CN102418101A - Composite sacrificial anode for repairing reinforced concrete structure - Google Patents
Composite sacrificial anode for repairing reinforced concrete structure Download PDFInfo
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- CN102418101A CN102418101A CN2011103861691A CN201110386169A CN102418101A CN 102418101 A CN102418101 A CN 102418101A CN 2011103861691 A CN2011103861691 A CN 2011103861691A CN 201110386169 A CN201110386169 A CN 201110386169A CN 102418101 A CN102418101 A CN 102418101A
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- 239000011150 reinforced concrete Substances 0.000 title abstract description 8
- 239000002131 composite material Substances 0.000 title abstract description 4
- 229910001297 Zn alloy Inorganic materials 0.000 claims abstract description 33
- 239000004568 cement Substances 0.000 claims abstract description 31
- 239000000084 colloidal system Substances 0.000 claims abstract description 25
- 239000011701 zinc Substances 0.000 claims abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000010439 graphite Substances 0.000 claims abstract description 19
- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical compound [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 13
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 8
- -1 polypropylene Polymers 0.000 claims abstract description 8
- 239000004743 Polypropylene Substances 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims abstract description 7
- 229920001155 polypropylene Polymers 0.000 claims abstract description 7
- 239000000571 coke Substances 0.000 claims abstract description 5
- 239000004567 concrete Substances 0.000 claims description 47
- 230000003014 reinforcing effect Effects 0.000 claims description 43
- 238000010276 construction Methods 0.000 claims description 37
- 150000001875 compounds Chemical class 0.000 claims description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 30
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 19
- 229910052725 zinc Inorganic materials 0.000 claims description 13
- 229910052749 magnesium Inorganic materials 0.000 claims description 12
- 229910052718 tin Inorganic materials 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 238000005260 corrosion Methods 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 claims description 7
- 239000003469 silicate cement Substances 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000005275 alloying Methods 0.000 claims description 3
- BGOFCVIGEYGEOF-UJPOAAIJSA-N helicin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1OC1=CC=CC=C1C=O BGOFCVIGEYGEOF-UJPOAAIJSA-N 0.000 claims description 2
- 240000003936 Plumbago auriculata Species 0.000 claims 1
- 238000007654 immersion Methods 0.000 abstract description 8
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052801 chlorine Inorganic materials 0.000 abstract description 5
- 239000000460 chlorine Substances 0.000 abstract description 5
- 239000011398 Portland cement Substances 0.000 abstract 1
- 239000000440 bentonite Substances 0.000 abstract 1
- 229910000278 bentonite Inorganic materials 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 17
- 239000010959 steel Substances 0.000 description 17
- 238000004210 cathodic protection Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 10
- 239000004570 mortar (masonry) Substances 0.000 description 10
- 239000000047 product Substances 0.000 description 7
- 241000209456 Plumbago Species 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 229910021607 Silver chloride Inorganic materials 0.000 description 3
- 229910052793 cadmium Inorganic materials 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 229910000846 In alloy Inorganic materials 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
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- 241000196324 Embryophyta Species 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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Abstract
A composite sacrificial anode for repairing reinforced concrete structure is composed of zinc alloy sacrificial anode, high-conductivity cement colloid and connector. The zinc alloy sacrificial anode is coated in the cylindrical or cuboid high-conductivity cement colloid, and one end or two ends of the sacrificial anode are provided with connecting devices to be led out of the high-conductivity cement colloid. The formula of the zinc alloy sacrificial anode is Al: 0.3 to 1.2 percent; mg: 0.1 to 0.5 percent; si: 0.5-0.9%; sn: 0.15-0.65%; the balance of Zn. The high-conductivity cement colloid comprises portland cement, fine aggregate, coke breeze, graphite, lithium nitrate, bentonite and polypropylene fiber. The sacrificial anode is simple to install, easy to construct, low in price and long in service life, and is suitable for repairing reinforced concrete structures of bridges, wharfs, tunnels, underground parking lots and the like in full immersion areas, tidal range areas, splash areas, atmospheric areas and other chlorine environments in marine environments.
Description
Technical field
The present invention relates to a kind of compound sacrificial anode that skeleton construction is repaired that is used for, belong to the corrosion and protection field.
