CN103061252A - Anti-corrosion material for piers of sea-crossing bridge - Google Patents
Anti-corrosion material for piers of sea-crossing bridge Download PDFInfo
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Abstract
The invention discloses an anti-corrosion material for piers of a sea-crossing bridge. The anti-corrosion material includes a layer of anti-permeability material, a layer of reinforcing material and a layer of wear-resistant material, wherein the anti-permeability material is pure polyurea, the reinforcing material is formed by epoxy resin, alumina powder and zinc oxide powder, the wear-resistant material is composed of epoxy resin and added silicon carbide granularity sand particles. Isocyanate A component reacts with mixed resin B component to form the pure polyurea, the content of the alumina powder and the content of the zinc oxide powder respectively account for five to fifteen percent of the reinforcing material, and the ratio between the weights of epoxy resin and silicon carbide granularity sand in the wear-resistant material is 1:1.5 to 3.5. The anti-corrosion material for piers of the sea-crossing bridge has the advantages of excellent adaptability to severe environments of the ocean, excellent erosive wear resistant and ageing resistant properties, small construction difficulty and low costs, and convenience in usage and maintenance so that the safety of concrete constructions of piers of sea-crossing bridges is guaranteed.
Description
Technical field
The present invention relates to a kind of anti-corrosion material, particularly the anti-corrosion material on bridge spanning the sea concrete pier surface in maritime works's engineering.
Background technology
Development of Marine economy becomes the important growth point of a country development day by day, bridge spanning the sea is as the important marine engineering of present stage China, the current national economic development and traffic environment had material impact, but, abominable marine environment has caused heavy economic losses to the corrosion failure of building, some corrosion data that the state such as Japanese, Canadian announces show, the direct economic loss that corrosion causes accounts for 1%～4% of total value of production in national economy, the iron and steel of annual rust corrosion accounts for 20% of annual production, and about 30% equipment is scrapped because of corrosion.In China, the economic loss that annual corrosion causes accounts for 4% of gross national product, surpasses fire, disaster caused by a windstorm and the damnous summation of earthquake.
Exposed reinforced concrete structure can be subject to the corrosivenesses such as washing away of salt corrosion, corrosion of steel bar, wave in marine environment, also can be subject to the destruction of the extremely strong freeze thawing circulation of harmfulness in northern marine site, after building up 5～8 years, just begin to occur the phenomenons such as crack, reinforcement corrosion.The repairing and reinforcement work in later stage not only expends a large amount of manpower and materials, and also serious threat people's safety of life and property of the structural failure problem that thereupon occurs.Be in abominable Service Environment for this class of bridge spanning the sea, the building that is a fundamental task crucial for generations to come simultaneously must adopt efficient permanent guard technology and protective materials, to guarantee its durability and safety.It is significant and far-reaching that bridge spanning the sea is carried out anticorrosion Protective Research.
From reason, the impact of bridge spanning the sea envirment factor couplings such as mechanical stress, freeze thawing circulation, alternation of wetting and drying, corrosive medium in bearing natural environment, the erosive wear that contains at a high speed the silt current also will be born in the part, impact kinetic energy and the intensity of the partial water Velocity Field of Flow that it bears, large I is up to upper gpa, even reach MPas up to ten thousand, thereby produce serious cavitation erosion.Wherein, the erosion of high-velocity flow and abrasive grain produces serious erosive wear to it.In addition, bridge spanning the sea also exists in work progress and rolls leakiness, the inhomogeneous stress cracking that causes of hydration heat of cement conduction, under high-velocity flow, further be out of shape, ftracture, form leakage passage, increase fluid resistance, accelerate erosive wear, the safety and stability of serious harm bridge spanning the sea is badly in need of taking effective safeguard procedures.
