CN116273800A - Complete set anti-corrosion construction method for marine environment bridge member - Google Patents
Complete set anti-corrosion construction method for marine environment bridge member Download PDFInfo
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- CN116273800A CN116273800A CN202310117389.7A CN202310117389A CN116273800A CN 116273800 A CN116273800 A CN 116273800A CN 202310117389 A CN202310117389 A CN 202310117389A CN 116273800 A CN116273800 A CN 116273800A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
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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
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2518/00—Other type of polymers
- B05D2518/10—Silicon-containing polymers
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/24—Sea water resistance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to a complete set of anti-corrosion construction method for bridge members in marine environments, and belongs to the technical field of building material anti-corrosion. Firstly, water spraying cleaning is carried out on the concrete surface of the bridge member, then the concrete defect is repaired, then a concrete protection layer is applied, the concrete protection layer is polished, and finally silane paste permeability primer, silicone resin color difference regulator and silicone resin breathable finish paint are sequentially coated. The concrete material used for the concrete protective layer is added with the first-grade fly ash, slag micropowder, silica fume, polycarboxylic acid high-efficiency water reducer, composite concrete rust-resistant preservative and organic silicon waterproof agent, the thickness of the concrete protective layer is controlled, and the bridge member after corrosion prevention treatment has better mechanical property and chlorine ion permeation resistance by combining silane paste permeation primer and the coating of silicone resin permeation type finishing paint.
Description
Technical Field
The invention belongs to the technical field of building material corrosion prevention, and relates to a complete set of marine environment bridge member corrosion prevention construction method.
Background
The reasonable and effective anti-corrosion measures have important influence on the durability of the bridge in the marine environment, and at present, with respect to the offshore environment of the reinforced concrete structure bridge or in the marine environment, different anti-corrosion measures and methods can be adopted according to different environment areas and structural parts. Common anti-corrosion measures include concrete surface coating, silane impregnation, concrete impressed current cathodic protection, epoxy resin coated steel bars, hot dip galvanized steel bars, stainless steel bars, coated stainless steel bars, steel bar rust inhibitors, water permeable templates, hydrophobic compound pore plugs, spray polyurea elastomers, and the like. The corresponding anti-corrosion measures are adopted in the initial stage of the construction of the structure, so that the durability of the structure can be remarkably improved, and good economic benefits are obtained.
Reinforcement corrosion is the most significant factor causing concrete failure, and is one of the most significant problems faced by concrete structures. Most high performance concrete structures are damaged by corrosion of the steel bar caused by penetration of chloride ions into the surface of the concrete steel bar and reaching a certain critical concentration. The strength of the concrete structure is also an important factor affecting the durability of the reinforced concrete, so how to reduce the chloride ion permeability and improve the strength of the concrete structure plays a vital role in the durability of the bridge in the marine environment of the reinforced concrete structure.
Disclosure of Invention
The invention aims to provide a complete set of anti-corrosion construction method for a bridge component in a marine environment, and belongs to the technical field of building material anti-corrosion. Firstly, water spraying cleaning is carried out on the concrete surface of the bridge member, then the concrete defect is repaired, then a concrete protection layer is applied, the concrete protection layer is polished, and finally silane paste permeability primer, silicone resin color difference regulator and silicone resin breathable finish paint are sequentially coated. The concrete material used for the concrete protective layer is added with the first-grade fly ash, slag micropowder, silica fume, polycarboxylic acid high-efficiency water reducer, composite concrete rust-resistant preservative and organic silicon waterproof agent, the thickness of the concrete protective layer is controlled, and the bridge member after corrosion prevention treatment has better mechanical property and chlorine ion permeation resistance by combining silane paste permeation primer and the coating of silicone resin permeation type finishing paint.
The aim of the invention can be achieved by the following technical scheme:
a complete set of anti-corrosion construction method for a bridge component in a marine environment comprises the following steps:
(1) And (3) water spraying cleaning: spraying water by a high-pressure water gun to clean the surface of the bridge member concrete;
(2) Defect repair: judging the defective concrete according to visual inspection, cutting, removing and treating pores, cracks, staggered platforms and the like on the surface, and then repairing;
(3) Applying a concrete protective layer: applying concrete protection layers with different raw material ratios and different thicknesses to different parts of the repaired bridge member;
(4) And (3) brushing an organosilicon concrete protective agent: and (3) sequentially brushing a silane paste permeable primer, a silicone color difference regulator and a silicone breathable finish on the surface of the concrete protective layer, and curing for 3-4d to finish the anti-corrosion construction.
