CN206721855U - A kind of seawater mixes curing concrete - Google Patents

Abstract

The utility model discloses a kind of seawater to mix curing concrete, belongs to reinforced concrete technology field.The seawater, which mixes curing concrete, includes concrete mix and coated reinforcement, and the concrete mix floating coat reinforcing bar is arranged in desired manner；The coated reinforcement includes Ribbed Bar and epoxy coating, and epoxy coating is coated on Ribbed Bar surface；The cross rib of Ribbed Bar and the altitude range of longitudinal rib are 0.6 3.2mm, and cross rib top width scope is 0.4 2.5mm, and longitudinal rib top width scope is 1.0 4.0mm.The epoxy coating is SEBF coatings.The concrete mix refers to the concrete with seawater mixing, and chloride total content is 0.2 0.5wt.% in concrete mix.The utility model is mixed bar construction anti-corrosion coating reinforcing bar is improved in curing concrete for seawater, and it is big to hold hoop power between coating and concrete, and effective corrosiveness for having protected seawater.

Description

A kind of seawater mixes curing concrete

Technical field

It the utility model is related to reinforced concrete technology field, and in particular to a kind of seawater mixes curing concrete, the concrete In employ and be adapted to the moist and anti-corrosion coating reinforcing bar containing chloride environment.

Background technology

Generally, concrete can provide a kind of alkaline environment of protectiveness for reinforcing bar, and now reinforcing bar will not occur Corrosion.As active time strengthens, concrete by be carbonized, the destructive process such as Chloride Attack, gradually lose the guarantor to reinforcing bar Shield acts on, and the corrosion of reinforcing bar slowly takes place.In in general atmospheric environment, above-mentioned corrosion process is very slow, armored concrete Service life up to 50~70 years.But because South China Sea Environment has temperature height, high humidity, wind-force is strong, concentration of saline fog is high Feature, these features can significantly speed up above-mentioned steel reinforced concrete erosion failure procedure.In such a case, common concrete Anti-corrosion means can not be effectively sealing off capillary in concrete, aperture and its minute crack, to corrosive mediums such as water, chlorions Infiltration is difficult to produce good blocking effect, causes reinforcement corrosion inside concrete structure serious.Reinforcing bar is once occurring to corrode The mechanical properties such as tensile strength, the modulus of elasticity of reinforced concrete structure can be caused to decline to a great extent, and reinforcing bar corrodes Product can cause concrete cracking, concrete is lost its structure function.

In addition, in the process of construction of off-lying sea, construction period can greatly be reduced by mixing curing concrete using seawater, be saved Time and financial cost.It is also a research direction gradually rising at present that seawater, which mixes curing concrete, the end of the year 2014, the Committee of Development and Reform, The Ministry of Finance, Ministry of Industry and Information combine a few days ago to print and distribute《Critical material upgrading engineering construction scheme》, wherein, scheme proposes to support the South Sea Islands and reefs construction mixes foster type concrete industry with seawater.At present, seawater mixes foster type concrete annual capacity and reaches 20 ten thousand steres simultaneously Demonstration Application is realized in Reef in Chinese South Sea construction.Seawater mix curing concrete be exactly using seawater by aggregate and gather materials carry out mix, But because, containing the salt that concentration is higher, the not only aquation to cement and hardening can all have an impact, more to reinforcing bar in seawater Corrosion protection propose great challenge.For the chlorine ion concentration in raw material, GB50165-1992《Concrete quality control Standard processed》The 2.3.4 articles regulation, " in humidity and containing the armored concrete in chloride environment, chlorine in concrete mix Compound total content must not exceed the 0.1% " of cement weight.According to calculating, the weight that seawater mixes chloride in curing concrete accounts for water The 1.2% of mud weight, it greatly exceed standard required value.In addition, seawater mix curing concrete correlative study it is just emerging Rise, it is necessary to investigate seawater mix curing concrete in the seawater long service when reinforcing bar corrosion condition, study truly feasible corrosion Means of defence.

As can be seen here, it is necessary to carry out durability technical research, reinforced concrete for reinforced concrete structure under South China Sea Environment The durability protection new method and engineering technology of soil can extend the maintenance period and service life of islands and reefs structure, reduce on island Reef interior economic input during one's term of military service.The durability method of reinforced concrete structure is studied, although having in the early stage is input, by In service life increase, stability enhancing, safeguard that reduction causes the overall integrated cost of reinforced concrete structure to decline.