The measure of existing raising durability generally is divided into two large classes: the first kind is basic measures, as adopt high performance concrete etc., yet concrete itself is a kind of porous material, has permeability, can't stop the infiltration of moisture and hazardous substances, worsen, peel off or destroyed by the deep layer that surface damage causes so the top layer finally can occur.Equations of The Second Kind is addition thereto, and comprising increases thickness of concrete cover, concrete surface coating protection, employing special reinforcing steel (such as epoxy-coated reinforcement, stainless steel rebar etc.), cathode protection technology and use reinforcing steel bar corrosion inhibitor protection etc.Although prior art has certain protection effect, they still can't satisfy the requirement of overlength durability in the abominable Service Environment of bridge spanning the sea.
Therefore, for the characteristics of maritime works's engineering, design that a kind of cost is lower, easy construction, existing good decay resistance, the anti-corrosion material that has again resistance to erosion, abrasion resistance properties is very important, thereby realizes the extra long life of bridge spanning the sea.
Summary of the invention
The objective of the invention is in order to overcome the prior art above shortcomings, a kind of bridge pier over the sea anti-corrosion material is provided, comprise three layers of seepage resistant material, reinforcing material and high-abrasive materials, its difficulty of construction is little, with low cost, favorable anti-corrosion effect, anti-wear performance is good, the life-span is long, easy to maintenance, the adverse circumstances that can adapt to well maritime works's engineering, resist effectively that external force, internal stress are destroyed and and resist saline solution corrosion or alluvion, can effectively solve and prolong matrix application life.
To achieve these goals, the present invention adopts following technical proposals:
A kind of bridge pier over the sea anti-corrosion material comprises three layers of seepage resistant material, reinforcing material and high-abrasive materials, wherein:
Seepage resistant material is pure polyureas;
Reinforcing material is made of epoxy resin and alumina powder, Zinc oxide powder;
High-abrasive material adds carborundum granularity sand particle by epoxy resin and forms;
Wherein, pure polyureas is generated by isocyanates A component and hybrid resin B component reaction, in the reinforcing material alumina powder, Zinc oxide powder separately content be 5～15% of reinforcing material, usage ratio is epoxy resin in the high-abrasive material: carborundum granularity sand=1:1.5～3.5.
Pure polyureas: be a kind of new concrete protective materials, can form whole densification, continuous jointless high strength, high resiliency coating after the moulding, the excellent properties such as, freeze thawing resistance corrosion-resistant with it, marine climate resistant wear out, antiseep, erosion resistant, shock resistance, antifatigue destruction have shown huge advantage.
Polyurea coating or elastic body are the materials that is generated by isocyanates A component and hybrid resin B component reaction.The A component can be aromatic isocyanate, also can be aliphatic isocyanates; Can be modification derivant, semi-prepolymer or the prepolymer of isocyanate-monomer, polymer, isocyanates.Isocyanate prepolymer or semi-prepolymer are to get by holding amino (perhaps terminal hydroxy group) polyethers and isocyanate reaction.The B component is comprised of amine terminated polyether, the amino chain extender of end, must not artificially introduce hydroxy compounds in the amine terminated polyether, but allows the micro-hydroxylated material existence of non-complete ammonification in the ammonifying process.The B component can contain coating additive (perhaps being referred to as non-main component), and these auxiliary agents allow to contain hydroxyl, for example: pigment dispersing agent.Usually, the B component must not contain catalyzer.Polyureas product according to above-mentioned definition preparation is called again pure polyureas.
Epoxy resin: the macromolecular compound that contains epoxide group in all molecular structures is referred to as epoxy resin.Epoxy resin after the curing has good physics, chemical property, it has excellent adhesive strength to the surface of metal and nonmetals, dielectric properties are good, the set shrinkage factor is little, the product size good stability, and hardness is high, pliability is better, to alkali and most of solvent-stable, thereby be widely used in national defence, each department of national economy, make the purposes such as cast, dipping, lamination material, bonding agent, coating.
Alumina powder: the alumina fusing point is high, hardness large, excellent insulation performance, thermal structure is stable, antioxygenic property is good, but deficiency is also arranged, and that is exactly that fragility is larger, so adopt the superfines alumina to improve fracture and the toughness of anticorrosive paint.
