CN103359986B - A kind of concrete prefabricated element using sea sand - Google Patents
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- CN103359986B CN103359986B CN201210089221.1A CN201210089221A CN103359986B CN 103359986 B CN103359986 B CN 103359986B CN 201210089221 A CN201210089221 A CN 201210089221A CN 103359986 B CN103359986 B CN 103359986B
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Abstract
A kind of concrete prefabricated element using sea sand, it uses following raw material to prepare: cement, water, sea sand；Surface is shaped with the reinforcing bar of 1-3 layer protective coating, and the following index of coating has particular/special requirement: coated reinforcement leak source, coated reinforcement breakage rate, coating layer thickness, resistance to chemical attack, wet adhesion, adhesive strength, coating bending requirement, wearability, Relative binding strengths, chloride permeability etc..Present invention can ensure that the concrete prefabricated element ratio in service life using sea sand uses sea sand and uses the concrete component that antirust agent or sea sand desalting treatment measures obtain to exceed more than one times.Due to the fact that use sea sand substitutes fluvial sand, thus with low cost, there is comparatively huge economic worth and social value.
Description
Technical field
The present invention relates to the design of steel bar anti-corrosion erosion resisting coating and applied technical field, specifically provide a kind of concrete prefabricated element using sea sand.
Background technology
In prior art, because will with respect to the service life of the corrosion-resistant of reinforcing bar He integrated member, the sand used in concrete prefabricated element mostly be fluvial sand.Prior art also has some research datas using sea sand, but comprehensive, generally by the processing method that following several classes are concrete: 1) desalted sea sand, remove the salt and alkali component in sea sand, in order to substantially reduce its corrosivity.2) using corrosion inhibitor for reinforcing bar, have related description, but it is extremely limited to be because technique effect in YB/T9231-98, operability is not strong, eliminates the related description using sea sand in YB/T9231-2009.3) erosion shield is used.
Prior art data is early related to the correlational study of marine sand concrete, but does not propose well a whole set of feasible technical scheme.It is intended that obtain the technical method using sea sand to substitute fluvial sand making concrete component that a kind of technique effect is excellent, and highly desirable acquisition has the concrete technical scheme of very strong operability.
Summary of the invention
It is an object of the present invention to provide the concrete prefabricated element using sea sand that a kind of technique effect is excellent.
The invention provides a kind of concrete prefabricated element using sea sand, it is characterized in that: described concrete prefabricated element uses following raw material to prepare: cement, water, sea sand, surface configuration have the reinforcing bar of 1-3 layer protective coating, wherein, cement, water, this three of sea sand consumption be referred to prior art select；The coating of rebar surface meets following requirement:
Rebar surface in described concrete prefabricated element is provided with 1-3 layer protective coating, and coating meets following requirement:
The coating leak source of rebar surface requires: < 0.5/meter (in each meter of length section 0.5)；
The coating damage rate of rebar surface: < 0.5% (meeting JG3042 standard-required)；
Coating layer thickness: 200-400 μm；
Resistance to chemical attack ability: at distilled water, 3MCaCl2, 3MNaOH, saturated Ca (OH)2, 45 days, under 55 DEG C of conditions, by JG3042 standard Eligibility requirements；
Wet adhesion: 90 DEG C, soaks 45 days in 3.5%NaCl solution, meets the 1-2 level requirement of standard CAN Z245.20-06；
Adhesive strength: under room temperature, >=50MPa (meets standard GB/T6329 to require)；
Coating bending requires: Φ 20mm reinforcing bar, bends to the circle that diameter is 6d, axle diameter 120mm, 23 DEG C, has no crack and peel off；(meeting JG3042 standard-required)
Wearability: with the emery wheel of CS-10,1kg load, revolution is 1000 turns per minute；< 30mg；(meeting JG3042 standard-required)
Relative binding strengths: in concrete, the bar reinforcement pull strength of coating is more than the 85% of former exposed reinforcement；(meeting JG3042 standard-required)
Chloride permeability: at 45 days, 3MNaCl solution, under 24 DEG C of conditions, chloride permeability amount < 5 × 10-5mol/L；(meeting JG3042 standard-required).