Exploitation opposing perimeter country of the China to Reef in Chinese South Sea is later, lacks the construction experiences of islands and reefs infrastructure, for How safeguarding the durability of islands and reefs infrastructure should more be paid attention to, and the corrosion protection technology needed then needs to paddle one's own canoe and added To solve.Because etching problem has very strong region, and the reinforcing bar in South China Sea Environment is mixed according to conventional result of study Xtah Crude Clay structure is estimated and predicted, certainly will not be inconsistent with actual conditions, it is therefore necessary to has to material in South China Sea environment Targetedly study.

In general, the corrosion of armored concrete can be divided into the corrosion of concrete element ash and corrosion two parts of reinforcing bar.But It is that the corrosion rate of the latter is generally higher than the former, and its harmfulness is also bigger.Therefore, the corrosion of general discussion armored concrete Refer mainly to the corrosion of naked reinforcing bar in armored concrete.In addition, South Sea atmospheric environment is big temperature the characteristics of being different from general environment Spend height, high humidity, ultraviolet foot, wind-force by force, in air containing the larger salt fog of concentration, be ocean temperature the characteristics of South China Sea Height, flow velocity are larger.These features mainly can speed up the corrosion rate of reinforced concrete.

Under normal circumstances, concrete pore solution has high alkalinity, and reinforcing bar is in passive state in this alkaline environment, because This will not corrode.If because the reasons such as concrete carbonization destroy this alkaline environment, rebar surface is just from stabilization Passive state is changed into unstable activated state, and corrosion is occurred.However, in the case where chlorion invasion occurs, even if coagulation The alkaline environment of soil does not destroy, and reinforcement corrosion still may occur.

For in certain armored concrete system, only chlorine ion concentration reaches certain value, and water, oxygen etc. be present must When wanting condition, corrosion can just occur.South China Sea temperature is high, flow velocity is big, and these factors will certainly accelerate chlorion in concrete In diffusion process, accelerate reinforcement corrosion.

Etching problem for chlorion to armored concrete, researcher set out from different perspectives, develop a variety of anti- Rotten method.For example, increase the compactness of concrete or hindered in concrete surface application water-repellent paint with increasing the diffusion of chlorion Power；Reinforcing steel bar corrosion inhibitor and corrosion inhibiter are added into concrete to reduce the effect of chlorion, changes reinforcement corrosion anode reaction and moves Mechanics；State can not also be corroded using electrochemical protection to ensure that reinforcing bar is in passivation.

Carrying out anti-corrosion to reinforcing bar using coating has had longer applicating history, using the buffer action of coating, makes reinforcing bar Do not contacted directly with Korrosionsmedium, play a part of protection.Protection of the coating to reinforcing bar is mainly realized by buffer action, is applied The presence of layer adds the resistance that corrosive medium reaches rebar surface.Reinforcing bar is directly exposed to if mechanical damage occurs for coating In concrete containing chlorion, or coating occurs aging with the time and causes anti-permeability performance to decline, and both of these case all can Coating is caused to lose buffer action, reinforcing bar is possible to corrode in this case.

In addition, although what change is the mechanical property of coated reinforcement in itself do not have compared with naked reinforcing bar, but reinforcing bar applies Surface is smoother after covering epoxy coating, and the frictional resistance between concrete is reduced, and their gripping force is slightly reduced.One As by select the less reinforcing bar of diameter, suitably increase thickness of concrete cover, configuration stirrup and proper extension anchoring and The measures such as colligation length solve.South China Sea Environment islands and reefs can pour many large-scale reinforced concrete structures when building, such as turn round king The weight of block, I-shaped block etc. is up to tens of tons, if bar diameter used is larger, correspondingly, the epoxy coating that can be used is thick Angle value may increased.In addition, for seawater mixes curing concrete, it is unknown whether above-mentioned standard is applicable.

The research that corrosion occurs on reinforcing bar shows, in general chlorine ion concentration, reinforcing bar-cement circle Hole at face is the necessary condition that corrosion occurs.Those steel can be made by mixing the chlorion contained in curing concrete due to seawater The concrete that gap among muscle and concrete be present corrodes at once after pouring.Under the same terms, with tap water by coagulation Soil is compared, and it is deeper that seawater mixes reinforcement corrosion depth in curing concrete.Concrete accelerated corrosion tests show, contain chlorine ion concentration When within permissible value, its performance with it is similar without chlorion；During using seawater, chlorine ion concentration 0.3%, corrosion is obvious to be added Speed.

Reinforced Concrete Materials is to build the great structural material of off-lying sea islands and reefs dosage.Islands and reefs are far apart from continent, traffic The resource that inconvenience, rubble and fresh water etc. prepare steel and concrete structure lacks very much.Current way is in big land precast concrete knot Structure, then transported using ship, construction cost is very high.In addition, Reef in Chinese South Sea is more in off-lying sea area, professional and technical personnel Not as land conveniently, maintenance cost is also more much higher than land for maintenance to armored concrete.Therefore, research is applied to islands and reefs Construction armored concrete guard technology, and then carry out seawater and mix the feasibility that curing concrete is applied on islands and reefs, turn into current Technical problem urgently to be resolved hurrily.