Zinc oxide: hardness is about 4.5H, is kind of a relatively soft material, and heat stability and the heat conductivity of zinc oxide are better, and boiling point is high, and coefficient of thermal expansion is low, just has place to show one's prowess in the material field at pottery, can reduce the hardening time of acid-fast alkali-proof anticorrosive paint, and improve the water resistance of coating.Zinc oxide can reflected infrared ray, reaches insulation or heat insulation effect.Especially nano zine oxide can shield the ultraviolet ray with potential hazard, thereby prolongs the weatherability of coating.
Carborundum: be that a kind of elevated temperature strength is high, abrasion resistance is good, acid-fast alkali-proof, the Inorganic Non-metallic Materials that hardness height and chemical stability are good, the adding of carborundum can improve rupture strength and the abrasion resistance of sample greatly, when matrix is less between the particle, the slit is less between particle and the particle, so close structure, mechanical strength is higher, and abrasion resistance is also better, therefore, the addition of carborundum is a key factor that affects acid-fast alkali-proof anticorrosive paint mechanical performance.Because stable chemical performance, coefficient of thermal conductivity are high, coefficient of thermal expansion is little, anti-wear performance good, except making abrasive material usefulness, also have a lot of other purposes, for example: with special process silicon carbide powder is coated the inwall of turbine impeller or cylinder block, can improve its abrasion resistance and increase the service life 1～2 times; In order to the high grade refractory of making, resistance to thermal shock, volume is little, lightweight and intensity is high, good energy-conserving effect.
In the high-abrasive material, what play corrosion-resistant effect mainly is resin, and wear-resistant and flushing resistance be arranged, must rely on wherein filler and special prescription.
The match ratio of high-abrasive material is extremely crucial, and the ratio of resin is too high, and its anti-wear performance does not reach the highest; The ratio of resin is excessively low, and the abrasion resistant particles ratio is too high, and anti-wear performance can increase, but its anti-permeability performance reduces again; In addition, the specification of abrasion resistant particles, size, shape that comprises particle diameter etc. all can affect anti-permeability performance.
Preferably, usage ratio is epoxy resin in the high-abrasive material: carborundum granularity sand=1:2.5.
According to this specification ratio prescription, the anticorrosion antiwear layer compactness of formation, abrasion resistance are better, and grating is effective, can fully resist washing away of the erosion of seawater and sea wind, sand and dust.Impermeability, abrasion resistance, fine corrosion resistance, workability are also good.
Described hybrid resin B is comprised of amine terminated polyether, the amino chain extender of end, and the amino chain extender of described end is IPD.
Hybrid resin B component is comprised of amine terminated polyether, the amino chain extender of end, must not artificially introduce hydroxy compounds in the amine terminated polyether, but allows the micro-hydroxylated material existence of non-complete ammonification in the ammonifying process.
The inventor has investigated the impact of chain extender on polyureas morphosis and performance, has used respectively IPD (IPDA), ethylenediamine (EDA) and three kinds of chain extenders of hexamethylene diamine (HDA) to synthesize the polyureas of different structure.The result shows, compares with polyureas with the polyurethane-urea of EDA and HDA chain extension, and the hydrogen bonding degree of allophanyl is lower in the polyureas of IPDA chain extension, and soft section better with hard intersegmental mutually mixability; The polyureas of IPDA chain extension has better hot strength, hardness and tearing strength simultaneously, but elongation at break is lower.EDA compares with the polyureas of HDA chain extension, and both are more or less the same at performance.
Described epoxy resin is modified epoxy.
Described modified epoxy is vinyl ester resin.
Vinyl ester resin is a class denaturation loop epoxy resins that is obtained by bisphenol type or phenol aldehyde type epoxy resin and metering system acid reaction, is commonly called vinyl ester resin (VE), and the another name epoxy acrylic resin is thermosetting resin.Vinyl ester resin has acted on the good characteristic of epoxy resin, and curing property and mouldability aspect are more outstanding, can be dissolved in styrene and acrylic monomer, owing to have epoxy and undersaturated advantage concurrently.