Background technology
So far; Skeleton construction is implemented the history in existing more than 30 year of galvanic protection abroad; Through development research and application practice for many years, all obtaining very big development aspect the monitoring of Steel Concrete negative electrode parameter and protecting standard, galvanic protection material and plant and instrument, cathodic protection system and the running maintenance.In recent years; The application of anticathode protection at prestressed reinforced concrete structure arranged; And galvanic protection carried out number of research projects and formulated relevant standards and norms prolonging with the effect aspect that keeps new reinforced concrete structure durability, effectively implements galvanic protection for Steel Concrete technical basis is provided.
The cathode protection technology of Steel Concrete is divided into two kinds of technology, i.e. impressed current cathodic protection technology and SACRIFICIAL ANODE CATHODIC PROTECTION again.Impressed current cathodic protection system has been widely used in states such as America and Europes; And formulated relevant standard specifications, like EN 12696:2000 Cathodic protection of steel in concrete and NACE RP0290-2000 Impressed Current Cathodic Protection of Reinforcing Steel in Atmospherically Exposed Concrete Structures.In recent years, the navigation bridge pier of domestic Construction of Hangzhou Bay Cross-sea Bridge and Transbay Bridge, Qingdao had adopted impressed current cathodic protection system to carry out the anti-corrosion measure of concrete reinforcement.The impressed current cathodic protection system construction technology is complicated, requires the construction operation condition high, and running cost is high, needs the professional and technical personnel and safeguards.
So far, external steel reinforced concrete sacrificial anode protection of developing mainly contains electric arc zn spraying or aluminium-plated-zinc-indium alloy, zinc paper tinsel/conduction cakingagent, zinc net/grout sheath etc.At home, Chinese patent CN 2813639Y is characterised in that through sand-cement slurry sacrificial anode is fixed on Steel Concrete tidal range district and the unrestrained surface of spattering the district.Use aluminium zinc indium alloy sacrificial anode, mortar is made up of fresh water, cement and super absorbent resin.Chinese patent CN 101109087A is characterised in that through electric conduction mortar stopping composition and matrix material sheath sacrificial anode is fixed on Steel Concrete tidal range district and the unrestrained surface of spattering the district.Its sacrificial anode is to be laid between mortar and the matrix material sheath, and the sacrificial anode of use is pure zinc or zinc alloy, and the electric conduction mortar stopping composition is made up of cement, graphite, wilkinite, aggregate etc.More than the technical scheme of two patents all is applicable to ocean environment tidal range district and wave spatters district's skeleton construction protection.The characteristic of Chinese patent CN 101244926A is that sacrificial anode is embedded in the active mortar; The be laid in surface of Steel Concrete of active mortar; Sacrificial anode adopts pure zinc or zinc alloy, and active mortar is made up of silicate cement, aggregate, water, synthon and active additive.This patent scheme is applicable to the protection of skeleton construction of the atmospheric environment of salt pollution.
Impressed current cathodic protection system need be laid supplementary anode, reference electrode and monitoring device when precast reinforced skeleton, crossed construction is serious; When pouring in down a chimney concrete, prevent supplementary anode and reinforcing bar short circuit again, we can say that the impressed current cathodic protection system construction technology is complicated; Require the construction operation condition high; And after concrete placement is accomplished,, can not repair in case find supplementary anode and reinforcing bar short circuit.Because system forms complicated, need the professional and technical personnel and safeguard, through regular meeting maintenance and management taking place is not good at and causes whole system to lose efficacy.Bothersome effort when adopting this method that concrete is repaired, feasibility is not strong, mainly is to be used in the newly-built skeleton construction.