The concrete prefabricated element of use sea sand of the present invention, is also claimed following preferred content: the coating in concrete component also meets following requirement:
Rate of body weight gain: at distilled water, 60 DEG C, under 15 days conditions, rate of body weight gain is≤3%；
Outward appearance: range estimation uniform color, bubble-free, flawless；
Section porosity: meet 1 grade standard of SY/T0315；
Cathodic disbonding: at 23 ± 2 DEG C, 168h, 3.5%NaCl, the test result≤3mm under-1.5V condition, according to SY/T0315 standard；
Electrical strength: require as >=35MV/m according to the test result of GB/T1408.1 standard；
Specific insulation: >=1 × 1013Ω.m；(meeting GB/T1410 standard-required)
Rate of body weight gain: 3.5%NaCl, 60 DEG C, when 15d ,≤2%；(meeting GB/T1034 standard-required)
Salt spray test: 5%NaCl, 35 DEG C, 800h, disbondment radius < 1mm (establishing criteria JG3042)；
2 layers of protective coating that rebar surface is shaped with；The hybrid epoxidized equivalent value of epoxy resin that wherein internal layer coating uses is 840-1400；The hybrid epoxidized equivalent value of epoxy resin that outer coating uses is 100-1800；And the hybrid epoxidized equivalent value of epoxy resin that internal layer coating uses is lower than the hybrid epoxidized equivalent value of the epoxy resin that outer coating uses.
Various raw materials and weight percent content thereof that the protective coating of described rebar surface uses meet following requirement: phenol aldehyde modified firming agent 20-30%, toughener and filler sum 6-10%, accelerator, levelling agent and coupling agent three's sum are 2-3%, and epoxy resin is surplus；Wherein: phenol aldehyde modified firming agent is specially the product of grand celebration Qing Lu Fine Chemical Co., Ltd, and model is 989；Toughener and filler are following several one or a combination set of: nitrile rubber, titanium dioxide, barium sulfate, wollastonite, white carbon black；Coupling agent is Benzoinum；
Rebar surface system haves three layers while protective coating；Polyurethane antiaging coatings also it is shaped with in the outside of outer layer.
In the various raw materials that the protective coating of described rebar surface uses:
Phenol aldehyde modified firming agent is specially the product of grand celebration Qing Lu Fine Chemical Co., Ltd, and model is 989；
Accelerator: be specially the mixture of methylimidazole and following substances: the product of the South Sea, Fenghua Chemical Co., Ltd., model is W-1；The relative mass ratio of methylimidazole and W-1 range for (1: 4)-(2: 1)；
Levelling agent: be specially the product of the South Sea, Fenghua Chemical Co., Ltd., model is 788；
Coupling agent is Benzoinum；
Epoxy resin is specially the GESR904H (epoxide equivalent is 840-900) and GESR907 (epoxide equivalent is 1500-1800) alternative one or its mixture that Taiwan Plastic Group produces.
In the protective coating preparation process of rebar surface after coating is prepared in thermal spraying and carry out following heat cure process before water-cooled: temperature requirement is 150-250 DEG C, and the time is 0.5-3 minute；
After cooling, temperature requirement is≤90 DEG C.
The raw material that described concrete prefabricated element can also use also has stone.That is described concrete prefabricated element uses cement, water, sea sand, stone, these five kinds of mixed materials of reinforcing bar with 1-3 layer protective coating to prepare.
Present invention can ensure that the concrete prefabricated element ratio in service life using sea sand uses sea sand and uses the concrete component that antirust agent or sea sand desalting treatment measures obtain to exceed more than one times.Due to the fact that use sea sand substitutes fluvial sand, thus with low cost, and abundant sea sand resources can be made full use of, there is comparatively huge economic worth and social value.
Detailed description of the invention
8 following embodiments, specifically including 2 kinds of coating process (representing below) and 4 kinds of paint formulation (representing with A1, A2, A3, A4 below) with B1, B2, these embodiments all show: be attained by required concrete reinforcement performance requirement according to the high-performance epoxy-coated reinforcement that the requirement of the present invention is made.
Table 1 formulation for coating material table (is expressed according to relative mass number)
The condition requirement of the different coating process of table 2
Numbering heating condition (heating in medium frequency) solidification temperature rate of cooling
B1240℃200℃
B2230℃210℃
The different coated reinforcement performance acquired by embodiment of table 3
The high-performance that the above embodiments 1-8 obtains is crossed the antirust performance of coated reinforcement and is significantly larger than in this technical standard of YB/T9231-2009 the requirement of anticorrosion performance.Such as: YB/T9231-2009 showing, corrosion electric current when corrosion and destruction starts is < 0.2 μ A/cm2, and in embodiments of the invention 1-8, corrosion current can be reduced to 10 μ A/m2, its rust-resisting property improves two orders of magnitude.