As a preferable technical scheme of the invention, the age of the bridge member concrete in the step (1) is not less than 28d.
As a preferable technical scheme of the invention, the repair period before the concrete protective layer is applied in the step (3) is not less than 7d.
As a preferable technical scheme of the invention, the age of the concrete protective layer coated with the silane paste permeability primer in the step (4) is not less than 28d.
As a preferable technical scheme of the invention, the interval between the silane paste permeability primer, the silicone color difference regulator and the silicone breathable finish paint coated in the step (4) is 24-36h.
As a preferred embodiment of the present invention, the defect repair criteria in step (2) are: the pile foundation concrete is provided with cracks with the width being more than or equal to 0.1mm, the pier column and the bearing platform concrete are provided with cracks with the width being more than or equal to 0.15mm, and the capping beam, the lower edge of the bottom plate, the upper edge of the top plate and the anti-collision guardrail are all required to be repaired when the cracks with the width being more than or equal to 0.2mm are formed.
As a preferable technical scheme of the invention, the raw materials of the concrete protective layer in the step (3) comprise 205-270 parts by weight of Portland cement, 620-735 parts by weight of fine aggregate, 1125-1155 parts by weight of coarse aggregate, 93-122 parts by weight of primary fly ash, 75-100 parts by weight of slag micropowder, 80-120 parts by weight of silica fume, 4-7 parts by weight of polycarboxylic acid high-efficiency water reducer, 5.5-13 parts by weight of composite concrete rust-inhibiting preservative, 3-6 parts by weight of organosilicon waterproofing agent and 150-160 parts by weight of mixing water.
As a preferred technical scheme of the invention, the concrete protective layer applying method in the step (3) comprises the following steps: the raw materials of the concrete protection layer of the pile foundation and the collision guard comprise 205-212 parts by weight of Portland cement, 728-735 parts by weight of fine aggregate, 1140-1148 parts by weight of coarse aggregate, 93-98 parts by weight of primary fly ash, 75-78 parts by weight of slag micropowder, 80-90 parts by weight of silica fume, 4.7-5.5 parts by weight of polycarboxylic acid high-efficiency water reducer, 5.5-6.8 parts by weight of composite concrete rust-resistant preservative, 5-6 parts by weight of organosilicon waterproofing agent and 153-156 parts by weight of mixing water, wherein the thickness of the concrete protection layer of the pile foundation is 70-75mm, and the thickness of the concrete protection layer of the collision guard is 35-40mm; the raw materials of the concrete protective layers of the pier column, the bearing platform and the capping beam comprise 215-235 parts by weight of Portland cement, 680-725 parts by weight of fine aggregate, 1125-1135 parts by weight of coarse aggregate, 98-105 parts by weight of primary fly ash, 79-85 parts by weight of slag micropowder, 91-105 parts by weight of silica fume, 4-4.5 parts by weight of polycarboxylic acid high-efficiency water reducer, 7-9 parts by weight of composite concrete rust-resistant preservative, 4-5 parts by weight of organosilicon waterproofing agent and 152-158 parts by weight of mixing water, the thickness of the concrete protective layers of the pier column and the capping beam is 45-50mm, and the thickness of the concrete protective layer of the bearing platform is 65-70mm; the raw materials of the concrete protective layer at the lower edge of the bottom plate and the upper edge of the top plate comprise 250-270 parts by weight of Portland cement, 620-660 parts by weight of fine aggregate, 1145-1155 parts by weight of coarse aggregate, 115-122 parts by weight of primary fly ash, 90-100 parts by weight of slag micropowder, 110-120 parts by weight of silica fume, 6-7 parts by weight of polycarboxylic acid high-efficiency water reducer, 10-13 parts by weight of composite concrete rust-resistant preservative, 3-4 parts by weight of organosilicon waterproofing agent and 150-153 parts by weight of mixing water, and the thickness of the concrete protective layer at the lower edge of the bottom plate and the upper edge of the top plate is 35-40mm.
