CN104359828A - Method for testing corrosive action of grouting mortar to rebar - Google Patents
Method for testing corrosive action of grouting mortar to rebar Download PDFInfo
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- CN104359828A CN104359828A CN201410603256.1A CN201410603256A CN104359828A CN 104359828 A CN104359828 A CN 104359828A CN 201410603256 A CN201410603256 A CN 201410603256A CN 104359828 A CN104359828 A CN 104359828A
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- reinforcing bar
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Abstract
The invention relates to the field of testing methods of building materials and discloses a method for testing corrosive action of grouting mortar to a rebar. The method mainly adopts a potentiostat and a testing die and comprises the following steps: manufacturing a rebar electrode, mixing fresh mortar, putting the mortar and the electrode into the testing die, connecting the potentiostat, testing and judging. According to a potential curve tested by the rebar electrode, the degree of oxidation of the rebar electrode is judged, so that the corrosion degree of the rebar electrode in the mortar is determined, and the situation that whether the grouting mortar corrodes the rebar is judged.
Description
Technical field
The present invention relates to a kind of method of testing field of building materials.
Background technology
Grout and mortar is widely used in the back-grouting of equipment Foundations, the grouting of steel structure column basis, the small gap bonding grouting such as track foundation, subway, tunnel, underground works backhander method construction joint build-in, foot bolt fastening, the reinforcing and repairing grouting of beams of concrete, post, plate, wall, other normal concretes are difficult to the irregular dead angle, corner and the reparation of concrete porosity supplementary irrigation etc. of pouring into a mould.
The composition of cement-based grout and mortar and concrete are similar to, roughly be made up of materials such as cement, admixture (flour filler), fine aggregate (fine aggregate), high efficiency water reducing agent, water-loss reducer, adjustable solidification agent, early strength agent, swelling agent and defoamers, require that there is higher early strength and later strength (compressive strength 1d >=22.0MPa, 3d >=40.0MPa, 28d >=70.0MPa).
In recent years, using phosphorus slag to add concrete research as admixture has a lot, but do not study and phosphorus slag is added in grout and mortar, applicant develops a kind of cement-based grout and mortar proportioning containing phosphorus slag, meets higher morning required by grout and mortar of strong problem while can overcoming the delayed coagulation of phosphorus slag.But the permanance of this cement-based grout and mortar is still not clear, need to measure it and be used for reflecting its permanance to steel bar corrosion, but prior art lacks corresponding maturation method.
Summary of the invention
The invention is intended to provide a kind of and measure the method for testing of grout and mortar to steel bar corrosion effect.
The invention discloses the method for testing of a kind of grout and mortar to steel bar corrosion effect, mainly use potentiostat, die trial, comprise the steps:
1) reinforcing bar electrode is made: the reinforcing bar producing standard length, and by reinforcing bar one end welding lead; Reinforcing bar two ends are immersed in coatings, makes to occur exposed length in the middle of its reinforcing bar, the reinforcing bar after process is put into exsiccator for subsequent use;
2) the fresh mortar of mixing
Fresh mortar comprises gel rubber material, adjuvant, water and sand, the mass ratio of water and gel rubber material and water-cement ratio are 0.26, the mass ratio of gel rubber material and sand and cement mortar rate are 1/1, gel rubber material is made up of Portland cement and phosphorus slag, the ratio of quality and the number of copies that Portland cement accounts for gel rubber material is 75 parts, and the ratio of quality and the number of copies that phosphorus slag accounts for gel rubber material is 25 parts; The ratio of quality and the number of copies that swelling agent accounts for gel rubber material is 6 parts, and the ratio of quality and the number of copies that poly carboxylic acid series water reducer accounts for gel rubber material is 1 part, and defoamer accounts for the ratio of quality and the number of copies 0.4 part of gel rubber material, and cellulose ether accounts for the massfraction of gel rubber material than 0.025 part;
3) mortar and electrode enter mould
Fresh mortar is poured in die trial, first waters the half to die trial.Two reinforcing bar electrode runs parallel are placed on mortar surface in die trial, pull-out wire, and then fill mortar;
4) potentiostat is connected
In step 3) an one reinforcing bar electrode is connected as anode with potentiostat anode input hole, another root reinforcing bar electrode is connected with potentiostat negative electrode input hole as negative electrode, the calomel access aperture of another increase by mercurous chloride electrode access potentiostat, the lower end of this mercurous chloride electrode is relative with the center position of anode reinforcing bar electrode;
5) test
First read the spontaneous potential of anode reinforcing bar during test, then connect additional power source and start timing, successively by 2 min, 4 min, 6 min, 8 min, 10 min, 15 min, 20 min, 25 min, 30 min, 60min, record anode polarization potential value respectively
6) judge
After energising, anode reinforcing bar current potential first rises to positive dirction, along with declining gradually again, illustrates that rebar surface passivating film is partially damaged; Anode reinforcing bar current potential first rises to positive dirction rapidly, and in 1min-5min, reach oxygen evolution potential value, and through 30min test, potential value, without obvious reduction, illustrates that anode rebar surface passivating film stands intact; After energising, anode reinforcing bar current potential always lower than zero, then illustrates that rebar surface Damage of Passive Film is serious.