Compared with prior art, the invention has the beneficial effects as follows:
1, the compliance of excellent ocean severe environment.The life-span of pure polyureas is more than 75 years, the macro property that experimental results show that the pure polyurea coating of long period of soaking in seawater and metabisulfite solution does not significantly reduce, its erosion to chlorion, sulfate has obvious inhibition, can significantly improve the corrosive nature of concrete anti-seawater and sulfate; Pure polyurea coating through 180 drying and watering cycles and freeze thawing circulation after the coating hot strength only descended respectively 4% and 9%, elongation at break all gos up to some extent, good mechanical property conservation rate is arranged, epoxy resin and alumina zinc oxide all have excellent alkaline resistance properties, and anti-corrosion material of the present invention can fully guarantee the concrete substrate structural safety.
2, the wearing and tearing of outstanding Anti-erosion and ageing-resistant performance: anticorrosion antiwear layer impermeability, abrasion resistance, fine corrosion resistance that epoxy resin collocation silicon carbide filler forms, grating is effective, can fully resist washing away of the erosion of seawater and sea wind, sand and dust.Carborundum can improve rupture strength and the abrasion resistance of sample greatly, and when matrix was less between the particle, the slit was less between particle and the particle, so close structure, and mechanical strength is higher, and abrasion resistance is also better.Anti-corrosion material of the present invention can effectively prevent the damage of coating cracking and external force, and the mechanics that it is excellent and anti-wear performance can guarantee that coating effectively resists the collision of exterior object, grazing, keep integrality, closure and the durability of coating.
3, difficulty of construction is little, with low cost, use and keep in repair also very convenient: spray pure polyureas technology and adopt the construction of mechanization continuous spray, once construction can reach the thickness requirement of design, curing rate is fast, can reached several millimeters coating by construction body surface formation thickness rapidly, and when vertical body surface construction, do not produce the sagging phenomenon, can come into operation after finishing application at once, have 100% solid content, the curing of coatings process can be as traditional coating towards periphery environment volatile organic compound (VOC) affect environment; The coating that anti-corrosion material of the present invention forms is fine and close and continuous; protected concrete structure and extraneous corrosive medium can be kept apart; play effective protective effect; can effectively solve corrosion and the wear-out failure that bridge pier over the sea is prone to most; prolong anticorrosive coat application life, can reduce to a great extent maintenance cost.
The specific embodiment
Below in conjunction with the specific embodiment foregoing invention content of the present invention is described in further detail.But this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to following embodiment.Not breaking away from the above-mentioned technological thought situation of the present invention, according to ordinary skill knowledge and customary means, make various replacements and change, all should comprise within the scope of the invention.
Following examples are all tested at Jiaozhou Bay, Jiaozhou Bay year, extreme difference in temperature can reach 50 ℃, about 2 months of ice period, seawater salinity scope 29.4%～32.9%, be subjected in addition the comprehensive function of the multiple corrosion factors such as moving loads, salt fog, typhoon, heavy rain, industrial emissions, corrosive environment is abominable more than other marine sites of China, only depends on conventional preventive means can't reach the corrosion protection requirement, must adopt advanced coating technology to protect.
Embodiment 1
Present embodiment bridge pier over the sea anti-corrosion material comprises three layers of seepage resistant material, reinforcing material and high-abrasive materials, wherein:
Seepage resistant material is pure polyureas;
Reinforcing material is made of epoxy resin and alumina powder, Zinc oxide powder;
High-abrasive material adds carborundum granularity sand particle by epoxy resin and forms;
Wherein, pure polyureas is generated by isocyanates A component and hybrid resin B component reaction, in the reinforcing material alumina powder content be reinforcing material 8%, Zinc oxide powder content is 5% of reinforcing material, usage ratio is epoxy resin in the high-abrasive material: carborundum granularity sand=1:3.0.