For the concrete sacrificial anode cathodic protection technology, domestic patent all is the corrosionproof protection method to certain zone of skeleton construction (tidal range district, wave spatter district, atmospheric zone), mostly to the ocean environment condition; Versatility is short of to some extent, and construction technology is comparatively loaded down with trivial details, needs earlier fixedly zinc net such as patent CN 101109087A; Fixed sheath again; Add electric conduction mortar at last, when rehabilitating concrete, need be according to the concrete shape machining composite material sheath of skeleton construction; Process-cycle is longer, and the volume and weight of sheath is given in the installation process and also brought very big inconvenience; Patent CN 101244926A has introduced steel reinforced concrete sacrificial anode protector and method in the atmospheric environment; Need to lay grid zinc sacrificial anode in its method; Couple together sacrificial anode and reinforcing bar through terminal box; Lay electric conduction mortar at last, this method construction technology is comparatively complicated, and the protection zone is merely atmospheric zone.Patent CN 2813639Y spatters the position, district to tidal range district and wave and protects, and requires the minimum line of constructing after the mortar pouring is solidified to want submergence low tide bit line.But the position of low tide bit line is difficult to again confirm in the ocean environment, and influence factor is very complicated.Under the usual conditions, areal, under Various Seasonal and different geographical conditions, LWL differs greatly.Therefore, can not confirm effectively that Steel Concrete tidal range district and wave spatter the protection area and the construction area in district.The used sacrificial anode of above patent is pure zinc or GB sacrificial zinc alloy anode mostly, does not does not research and develop a kind of novel sacrificial anode material.
Summary of the invention
For satisfying the working condition that skeleton construction is repaired, overcome the shortcoming that present SACRIFICIAL ANODE CATHODIC PROTECTION exists, the present invention provides a kind of compound sacrificial anode.
Technical scheme of the present invention is: a kind of compound sacrificial anode that is used for the skeleton construction reparation; It is characterized in that; Comprise high electroconductive cement colloid and parcel sacrificial zinc alloy anode within it; High electroconductive cement colloid is drawn through lead or iron core in the one or both ends of sacrificial zinc alloy anode, and lead and iron core are used to be welded on the concrete reinforcing bar that will repair.
Described sacrificial zinc alloy anode is in the zinc-base body, to add alloying element, obtains sacrificial anode through the ratio of controlling alloy element Al, Mg, Si, Sn element, can satisfy in the high resistivity concrete medium and use.
The prescription of its sacrificial zinc alloy anode is Al:0.3-1.2%; Mg:0.1-0.5%; Si:0.5-0.9%; Sn:0.15-0.65%; Foreign matter content: Fe≤0.005%; Cu≤0.005%; Pb≤0.01%; Cd≤0.003%; Surplus is Zn; Zinc ingot metal is melted in process furnace with plumbago crucible, in fused zinc liquid, add Al, Mg, Si, Sn, stir with graphite rod by proportioning, slagging-off, tapping casting is in the mould of lead that places in advance or iron core.
Described high electroconductive cement colloid comprises silicate cement, fine aggregate, coke breeze, graphite, lithium nitrate, wilkinite and polypropylene fibre.
Described mould adopts the helical groove mould; Mold spiral helicine sacrificial zinc alloy anode; Its objective is increases sacrificial zinc alloy anode and high electroconductive cement colloidal contact area; Make sacrificial zinc alloy anode keep active for a long time, send electric current, also be convenient to absorb simultaneously the corrosion product that sacrificial anode produces.
An iron nose is welded in the outer end of described lead, welds with the concrete reinforcing bar that will repair with convenient.
Described high electroconductive cement colloid has two kinds of shapes, and a kind of is right cylinder, and another kind is a rectangular parallelepiped.
The present invention compared with prior art has the following advantages:
(1) applied range is applicable to that continuous immersion zone under the ocean environment, tidal range district, wave spatter the reparation of skeleton constructions such as bridge under district, atmospheric zone and other chlorine environment, harbour, tunnel, underground parking.
(2) construction technology is simple, after steel bars in concrete is directly polished, directly is welded on compound sacrificial anode on the reinforcing bar and gets final product, and does not influence concrete outward appearance and quality of concrete.
(3) high electroconductive cement colloid can fully absorb the corrosion product that sacrificial zinc alloy anode produces, and has higher water-retentivity, and can not influence concrete performance.
(4) the longest design service life of sacrificial anode system can reach 50 years.
(5) compound sacrificial anode body is cheap, once drops into, and need not the professional person and safeguards.
(6) reinforcing bar protection criterion can satisfy the 100mV potential decay criterion of EN 12696:2000 defined; For the ocean environment continuous immersion zone, switch-off potential can reach more than the 150mV decay in 24 hours; Spatter district and tidal range district for wave, switch-off potential can reach more than the 120mV decay in 24 hours; In the atmospheric environment for chloride environment, switch-off potential can reach more than the 100mV decay in 24 hours.