Comparative example has 2: protective coating formulation for coating material is understood with reference to prior art.Coating process is heating-up temperature 230 DEG C, if the curing process rate of cooling after using is without being distinctly claimed, and acquired performance such as table 4.
The performance of the different coated reinforcement acquired by comparative example of table 4
| Numbering | Wet adhesion 90 DEG C, 45 days | Bending: Φ 20mm reinforcing bar, bending diameter 6d, 23 DEG C |
| Comparative example 1 | 5 grades | Free from flaw |
| Comparative example 2 | 5 grades | Free from flaw |
Regular reinforcement in above-mentioned comparative example 1,2 does not reach corrosion resistant requirement.
Embodiment 9
A kind of concrete prefabricated element using sea sand, it uses following raw material to prepare: cement, water, sea sand, stone, surface are shaped with the reinforcing bar of 1-3 layer protective coating, and the coating of rebar surface meets following requirement:
Coated reinforcement leak source: < 0.5/meter；
Coated reinforcement breakage rate: < 0.5% (meeting JG3042 standard-required)；
Coating layer thickness: 200-400 μm；
Resistance to chemical attack Capability Requirement: index request is: distilled water, 3M, CaCl2, 3MNaOH, saturated Ca (OH)2, 45d, under 55 DEG C of conditions, by JG3042 standard Eligibility requirements；
Wet adhesion: 90 DEG C, 3.5%NaCl, > 45d, meet the 1-2 level requirement of standard CAN Z245.20-06；
Adhesive strength: under room temperature, >=50MPa (meets standard GB/T6329 to require)；
Coating bending requires: Φ 20mm reinforcing bar, and after bending, diameter is 6d, axle diameter 120mm, 23 DEG C, has no crack and peels off；(meeting JG3042 standard-required)
Wearability: index is CS-10,1kg, 1000 turn；< 12mg；(meeting JG3042 standard-required)
Relative binding strengths: reinforcement in concrete rod drawing, reaches former exposed reinforcement > 85%；(meeting JG3042 standard-required)
Chloride permeability: under 45d, 3M, NaCl, 24 DEG C of condition, < 5 × 10-5mol/L；(meeting JG3042 standard-required)；
Rate of body weight gain: 3.5NaCl, 60 DEG C, when 15d, rate of body weight gain is 1.24%；
Outward appearance: range estimation uniform color, bubble-free, flawless；
Section porosity: meet 1 grade standard of SY/T0315；
Cathodic disbonding: at 23 ± 2 DEG C, 168h, 3.5%NaCl, under-1.5V condition, is 2.5mm according to the test result of SY/T0315 standard；
Electrical strength: require as >=35MV/m according to the test result of GB/T1408.1 standard；
Specific insulation: >=3.1 Ω .m；(meeting GB/T1410 standard-required)
Salt spray test: 5%NaCl, 35 DEG C, 800h, disbondment radius < 0.8mm (establishing criteria JG3042)；
2 layers of protective coating that rebar surface is shaped with；The hybrid epoxidized equivalent value of epoxy resin that wherein internal layer coating uses is 840-1400；The hybrid epoxidized equivalent value of epoxy resin that outer coating uses is 100-1800；And the hybrid epoxidized equivalent value of epoxy resin that internal layer coating uses is lower than the hybrid epoxidized equivalent value of the epoxy resin that outer coating uses.
Various raw materials and weight percent content thereof that the protective coating of described rebar surface uses meet following requirement: phenol aldehyde modified firming agent 20-30%, toughener and filler sum 6-10%, accelerator, levelling agent and coupling agent three's sum are 2-3%, and epoxy resin is surplus；Wherein:
In the various raw materials that the protective coating of described rebar surface uses:
Phenol aldehyde modified firming agent is specially the product of grand celebration Qing Lu Fine Chemical Co., Ltd, and model is 989；
Toughener and filler are following several one or a combination set of: nitrile rubber, titanium dioxide, barium sulfate, wollastonite, white carbon black；
Accelerator: be specially the mixture of methylimidazole and following substances: the product of the South Sea, Fenghua Chemical Co., Ltd., model is W-1；The relative mass ratio of methylimidazole and W-1 range for 1: 2；
Levelling agent: be specially the product of the South Sea, Fenghua Chemical Co., Ltd., model is 788；
Coupling agent is Benzoinum；
Epoxy resin is specially the GESR904H (epoxide equivalent is 840-900) and GESR907 (epoxide equivalent is 1500-1800) alternative one or its mixture that Taiwan Plastic Group produces.