Described hybrid resin B is comprised of amine terminated polyether, the amino chain extender of end, and the amino chain extender of described end is IPD.
Described epoxy resin is modified epoxy.
Described modified epoxy is vinyl ester resin.
The experiment proved that, concrete pier washes away erosion after 1 year through seawater, misty rain, particle, corrosion resistance is relatively good, the contour structures of integral material does not almost have variation, but surface carborundum has the protrusion phenomenon, corrosion resistance, abrasion resistance and compactness that anti-corrosion material is described are excellent, but solid material (carborundum) ratio is bigger than normal slightly.
Embodiment 2
Present embodiment bridge pier over the sea anti-corrosion material comprises three layers of seepage resistant material, reinforcing material and high-abrasive materials, wherein:
Seepage resistant material is pure polyureas;
Reinforcing material is made of epoxy resin and alumina powder, Zinc oxide powder;
High-abrasive material adds carborundum granularity sand particle by epoxy resin and forms;
Wherein, pure polyureas is generated by isocyanates A component and hybrid resin B component reaction, in the reinforcing material alumina powder content be reinforcing material 10%, Zinc oxide powder content is 15% of reinforcing material, usage ratio is epoxy resin in the high-abrasive material: carborundum granularity sand=1:2.5.
Described hybrid resin B is comprised of amine terminated polyether, the amino chain extender of end, and the amino chain extender of described end is IPD.
Described epoxy resin is modified epoxy.
Described modified epoxy is vinyl ester resin.
The experiment proved that, concrete pier washes away erosion after 2 years through seawater, misty rain, particle, and corrosion resistance is relatively good, and the contour structures of integral material does not almost have variation, the contour structures of integral material does not almost have variation, and material thickness, surface finish are substantially front the same with use.Corrosion resistance, abrasion resistance and compactness that anti-corrosion material is described are excellent, and epoxy resin selects vinyl ester resin to improve performance, and fluent material in the high-abrasive material (vinyl ester resin) and solid material (carborundum) ratio are suitable.
Embodiment 3
Present embodiment bridge pier over the sea anti-corrosion material comprises three layers of seepage resistant material, reinforcing material and high-abrasive materials, wherein:
Seepage resistant material is pure polyureas;
Reinforcing material is made of epoxy resin and alumina powder, Zinc oxide powder;
High-abrasive material adds carborundum granularity sand particle by epoxy resin and forms;
Wherein, pure polyureas is generated by isocyanates A component and hybrid resin B component reaction, in the reinforcing material alumina powder content be reinforcing material 15%, Zinc oxide powder content is 10% of reinforcing material, usage ratio is epoxy resin in the high-abrasive material: carborundum granularity sand=1:3.5.
Described hybrid resin B is comprised of amine terminated polyether, the amino chain extender of end, and the amino chain extender of described end is IPD.
Described epoxy resin is modified epoxy.
Described modified epoxy is vinyl ester resin.
The experiment proved that concrete pier washes away erosion after 2 years through seawater, misty rain, particle, corrosion resistance is relatively good, the contour structures of integral material does not almost have variation, the contour structures of integral material does not almost have variation, material thickness, front the same with use, but surface carborundum protrusion phenomenon is obvious.Corrosion resistance, abrasion resistance and compactness that anti-corrosion material is described are excellent, but solid material (carborundum) ratio is bigger than normal slightly.
Embodiment 4
Present embodiment bridge pier over the sea anti-corrosion material comprises three layers of seepage resistant material, reinforcing material and high-abrasive materials, wherein:
Seepage resistant material is pure polyureas;
Reinforcing material is made of epoxy resin and alumina powder, Zinc oxide powder;
High-abrasive material adds carborundum granularity sand particle by epoxy resin and forms;
Wherein, pure polyureas is generated by isocyanates A component and hybrid resin B component reaction, in the reinforcing material alumina powder content be reinforcing material 5%, Zinc oxide powder content is 10% of reinforcing material, usage ratio is epoxy resin in the high-abrasive material: carborundum granularity sand=1:1.5.
