effectiveness, reliability and durability of the wrapping sealing corrosion protection system.
The invention solves the reliability problem of the wrapping and bonding of the PVF adhesive tape and the sealant, realizes the successful application of the PVF adhesive tape in the sealing wrapping protection technology of the ocean tidal range area, ensures that the whole protection system has the performances of high electric insulation performance, high toughness, excellent chemical resistance, ageing resistance, stain resistance, easy cleaning and the like, can complete the secondary wrapping of the PVF before a flood tide, increases the thickness of the wrapping tape by the secondary wrapping, effectively seals the wrapping tape joint left in the primary wrapping process, can further improve the durability of the wrapping protection system of the tidal range area, and has the comprehensive protection performance reaching the design service life requirement of more than 50a of ocean engineering.
The method is simple and clear, has no paint coating on the site, has clean and efficient operation, is convenient and fast in construction method compared with the traditional wrapping protection technology, greatly reduces the operation difficulty and the strength, obviously saves the construction cost, and has good application and popularization prospects.
Drawings
FIG. 1 is a schematic view of a protection structure formed by a wrapping protection method for a concrete member in a tidal range area;
in the figure: 1-concrete member substrate, 2-silane impregnation layer, 3-base coating, 4-silane modified polymer sealant layer and 5-PVF adhesive tape wrapping layer.
Detailed Description
The scheme and the effect of the invention are further clarified by the following embodiments and the attached drawings:
examples 1 to 4
And (3) processing and preparing the silane modified polymer sealant.
Examples 1-4 the raw material composition of the silane modified polymeric sealants and parts by weight thereof are shown in table 1.
Weighing the materials according to the material proportion of silane modified polymer sealant embodiment 1-2 in Table 1, putting silane modified polymer resin into a clean and dry double-planet stirrer, sequentially adding hydrophobic fumed silica, nano calcium carbonate and 30-50% of water removal agent by weight, vacuumizing, and stirring and dispersing at the rotating speed of 50-100rpm for 10-30 min; then gradually heating to 50-70 ℃, stirring at a high speed of 1000-1500rpm for 30-90min until the sealant colloid is fine and uniform, and then cooling to below 40 ℃; adding the rest water removing agent, continuously stirring for 10-20min at the rotation speed of 200 plus 300rpm under vacuum at the temperature of 40 ℃, adding the adhesion promoter, and stirring for 10-20min at the rotation speed of 200 plus 300rpm under vacuum at the temperature of 40 ℃; finally adding an organic tin catalyst, continuously stirring for 10-20min at the rotation speed of 200-300rpm under vacuum at the temperature of below 40 ℃, discharging, sealing and packaging to obtain the silane modified polymer sealant.
Weighing the materials according to the material proportion of silane modified polymer sealant embodiment 3-4 in Table 1, putting silane modified polymer resin into a clean and dry double-planet stirrer, sequentially adding hydrophobic fumed silica, nano calcium carbonate, cellulose acetate butyrate and 50-70% of water removal agent by weight, vacuumizing, and stirring and dispersing at the rotating speed of 50-100rpm for 10-30 min; then gradually heating to 50-70 ℃, stirring at a high speed of 1000-1500rpm for 30-90min until the sealant colloid is fine and uniform, and then cooling to below 40 ℃; then adding aluminum flake powder, stirring for 30-60min at the rotation speed of 200-300rpm under vacuum at the temperature of 40 ℃, adding the residual water removing agent, continuing stirring for 10-20min at the rotation speed of 200-300rpm under vacuum at the temperature of 40 ℃, adding the adhesion promoter, and stirring for 10-20min at the rotation speed of 200-300rpm under vacuum at the temperature of 40 ℃; finally adding an organic tin catalyst, continuously stirring for 10-20min at the rotation speed of 200-300rpm under vacuum at the temperature of below 40 ℃, discharging, sealing and packaging to obtain the silane modified polymer sealant.
Table 1 examples 1-4 each material composition and parts by weight unit: parts by weight
As can be seen from the test data in Table 1, the expected effect of the design of the invention is realized in the embodiments 1-4, the comprehensive performance meets the requirements of the technical specifications of the existing industry, the PVF adhesive tape is well matched with the PVF adhesive tape and has lasting tolerance, and the hidden danger that the existing sealant is incompatible with the PVF adhesive tape is solved.