As a preferable technical scheme of the invention, the silicate cement is one of silicate I I type cement or ordinary silicate cement; the fine aggregate has apparent density of 2600-2700kg/m 3 Is characterized in that the river sand contains chloride ions<0.02 percent, the mud content is less than or equal to 2 percent, and the mud block content is less than or equal to 0.5 percent; the coarse aggregate is crushed stone with the particle size of 5-20mm, and the chloride ion content in the crushed stone<0.02 percent, the mud content is less than or equal to 0.5 percent, the mud block content is less than or equal to 0.25 percent, and the needle-shaped particle content is less than or equal to 7 percent.
As a preferable technical scheme of the invention, the main component of the silane paste permeation primer in the step (4) is at least one of isobutyl triethoxysilane, n-octyl triethoxysilane and isooctyl triethoxysilane, and the coating amount of the silane paste permeation primer is 150-250g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The main components of the silicone breathable finish paint are MQ silicone resin and methyl silicone oil, and the coating amount of the silicone breathable finish paint is 300-400g/m 2 。
The invention has the beneficial effects that:
(1) According to the invention, the raw material formula and the proportion of the concrete protective layer are optimized, wherein the first-grade fly ash, slag micropowder, silica fume, polycarboxylic acid high-efficiency water reducer and the organosilicon waterproofing agent of the composite concrete rust-resistant preservative are used for synergistically enhancing the mechanical property of the concrete protective layer structure and reducing the permeability of chloride ions through reasonable proportion;
(2) In theory, the thicker the concrete protective layer is, the better the durability of the concrete structure is, but in practice, shrinkage stress and temperature stress of the thicker protective layer in the hardening process can not be controlled by the steel bar, so that cracks are easily generated, the generation of the cracks greatly weakens the effect of the concrete protective layer, and the too small thickness of the concrete protective layer also leads to the reduction of the mechanical property and the increase of chloride ion permeability; therefore, the invention applies the concrete protection layers with different thicknesses to different parts of the bridge component in the marine environment, controls the proportion of the raw materials of the concrete protection layers at different parts, and simultaneously improves the mechanical property of the concrete protection layer and reduces the chloride ion permeability to the maximum on the basis of saving the raw materials.
(3) According to the invention, the micro-molecular silane coupling agent is coated on the surface of the concrete protective layer, the micro-molecular silane coupling agent has strong permeability and can penetrate into the depth of 5-10mm of the concrete protective layer, the hydrolysate of the silane coupling agent is tightly connected with the concrete protective layer, after the silicone resin color difference regulator is coated, the silicone resin breathable finish paint with main components of MQ silicone resin and methyl silicone oil is coated, the MQ silicone resin and the methyl silicone oil have good hydrophobicity, meanwhile, the methyl silicone oil is compounded with the MQ silicone resin, the compatibility of the MQ silicone resin and a finish paint matrix is enhanced, and the linear structure of the methyl silicone oil promotes the compatibility of the MQ silicone resin and the hydrolyzed silane coupling agent in the primer, so that the whole organic silicon concrete protective agent has good permeability and good waterproof and corrosion resistance.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description is given below with reference to the embodiments, structures, features and effects according to the present invention.
The polycarboxylic acid high-efficiency water reducer in the following examples and test examples is selected from polycarboxylic acid high-performance water reducer F-108 of Liaoning Kolong fine chemical Co., ltd., the composite concrete rust inhibitor is selected from YJ-R502 high-efficiency composite corrosion inhibitor of Lu' S alum mineral accelerator factory, anhui province, the organosilicon waterproof agent is organosilicon hydrophobic powder SHP-50, the first-grade fly ash is selected from the first-grade fly ash produced by Xinlong sea power plant, the particle size is 200 meshes, the slag micropowder is selected from S95 grade slag powder produced by Hebei Meini mineral products Co., ltd., and the silica fume is selected from 1250 meshes of silica fume produced by Yi mineral product processing factory in Lingshou county.