Described hybrid resin B is comprised of amine terminated polyether, the amino chain extender of end, and the amino chain extender of described end is IPD.
Described epoxy resin is modified epoxy.
Described modified epoxy is vinyl ester resin.
The experiment proved that concrete pier washes away erosion after 1 year through seawater, misty rain, particle, corrosion resistance is relatively good, the contour structures of integral material does not almost have variation, the contour structures of integral material almost not to change, but abrasion resistance and compactness have slight change, and the surface has tiny uneven.This explanation high-abrasive material proportioning does not reach best, and fluent material in the high-abrasive material (vinyl ester resin) ratio is bigger than normal slightly.
In sum, show that bridge pier over the sea of the present invention has the compliance of excellent ocean severe environment, outstanding Anti-erosion wearing and tearing with anti-corrosion material and ageing-resistant performance and difficulty of construction is little, with low cost, use and keep in repair also very easily characteristics, can guarantee bridge pier concrete structure safety.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. bridge pier over the sea anti-corrosion material is characterized in that: comprise three layers of seepage resistant material, reinforcing material and high-abrasive materials, wherein:
Seepage resistant material is pure polyureas;
Reinforcing material is made of epoxy resin and alumina powder, Zinc oxide powder;
High-abrasive material adds carborundum granularity sand particle by epoxy resin and forms;
Wherein, pure polyureas is generated by isocyanates A component and hybrid resin B component reaction, in the reinforcing material alumina powder, Zinc oxide powder separately content be 5～15% of reinforcing material, usage ratio is epoxy resin in the high-abrasive material: carborundum granularity sand=1:1.5～3.5.
2. bridge pier over the sea anti-corrosion material according to claim 1, it is characterized in that: usage ratio is epoxy resin in the high-abrasive material: carborundum granularity sand=1:2.5.
3. bridge pier over the sea anti-corrosion material according to claim 1 is characterized in that: described hybrid resin B is comprised of amine terminated polyether, the amino chain extender of end, and the amino chain extender of described end is IPD.
4. bridge pier over the sea anti-corrosion material according to claim 1, it is characterized in that: described epoxy resin is modified epoxy.
5. bridge pier over the sea anti-corrosion material according to claim 4, it is characterized in that: described modified epoxy is vinyl ester resin.
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| CN103321146A (en) * | 2013-07-03 | 2013-09-25 | 天津城建大学 | Replaceable anticorrosion device for bridge pier in splash zone |
| CN104177986A (en) * | 2014-09-10 | 2014-12-03 | 江苏欣安新材料技术有限公司 | Aluminum-zinc composite paint and construction technique thereof |
| CN105696475A (en) * | 2016-02-04 | 2016-06-22 | 合肥卡勒斯通建筑材料有限公司 | Nanotechnology protection method for existing bridge structures |
| CN108753069A (en) * | 2018-06-20 | 2018-11-06 | 江苏爱可青实业有限公司 | Corrosion-resistant guardrail and preparation method thereof |
| CN115558387A (en) * | 2022-09-06 | 2023-01-03 | 安徽先进建筑材料研究院有限公司 | Wear-resistant lining coating of dry-mixed mortar stirrer and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105696475A (en) * | 2016-02-04 | 2016-06-22 | 合肥卡勒斯通建筑材料有限公司 | Nanotechnology protection method for existing bridge structures |
| CN108753069A (en) * | 2018-06-20 | 2018-11-06 | 江苏爱可青实业有限公司 | Corrosion-resistant guardrail and preparation method thereof |
| CN115558387A (en) * | 2022-09-06 | 2023-01-03 | 安徽先进建筑材料研究院有限公司 | Wear-resistant lining coating of dry-mixed mortar stirrer and preparation method thereof |
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Application publication date: 20130424 |