In the protective coating preparation process of rebar surface after coating is prepared in thermal spraying and carry out following heat cure process before water-cooled: temperature requirement is 150-250 DEG C, and the time is 0.5-3 minute；
After cooling, temperature requirement is≤90 DEG C.
Embodiment 10
A kind of concrete prefabricated element using sea sand, it uses following raw material to prepare: cement, water, sea sand；
Rebar surface in concrete prefabricated element is provided with 1 layer of protective coating, and coating meets following requirement:
Coated reinforcement leak source: < 0.5/meter；
Coated reinforcement breakage rate: < 0.5% (meeting JG3042 standard-required)；
Coating layer thickness: 200-400 μm；
Resistance to chemical attack Capability Requirement: index request is: distilled water, 3M, CaCl2, 3MNaOH, saturated Ca (OH)2, 45d, under 55 DEG C of conditions, by JG3042 standard Eligibility requirements；
Wet adhesion: 90 DEG C, 3.5%NaCl, > 45d, meet the 1-2 level requirement of standard CAN Z245.20-06；
Adhesive strength: under room temperature, >=65MPa (meets standard GB/T6329 to require)；
Coating bending requires: Φ 20mm reinforcing bar, and after bending, diameter is 6d, axle diameter 120mm, 23 DEG C, has no crack and peels off；(meeting JG3042 standard-required)
Wearability: index is CS-10,1kg, 1000 turn；< 12mg；(meeting JG3042 standard-required)
Relative binding strengths: reinforcement in concrete rod drawing, reaches former exposed reinforcement > 85%；(meeting JG3042 standard-required)
Chloride permeability: under 45d, 3M, NaCl, 24 DEG C of condition, < 5 × 10-5mol/L；(meeting JG3042 standard-required).
Rate of body weight gain: at distilled water, 60 DEG C, when 15d, rate of body weight gain is 1.24%；
Outward appearance: range estimation uniform color, bubble-free, flawless；
Section porosity: meet 1 grade standard of SY/T0315；
Cathodic disbonding: at 23 ± 2 DEG C, 168h, 3.5%NaCl, under-1.5V condition, is 2.5mm according to the test result of SY/T0315 standard；
Electrical strength: require as >=39MV/m according to the test result of GB/T1408.1 standard；
Specific insulation: >=3.1 Ω .m；(meeting GB/T1410 standard-required)
Rate of body weight gain: 3.5%NaCl, 60 DEG C, when 15d ,≤1.24%；(meeting GB/T1034 standard-required)
Salt spray test: 5%NaCl, 35 DEG C, 800h, disbondment radius < 0.8mm (establishing criteria JG3042)；
1 layer of protective coating that rebar surface is shaped with；The hybrid epoxidized equivalent value of epoxy resin that coating uses is 840-1800；Polyurethane antiaging coatings also it is shaped with in the outside of outer layer.
Various raw materials and weight percent content thereof that the protective coating of described rebar surface uses meet following requirement: phenol aldehyde modified firming agent 20-30%, toughener and filler sum 6-10%, accelerator, levelling agent and coupling agent three's sum are 2-3%, and epoxy resin is surplus；Wherein:
In the various raw materials that the protective coating of described rebar surface uses:
Phenol aldehyde modified firming agent is specially the product of grand celebration Qing Lu Fine Chemical Co., Ltd, and model is 9897；
Toughener and filler are following several one or a combination set of: nitrile rubber, titanium dioxide, barium sulfate, wollastonite, white carbon black；
Accelerator: be specially the mixture of methylimidazole and following substances: the product of the South Sea, Fenghua Chemical Co., Ltd., model is W-1；The relative mass ratio of methylimidazole and W-1 range for 1: 4；
Levelling agent: be specially the product of the South Sea, Fenghua Chemical Co., Ltd., model is 788；
Coupling agent is Benzoinum；
Epoxy resin is specially the GESR904H (epoxide equivalent is 840-900) and GESR907 (epoxide equivalent is 1500-1800) alternative one or its mixture that Taiwan Plastic Group produces.
In the protective coating preparation process of rebar surface after coating is prepared in thermal spraying and carry out following heat cure process before water-cooled: temperature requirement is 150-250 DEG C, and the time is 0.5-3 minute；
After cooling, temperature requirement is≤90 DEG C.