Epoxy-coated reinforcement aseptic technic passes through the fast development of more than 40 years, and the application techniques of coated reinforcement ten has been divided into It is ripe, gradually it is widely used in recent years at home.Epoxy Resin Coated Steel Bars are a kind of in the making of the surface of regular reinforcement The reinforcing bar of one layer of epoxy resin thin film protective layer, the external numerous studies of coating and engineer applied for many years show, using this The reinforcing bar that kind reinforcing bar can effectively prevent from being under adverse circumstances is corroded.So as to greatly improve the durability of engineering structure.Apply Layer is typically made using epoxy powder electrostatic coating method：It will be heated to after the processing such as regular reinforcement surface derusting, feather plucking More than 230 degrees Celsius of high temperature, then powered epoxy powder is ejected into rebar surface, because powder particle carries electric charge, Make absorption in rebar surface, and with its melt binding, by it is certain it is curing after just formed one layer it is complete, continuous, wrap The epoxy resin thin film protective layer of whole rebar surface.Epoxy coating is not reacted with it with acid, alkali etc., has high change Learn stability and ductility is big, drying shrinkage is small, there is the characteristics of splendid adhesiveness with metal surface, barrier is formd in rebar surface Its physical barriers contacted with moisture, oxygen, chloride or corrosive medium, meanwhile, also because it has barrier reinforcing bar and external world's electricity Flow the function of contact and be considered as chemical-electrical ion anti-corrosion barrier.

Utility model content

The purpose of this utility model is that providing a kind of seawater mixes curing concrete, the seawater mix in curing concrete by using Anti-corrosion coating reinforcing bar with specific structure, change the mode of action between reinforcing bar and concrete, reduce the introducing of coating to holding Bind round power abated effect.

To achieve the above object, the technical solution adopted in the utility model is：

A kind of seawater mixes curing concrete, including concrete mix and coated reinforcement, the concrete mix floating coat Reinforcing bar is arranged in desired manner；The coated reinforcement includes Ribbed Bar and epoxy coating, and epoxy coating is coated on ribbing Rebar surface；Wherein：The cross rib of the Ribbed Bar and the altitude range of longitudinal rib are 0.6-3.2mm, and cross rib top width scope is 0.4-2.5mm, longitudinal rib top width scope are 1.0-4.0mm；The diameter range of the Ribbed Bar is 6-50mm, the epoxy coating For SEBF coatings.The concrete mix refers to the concrete with seawater mixing, chloride total content in concrete mix For 0.2-0.5wt.%.

The cross rib center spacing range of the Ribbed Bar is 3.7-16mm, and cross rib end maximum spacing range is 1.8- 15.5mm。

The epoxy coating is individual layer or bilayer, and thickness in monolayer is 220~350 μm, and double-deck gross thickness is that 250-400 is micro- Rice, coating surface is smooth type or numb sand mold.

The end corner cut of the coated reinforcement removes acute angle by grinding process or forging and stamping, its end corner cut is turned into circle Angle.

Hoop power of holding between the epoxy coating and concrete of the coated reinforcement is 5000-10000Kg.

The preparation process that the seawater mixes curing concrete is：Coated reinforcement is produced first, then by coated reinforcement by required Mode is arranged into reinforcing bar web frame, finally the casting concrete mixture on reinforcing bar web frame, obtains the seawater and mixes foster coagulation Soil；Wherein：The production technology of the coated reinforcement comprises the following steps：

(1) Ribbed Bar of specification needed for raw material of reinforcement rebar selection；

(2) shaped piece of required structure is turned into after reinforcing bar cutting through bending forming；

(3) to specified size, and by the polishing of the corner cut at reinforcing bar both ends it is fillet through secondary cut by shaped piece；

(4) sprayed after the shaped piece surface treated and the pre-heat treatment after step (3) processing, spraying process uses Electrostatic or the spraying of friction rifle or fluid bed, epoxy coating is obtained after spraying in rebar surface；

(5) it is heating and curing：

(6) solidification cooling：According to the curing process parameter of powder, rear curing time and production line transmission speed, control are adjusted System circulation running water forces the time of cooling, is cooled to 100 DEG C of ＜, described anti-corrosion armored concrete is obtained after solidification cooling Use coated reinforcement.