(7) install simple, be easy to construction, be applicable to that continuous immersion zone under the ocean environment, tidal range district, wave spatter the reparation of skeleton constructions such as bridge under district, atmospheric zone and other chlorine environment, harbour, tunnel, underground parking.
Description of drawings
Fig. 1 is three-dimensional arrangement (broken section) synoptic diagram of the first embodiment of the present invention (right cylinder);
Fig. 2 is three-dimensional arrangement (broken section) synoptic diagram of the second embodiment of the present invention (rectangular parallelepiped);
Fig. 3 first embodiment of the present invention is applied in the structural representation of Steel Concrete;
Fig. 4 second embodiment of the present invention is applied in the structural representation of Steel Concrete.
Among the figure: the high electroconductive cement colloid of 1-; The 2-sacrificial zinc alloy anode; The 3-thermal shrinkable sleeve; The 4-lead; 5-iron nose; The 6-iron core; The 7-reinforcing bar; The 9-concrete; The compound sacrificial anode of A-right cylinder; The compound sacrificial anode of B-rectangular parallelepiped.
Embodiment
Referring to Fig. 1～Fig. 4; The present invention is used for the compound sacrificial anode that skeleton construction is repaired; Comprise high electroconductive cement colloid 1 and parcel sacrificial zinc alloy anode 2 within it; High electroconductive cement colloid 1 (as shown in Figure 1) is drawn through lead 4 in the one or both ends of high-performance sacrificial zinc alloy anode 2, or through drawing high electroconductive cement colloid 1 (as shown in Figure 2) with the iron core 6 of the one or both ends of sacrificial zinc alloy anode 2 welding.Lead 4 is used to be welded on the concrete reinforcing bar 7 that will repair with iron core 6.The outer end of lead 4 also can be welded an iron nose 5 and welded with the concrete reinforcing bar that will repair 7 with convenient.
High electroconductive cement colloid 1 of the present invention has two kinds of shapes, and a kind of is right cylinder (as shown in Figure 1), and another kind is rectangular parallelepiped (as shown in Figure 2).
Described sacrificial zinc alloy anode 2 is in the zinc-base body, to add alloying element, obtains sacrificial anode through the ratio of controlling alloy element Al, Mg, Si, Sn element, can satisfy in the high resistivity concrete medium and use.The prescription of its sacrificial zinc alloy anode is Al:0.3-1.2%; Mg:0.1-0.5%; Si:0.5-0.9%; Sn:0.15-0.65%; Foreign matter content: Fe≤0.005%; Cu≤0.005%; Pb≤0.01%; Cd≤0.003%; Surplus is Zn.Zinc ingot metal is melted in process furnace with plumbago crucible, in fused zinc liquid, add Al, Mg, Si, Sn, stir with graphite rod by proportioning, slagging-off, tapping casting is in the mould of the iron core that places in advance.
Admittedly molten sacrificial zinc alloy anode mould adopts the spirrillum mould; Its objective is the contact area that increases sacrificial zinc alloy anode 2 and high electroconductive cement colloid 1; Make the sacrificial zinc alloy anode 2 long-term activity that keep, send electric current, also be convenient to absorb simultaneously the corrosion product that sacrificial anode produces.
High electroconductive cement colloid 1 is mainly by being made up of silicate cement, fine aggregate, electro-conductive material, synthon.Electro-conductive material is made up of coke breeze, graphite, lithium nitrate, wilkinite, and synthon adopt polypropylene fibre.Formulation ratio is seen table 1 in detail.
Table 1, high electroconductive cement colloidal prescription
When using the present invention that Steel Concrete is repaired; Two kinds of mounting means are arranged: a kind of mounting means is referring to Fig. 3; On the skeleton construction of needs reparation, get columniform hole with electric drill, size is advisable can put into the compound sacrificial anode A of right cylinder of the present invention; Cut a little block concrete on its hole next door then and expose a bit of reinforcing bar 7, remove the corrosion product on these segment reinforcing bar 7 surfaces,, weld with the iron nose 5 of compound sacrificial anode so that expose rebar matrix; Good lead 4 and compound sacrificial anode A water mudding.
Another kind of mounting means is as shown in Figure 4; Reinforced concrete structure erosion is comparatively serious, has exposed part reinforcing bar 7, and the compound sacrificial anode B of rectangle is gone up in the welding after polishing of exposed reinforcing bar 7; The iron core 6 at sacrificial anode two ends all welds with reinforcing bar 7; According to the construction requirement of rehabilitating concrete, fill concrete is accomplished construction then.