Example 1
The high-speed reconstruction and expansion engineering plum ridge super bridge and Mei Long farm No. 1 and No. 2 super bridge are positioned in the southeast of Guangdong province and close to the long sand bay to be an offshore ocean environment, and belong to the mid-latitude subtropical ocean climate with mild climate and full annual rainfall. The sea Feng county belongs to a south subtropical marine climate zone, the marine climate is obvious, the air temperature is good throughout the year, the rainfall is abundant, and the light energy and the heat are sufficient. In summer, wen Gaoyu is too much and has high humidity, southwest wind is prevalent, and weather disasters such as rain waterlogging and typhoons often occur. Short winter, slightly cool, less rain, drier, no snow and less frost. The annual average temperature is 22 ℃, and the annual average precipitation is 2389.5mm. Mei Long extra large bridge is 5487.2m in length, the lower structure type is phi 1000mm prefabricated pipe pile foundation and prefabricated assembled bent cap, and the upper structure is 16m prestressed concrete double-T beam. Mei Long the full length 3480m of the No. 1 bridge and the No. 2 bridge of the farm are divided into two structural forms, and the first structural form is consistent with the Mei Long super bridge. The second structural form is a phi 600mm precast tubular pile foundation, the square pier and the capping beam are precast, the bearing platform is cast-in-situ, and the upper structure is a 25m prestressed small box beam.
And carrying out complete anti-corrosion construction on bridge components on the Mei Long extra large bridge and Mei Long farm No. 1 and No. 2 extra large bridge, wherein the construction method comprises the following steps:
(1) And (3) water spraying cleaning: when the age of the bridge member concrete is not less than 28d, spraying water by a high-pressure water gun to clean the surface of the bridge member concrete;
(2) Defect repair: judging defective concrete according to visual inspection, wherein the pile foundation concrete is provided with cracks with the width of more than or equal to 0.1mm, the pier column and bearing platform concrete are provided with cracks with the width of more than or equal to 0.15mm, when the cover beam, the lower edge of the bottom plate, the upper edge of the top plate and the anti-collision guardrail are provided with cracks with the width of more than or equal to 0.2mm, cutting, removing and treating air holes, cracks, staggered platforms and the like on the surface, and then repairing;
(3) Applying a concrete protective layer: when the repairing age is not less than 7d, concrete protection layers with different raw material ratios and different thicknesses are applied to different parts of the repaired bridge member, and the concrete method comprises the following steps: the concrete protective layer raw material for pile foundation and protective fence comprises 210 weight parts of silicate I I type cement and 731 weight parts of apparent density 2600-2700kg/m 3 The river sand of (1) comprises 1145 parts by weight of broken stone with the grain size of 5-20mm, 95 parts by weight of primary fly ash, 76 parts by weight of slag micropowder, 86 parts by weight of silica fume, 4.9 parts by weight of polycarboxylic acid high-efficiency water reducer, 5.9 parts by weight of composite concrete rust-resistant preservative, 5.5 parts by weight of organic silicon waterproof agent and 154 parts by weight of mixing water, wherein the thickness of a concrete protection layer of a pile foundation is 75mm, and the thickness of the concrete protection layer for protecting a collision fence is 38mm; the raw materials of the concrete protective layer of the pier column, the bearing platform and the capping beam comprise 228 parts by weight of ordinary Portland cement and 718 parts by weight of apparent density 2600-2700kg/m 3 The river sand, 1131 weight part of broken stone with the diameter of 5-20mm, 101 weight part of primary fly ash, 83 weight part of slag micropowder, 99 weight part of silica fume, 4.1 weight part of polycarboxylic acid high-efficiency water reducer, 8 weight parts of composite concrete rust-resistant preservative, 4.2 weight parts of organic silicon waterproof agent and 154 weight parts of mixing water, wherein the thickness of a concrete protective layer of a pier column and a capping beam is 47mm, and the thickness of a concrete protective layer of a bearing platform is 68mm; the concrete protective layer raw material of the bottom plate lower edge and the top plate upper edge comprises 265 weight parts of ordinary Portland cement and 641 weight parts of apparent density 2600-2700kg/m 3 The river sand of (1) comprises 1149 parts by weight of broken stone with the diameter of 5-20mm, 119 parts by weight of primary fly ash, 95 parts by weight of slag micropowder, 112 parts by weight of silica fume, 6.4 parts by weight of polycarboxylic acid high-efficiency water reducer, 11 parts by weight of composite concrete rust-resistant preservative, 4 parts by weight of organosilicon waterproof agent and 152 parts by weight of mixing water, wherein the thickness of a concrete protective layer at the lower edge of a bottom plate and the upper edge of a top plate is 40mm;
(4) And (3) brushing an organosilicon concrete protective agent: when the age of the concrete protective layer is not less than 28 days, the main component of the isooctyl triethoxysilane is coated on the surface of the concrete protective layerThe coating amount of the silane paste permeable primer is 150-250g/m 2 After 24 hours, the silicone resin color difference regulator is coated, after 36 hours, the silicone resin breathable finish paint with the main components of MQ silicone resin and methyl silicone oil is coated, and the coating amount is 300-400g/m 2 And curing for 3d to finish the anti-corrosion construction.