In above-mentioned steps (4), the surface treatment refers to applied chemistry method or other methods for not reducing reinforcement property (such as Shot Blasting) carries out the surface of purified treatment reinforcing bar, and rebar surface must not have macroscopic pollutant and oxidative phenomena； Before application rebar surface without grease, it is dustless and without paint etc. dirt.

In above-mentioned steps (4), the pre-heat treatment refers to, before coating coating, steel surface preheats 150-350 DEG C, makes Measured with infrared thermometer or tempilstick.

After above-mentioned steps (6) carry out solidification cooling, reinforcing bar leak source and Thickness sensitivity are carried out to gained coated reinforcement, detected Detected in journey using DC low-voltage 67.5V or high-voltage spark leak detection tester, the coating layer thickness after solidification should design Scope between.

The utility model seawater, which mixes curing concrete, has advantages below and beneficial effect：

Coated reinforcement system not only needs to meet the barrier propterty in corrosive environment under arms, it is also necessary to takes into account Coated Steels Hoop power is held between muscle and concrete, the two is reached balance well and coordinates.Result of study shows, applies epoxy-coated reinforcement and holds Hoop power has declined compared with regular reinforcement, and forming the staple for holding hoop power has following three aspect：Machine between reinforcing bar and concrete Tool interlocking power, chemical adhesion and frictional force.The present invention starts with from mechanical interlocked power is improved, and improvement concrete-steel rib size is simultaneously excellent Change reinforcement parameter, decline so as to effectively solve the problems, such as to hold hoop power between coated reinforcement and concrete, make up to engineer applied Standard.

Brief description of the drawings

Fig. 1 (a) is that seawater of the present invention mixes curing concrete structural representation (seawater mixes curing concrete sectional drawing)；

Fig. 1 (b) is that seawater of the present invention mixes curing concrete structural representation (coated reinforcement sectional view)；

Fig. 1 (c) is that seawater of the present invention mixes curing concrete structural representation (Ribbed Bar)；

Reinforcing bar polarization curve (B1, H1, XB1, XH1) after Fig. 2 (a) soaks 4 days for each reinforcing bar sample in table 1；

Reinforcing bar polarization curve (B2, H2, XB2, XH2) after Fig. 2 (b) soaks 4 days for each reinforcing bar sample in table 1；

Reinforcing bar polarization curve (B3, H3, XB3, XH3) after Fig. 2 (c) soaks 4 days for each reinforcing bar sample in table 1；

Reinforcing bar electrochemical impedance figure (B1, H1, XB1, XH1) after Fig. 3 (a) soaks 9 days for each reinforcing bar sample in table 1；

Reinforcing bar electrochemical impedance figure (B2, H2, XB2, XH2) after Fig. 3 (b) soaks 9 days for each reinforcing bar sample in table 1；

Reinforcing bar electrochemical impedance figure (B3, H3, XB3, XH3) after Fig. 3 (c) soaks 9 days for each reinforcing bar sample in table 1；

Fig. 4 is paint line schematic diagram of the present invention.

Fig. 5 is Life Prediction Model of the coated reinforcement of the present invention under islands and reefs environment.

Fig. 6 is that seawater mixes curing concrete (left side) and fresh water mixes curing concrete (right side) shape appearance figure.

In figure：100- coated reinforcements；300- concrete mixs；1- epoxy coatings；2- Ribbed Bars；21- longitudinal ribs；22- Cross rib.

Embodiment

The present invention is described in detail below in conjunction with drawings and Examples.

Seawater of the present invention is mixed shown in structure such as Fig. 1 (a), Fig. 1 (b) and Fig. 1 (c) of curing concrete, and seawater mixes curing concrete Including concrete mix 300 and coated reinforcement 100, the floating coat reinforcing bar 100 of concrete mix 300 enters in desired manner Row arrangement；The coated reinforcement 100 includes Ribbed Bar 2 and epoxy coating 1, and epoxy coating 1 is coated on the surface of Ribbed Bar 2； The cross rib 22 of the Ribbed Bar 2 and the altitude range of longitudinal rib 21 are 0.6-3.2mm, and the top width scope of cross rib 22 is 0.4-2.5mm, The top width scope of longitudinal rib 21 is 1.0-4.0mm；The diameter range of the Ribbed Bar 2 is 6-50mm, and the epoxy coating 1 is SEBF Coating.The concrete mix refers to the concrete with seawater mixing, and chloride total content is 0.2- in concrete mix 0.5wt.%.

The cross rib center spacing range of the Ribbed Bar is 3.7-16mm, and cross rib end maximum spacing range is 1.8- 15.5mm.The epoxy coating is individual layer or bilayer.Thickness in monolayer is 220~350 μm, and double-deck gross thickness is 250-400 microns, Coating surface is smooth type or numb sand mold.The end corner cut of the coated reinforcement removes acute angle by grinding process or forging and stamping, makes Its end corner cut turns into fillet.