The present invention is by imbedding in mortar to be measured by handle well two reinforcing bar electrodes, two ends due to reinforcing bar apply Insulation Material and wherein one end is welded with wire, by the anode input hole of the wire of reinforcing bar access potentiostat, the negative electrode input hole of the wire access potentiostat that another root is bold, measures the current potential of reinforcing bar by potentiostat.The final potential curve measured according to reinforcing bar electrode, judges the degree of oxidation of reinforcing bar electrode, thus determines the extent of corrosion of reinforcing bar electrode in mortar, thus judge whether place's grout and mortar has corrosion to reinforcing bar.
Further, the length, width and height of die trial are 400mm*100mm*150mm, and the length of described reinforcing bar electrode is 10cm, middle exposure segment length 8cm, then calculate the exposed area of reinforcing bar electrode according to the diameter of reinforcing bar electrode.
Accompanying drawing explanation
Fig. 1 is the potential-time curve schematic diagram of the embodiment of the present invention.
Embodiment
Below by embodiment, the present invention is further detailed explanation:
Grout and mortar, to the method for testing of steel bar corrosion effect, mainly uses potentiostat, die trial, and the length, width and height of die trial are 400mm*100mm*150mm, comprise the steps:
1) reinforcing bar electrode is made: produce the reinforcing bar that 10cm is long, and by reinforcing bar one end welding lead; Immersed in coatings at reinforcing bar two ends, make to occur exposed length in the middle of its reinforcing bar, middle exposure segment length 8cm, puts into exsiccator by the reinforcing bar after process for subsequent use;
2) the fresh mortar of mixing
Fresh mortar comprises gel rubber material, adjuvant, water and sand, the mass ratio of water and gel rubber material and water-cement ratio are 0.26, the mass ratio of gel rubber material and sand and cement mortar rate are 1/1, gel rubber material is made up of Portland cement and phosphorus slag, the ratio of quality and the number of copies that Portland cement accounts for gel rubber material is 75 parts, and the ratio of quality and the number of copies that phosphorus slag accounts for gel rubber material is 25 parts; The ratio of quality and the number of copies that swelling agent accounts for gel rubber material is 6 parts, and the ratio of quality and the number of copies that poly carboxylic acid series water reducer accounts for gel rubber material is 1 part, and defoamer accounts for the ratio of quality and the number of copies 0.4 part of gel rubber material, and cellulose ether accounts for the massfraction of gel rubber material than 0.025 part; 3) mortar and electrode enter mould
Fresh mortar is poured in die trial, first waters the half to die trial.Two reinforcing bar electrode runs parallel are placed on mortar surface in die trial, pull-out wire, and then fill mortar;
4) potentiostat is connected
In step 3) an one reinforcing bar electrode is connected as anode with potentiostat anode input hole, another root reinforcing bar electrode is connected with potentiostat negative electrode input hole as negative electrode, the calomel access aperture of another increase by mercurous chloride electrode access potentiostat, the lower end of this mercurous chloride electrode is relative with the center position of anode reinforcing bar electrode;
5) test
First read the spontaneous potential of anode reinforcing bar during test, then connect additional power source and start timing, successively by 2 min, 4 min, 6 min, 8 min, 10 min, 15 min, 20 min, 25 min, 30 min, 60min, record anode polarization potential value respectively
6) judge
After energising, anode reinforcing bar current potential first rises to positive dirction, along with declining gradually again, illustrates that rebar surface passivating film is partially damaged; Anode reinforcing bar current potential first rises to positive dirction rapidly, and in 1min-5min, reach oxygen evolution potential value, and through 30min test, potential value, without obvious reduction, illustrates that anode rebar surface passivating film stands intact; After energising, anode reinforcing bar current potential always lower than zero, then illustrates that rebar surface Damage of Passive Film is serious.
As shown in the potential-time curve of Fig. 1, after electrifying electrodes, anode reinforcing bar current potential is rapidly to positive dirction and rises, reach oxygen evolution potential value very soon, through 60min test, potential value, without obvious reduction, shows that anode rebar surface passivating film stands intact, to survey mortar to reinforcing bar be harmless, namely prepared grout and mortar does not have action of rust to reinforcing bar.