The performance indexes of the silane paste permeability primer materials are shown in the following table 1, and the performance indexes of the silicone breathable finish paint are shown in the following table 2:
TABLE 1
TABLE 2
Test example 1
Optionally selecting Mei Long super bridge pile foundation, pier column, bearing platform, capping beam, bottom plate lower edge, top plate upper edge and crash barrier of each area of 2m of the concrete protection layer applied in step (3) and 28d of age in the embodiment 1 2 As a test area, a drill core is used for sampling, and the compressive strength, the splitting tensile strength and the static compression elastic modulus of the concrete protective layer are detected according to GB/T50081-2002 standard of a common concrete mechanical property test method, wherein the compressive strength is shown in table 3, and the splitting tensile strength and the static compression elastic modulus are shown in table 4; detecting chloride ion permeability of the concrete protective layer by adopting an electric flux rapid determination method according to the temporary technical condition of high-performance concrete of the passenger special line 050910 and the standard of ASTM C1202, wherein the standard of the chloride ion permeability determination of the ASTM C1202 is shown in the following table 5; the results of the electric flux of the concrete protective layer are shown in table 6 below.
Test example 2
The areas of the Mei Long super-large bridge pile foundation, the pier column, the bearing platform, the capping beam, the lower edge of the bottom plate, the upper edge of the top plate and the anti-collision guardrail are selected at will to be 2m 2 As a test area, it was subjected to cleaning and repair as in step (1) and step (2) in example 1, during the application of the concrete protective layer in step (3): the concrete protective layer raw material for pile foundation and protective fence comprises 210 weight parts of silicate type II cement and 731 weight parts of apparent density 2600-2700kg/m 3 The river sand of (1) comprises 1145 parts by weight of crushed stone with chlorine particle size of 5-20mm, 171 parts by weight of primary fly ash, 86 parts by weight of silica fume, 4.9 parts by weight of polycarboxylic acid high-efficiency water reducer, 5.9 parts by weight of composite concrete rust-resistant preservative, 5.5 parts by weight of organosilicon waterproof agent and 154 parts by weight of mixing water, wherein the thickness of a concrete protection layer of a pile foundation is 75mm, and the thickness of the concrete protection layer for protecting a collision fence is 38mm; the raw materials of the concrete protective layer of the pier column, the bearing platform and the capping beam comprise 228 parts by weight of ordinary Portland cement and 718 parts by weight of apparent density 2600-2700kg/m 3 The river sand, 1131 parts by weight of broken stone with the grain diameter of 5-20mm, 184 parts by weight of slag micropowder, 99 parts by weight of silica fume, 4.1 parts by weight of polycarboxylic acid high-efficiency water reducer, 8 parts by weight of composite concrete rust-resistant preservative, 4.2 parts by weight of organosilicon waterproofing agent and 154 parts by weight of mixing water, the thickness of a concrete protection layer of a pier column and a capping beam is 47mm, and the thickness of a concrete protection layer of a bearing platform is 68mm; the concrete protective layer raw material of the bottom plate lower edge and the top plate upper edge comprises 265 weight parts of ordinary Portland cement and 641 weight parts of apparent density 2600-2700kg/m 3 The river sand, 1149 parts by weight of crushed stone with the grain diameter of 5-20mm, 119 parts by weight of primary fly ash, 207 parts by weight of slag micropowder, 6.4 parts by weight of polycarboxylic acid high-efficiency water reducer, 11 parts by weight of composite concrete rust-resistant preservative, 4 parts by weight of organosilicon waterproofing agent and 152 parts by weight of mixing water, the thickness of a concrete protective layer at the lower edge of a bottom plate and the upper edge of a top plate is 40mm, and the rest steps are the same as those of the example 1. Sampling the drill core of the test area, and detecting the compressive strength, the splitting tensile strength and the static compression elastic modulus of the concrete protective layer according to GB/T50081-2002 standard of a common concrete mechanical property test method, wherein the compressive strength is shown in table 3, and the splitting tensile strength and the static compression elastic modulus are shown in table 4; according to 050910 passenger special line high performanceThe concrete temporary technical condition and ASTM C1202 standard adopt an electric flux rapid determination method to detect the chloride ion permeability of the concrete protective layer, wherein the ASTM C1202 chloride ion permeability determination standard is shown in the following table 5; the results of the electric flux of the concrete protective layer are shown in table 6 below.