Above-mentioned Ribbed Bar specification is pressed in following comparative example and the selection of raw material of reinforcement rebar in embodiment.

Comparative example 1

The technological process of production of this example Epoxy Resin Coated Steel Bars：Raw material of reinforcement rebar selection → cutting → rebar surface processing (sandblasting purification, " feather plucking ") → the pre-heat treatment → electrostatic spraying → is heating and curing → solidified cooling → brake forming → secondary cut → bare metal repairs (reinforcing bar cut end mouth, corner coating damage) → practical application.

In process above, come with some shortcomings：(1) first spray epoxy coating is used, then carries out bending machining, this Prevent coated reinforcement performance, from ensureing well, knee coating is easy to crack, reinforcing bar has stress so that curved during military service Turn into barrier propterty weakest link at song, have following experiment as evidence.

Protective effect of the spray-on coating to reinforcing bar after bending and bending afterwards is first sprayed for contrast, has carried out following experiment：Choosing Coated reinforcement similar in the outward appearance of knee is selected, i.e., coating intact reinforcing bar in knee is research pair under magnifying glass and microscope As see the table below 1, corrosion resistance of both the research in high chlorine High Alkalinity Medium.

The coated reinforcement sample of the various processes of table 1 and coating layer thickness

By four groups in table 1 end reinforced connection copper conductors, knee is soaked in the concrete simulated solution for being introduced into chlorion. Periodically the chemical properties such as the polarization curve, OCP, impedance of reinforcing bar sample are tested.

By observing the bent portion outward appearance of reinforcing bar sample, the two is distinguished little from the appearance, but in microscope Under but it can be found that there is different degrees of rupture in the reinforcing bar coating surface that first sprays bending process again, and first bend and spray again Its face coat of painting reinforcing bar sample does not occur obvious slight crack.Spraying coating process is not after first bending is demonstrated in terms of the coating continuity Easily make coating cracking.

Polarization curve be assess the most basic method of metallic material corrosion, by corrosion potential and exchange current density come Assess, the smaller corrosion resistance of exchange current density is stronger.Carry out the measurement of polarization curve to each reinforcing bar sample in table 1, Fig. 2 (a), Fig. 2 (b) and Fig. 2 (c) is the polarization curve result of two type coating reinforcing bars., can be with by analyzing the polarization curve of reinforcing bar sample It was found that exchange current density is sequentially reduced along B groups → H groups → XB groups → XH groups, corrosion potential is gradually shuffled, and this explanation passes through elder generation The steel bar anti-corrosion corrosion of coating prepared by spraying coating process can be more preferable after bending；And relative to same process, coating, which thickeies, to be contributed to Corrosive nature improves.

Electrochemical impedance spectroscopy can effectively analyze the form of coated reinforcement failure, including can reflect that corrosive medium penetrates into and apply The state for causing coated reinforcement to corrode after layer.The electrochemical impedance spectroscopy (EIS) of two type coating reinforcing bars in table 1 is also surveyed Examination, test result are shown in Fig. 3 (a), Fig. 3 (b) and Fig. 3 (c).Pass through the electrochemical impedance atlas analysis to reinforcing bar, it can be seen that XH The electrochemical impedance collection of illustrative plates of the reinforcing bar sample of group differs markedly from other 3 groups, and the phase angle collection of illustrative plates of XH groups maintains coated reinforcement System soaks the feature at initial stage, represents now moisture and does not penetrate into coating/substrate interface, rebar surface does not corrode.Thus illustrate It is preferable first to bend shielding action of the coated reinforcement sprayed afterwards to corrosive medium.

(2) held after bending for forming dimension bad, it is necessary to carry out secondary cut test specimen, on the one hand, secondary cut is made Into raw material losses；On the other hand coating is destroyed, new repair coating is completed at the scene, and coating quality can not ensure, applies break Falling into turns into hidden danger.

Embodiment 1

The present embodiment is that seawater mixes the coated reinforcement used in curing concrete and the preparation process of the coated reinforcement, by changing Enter coated reinforcement structure and establish new paint line, the production line will become to the conventional coatings reinforcing bar mode of production Leather, overcomes the influence factor for bringing defect in production process to coated reinforcement.Main innovation route is, from adjustment concrete-steel rib knot Structure is started with, and changes the mode of action between reinforcing bar and concrete, and the abated effect of power is bound round in the introducing for reducing coating to holding；Change steel Muscle machining process, solve the problems, such as that wall and corner effect and coating processes produce stress；Establish environmentally friendly, efficient application work Skill.New coating reinforced bar engineering technology path is shown in Fig. 4.