Example 5
A wrapping protection method for a concrete member in a tidal range area is characterized in that a wrapping protection structure is shown as figure 1, wherein a concrete member base body 1 is coated with a silane impregnation layer 2 on the surface of the concrete member base body 1, the silane impregnation layer 2 penetrates into the concrete member base body 1, a bottom coating 3 is coated on the surface of the silane impregnation layer 2, a silane modified polymer sealant layer 4 is coated on the surface of the bottom coating 3, and a PVF adhesive tape wrapping layer 5 is wrapped on the surface of the silane modified polymer sealant layer 4.
The invention relates to a wrapping protection method for a concrete member in a tidal range area, which comprises the following steps:
first, substrate treatment
Cleaning floating ash, floating slurry, slag inclusion, moss and loose parts on the surface of a concrete member matrix to be protected by adopting a high-pressure fresh water, sand blasting or manual polishing method, wherein the surface of the concrete member matrix is clean and firm; the surface of the concrete member substrate comprises pits, grooves, cracks and slab staggering left after treatment; the upper part and the lower part of the matrix treatment range of the concrete member should exceed the design range by more than 200 mm;
when the concrete member matrix is treated, the treatment is carried out from an atmospheric area, a splash area and a tidal range area from top to bottom along the surface of the concrete member matrix, the treatment on the surface of the concrete member matrix in the tidal range area is immediately carried out from the moment when the tide falls from a high tide line, and the treatment on the surface of the concrete member matrix above the water surface is completed after the tide falls to a lowest working surface or within 30min before the low tide line;
measuring the water content of the surface of the processed concrete member matrix at any time, and when the water content is more than 6%, drying and blowing the surface of the concrete matrix by using an air heater to reduce the water content to below 6%;
second step, silane impregnation
After the water content of the concrete member matrix is controlled below 6 percent, immediately brushing 1-2 times of pasty silane impregnant along the downward 200mm position from the lower part of the treatment range or the upward direction of the horizontal plane, wherein the dosage is 200-2Controlling the single-pass dipping operation time in the tidal range region within 5min to finally form a silane dipping layer;
third, priming treatment
Coating the pasty silane impregnant on a concrete member substrate, impregnating to form a silane impregnated layer, drying the surface of the silane impregnated layer, continuously standing for 10-15min, immediately coating 1 path of primer in the upward direction from the water surface, wherein the dosage of the primer is 80-100g/m2The film thickness is 5-10 μm, the single brush coating operation is completed within 5min, and then the drying is carried out for 5-10 min; forming a base coat;
fourthly, coating silane modified polymer sealant
After the primer is dried, immediately coating the silane modified polymer sealant in the upward direction from the water surface, and tightly filling, repairing, strickling or modifying the pits, grooves, cracks or slab staggering parts left on the surface of the concrete member matrix by using the silane modified polymer sealant; except the local repairing points, the thickness of the glue layer is generally 0.1-0.5 mm, the blade coating operation is finished within 10min, and finally the silane modified polymer sealing glue layer is formed;
fifthly, wrapping PVF adhesive tape
After finishing the blade coating operation, standing for 10-20min, immediately carrying out PVF adhesive tape wrapping operation along the upward direction from the water surface or the lower part of the treatment range of the concrete member matrix; reserving at least a silane modified polymer sealing adhesive layer with the height of 200mm at the lower part of the PVF adhesive tape, wrapping the PVF adhesive tape with the concrete member matrix twice along the horizontal position, then wrapping the PVF adhesive tape upwards along the concrete member matrix in a spiral mode, wrapping the PVF adhesive tape with the concrete member matrix twice along the horizontal position when the upper part of the treatment range of the concrete member matrix is finished, and overlapping and transiting the PVF adhesive tape with the surface of the concrete member matrix; the lapping position of the PVF adhesive tape wrapping layer should exceed the upper part of a splash zone or the highest tide zone of astronomical tide to form the PVF adhesive tape wrapping layer.
Example 6
On the basis of example 5, the knife coating of the silane modified polymer sealant can be performed underwater if necessary, and the specific steps are as follows:
cleaning the surface floating ash, floating slurry, slag inclusion, moss, marine life and loose parts at the lower limit of the tidal range of the concrete member matrix or in the range of 300mm underwater by adopting a manual or mechanical polishing method, ensuring the cleanness and firmness of the surface of the concrete member matrix, and treating the surface of the concrete member matrix by remaining pits, grooves, cracks and slab staggering;
coating the silane modified polymer sealant in a scraping manner, namely quickly beating or scraping the silane modified polymer sealant to the surface of concrete by adopting a glue gun gluing manner or a scraper scraping manner, and slowly pressing and scraping the silane modified polymer sealant to the surface of a concrete member matrix at a constant speed; the thickness of the adhesive layer is controlled to be 0.5-3 mm.