Embodiment 11
A kind of concrete prefabricated element using sea sand, it uses following raw material to prepare: cement, water, sea sand, stone；
Rebar surface in concrete prefabricated element arranges the protective coating that haves three layers, and coating meets following requirement:
Coated reinforcement leak source: < 0.5/meter；
Coated reinforcement breakage rate: < 0.5% (meeting JG3042 standard-required)；
Coating layer thickness: 200-400 μm；
Resistance to chemical attack Capability Requirement: index request is: distilled water, 3M, CaCl2, 3MNaOH, saturated Ca (OH)2, 45d, under 55 DEG C of conditions, by JG3042 standard Eligibility requirements；
Wet adhesion: 90 DEG C, 3.5%NaCl, > 45d, meet the 1-2 level requirement of standard CAN Z245.20-06；
Adhesive strength: under room temperature, >=65MPa (meets standard GB/T6329 to require)；
Coating bending requires: Φ 20mm reinforcing bar, and after bending, diameter is 6d, axle diameter 120mm, 23 DEG C, has no crack and peels off；(meeting JG3042 standard-required)
Wearability: index is CS-10,1kg, 1000 turn；< 12mg；(meeting JG3042 standard-required)
Relative binding strengths: reinforcement in concrete rod drawing, reaches former exposed reinforcement > 85%；(meeting JG3042 standard-required)
Chloride permeability: under 45d, 3M, NaCl, 24 DEG C of condition, < 5 × 10-5mol/L；(meeting JG3042 standard-required).
Rate of body weight gain: 3.5%NaCl, 60 DEG C, when 15d, rate of body weight gain is 1.24%；
Outward appearance: range estimation uniform color, bubble-free, flawless；
Section porosity: meet 1 grade standard of SY/T0315；
Cathodic disbonding: at 23 ± 2 DEG C, 168h, 3.5%NaCl, under-1.5V condition, is 2.5mm according to the test result of SY/T0315 standard；
Electrical strength: require as >=35MV/m according to the test result of GB/T1408.1 standard；
Specific insulation: >=3.1 Ω .m；(meeting GB/T1410 standard-required)
Salt spray test: 5%NaCl, 35 DEG C, 800h, disbondment radius < 0.8mm (establishing criteria JG3042)；
1 layer of protective coating that rebar surface is shaped with；The hybrid epoxidized equivalent value of epoxy resin that coating uses is 840-1800；Polyurethane antiaging coatings also it is shaped with in the outside of outer layer.
Various raw materials and weight percent content thereof that the protective coating of described rebar surface uses meet following requirement: phenol aldehyde modified firming agent 25%, toughener and filler sum 9.2%, accelerator, levelling agent and coupling agent three's sum are 2.4%, and epoxy resin is surplus；Wherein:
In the various raw materials that the protective coating of described rebar surface uses:
Phenol aldehyde modified firming agent is specially the product of grand celebration Qing Lu Fine Chemical Co., Ltd, and model is 989；
Toughener and filler are following several one or a combination set of: nitrile rubber, titanium dioxide, barium sulfate, wollastonite, white carbon black；
Accelerator: be specially the mixture of methylimidazole and following substances: the product of the South Sea, Fenghua Chemical Co., Ltd., model is W-1；The relative mass ratio of methylimidazole and W-1 range for 1: 4；
Levelling agent: be specially the product of the South Sea, Fenghua Chemical Co., Ltd., model is 788；
Coupling agent is Benzoinum；
Epoxy resin is specially the GESR904H (epoxide equivalent is 840-900) and GESR907 (epoxide equivalent is 1500-1800) alternative one or its mixture that Taiwan Plastic Group produces.
In the protective coating preparation process of rebar surface after coating is prepared in thermal spraying and carry out following heat cure process before water-cooled: temperature requirement is 150-250 DEG C, and the time is 0.5-3 minute；
After cooling, temperature requirement is≤90 DEG C.
Embodiment 12
Make common naked reinforcing bar with sea sand and high-performance epoxy-coated reinforcement makes concrete prefabricated element, carry out corrosion resistance contrast.Concrete prefabricated element manufacturing conditions is as shown in table 5.
Table 5
The common naked reinforcing bar of corrosion current measuring reinforcing bar with steel bar corrosion measuring instrument is > 1 μ A/cm2, belonging to two-forty corrosion, high-performance epoxy-coated reinforcement is 0.11 μ A/cm2,There is no corrosion.This fully shows that high-performance epoxy-coated reinforcement has prominent antiseptic property.