Be several specific embodiment of the present invention below.
Embodiment 1:
Adopt compound sacrificial anode of the present invention to the Steel Concrete reparation of ocean environment continuous immersion zone, the prescription of sacrificial zinc alloy anode 2 is Al:0.35%, Mg:0.3%; Si:0.85%, Sn:0.28%, foreign matter content: Fe≤0.005%; Cu≤0.005%; Pb≤0.01%, Cd≤0.003%, surplus is Zn.Zinc ingot metal is melted in process furnace with plumbago crucible, in fused zinc liquid, add Al, Mg, Si, Sn, stir with graphite rod by proportioning, slagging-off, tapping casting is in the spirrillum mould of the iron core that places in advance 6.The prescription of high electroconductive cement colloid 1 is silicate cement: sand: graphite: wilkinite: lithium nitrate: polypropylene fibre: water=1:0.95:0.1:0.15:0.06:0.006:0.5.Spirrillum sacrificial anode 2 is put into rectangular obturator mould,, in stopping composition (the high electroconductive cement colloid 1) mould of packing into, after the curing, promptly get the compound sacrificial anode B of the present invention shown in Figure 2 finished product according to above-mentioned prescription.
Use when of the present invention; Compound sacrificial anode is welded on the reinforcing bar 7 of polishing, with connecting a cut-off switch between reinforcing bar 7 and the compound sacrificial anode B, so that cutoff circuit; Measure switch-off potential; And around reinforcing bar, bury the Ag/AgCl reference electrode synchronously underground, measure the current potential of reinforcing bar 7, fill concrete.Table 2 is a reinforcing bar 7 after breaking off with compound sacrificial anode, the potential value of decay in 24 hours.The result shows reinforcing bar 7 after breaking off compound sacrificial anode B, and reinforcing bar 7 decay current potentials reach 164mV in 24 hours, satisfy the requirement of EN 12696:2000.
The potential value of table 2 ocean environment continuous immersion zone reinforcing bar decay in 24 hours
| Time (h) | 0 | 1 | 2 | 4 | 6 | 8 | 10 |
| Current potential (mV) | -1026 | -1001 | -988 | -957 | -933 | -916 | -907 |
| Time (h) | 12 | 14 | 16 | 18 | 20 | 22 | 24 |
| Current potential (mV) | -899 | -890 | -881 | -876 | -870 | -865 | -862 |
Embodiment 2:
Adopt compound sacrificial anode of the present invention to the Steel Concrete reparation in ocean environment tidal range district, the prescription of sacrificial zinc alloy anode 2 is Al:0.65%, Mg:0.48%; Si:0.55%, Sn:0.33%, foreign matter content: Fe≤0.005%; Cu≤0.005%; Pb≤0.01%, Cd≤0.003%, surplus is Zn.Zinc ingot metal is melted in process furnace with plumbago crucible, in fused zinc liquid, add Al, Mg, Si, Sn, stir with graphite rod by proportioning, slagging-off, tapping casting is in the spirrillum mould of the iron core that places in advance.High electroconductive cement colloid 1 prescription is silicate cement: sand: coke: wilkinite: lithium nitrate: polypropylene fibre: water=1:0.85:0.15:0.18:0.10:0.005:0.85.Spirrillum sacrificial anode 2 is put into rectangular obturator mould,, high electroconductive cement colloid 1 is packed in the mould, after the curing, promptly get the compound sacrificial anode B of the present invention shown in Figure 2 product according to above-mentioned prescription.
Compound sacrificial anode is welded on the reinforcing bar of polishing, with connecting a cut-off switch between reinforcing bar and the sacrificial anode, so that cutoff circuit; Measure switch-off potential; And around reinforcing bar, bury the Ag/AgCl reference electrode synchronously underground, measure the current potential of reinforcing bar, fill concrete.Table 2 is a reinforcing bar after breaking off with compound sacrificial anode, the potential value of decay in 24 hours.The result shows reinforcing bar after breaking off sacrificial anode, and reinforcing bar decay current potential reaches 127mV in 24 hours, satisfies the requirement of EN 12696:2000.