The present invention formulates epoxy-coated reinforcement New Process：Raw material of reinforcement rebar selection → cutting → bending forming → bis- Secondary specified size → shaped piece surface treatment → the pre-heat treatment → spraying (fluid bed, electrostatic spraying) → that is cut to is heating and curing → solidification cooling → practical application；The technique detailed process is as follows：

(1) selection of raw material of reinforcement rebar：

The raw material of coated reinforcement are Ribbed Bar, and the altitude range of cross rib and longitudinal rib is 0.6-3.2mm, cross rib top width model It is 1.0-4.0mm to enclose for 0.4-2.5mm, longitudinal rib top width scope, and cross rib center spacing range is 3.7-16mm, and cross rib end is most Big spacing range is 1.8-15.5mm；The diameter range of Ribbed Bar is 6-50mm.

(2) surface treatment of reinforcing bar：

Applied chemistry method or other methods (such as Shot Blasting) for not reducing reinforcement property carry out purified treatment reinforcing bar Surface, rebar surface must not have macroscopic pollutant and oxidative phenomena.Rebar surface without grease, dustless and nothing before application The dirts such as paint.

(3) reinforcing bar preheats：

Before coating coating, steel surface is preheating to specified for temperature ranges, is surveyed using infrared thermometer or tempilstick Amount.

(4) reinforcing bar application：

With electrostatic or the spraying of friction rifle or fluid bed, individual layer film forming thickness individual layer：220~350 μm of (μ of minimum thickness ≮ 200 M), it is double-deck：250~400 μm (minimum thickness ≮ 220 μm), coating surface can should be smooth type or numb sand mold.

(5) reinforcing bar solidify afterwards and pressure cool down：

According to the curing process parameter of powder, rear curing time and production line transmission speed, control circulation running water are adjusted The time of cooling is forced, is cooled to 100 DEG C of ＜.

(6) reinforcing bar leak source and Thickness sensitivity：

Detected using DC low-voltage 67.5V or high-voltage spark leak detection tester, it is online to carry out shock processing parameter Adjustment, the coating layer thickness after solidification should be between the scope of design.

Performance detection：

Assess failure behaviour of the coating in seawater mixes curing concrete be inquire into seawater mix curing concrete should in Reef in Chinese South Sea Use Basic Ways.To mix curing concrete early stage of the invention to seawater and carry out part work, discovery is only used for no-reinforcing-bar structure, and Accumulation of salt in the surface soil phenomenon be present, limit its application, if wherein reinforcing bar can meet the requirement for anticorrosion of long-term use, will greatly increase Application feasibility, meanwhile, consider to be also required to solve the problems, such as the accumulation of salt in the surface soil from outward appearance.The present invention selects the coated reinforcement of different degree of protection For research object, using high temperature, drying and watering cycle Acceleration study method, contrast in high alkalinity and high Cl- concentration concrete solution Floating coat steel failure behavior, Life Prediction Model of the coated reinforcement under islands and reefs environment is established accordingly, differentiate that seawater is mixed to support and mix Solidifying soil is in islands and reefs application feasibility.Basic line is shown in Fig. 5.

The reinforcing bar coating performance test of the present embodiment is as follows：

(1) pin-free without defective workmanship, thickness is uniform, and thickness is not less than 300 μm；

(2) there is the coating of high long-term wet adhesion, it is one-level to be immersed in 90 DEG C/15 days in NaCl solution；Distillation Water, 15d, 1~2 grade；

(3) the anti-Cl of coating^-Permeability, 45d, 3mol/L NaCl, 24 DEG C, ＜ 1 × 10^-4M；

(4) salt spray test, 5wt.%NaCl, 35 DEG C, 800h；

(5) cathodic disbonding, 168h-1.5V 3wt.%NaCl, 24 DEG C, disbondment radius ＜ 3mm；

(6) adhesion strength, >=50MPa；

Abundant solidify coating can be used by reaching requirements above, improve crosslink density mode, because the steel using the present invention Muscle production technology, the bending resistance of coating is required to decline.Need to improve coating cure phase rheological property, reduce coating and formed During mobility.

For the new coating reinforcing bar of the present invention, its hoop power of holding with concrete is asking of must take into consideration in application process Topic, generally regulation hold the 85% of hoop power not less than naked reinforcing bar and concrete, but do not have clear stipulaties to specific data.Due to this hair It is bright to employ new structure rib type, add reinforcing bar and concrete longitudinal direction contact area, therefore hoop is held by improve corresponding reinforcing bar Power, following experiment is carried out for this.