Test example 3
The areas of the Mei Long super-large bridge pile foundation, the pier column, the bearing platform, the capping beam, the lower edge of the bottom plate, the upper edge of the top plate and the anti-collision guardrail are selected at will to be 2m 2 As a test area, it was subjected to cleaning and repair as in step (1) and step (2) in example 1, during the application of the concrete protective layer in step (3): the concrete protective layer raw material for pile foundation and protective fence comprises 210 weight parts of silicate type II cement and 731 weight parts of apparent density 2600-2700kg/m 3 The river sand of (1) comprises 1145 parts by weight of broken stone with the grain size of 5-20mm, 95 parts by weight of primary fly ash, 76 parts by weight of slag micropowder, 86 parts by weight of silica fume, 10.8 parts by weight of polycarboxylic acid high-efficiency water reducer, 5.5 parts by weight of organosilicon waterproofing agent and 154 parts by weight of mixing water, wherein the thickness of a concrete protection layer of a pile foundation is 75mm, and the thickness of the concrete protection layer for protecting a collision fence is 38mm; the raw materials of the concrete protective layer of the pier column, the bearing platform and the capping beam comprise 228 parts by weight of ordinary Portland cement and 718 parts by weight of apparent density 2600-2700kg/m 3 The river sand, 1131 weight part of broken stone with the diameter of 5-20mm, 101 weight part of primary fly ash, 83 weight part of slag micropowder, 99 weight part of silica fume, 12.1 weight parts of composite concrete rust-resistant preservative, 4.2 weight parts of organic silicon waterproof agent and 154 weight parts of mixing water, wherein the thickness of a concrete protective layer of a pier column and a capping beam is 47mm, and the thickness of a concrete protective layer of a bearing platform is 68mm; the concrete protective layer raw material of the bottom plate lower edge and the top plate upper edge comprises 265 weight parts of ordinary Portland cement and 641 weight parts of apparent density 2600-2700kg/m 3 The method comprises the following steps of (1) preparing river sand, 1149 parts by weight of crushed stone with the diameter of 5-20mm, 119 parts by weight of primary fly ash, 95 parts by weight of slag micropowder, 112 parts by weight of silica fume, 6.4 parts by weight of polycarboxylic acid high-efficiency water reducer, 15 parts by weight of composite concrete rust-resistant preservative and 152 parts by weight of mixing water, wherein the thickness of a concrete protective layer at the lower edge of a bottom plate and the upper edge of a top plate is 40mm, and the rest steps are the same as those of the embodiment. Sampling the drill core of the test area according toThe compressive strength, the split tensile strength and the static compression elastic modulus of the concrete protective layer are detected according to GB/T50081-2002 standard of a common concrete mechanical property test method, wherein the compressive strength is shown in a table 3, and the split tensile strength and the static compression elastic modulus are shown in a table 4; detecting chloride ion permeability of the concrete protective layer by adopting an electric flux rapid determination method according to the temporary technical condition of high-performance concrete of the passenger special line 050910 and the standard of ASTM C1202, wherein the standard of the chloride ion permeability determination of the ASTM C1202 is shown in the following table 5; the results of the electric flux of the concrete protective layer are shown in table 6 below.