When the silane modified polymer sealant is coated by blade coating in underwater operation, the included angle between the plane of the pressing scraper and the surface of the concrete member matrix or the tangent line of the cambered surface of the concrete member matrix is less than 30 degrees, and the preferred included angle is less than 15 degrees.
The fifth step of wrapping the PVF adhesive tape is marked as primary wrapping after the wrapping is finished, secondary wrapping can be performed according to needs, when the secondary wrapping is performed, the surface of the wrapped PVF adhesive tape is required to be clean and dry, spiral wrapping is adopted, the central position of the secondary wrapped PVF adhesive tape is required to be aligned to the joint position of the PVF adhesive tape left during the primary wrapping, and adjacent adhesive tapes are overlapped by 30% during the secondary wrapping; the secondary wrapping operation must be completed before the surge rises.
Claims (6)
1. A method for wrapping and protecting concrete members in a tidal range area is characterized by comprising the following steps: the method comprises the following steps:
first, substrate treatment
Cleaning floating ash, floating slurry, slag inclusion, moss and loose parts on the surface of a concrete member matrix to be protected by adopting a high-pressure fresh water, sand blasting or manual polishing method, wherein the surface of the concrete member matrix is clean and firm; the surface of the concrete member substrate comprises pits, grooves, cracks and slab staggering left after treatment; the upper part and the lower part of the matrix processing range of the concrete member can exceed the design range by more than 200 mm;
when the concrete member matrix is treated, the treatment is carried out from an atmospheric area, a splash area and a tidal range area from top to bottom along the surface of the concrete member matrix, the treatment on the surface of the concrete member matrix in the tidal range area is immediately carried out from the moment when the tide falls from a high tide line, and the treatment on the surface of the concrete member matrix above the water surface is completed after the tide falls to a lowest working surface or within 30min before the low tide line;
measuring the water content of the surface of the processed concrete member matrix at any time, and when the water content is more than 6%, drying and blowing the surface of the concrete matrix by using an air heater to reduce the water content to below 6%;
second step, silane impregnation
After the water content of the concrete member matrix is controlled below 6 percent, immediately brushing 1-2 times of pasty silane impregnant along the downward 200mm position from the lower part of the treatment range or the upward direction of the horizontal plane, wherein the dosage is 200-2Controlling the single-pass dipping operation time in the tidal range region within 5min to finally form a silane dipping layer;
third, priming treatment
Coating the pasty silane impregnant on a concrete member substrate, impregnating to form a silane impregnated layer, drying the surface of the silane impregnated layer, continuously standing for 10-15min, immediately coating 1 path of primer in the upward direction from the water surface, wherein the dosage of the primer is 80-100g/m2The film thickness is 5-10 μm, the single brush coating operation is completed within 5min, and then the drying is carried out for 5-10 min; forming a base coat;
fourthly, coating silane modified polymer sealant
After the primer is dried, immediately coating the silane modified polymer sealant in the upward direction from the water surface, and tightly filling, repairing, strickling or modifying the pits, grooves, cracks or slab staggering parts left on the surface of the concrete member matrix by using the silane modified polymer sealant; except the local repairing points, the thickness of the glue layer is generally 0.1-0.5 mm, the blade coating operation is finished within 10min, and finally the silane modified polymer sealing glue layer is formed;
fifthly, wrapping PVF adhesive tape
After finishing the blade coating operation, standing for 10-20min, immediately carrying out PVF adhesive tape wrapping operation along the upward direction from the water surface or the lower part of the treatment range of the concrete member matrix; reserving at least a silane modified polymer sealing adhesive layer with the height of 200mm at the lower part of the PVF adhesive tape, wrapping the PVF adhesive tape with the concrete member matrix twice along the horizontal position, then wrapping the PVF adhesive tape upwards along the concrete member matrix in a spiral mode, wrapping the PVF adhesive tape with the concrete member matrix twice along the horizontal position when the upper part of the treatment range of the concrete member matrix is finished, and overlapping and transiting the PVF adhesive tape with the surface of the concrete member matrix; the lapping position of the PVF adhesive tape wrapping layer should exceed the upper part of a splash zone or the highest tide zone of astronomical tide to form the PVF adhesive tape wrapping layer;
the silane modified polymer sealant does not contain any plasticizer, and comprises the following raw materials in parts by weight: 40-60 parts of silane modified polymer resin, 30-50 parts of nano calcium carbonate, 0.2-2 parts of hydrophobic fumed silica, 2-5 parts of a water removing agent, 1-2 parts of an adhesion promoter and 0.5-1 part of a catalyst, and is prepared by adopting a low-temperature chemical water removal process;
the silane modified polymer resin is silane modified polyether resin MS, silane modified polyurethane resin SPUR or silane modified resin STP; the water removing agent is vinyl trimethoxy silane; the adhesion promoter is epoxy silane or amino silane; the catalyst is organic tin or chelated tin;
the silane impregnant is isobutyl triethoxysilane or isooctyl triethoxysilane;
the primer is a primer product for sealing the joint of the existing assembly type building.