Claims (5)
1. the concrete prefabricated element using sea sand, it is characterised in that: described concrete prefabricated element uses following raw material to prepare: cement, water, sea sand, surface configuration have the reinforcing bar of 2 layers of protective coating, and the coating of rebar surface meets following requirement:
The coating leak source of rebar surface requires: < 0.5/meter；
The coating damage rate of rebar surface: < 0.5%；
Coating layer thickness: 200-400 μm；
Resistance to chemical attack ability: at distilled water, 3MCaCl2, 3MNaOH, saturated Ca (OH)2, 45 days, under 55 DEG C of conditions, by JG3042 standard Eligibility requirements；
Wet adhesion: 90 DEG C, soaks 45 days in 3.5%NaCl solution, meets the 1-2 level requirement of standard CAN Z245.20-06；
Adhesive strength: under room temperature, >=50MPa；
Coating bending requires: Φ 20mm reinforcing bar, bends to the circle that diameter is 6d, axle diameter 120mm, 23 DEG C, has no crack and peel off；
Wearability: with the emery wheel of CS-10,1kg load, revolution is 1000 turns per minute；< 30mg；
Relative binding strengths: in concrete, the bar reinforcement pull strength of coating is more than the 85% of former exposed reinforcement；
Chloride permeability: at 45 days, 3MNaCl solution, under 24 DEG C of conditions, chloride permeability amount < 5 × 10-5mol/L；
Coating in concrete component also meets following requirement:
Rate of body weight gain: at distilled water, 60 DEG C, under 15 days conditions, rate of body weight gain is≤3%；
Section porosity: meet 1 grade standard of SY/T0315；
Cathodic disbonding: at 23 ± 2 DEG C, 168h, 3.5%NaCl, the test result≤3mm under-1.5V condition, according to SY/T0315 standard；
Electrical strength: require as >=35MV/m according to the test result of GB/T1408.1 standard；
Specific insulation: >=1 × 1013Ω.m；
Rate of body weight gain: 3.5%NaCl, 60 DEG C, when 15d ,≤2%；
Salt spray test: 5%NaCl, 35 DEG C, 800h, disbondment radius < 1mm；
2 layers of protective coating that rebar surface is shaped with；The hybrid epoxidized equivalent value of epoxy resin that wherein internal layer coating uses is 840-1400；The hybrid epoxidized equivalent value of epoxy resin that outer coating uses is 100-1800；And the hybrid epoxidized equivalent value of epoxy resin that internal layer coating uses is lower than the hybrid epoxidized equivalent value of the epoxy resin that outer coating uses.
2. described in claim 1, use the concrete prefabricated element of sea sand, it is characterised in that:
Various raw materials and weight percent content thereof that the protective coating of described rebar surface uses meet following requirement: phenol aldehyde modified firming agent 20-30%, toughener and filler sum are 6-10%, accelerator, levelling agent and coupling agent three's sum are 2-3%, and epoxy resin is surplus；Wherein:
Toughener for and filler be following several one or a combination set of: nitrile rubber, titanium dioxide, barium sulfate, wollastonite, white carbon black；Coupling agent is Benzoinum；
Rebar surface system haves three layers while protective coating；Polyurethane antiaging coatings also it is shaped with in the outside of outer layer.
3. described in claim 2, use the concrete prefabricated element of sea sand, it is characterised in that:
In the various raw materials that the protective coating of described rebar surface uses:
Phenol aldehyde modified firming agent is specially the product of grand celebration Qing Lu Fine Chemical Co., Ltd, and model is 989；
Accelerator: be specially the mixture of methylimidazole and following substances: the product of the South Sea, Fenghua Chemical Co., Ltd., model is W-1；The relative mass ratio of methylimidazole and W-1 range for (1:4) (2:1)；
Levelling agent: be specially the product of the South Sea, Fenghua Chemical Co., Ltd., model is 788；
For Benzoinum；
Epoxy resin be specially following the two mixture or one of them: the GESR904H that Taiwan Plastic Group produces, its epoxide equivalent is 840-900；The GESR907 that Taiwan Plastic Group produces, its epoxide equivalent is 1500-1800.
4. described in claim 1, use the concrete prefabricated element of sea sand, it is characterised in that:
In the protective coating preparation process of rebar surface after coating is prepared in thermal spraying and carry out following heat cure process before water-cooled: temperature requirement is 150-250 DEG C, and the time is 0.5-3 minute；
After cooling, temperature requirement is≤90 DEG C.
5. according to the concrete prefabricated element of one of them described use sea sand of claim 1-4, it is characterised in that: the raw material that described concrete prefabricated element uses also has stone.
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