Above-described is only embodiments of the invention, and in scheme, the general knowledge such as known concrete structure and characteristic does not do too much description at this.Should be understood that; for a person skilled in the art, under the prerequisite not departing from structure of the present invention, some distortion and improvement can also be made; these also should be considered as protection scope of the present invention, and these all can not affect effect of the invention process and practical applicability.The protection domain that this application claims should be as the criterion with the content of its claim, and the embodiment in instructions etc. record the content that may be used for explaining claim.
Claims (2)
1. grout and mortar is to the method for testing of steel bar corrosion effect, mainly uses potentiostat, die trial, comprises the steps:
1) reinforcing bar electrode is made: the reinforcing bar producing standard length, and by reinforcing bar one end welding lead; Reinforcing bar two ends are immersed in coatings, makes to occur exposed length in the middle of its reinforcing bar, the reinforcing bar after process is put into exsiccator for subsequent use;
2) the fresh mortar of mixing
Fresh mortar comprises gel rubber material, adjuvant, water and sand, the mass ratio of water and gel rubber material and water-cement ratio are 0.26, the mass ratio of gel rubber material and sand and cement mortar rate are 1/1, gel rubber material is made up of Portland cement and phosphorus slag, the ratio of quality and the number of copies that Portland cement accounts for gel rubber material is 75 parts, and the ratio of quality and the number of copies that phosphorus slag accounts for gel rubber material is 25 parts; The ratio of quality and the number of copies that swelling agent accounts for gel rubber material is 6 parts, and the ratio of quality and the number of copies that poly carboxylic acid series water reducer accounts for gel rubber material is 1 part, and defoamer accounts for the ratio of quality and the number of copies 0.4 part of gel rubber material, and cellulose ether accounts for the massfraction of gel rubber material than 0.025 part;
3) mortar and electrode enter mould
Fresh mortar is poured in die trial, first waters the half to die trial, two reinforcing bar electrode runs parallel are placed on the mortar surface in die trial, pull-out wire, and then fill mortar;
4) potentiostat is connected
In step 3) an one reinforcing bar electrode is connected as anode with potentiostat anode input hole, another root reinforcing bar electrode is connected with potentiostat negative electrode input hole as negative electrode, the calomel access aperture of another increase by mercurous chloride electrode access potentiostat, the lower end of this mercurous chloride electrode is relative with the center position of anode reinforcing bar electrode;
5) test
First read the spontaneous potential of anode reinforcing bar during test, then connect additional power source and start timing, successively by 2 min, 4 min, 6 min, 8 min, 10 min, 15 min, 20 min, 25 min, 30 min, 60min, record anode polarization potential value respectively;
6) judge
After energising, anode reinforcing bar current potential first rises to positive dirction, along with declining gradually again, illustrates that rebar surface passivating film is partially damaged; Anode reinforcing bar current potential first rises to positive dirction rapidly, and in 1min-5min, reach oxygen evolution potential value, and through 30min test, potential value, without obvious reduction, illustrates that anode rebar surface passivating film stands intact; After energising, anode reinforcing bar current potential always lower than zero, then illustrates that rebar surface Damage of Passive Film is serious.
2. grout and mortar according to claim 1 is to the method for testing of steel bar corrosion effect, it is characterized in that: the length of described reinforcing bar electrode is 10cm, middle exposure segment length 8cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410603256.1A CN104359828A (en) | 2014-10-31 | 2014-10-31 | Method for testing corrosive action of grouting mortar to rebar |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410603256.1A CN104359828A (en) | 2014-10-31 | 2014-10-31 | Method for testing corrosive action of grouting mortar to rebar |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101607804A (en) * | 2009-02-18 | 2009-12-23 | 青岛理工大学 | Concrete corrosion-prevention rust-resistance penetration-resistant agent |
| JP2011220717A (en) * | 2010-04-05 | 2011-11-04 | Hiroshima Univ | Method of measuring polarization resistance, method of monitoring corrosion speed, and polarization resistance measuring device |
-
2014
- 2014-10-31 CN CN201410603256.1A patent/CN104359828A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101607804A (en) * | 2009-02-18 | 2009-12-23 | 青岛理工大学 | Concrete corrosion-prevention rust-resistance penetration-resistant agent |
| JP2011220717A (en) * | 2010-04-05 | 2011-11-04 | Hiroshima Univ | Method of measuring polarization resistance, method of monitoring corrosion speed, and polarization resistance measuring device |
Non-Patent Citations (4)
| Title |
|---|
| 周代军: "磷渣掺合料在水泥基灌浆材料中的应用研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 孙启华: "钢筋混凝土阻锈剂的研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑 》 * |
| 张琳: "论新拌砂浆法中检测外加剂对钢筋锈蚀的作用", 《材料保护》 * |
| 李永鑫: "含钢渣粉掺合料的水泥混凝土组成、结构与性能的研究", 《中国优秀博硕士学位论文全文数据库 (博士) 工程科技Ⅱ辑》 * |
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Application publication date: 20150218 |