2. The method for preventing the concrete member in the tidal range area from being wrapped according to claim 1, wherein the method comprises the following steps: the silane modified polymer sealant also comprises an antirust sheet material accounting for 5-10% of the total weight of the silane modified polymer sealant and cellulose acetate butyrate accounting for 0.1-1% of the total weight of the silane modified polymer sealant;
the antirust flaky material is flaky zinc powder or flaky aluminum powder.
3. The method for preventing the concrete member in the tidal range area from being wrapped according to claim 1, wherein the method comprises the following steps: the thickness of the PVF adhesive tape is 0.125-0.25mm, and the winding overlapping width of the PVF adhesive tape is 30-50% of the tape width.
4. The method for preventing the concrete member in the tidal range area from being wrapped according to claim 1, wherein the method comprises the following steps: the PVF adhesive tape can also be wound and packaged along the direction of the water surface in the atmospheric region; wrapping the adhesive tape at least twice along the horizontal position of the atmospheric region on the concrete member matrix, and then spirally wrapping the adhesive tape downwards along the concrete member matrix, wherein adjacent adhesive tapes are overlapped according to 30-50 percent; wrapping the concrete member along the horizontal position for two or more times when the lower part of the matrix treatment range of the concrete member is finished; the lower end part of the PVF adhesive tape can be provided with a silane modified polymer sealing adhesive layer with the height of more than 200 mm.
5. The method for preventing the concrete member in the tidal range area from being wrapped according to claim 1, wherein the method comprises the following steps: the fifth step of wrapping the PVF adhesive tape is marked as primary wrapping after the wrapping is finished, secondary wrapping can be performed according to needs, when the secondary wrapping is performed, the surface of the wrapped PVF adhesive tape is required to be cleaned and dried, spiral wrapping is adopted, the central position of the secondary wrapped PVF adhesive tape is required to be aligned to the joint position of the PVF adhesive tape left during the primary wrapping, and the adjacent adhesive tapes are overlapped according to 10% -30% during the secondary wrapping; the secondary wrapping operation must be completed before the surge rises.
6. The method for preventing the concrete member in the tidal range from being wrapped according to claim 2, wherein the method comprises the following steps: the preparation method of the silane modified polymer sealant comprises the following steps:
weighing the silane modified polymer sealant according to the proportion of the raw materials, firstly adding the silane modified polymer resin into a clean and dry double-planet stirrer, then sequentially adding hydrophobic fumed silica, nano calcium carbonate, cellulose acetate butyrate and 30-50% of water removal agent by weight, vacuumizing, and stirring and dispersing for 10-30min at the rotating speed of 50-100 rpm; gradually heating to 50-70 deg.C, stirring at 1000-; adding antirust sheet material, stirring at vacuum temperature below 40 deg.C and rotation speed of 200-; adding adhesion promoter, and stirring at vacuum temperature below 40 deg.C and rotation speed of 200-; finally adding a catalyst, continuously stirring for 10-20min at the rotation speed of 200-300rpm under vacuum at the temperature of below 40 ℃, discharging, sealing and packaging to obtain the silane modified polymer sealant.
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| CN201872393U (en) * | 2010-10-14 | 2011-06-22 | 江苏中矿大正表面工程技术有限公司 | Concrete protective coating structure |
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Denomination of invention: A wrapping protection method for concrete components in tidal range areas Effective date of registration: 20231122 Granted publication date: 20200911 Pledgee: Industrial Bank Co.,Ltd. Shanghai Hongkou sub branch Pledgor: SHANGHAI QIHAI ANTI-CORROSION ENGINEERING TECHNOLOGY Co.,Ltd. Registration number: Y2023310000760 |