CN105130238A - Method for smearing lithium nitrite mortar on surface of reinforced concrete to resist rust - Google Patents
Method for smearing lithium nitrite mortar on surface of reinforced concrete to resist rust Download PDFInfo
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- CN105130238A CN105130238A CN201510528151.9A CN201510528151A CN105130238A CN 105130238 A CN105130238 A CN 105130238A CN 201510528151 A CN201510528151 A CN 201510528151A CN 105130238 A CN105130238 A CN 105130238A
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- lithium nitrite
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Abstract
The invention discloses a method for smearing lithium nitrite mortar on the surface of reinforced concrete to resist rust. The method is characterized by comprising: firstly finding out a rusty part; polishing a concrete structure of the rusty part by 5-10 mm; then wetting a polishing face by using a lithium nitrite saturated aqueous solution, wherein a water film is formed on the polishing face; and finally, smearing the lithium nitrite mortar on the polishing face and after the lithium nitrite mortar is finally set and hardened, watering the concrete to maintain the concrete. The method has the advantages that the method is simple and convenient to operate and effective and can accelerate the seepage velocity of a lithium nitrite solution in the concrete, so that the lithium nitrite mortar is suitable for being used as a penetrating rust inhibitor which is smeared on the surface of the reinforced concrete structure. Moreover, according to the method, before smearing, 5-10 mm of the concrete structure in the rusty part is polished by using a polishing machine, so that space is provided for smearing the lithium nitrite mortar and the nitrite ions permeate into the concrete structure more easily, and the requirement on the depth of penetration of the nitrite ions is further reduced. The method is particularly suitable for repairing the concrete structure which is not suitable to be smeared by using the rust inhibitor solution as a crack is oversized if the concrete structure is cracked.
Description
Technical field
The present invention relates to the resistance rust method of skeleton construction in building field, particularly relate to a kind of lithium nitrite mortar and smear resistance rust method at reinforced concrete surface.
Background technology
Nitrite has good inhibition of corrosion as the reinforcing steel bar corrosion inhibitor in skeleton construction, it antirust/resistance rust effect be decided by Chloride Ion in Concrete and nitrite ion mole ratio.Chloride content is larger, suppresses the NO needed for reinforcement corrosion
2 -/ CI
-mole ratio larger.China's " Technical code for application of admixture in concrete " specifies: villaumite resistance rust class concrete antifreezer, and when villaumite volume is 0.5% ~ 1.5% of cement weight, Sodium Nitrite should be greater than 1 with the ratio of villaumite; And when villaumite volume is 1.5% ~ 3% of cement weight, Sodium Nitrite should be greater than 1.3% with the ratio of villaumite, but the prerequisite of this anticorrosive measure is: during concrete batching, nitrite is mixed in concrete in advance, make to form uniform nitrite anions protection against corrosion environment around reinforcing bar, therefore nitrite is many is applied in engineering as internal doping type rust inhibitor.And due to the Retarder theory of nitrite naturally osmotic in concrete, its application spreading upon skeleton construction surface as osmosis type rust inhibitor is less.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind ofly accelerates the seepage velocity of nitrite solution in concrete, repairs the lithium nitrite mortar used and smears resistance rust method to be suitable as outer painting at reinforced concrete surface.
The present invention solves the problems of the technologies described above adopted technical scheme: lithium nitrite mortar smears resistance rust method at reinforced concrete surface, comprises following concrete steps:
(1), with steel bar corrosion instrument skeleton construction is tested, find out rusty part;
(2), with sander, the concrete structure of rusty part is polished off 5 ~ 10mm;
(3), lithium nitrite is deployed into lithium nitrite saturated aqueous solution;
(4), with lithium nitrite saturated aqueous solution soak buffed surface, make buffed surface form water membrane, be conducive to lithium nitrite in lithium nitrite mortar and permeate with concrete contact;
(5), by lithium nitrite and mortar carry out Homogeneous phase mixing, be deployed into lithium nitrite mortar, wherein in lithium nitrite and mortar, the mass ratio of cement is 2 ~ 2.5:100;
(6), by lithium nitrite mortar spread upon until equal with the concrete structure of periphery on buffed surface, after lithium nitrite mortar final set sclerosis, water seasoning under normal temperature environment.