To make the antiseptic property of coating strengthen with bruise resistance, double-deck melting FBE can be used.It is double Layer melting FBE is that once spraying film forming is completed, and the FBE of bottom provides antiseptic property, and outer layer increases Strong FBE improves the bruise resistances such as the shock resistance of coating.Because two layers of coatings has identical molecule Structure, there is good compatibility, do not allow to produce interlaminar separation phenomenon.It is applicable to the application of reinforcing bar.

Using Unite States Standard ASTM A944-10《Compare the standard of the adhesion strength of reinforcing bar and concrete using beam-ends test specimen Method of testing》, the adhesion strength of the present embodiment new reinforcing steel bar and concrete and coated reinforcement and concrete is tested.

The bar diameter of use is respectively two kinds of specifications of Φ 12mm and Φ 25mm, and reinforcing bar grade is HRB400E.It is every kind of Specification prepares 3 groups of reinforced concrete soil samples by national standard reinforcing bar, new reinforcing steel bar and the present embodiment coated reinforcement, and every group of sample contains 4 Sample, altogether 6 groups of 24 samples.The present embodiment coated reinforcement is sprayed using SEBF clinkery epoxy powder coatings, coating layer thickness control System is between 250~400 microns.Each grip hoop power measurement result such as table 2 below.

Table 2

Result above shows that the bond stress of the new reinforcing steel bar after the present embodiment optimization steel rib exceedes former national standard rebar standardses； The bond stress of the present embodiment new coating reinforcing bar has basically reached or more than uncoated former national standard rebar standards.

It is using the soak test of resistance to salt water, the coating rod iron of different systems is qualified rear embedding with leak source in detection thickness In live silicate concrete, using temperature, 23 DEG C ± 3 DEG C, 60 DEG C ± 3 DEG C are immersed in 3.5wt.%NaCl solution, point Not carry out 192 days and 85 days timeliness, observation coating rod iron is on active service failure procedure in concrete.Soaked from 3.5wt.%NaCl solution Stain by concrete rupture, takes out epoxy coating rod iron to after the aging time of design, carries out surface corrosion respectively and destroys and wet attached Put forth effort to test.

In terms of surface corrosion destructiveness, the surface of new coating rod iron of the present invention is intact, with 67.5V wet sponge leak detectors The coating for detecting each parcel is insulation.

Then draw in the coating surface knife of parcel location and be deep to the straight line of rod iron matrix, adhesive force experiment is done, with reference to SY/ T 0315-2013 wet adhesion standards, it is 1 grade by coating adhesion Experimental Evaluation.

Embodiment 2

The present embodiment is that the seawater for having used the floating coat reinforcing bar of embodiment 1 mixes curing concrete and its respective performances test.

The preparation process that the seawater mixes curing concrete is：Using the floating coat reinforcing bar of embodiment 1, by coated reinforcement by required Mode is arranged into reinforcing bar web frame, then the casting concrete mixture on reinforcing bar web frame, obtains the seawater and mixes foster coagulation Soil.

The problem that foster type concrete industry is construction engineering in the offshore is mixed in Reef in Chinese South Sea construction with seawater.From the south of collection Seawater and coral reef sand gather materials make seawater mix curing concrete, utilization rate of gathering materials on the spot be more than 75%.Simultaneously fresh water is carried out to mix Curing concrete contrasts, and measures compression strength and tensile splitting strength.

First, South China Sea and the composition that desalinizes seawater are respectively such as table 3 below and table 4 below：

The South China Sea of table 3 forms

The composition that table 4 desalinizes seawater

2nd, coral reef sandy soil main component：

Coral reef sandy soil main component is coral debris, and its particle is mainly anatomy particle.Most particle surfaces It is coarse, it is covered with hole, there is more layer structures and cage structure.Coral reef sandy soil in deposition process without long-distance carrying, The reasons such as the tiny hole in protist skeleton are maintained, form soil particle concrete dynamic modulus (containing inner pore), shape is not advised Then, the features such as grain corner degree is high, low intensity is broken, particle is easily cementing so that its engineering mechanics property and general terrestrial facies, sea Phase deposit, which is compared, larger difference.

The effective grain size of coral reef fine sand see the table below 5, and coral reef fine sand physico-chemical analysis the results are shown in Table 6.

The effective grain size (μm) of the coral reef fine sand of table 5

The coral reef fine sand physico-chemical analysis result of table 6

Desalinize seawater mix support in using repeatedly flushed by desalination water, until salt content is close to desalination in the water gone out Untill seawater, with Cl^‐Concentration is index less than 0.25g/L, usual 1dm³Coral reef fine sand needs 3~4dm³Desalination water.

