CN101435816B - Anti-sulphates corrosive test method and test device of cement concrete - Google Patents
Anti-sulphates corrosive test method and test device of cement concrete Download PDFInfo
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- CN101435816B CN101435816B CN2008102333210A CN200810233321A CN101435816B CN 101435816 B CN101435816 B CN 101435816B CN 2008102333210 A CN2008102333210 A CN 2008102333210A CN 200810233321 A CN200810233321 A CN 200810233321A CN 101435816 B CN101435816 B CN 101435816B
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Abstract
The invention relates to a method for testing the sulphate erosion resistance of cement concrete and a device thereof. The method utilizes a principle of electroosmosis pulse technology, promotes the diffusion of sulphate ions to the inside of the cement concrete and rapidly detects the performance of sulphate erosion resistance of the cement concrete; and the capacity for resisting sulphate erosion of the cement concrete is judged according to the quality change and the strength loss value of the cement concrete. In the testing method, a concrete test piece is placed into a sulphate environment; and according to the condition of reaction between the sulphate ions and a hydration product of the concrete test piece under the action of pulse voltage, the performance of sulphate erosion resistance of the concrete is rapidly judged. The testing method has small testing strength and short period; the whole testing process is completed by only 7 days; and a testing result is rather accurate and can really reflect the situation of the concrete eroded in the sulphate environment.
Description
Technical field
The present invention relates to the building materials field tests, especially a kind of method of testing and proving installation of test water cement concrete anti-sulphates corrosive.
Background technology
Cement concrete is the structured material that consumption is maximum in the world, usable range is the widest.Cement concrete is subject to the chemical erosion of the objectionable constituent in air, underground water and the soil owing to inner structure and hydrated product, causes performances such as its intensity, cubic deformation and serviceable life to descend.In many chemical erosion types, sulphate corrosion is a key factor that influences concrete durability.The sulfate ion that all contains in soil, the underground water; Penetrate into inside concrete and react with the hydrated cementitious product; Produce concrete destructions such as expanding, ftracture, peel off, make structural concrete at the design service life that does not reach its expection with regard to too early destroying.Therefore, the concrete anti-sulphates corrosive method of testing that research and development are suitable is to guarantee concrete durability.
The test of current concrete sulfate resistance does not have standard method, as the sulfate resistance test of the cement of Binder Materials standard method is arranged.So the method for cement sulfate resistance test is used in the test of concrete sulfate resistance sometimes.China adopts following two kinds of methods to carry out the sulfate resistance test at present: a kind of is GB749-65 " cement resisting erosion of sulfate method of testing ", and another kind is GB2420-80 " a cement resisting erosion of sulfate method of testing (express method) ".GB749-65 adopts the little mortar specimen (cement-sand ratio is 1: 3.5) of 10mm * 10mm * 30mm, and GB2420-80 adopts the little mortar specimen (cement-sand ratio is 1: 3.5) of 10mm * 10mm * 60mm.Facts have proved, adopt this class methods test result discreteness very big.
In addition, the method for using always in the concrete research also has 80 ℃ of metabisulfite solution drying and watering cycle action methods.This method is concrete to be soaked a period of time (being generally 12 hours) in 80 ℃ of metabisulfite solutions, takes out the back and in 80 ℃ of baking ovens, dries, and soaks again, so circulates after 50 times, tests concrete loss of strength and mass loss.This method significant disadvantages is that tester's labour intensity is big, and key a bit is simultaneously, after 50 drying and watering cycles; Though concrete intensity has loss; But as far as some concrete, its not anti-reflection of quality increases, and can't reflect the situation that concrete is corroded in condition of sulfate really.Crucial is, even there is not condition of sulfate, the thermal shock effect that concrete drying and watering cycle causes under 80 ℃ of conditions also can cause concrete destruction, thereby is difficult to really judge concrete anti-sulphates corrosive ability.
In view of above method defective separately, be necessary to develop a kind of new anti-sulphates corrosive method.
Summary of the invention
To the above-mentioned deficiency that prior art exists, the purpose of this invention is to provide the method for testing that a kind of test result is directed against the cement concrete anti-sulphates corrosive comparatively accurately, easily and fast.
The objective of the invention is to realize like this: a kind of method of testing of cement concrete anti-sulphates corrosive; It is characterized in that; Utilize electric osmose pulse work principle; Promote sulfate ion to the inner diffusion of cement concrete, promote the reaction of sulfate ion and cement concrete hydrated product, fast detecting cement concrete anti-sulphates corrosive performance; Concrete anti-sulphates corrosive ability size changes with the loss of strength value with quality of concrete to be passed judgment on.