Compared with prior art, advantage of the present invention is that the method is effectively easy and simple to handle, the seepage velocity of nitrite solution in concrete can be accelerated, make its be suitable as osmosis type rust inhibitor spread upon skeleton construction surface use, and the concrete structure of rusty part is first polished off 5 ~ 10mm with sander by present method before smearing, this is not only smears lithium nitrite mortar lifting for space, nitrite ion is made more easily to penetrate into the inside of concrete structure, but also the requirement reduced nitrite ion depth of penetration, be particularly suitable for the excessive reparation should not smearing situation with rust inhibitor solution in crack after concrete structure cracking, and to the structure properties of concrete body without obvious negative effect, in addition, in present method, adopt lithium nitrite as reinforcing steel bar corrosion inhibitor, the harm of the Steel Concrete alkali-aggregate reaction that oxynitroso reinforcing steel bar corrosion inhibitor causes can be eliminated and slow down the blood coagulation enhancing effect of oxynitroso reinforcing steel bar corrosion inhibitor to mortar coagulation time.
Accompanying drawing explanation
Fig. 1 (a) and (b), (c), (d) are respectively the present invention's comparison diagram to the concrete Nitrite mass concentration of the concrete test block of Different Water-Cement Ratio in varying environment, different time in proof test:
Wherein: (a) represents the time variations comparison diagram of 60%RH, 0.5 water cement ratio concrete test block Nitrite concentration;
B () represents the time variations comparison diagram of 90%RH, 0.5 water cement ratio concrete test block Nitrite concentration;
C () represents the time variations comparison diagram of 60%RH, 0.6 water cement ratio concrete test block Nitrite concentration;
D () represents the time variations comparison diagram of 90%RH, 0.6 water cement ratio concrete test block Nitrite concentration.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment one: lithium nitrite mortar smears resistance rust method at reinforced concrete surface, comprises following concrete steps:
(1), with steel bar corrosion instrument skeleton construction is tested, find out rusty part;
(2), with sander, the concrete structure of rusty part is polished off 5mm;
(3), lithium nitrite is deployed into lithium nitrite saturated aqueous solution;
(4), with lithium nitrite saturated aqueous solution soak buffed surface, make buffed surface form water membrane;
(5), by lithium nitrite and mortar carry out Homogeneous phase mixing, be deployed into lithium nitrite mortar, wherein in lithium nitrite and mortar, the mass ratio of cement is 2.5:100;
(6), by lithium nitrite mortar spread upon until equal with the concrete structure of periphery on buffed surface, after lithium nitrite mortar final set sclerosis, water seasoning under normal temperature environment.
Embodiment two: lithium nitrite mortar smears resistance rust method at reinforced concrete surface, comprises following concrete steps:
(1), with steel bar corrosion instrument skeleton construction is tested, find out rusty part;
(2), with sander, the concrete structure of rusty part is polished off 10mm;
(3), lithium nitrite is deployed into lithium nitrite saturated aqueous solution;
(4), with lithium nitrite saturated aqueous solution soak buffed surface, make buffed surface form water membrane;
(5), by lithium nitrite and mortar carry out Homogeneous phase mixing, be deployed into lithium nitrite mortar, wherein in lithium nitrite and mortar, the mass ratio of cement is 2:100;
(6), by lithium nitrite mortar spread upon until equal with the concrete structure of periphery on buffed surface, after lithium nitrite mortar final set sclerosis, water seasoning under normal temperature environment.
Embodiment three: lithium nitrite mortar smears resistance rust method at reinforced concrete surface, comprises following concrete steps:
(1), with steel bar corrosion instrument skeleton construction is tested, find out rusty part;
(2), with sander, the concrete structure of rusty part is polished off 8mm;
(3), lithium nitrite is deployed into lithium nitrite saturated aqueous solution;
(4), with lithium nitrite saturated aqueous solution soak buffed surface, make buffed surface form water membrane;
(5), by lithium nitrite and mortar carry out Homogeneous phase mixing, be deployed into lithium nitrite mortar, wherein in lithium nitrite and mortar, the mass ratio of cement is 2.2:100;
(6), by lithium nitrite mortar spread upon until equal with the concrete structure of periphery on buffed surface, after lithium nitrite mortar final set sclerosis, water seasoning under normal temperature environment.
Carry out following test to aforesaid method to prove:
Making water cement ratio respectively according to the regulation of national current standards " concrete admixture " GB8076 and " common concrete proportioning code " JGJ55 is 0.5 and 0.6, inside mixes 2Kg/m
3the formation of concrete test block of chlorion, is of a size of 500mm × 500mm × 150mm, normal curing 28 days.Then epoxy resin is smeared in four sides of concrete test block, (500mm × 500mm) is wiped one's face as the painting of lithium nitrite mortar in the bottom surface of concrete test block, first 5 ~ 10mm is polished off by being coated with the surface layer sander of wiping one's face before smearing, buffed surface is soaked again with lithium nitrite saturated aqueous solution, lithium nitrite mortar 5 ~ 10mm is smeared afterwards on buffed surface, after lithium nitrite mortar final set sclerosis, 20 DEG C, continue maintenance, for the nitrite anions concentration measuring infiltration in the curing room of relative humidity 60% and 90%.