Table 3 compressive Strength (MPa)
TABLE 4 split tensile Strength, elastic modulus under static pressure (MPa)
Table 5ASTM C1202 chloride ion permeability criterion
TABLE 6 electric flux (C)
| Project | Pile foundation | Crash barrier | Pier column | Bearing platform | Capping beam | Bottom plate lower edge | Top edge of top plate |
| Test example 1 | 858 | 907 | 882 | 861 | 878 | 559 | 555 |
| Test example 2 | 927 | 952 | 938 | 929 | 935 | 615 | 614 |
| Test example 3 | 1037 | 1159 | 1029 | 1019 | 1038 | 981 | 997 |
As can be seen from the test results in table 3, table 4 and table 6, the proportion of the concrete admixture is changed in test example 2 based on test example 1, the slag micropowder in the raw materials of the pile foundation and the protective guard bar concrete protective layer is replaced by the first-grade fly ash with equal mass, the first-grade fly ash in the raw materials of the pier stud, the bearing platform and the cover beam concrete protective layer is replaced by the slag micropowder with equal mass, the silica fume in the raw materials of the upper edge top plate and the lower edge bottom plate concrete protective layer is replaced by the slag micropowder with equal mass, the compressive strength, the splitting tensile strength and the electrostatic compression elastic modulus of the corresponding parts are lower than those in test example 1, and the electric flux of the corresponding parts is higher than that in test example 1; test example 3 the proportion of concrete admixture was changed on the basis of test example 1, the composite concrete rust-inhibiting preservative in the pile foundation and the raw material of the protective layer of the crash bar concrete was replaced with the polycarboxylic acid high-efficiency water reducer of equal mass, the polycarboxylic acid high-efficiency water reducer in the raw material of the protective layer of the pier column, the bearing platform and the capping beam concrete was replaced with the composite concrete rust-inhibiting preservative of equal mass, the organosilicon waterproofing agent in the raw material of the protective layer of the concrete protective layer of the upper edge top plate and the lower edge bottom plate was replaced with the composite concrete rust-inhibiting preservative of equal mass, the compressive strength, the split tensile strength and the electrostatic compression elastic modulus of the corresponding parts were all lower than those of test example 1, and the electric flux of the corresponding parts was higher than that of test example 1.
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (10)
1. The complete set of anti-corrosion construction method for the marine environment bridge member is characterized by comprising the following steps of:
(1) And (3) water spraying cleaning: spraying water by a high-pressure water gun to clean the surface of the bridge member concrete;
(2) Defect repair: judging the defective concrete according to visual inspection, cutting, removing and repairing air holes, cracks and dislocation on the surface;
(3) Applying a concrete protective layer: applying concrete protection layers with different raw material ratios and different thicknesses to different parts of the repaired bridge member;
(4) And (3) brushing an organosilicon concrete protective agent: and (3) sequentially brushing a silane paste permeable primer, a silicone color difference regulator and a silicone breathable finish on the surface of the concrete protective layer, and curing for 3-4d to finish the anti-corrosion construction.
2. The complete set of anti-corrosion construction methods for marine environmental bridge members according to claim 1, wherein the concrete age of the bridge members in the step (1) is not less than 28d.
3. The complete set of anti-corrosion construction methods for marine environmental bridge members according to claim 1, wherein the repair age before the concrete protective layer is applied in the step (3) is not less than 7d.
4. The complete set of anti-corrosion construction methods for marine environmental bridge members according to claim 1, wherein the age of the concrete protective layer coated with the silane paste permeable primer in the step (4) is not less than 28d.
5. The complete set of anti-corrosion construction method for the marine environmental bridge member according to claim 1, wherein the intervals among the silane paste permeable primer, the silicone color difference regulator and the silicone breathable finish paint coated in the step (4) are 24-36h.
6. The complete set of anti-corrosion construction methods for marine environmental bridge members according to claim 1, wherein the defect repair criteria in step (2) are: the pile foundation concrete is provided with cracks with the width being more than or equal to 0.1mm, the pier column and the bearing platform concrete are provided with cracks with the width being more than or equal to 0.15mm, and the capping beam, the lower edge of the bottom plate, the upper edge of the top plate and the anti-collision guardrail are all required to be repaired when the cracks with the width being more than or equal to 0.2mm are formed.