The potential value of table 2 ocean environment continuous immersion zone reinforcing bar decay in 24 hours
| Time (h) | 0 | 1 | 2 | 4 | 6 | 8 | 10 |
| Current potential (mV) | -919 | -902 | -887 | -875 | -861 | -846 | -833 |
| Time (h) | 12 | 14 | 16 | 18 | 20 | 22 | 24 |
| Current potential (mV) | -822 | -813 | -810 | -804 | -799 | -795 | -792 |
Embodiment 3:
Compound sacrificial anode of the present invention is adopted in Steel Concrete reparation to the atmospheric zone of chloride environment, and the prescription of high-performance sacrificial zinc alloy anode is Al:0.82%, Mg:0.4%; Si:0.5%, Sn:0.6%, foreign matter content: Fe≤0.005%; Cu≤0.005%; Pb≤0.01%, Cd≤0.003%, surplus is Zn.Zinc ingot metal is melted in process furnace with plumbago crucible, in fused zinc liquid, add Al, Mg, Si, Sn, stir with graphite rod by proportioning, slagging-off, tapping casting is in the spirrillum mould of the iron core that places in advance.High electroconductive cement colloid prescription is silicate cement: sand: graphite: wilkinite: lithium nitrate: polypropylene fibre: water=1:0.65:0.14:0.2:0.010:0.008:0.65.The spirrillum sacrificial anode is put into cylindrical obturator mould,, stopping composition is packed in the mould, after the curing, promptly get compound sacrificial anode A finished product shown in Figure 1 according to above-mentioned prescription.
The iron nose 5 of compound sacrificial anode is welded on the reinforcing bar 7 of polishing, with connecting a cut-off switch between reinforcing bar 7 and the sacrificial anode 2, so that cutoff circuit; Measure switch-off potential; And around reinforcing bar, bury the Ag/AgCl reference electrode synchronously underground, measure the current potential of reinforcing bar, fill concrete.Table 2 is a reinforcing bar after breaking off with compound sacrificial anode, the potential value of decay in 24 hours.The result shows reinforcing bar after breaking off sacrificial anode, and reinforcing bar decay current potential reaches 115mV in 24 hours, satisfies the requirement of EN 12696:2000.Content ratio in the present invention's prescription is mass ratio.
The potential value of table 2 chlorine ambient atmosphere district reinforcing bar decay in 24 hours
| Time (h) | 0 | 1 | 2 | 4 | 6 | 8 | 10 |
| Current potential (mV) | -626 | -615 | -605 | -594 | -583 | -571 | -560 |
| Time (h) | 12 | 14 | 16 | 18 | 20 | 22 | 24 |
| Current potential (mV) | -551 | -543 | -537 | -529 | -522 | -515 | -511 |
When skeleton construction is carried out sectional repair; This compound sacrificial anode body is installed in the concrete of repairing; Protection to reinforcing bar in the old concrete not only can be provided, can also eliminate the ring anodic corrosion effect that forms between the reinforcing bar in the reinforcing bar and mending concrete in the old concrete, prolong the work-ing life after the concrete structure maintenance greatly; Construction is installed simply, is easy to this sacrificial anode; Cheap, the life-span is long, is applicable to that continuous immersion zone under the ocean environment, tidal range district, wave spatter the reparation of skeleton constructions such as bridge under district, atmospheric zone and other chlorine environment, harbour, tunnel, underground parking.
Claims (7)
1. one kind is used for the compound sacrificial anode that skeleton construction is repaired; It is characterized in that; Comprise high electroconductive cement colloid and parcel sacrificial zinc alloy anode within it; High electroconductive cement colloid is drawn through lead or iron core in the one or both ends of sacrificial zinc alloy anode, and lead and iron core are used to be welded on the concrete reinforcing bar that will repair.
2. the compound sacrificial anode that is used for the skeleton construction reparation according to claim 1; It is characterized in that; Described sacrificial zinc alloy anode is in the zinc-base body, to add alloying element; Ratio through control alloy element Al, Mg, Si, Sn element obtains sacrificial anode, can satisfy in the high resistivity concrete medium and use.