Nitrite anions concentration determination: the osmotic concentration of nitrite anions in concrete structure was measured once respectively every 3 days, 90 days, 180 days, 360 days, Φ 100mrn × 60mm concrete core is got with rig during mensuration, and from surface internally direction with 10mm interval cut off core, for mensuration nitrite anions concentration, the mensuration of nitrite anions concentration is carried out according to JCI-SC regulation, get levigate 2g sample to sieve by 80 mesh sieve, then in 50 DEG C of warm water, extract solubility nitrite ion, measure with ion chromatograph after filtering.As can be seen from Figure 1, rebar surface can be made to have higher nitrite anions concentration by the way of smearing lithium nitrite mortar at concrete surface, and keep certain hour, thus effectively protect reinforcing bar.
Claims (1)
1. lithium nitrite mortar smears resistance rust method at reinforced concrete surface, it is characterized in that comprising following concrete steps:
(1), with steel bar corrosion instrument skeleton construction is tested, find out rusty part;
(2), with sander, the concrete structure of rusty part is polished off 5 ~ 10mm;
(3), lithium nitrite is deployed into lithium nitrite saturated aqueous solution;
(4), with lithium nitrite saturated aqueous solution soak buffed surface, make buffed surface form water membrane;
(5), by lithium nitrite and mortar carry out Homogeneous phase mixing, be deployed into lithium nitrite mortar, wherein in lithium nitrite and mortar, the mass ratio of cement is 2 ~ 2.5:100;
(6), by lithium nitrite mortar spread upon until equal with the concrete structure of periphery on buffed surface, after lithium nitrite mortar final set sclerosis, water seasoning under normal temperature environment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510528151.9A CN105130238A (en) | 2015-08-25 | 2015-08-25 | Method for smearing lithium nitrite mortar on surface of reinforced concrete to resist rust |
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| CN201510528151.9A CN105130238A (en) | 2015-08-25 | 2015-08-25 | Method for smearing lithium nitrite mortar on surface of reinforced concrete to resist rust |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85101466A (en) * | 1984-04-27 | 1987-01-24 | 小野田建材株式会社 | Be embedded in the corrosion inhibition method of the steel in the inorganic materials |
| CN1098352A (en) * | 1993-03-12 | 1995-02-08 | 格雷斯公司 | Be used to strengthen concrete anticorrosive composite and using method thereof |
| CN1151384A (en) * | 1995-07-19 | 1997-06-11 | 格雷斯公司 | Nitrite-based corrosion inhibitors with improved anodic and cathodic inhibiting performance |
| US20020066889A1 (en) * | 1998-05-13 | 2002-06-06 | Beat Marazzani | Method for rehabilitative and/or protective corrosion-inhibition of reinforcing steel embedded in a hardened structure by means of surface-applied corrosion-inhibiting compositions |
| CN103669230A (en) * | 2012-09-13 | 2014-03-26 | 上海法赫桥梁隧道养护工程技术有限公司 | Preventive maintenance method of concrete |
-
2015
- 2015-08-25 CN CN201510528151.9A patent/CN105130238A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85101466A (en) * | 1984-04-27 | 1987-01-24 | 小野田建材株式会社 | Be embedded in the corrosion inhibition method of the steel in the inorganic materials |
| CN1098352A (en) * | 1993-03-12 | 1995-02-08 | 格雷斯公司 | Be used to strengthen concrete anticorrosive composite and using method thereof |
| CN1151384A (en) * | 1995-07-19 | 1997-06-11 | 格雷斯公司 | Nitrite-based corrosion inhibitors with improved anodic and cathodic inhibiting performance |
| US20020066889A1 (en) * | 1998-05-13 | 2002-06-06 | Beat Marazzani | Method for rehabilitative and/or protective corrosion-inhibition of reinforcing steel embedded in a hardened structure by means of surface-applied corrosion-inhibiting compositions |
| CN103669230A (en) * | 2012-09-13 | 2014-03-26 | 上海法赫桥梁隧道养护工程技术有限公司 | Preventive maintenance method of concrete |
Non-Patent Citations (2)
| Title |
|---|
| 中国建筑学会混凝土外加剂应用技术专业委员会等: "《混凝土外加剂及其应用技术》", 31 August 2004, 机械工业出版社 * |
| 柳俊哲等: "亚硝酸盐在钢筋混凝土中的研究与进展", 《低温建筑技术》 * |
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Application publication date: 20151209 |