7. The complete set of anti-corrosion construction method for the marine environment bridge member according to claim 1, wherein the raw materials of the concrete protective layer in the step (3) comprise 205-270 parts by weight of Portland cement, 620-735 parts by weight of fine aggregate, 1125-1155 parts by weight of coarse aggregate, 93-122 parts by weight of primary fly ash, 75-100 parts by weight of slag micropowder, 80-120 parts by weight of silica fume, 4-7 parts by weight of polycarboxylic acid high-efficiency water reducer, 5.5-13 parts by weight of composite concrete rust-resistant preservative, 3-6 parts by weight of organosilicon waterproofing agent and 150-160 parts by weight of mixing water.
8. The complete set of anti-corrosion construction methods for marine environmental bridge members according to claim 7, wherein the concrete protection layer applying method in the step (3) is as follows: the raw materials of the concrete protection layer of the pile foundation and the collision guard comprise 205-212 parts by weight of Portland cement, 728-735 parts by weight of fine aggregate, 1140-1148 parts by weight of coarse aggregate, 93-98 parts by weight of primary fly ash, 75-78 parts by weight of slag micropowder, 80-90 parts by weight of silica fume, 4.7-5.5 parts by weight of polycarboxylic acid high-efficiency water reducer, 5.5-6.8 parts by weight of composite concrete rust-resistant preservative, 5-6 parts by weight of organosilicon waterproofing agent and 153-156 parts by weight of mixing water, wherein the thickness of the concrete protection layer of the pile foundation is 70-75mm, and the thickness of the concrete protection layer of the collision guard is 35-40mm; the raw materials of the concrete protective layers of the pier column, the bearing platform and the capping beam comprise 215-235 parts by weight of Portland cement, 680-725 parts by weight of fine aggregate, 1125-1135 parts by weight of coarse aggregate, 98-105 parts by weight of primary fly ash, 79-85 parts by weight of slag micropowder, 91-105 parts by weight of silica fume, 4-4.5 parts by weight of polycarboxylic acid high-efficiency water reducer, 7-9 parts by weight of composite concrete rust-resistant preservative, 4-5 parts by weight of organosilicon waterproofing agent and 152-158 parts by weight of mixing water, the thickness of the concrete protective layers of the pier column and the capping beam is 45-50mm, and the thickness of the concrete protective layer of the bearing platform is 65-70mm; the raw materials of the concrete protective layer at the lower edge of the bottom plate and the upper edge of the top plate comprise 250-270 parts by weight of Portland cement, 620-660 parts by weight of fine aggregate, 1145-1155 parts by weight of coarse aggregate, 115-122 parts by weight of primary fly ash, 90-100 parts by weight of slag micropowder, 110-120 parts by weight of silica fume, 6-7 parts by weight of polycarboxylic acid high-efficiency water reducer, 10-13 parts by weight of composite concrete rust-resistant preservative, 3-4 parts by weight of organosilicon waterproofing agent and 150-153 parts by weight of mixing water, and the thickness of the concrete protective layer at the lower edge of the bottom plate and the upper edge of the top plate is 35-40mm.
9. The complete set of anti-corrosion construction methods for marine environmental bridge members according to claim 7, wherein the portland cement is one of portland cement II or portland cement; the fine aggregate has apparent density of 2600-2700kg/m 3 Is characterized in that the river sand contains chloride ions<0.02 percent, the mud content is less than or equal to 2 percent, and the mud block content is less than or equal to 0.5 percent; the coarse aggregate is crushed stone with the particle size of 5-20mm, and the chloride ion content in the crushed stone<0.02 percent, the mud content is less than or equal to 0.5 percent, the mud block content is less than or equal to 0.25 percent, and the needle-shaped particle content is less than or equal to 7 percent.
10. The complete set of anti-corrosion construction method for marine bridge members according to claim 1, wherein the main component of the silane paste permeation primer in the step (4) is at least one of isobutyl triethoxysilane, n-octyl triethoxysilane and isooctyl triethoxysilane, and the coating amount of the silane paste permeation primer is 150-250g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The main components of the silicone breathable finish paint are MQ silicone resin and methyl silicone oil, and the coating amount of the silicone breathable finish paint is 300-400g/m 2 。
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