3. the compound sacrificial anode that is used for the skeleton construction reparation according to claim 1 is characterized in that the prescription of its sacrificial zinc alloy anode is Al:0.3-1.2%; Mg:0.1-0.5%; Si:0.5-0.9%; Sn:0.15-0.65%; Foreign matter content: Fe≤0.005%; Cu≤0.005%; Pb≤0.01%; Cd≤0.003%; Surplus is Zn (mass ratio); Zinc ingot metal is melted in process furnace with plumbago crucible, in fused zinc liquid, add Al, Mg, Si, Sn, stir with graphite rod by proportioning, slagging-off, tapping casting is in the mould of lead that places in advance or iron core.
4. the compound sacrificial anode that is used for the skeleton construction reparation according to claim 1 is characterized in that described high electroconductive cement colloid comprises silicate cement, fine aggregate, coke breeze, graphite, lithium nitrate, wilkinite and polypropylene fibre.
5. the compound sacrificial anode that is used for the skeleton construction reparation according to claim 1; It is characterized in that described mould adopts the helical groove mould, molds spiral helicine sacrificial zinc alloy anode; Its objective is increases sacrificial zinc alloy anode and high electroconductive cement colloidal contact area; Make sacrificial zinc alloy anode keep active for a long time, send electric current, also be convenient to absorb simultaneously the corrosion product that sacrificial anode produces.
6. the compound sacrificial anode that is used for the skeleton construction reparation according to claim 1 is characterized in that an iron nose is welded in the outer end of described lead, welds with the concrete reinforcing bar that will repair with convenient.
7. the compound sacrificial anode that is used for the skeleton construction reparation according to claim 1 is characterized in that described high electroconductive cement colloid has two kinds of shapes, and a kind of is right cylinder, and another kind is a rectangular parallelepiped.
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| CN103469212A (en) * | 2013-08-05 | 2013-12-25 | 青岛双瑞海洋环境工程股份有限公司 | Positive electrode conductive filler used for negative electrode protection system of reinforced concrete |
| CN103641362A (en) * | 2013-11-29 | 2014-03-19 | 江苏百瑞吉新材料有限公司 | Concrete modifying agent |
| CN104498963A (en) * | 2014-12-09 | 2015-04-08 | 中交四航工程研究院有限公司 | Marine concrete buried high-activity sacrificial anode |
| RU2561194C2 (en) * | 2013-08-29 | 2015-08-27 | Вадим Эдуардович Поплавский | Anode earthing electrode |
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| CN108179424A (en) * | 2017-12-28 | 2018-06-19 | 浙江钰烯腐蚀控制股份有限公司 | A kind of novel sacrificial anode and its construction method |
| CN114622605A (en) * | 2022-03-11 | 2022-06-14 | 国网甘肃省电力公司经济技术研究院 | Resistance tomography monitoring device and monitoring method for cast-in-place concrete pile |
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| CN104498963B (en) * | 2014-12-09 | 2017-08-08 | 中交四航工程研究院有限公司 | Maritime concrete flush type high activity sacrificial anode |
| CN104498963A (en) * | 2014-12-09 | 2015-04-08 | 中交四航工程研究院有限公司 | Marine concrete buried high-activity sacrificial anode |
| CN105624689A (en) * | 2016-04-08 | 2016-06-01 | 厦门大学 | Corrosion automatic detection and intelligent protection system |
| CN107663636A (en) * | 2016-07-27 | 2018-02-06 | 上海法赫桥梁隧道养护工程技术有限公司 | Sacrificial anode and preparation method thereof built in a kind of reinforcement in concrete anticorrosion use |
| CN106757058A (en) * | 2016-12-23 | 2017-05-31 | 上海法赫桥梁隧道养护工程技术有限公司 | A kind of armored concrete anti-corrosion sacrificial anode |
| CN108179424A (en) * | 2017-12-28 | 2018-06-19 | 浙江钰烯腐蚀控制股份有限公司 | A kind of novel sacrificial anode and its construction method |
| CN108179424B (en) * | 2017-12-28 | 2023-08-11 | 浙江钰烯腐蚀控制股份有限公司 | Sacrificial anode and construction method thereof |
| CN114622605A (en) * | 2022-03-11 | 2022-06-14 | 国网甘肃省电力公司经济技术研究院 | Resistance tomography monitoring device and monitoring method for cast-in-place concrete pile |
| CN116641059A (en) * | 2023-05-25 | 2023-08-25 | 水利部交通运输部国家能源局南京水利科学研究院 | Directional absorption device and method for reinforced concrete chloride ions |
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