3rd, concrete mix sample making：

Two batches strength comparison test has been carried out, has been mixed and stirred respectively with seawater and fresh water.Experiment coordinates such as table 7：

The contrast test concrete mix of table 7

Numbering	Cement	Sand	Water consumption	Additive	Flyash
						FC (fresh water is mixed foster)	270	810	180	3.5	75
SC (seawater is mixed foster)	270	810	185	3.8	75

The cement specimen that size is 100mm × 100mm × 100mm, test specimen immersion is made by the assay method of cement grade Maintenance, curing temperature are 30 DEG C ± 2 DEG C.

4th, concrete mix sample detection：

Seawater mixes curing concrete (left side) and fresh water mixes curing concrete pattern such as Fig. 6, from figure from concrete structure the two Difference is little.

5th, concrete mix sample mechanical property：

Compressive strength of concrete and axial compressive strength result are respectively as shown in table 8 and table 9.

The fresh water of table 8 and seawater mix curing concrete compression strength (MPa)

The fresh water of table 9 and seawater mix curing concrete axial compressive strength (MPa)

6th, the coated reinforcement in curing concrete is mixed applied to seawater：

As can be seen here, seawater mixes the mechanical strength of curing concrete and fresh water mixes curing concrete in terms of mechanics difference very little, It is corrosion of reinforcing steel bar therein that limitation seawater, which is mixed and supports the subject matter for mixing curing concrete application,.The present invention applies using in high-performance Layer is protected reinforcing bar therein, and the performance that the coating (DC) possesses see the table below, and the reinforcing bar coating commonly used with existing in the market (YL) contrasted.It see the table below 10.

10 common coating of table contrasts with high-performance coating Key Performance Indicator

7th, the coated reinforcement comparing result after accelerated test in the seawater：

Coated reinforcement and new coating reinforcing bar of the present invention that in the market is being applied mix the solution of curing concrete in seawater Middle progress accelerated test examination, accelerated method include high temperature (90 DEG C) and high pressure (1MPa), test result indicates that, existing Coated Steels Muscle and coated reinforcement of the present invention have portion after being soaked 4 days during 90 DEG C of seawater mix foster simulation concrete solution in existing coated reinforcement Coating is divided to be come off completely from reinforcing bar, and the coating on coated reinforcement of the present invention is without obscission.

Experiment can be drawn more than, can be with due to from low defect, low stress, the coated reinforcement that chlorion is immunized Ensure for a long time to stablize in seawater mixes curing concrete, expand application so as to promote seawater to mix curing concrete, solve off-lying sea island The problem of small island islands and reefs construction.And prepare this seawater that can be applied to and mix anti-corrosion coating reinforcing bar in curing concrete, except from closing Outside suitable coating, also there is strict demand to coating process, for example to avoid the generation of coating stress, abandon traditional coated reinforcement Coating process, and use machining then application mode in advance.

Explanation the preferred embodiments of the present invention are the foregoing is only, are not limited to protection scope of the present invention；It is all its It should be included in described patent application and power without departing from the equivalent change or modification completed under the disclosed spirit of invention In sharp claimed range.

Claims (5)

1. a kind of seawater mixes curing concrete, it is characterised in that：The seawater, which mixes curing concrete, includes concrete mix and Coated Steels Muscle, the concrete mix floating coat reinforcing bar are arranged in desired manner；The coated reinforcement includes Ribbed Bar and ring Oxygen coating, epoxy coating are coated on Ribbed Bar surface；Wherein：The cross rib of the Ribbed Bar and the altitude range of longitudinal rib are 0.6-3.2mm, cross rib top width scope are 0.4-2.5mm, and longitudinal rib top width scope is 1.0-4.0mm；The diameter of the Ribbed Bar Scope is 6-50mm, and the epoxy coating is SEBF coatings.

2. seawater according to claim 1 mixes curing concrete, it is characterised in that：The cross rib center spacing of the Ribbed Bar Scope is 3.7-16mm, and cross rib end maximum spacing range is 1.8-15.5mm.

3. seawater according to claim 1 mixes curing concrete, it is characterised in that：The epoxy coating is individual layer or bilayer, Thickness in monolayer is 220~350 μm, and double-deck gross thickness is 250-400 microns, and coating surface is smooth type or numb sand mold.

4. seawater according to claim 1 mixes curing concrete, it is characterised in that：The end corner cut of the coated reinforcement passes through Grinding process or forging and stamping remove acute angle, its end corner cut is turned into fillet.

5. seawater according to claim 1 mixes curing concrete, it is characterised in that：The epoxy coating of the coated reinforcement is with mixing Hoop power of holding between solidifying soil is 5000-10000Kg.