Method of testing of the present invention, concrete steps comprise:
1) setup test sample: the water intaking cement concrete is tested the cube that is shaped as of test specimen as the test test specimen;
2) the test test specimen removing surface of step 1) preparation is clean, take by weighing the initial mass of testing test specimen;
3) with step 2) test test specimen after handling places the suitable test box of the length of side middle part of width and test test specimen, and the test box space at test test specimen two ends is cut off, and an opposing sidewalls of test test specimen seals with the applying of test box inwall and by sealant; Two battery lead plates that will connect impulse voltage generator then respectively in advance are fixed on another opposing sidewalls of test test specimen; On the top of the two relative side of testing test specimen two partitions are installed respectively again, the vertical side of partitions seals with test outer, top, test specimen side respectively, and the partitions two ends seal respectively and between the test box inwall;
4) then, in the cavity at the test box two ends of separating, add sulfate liquor, keep the interior sulfate liquor liquid level of test anode tap case to be not less than the upper surface of test test specimen by the test test specimen;
5) power supply of make pulse voltage generator is tested again; Pulse voltage is 5-30V, and frequency is 5-30 second, test duration 7-10 days (test duration reduces and prolongation relatively with concrete water-cement ratio);
6) measure test result: test after accomplishing is taken off the concrete test test specimen, and surface treatment is clean, takes by weighing the quality after the test, and surveys the compressive strength of test test specimen;
7) test result is passed judgment on: with step 2) quality is compared after the test that obtains in the initial mass that takes by weighing and the step 6), calculates the mass change of concrete test test specimen test front and back; And will test the compressive strength of test specimen and compare with the compressive strength of the reference piece in maintenance under the standard curing condition to the identical length of time, calculating under the pulse voltage effect, sulfate liquor is to the reduction value of strength of concrete specimen; Concrete test test specimen anti-sulphates corrosive ability size changes with the loss of strength value with quality of concrete to be passed judgment on.
Compared with prior art, the present invention has following advantage:
(1) this method of testing places condition of sulfate with the concrete test test specimen, under the pulse voltage effect, with the response situation of concrete sample hydrated product, judges concrete anti-sulphates corrosive performance fast according to sulfate ion;
(2) this method of testing test intensity is little, and the cycle is short; Whole test process only needed to accomplish in 7-10 days, and test result is also more accurate, can reflect the situation that concrete is corroded in condition of sulfate really.
Description of drawings
Fig. 1 is the proving installation structural representation (overlooking) that adopts cement concrete anti-sulphates corrosive method of testing of the present invention;
Fig. 2 is the proving installation structural representation (main looking) that adopts cement concrete anti-sulphates corrosive method of testing of the present invention;
Fig. 3 is that institute adds pulse voltage waveform figure in the cement concrete anti-sulphates corrosive method of testing test of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is done further detailed description.
The method of testing of the cement concrete anti-sulphates corrosive that the present invention relates to; Be to utilize electric osmose pulse work principle; Promote sulfate ion to the cement concrete internal divergence; Promote the reaction with the cement concrete hydrated product, thereby reach the purpose of fast detecting cement concrete anti-sulphates corrosive ability.Concrete steps are following:
Step 1: prepare cement concrete test test specimen.It is the specimen of the special preparation of test that the cement concrete test test specimen that adopts in this test can be taked prior art, also directly the concrete after using sampling as testing test specimen.The method for preparing specimen: with concrete depositing in concrete mold, concrete mix vibratory compaction; After the demoulding, maintenance is to be measured to stipulating after the length of time on request.The concrete test test specimen that uses in this method of testing adopts cube specimen, is of a size of 100mm * 100mm * 100mm or 150mm * 150mm * 150mm and all can; If will test concrete rupture strength variation etc. in metabisulfite solution, sample dimensions can adopt 100mm * 100mm * 400mm or 150mm * 10mm * 500mm.
Step 2: it is clean that cement concrete is tested the test specimen removing surface, takes by weighing initial mass.
Step 3: fixing test test specimen.Referring to Fig. 1 and Fig. 2, with step 2) the test test specimen 3 after handling is fixed in the center of test box 5, and arbitrary opposing sidewalls of test test specimen 3 is fitted with the inwall of test box 5 respectively, and adopts paraffin or vaseline to seal; Another opposing sidewalls installing electrodes plate 4, two battery lead plates 4 respectively links to each other with anode with the negative electrode of impulse voltage generator 2 respectively; Test test specimen 3 tops isolate with partitions 7, seal between partitions, test specimen and test box inwall.
Wherein, the height of test box 5 highly slightly exceeds about 30mm than concrete test test specimen 3 like test box 5 slightly than concrete test test specimen 3 height, and purpose is to be beneficial to test operation, makes the metabisulfite solution liquid level be not less than test test specimen end face again.Test test specimen 3 is divided into the cavity of two isolation with test box 5, and is easy for installation for guaranteeing test specimen sealing, battery lead plate, and the bulk of test box two ends cavity is not less than the size of test specimen.Test box 5 can be made up of three test storehouses, also can have only a test storehouse, and the size in each test storehouse is confirmed according to the concrete sample size; Concrete sample places the centre in test storehouse, and the bulk of each end of test storehouse is not less than sample dimensions.Battery lead plate can be adopted galvanized sheet iron or stainless steel substrates etc., and the battery lead plate size should be slightly less than the test specimen face size, and battery lead plate can not damage the test specimen surface fixedly the time.
Step 4: in the test box cavity at concrete test test specimen 3 two ends, add metabisulfite solution 1, the concentration of metabisulfite solution is saturated getting final product.The metabisulfite solution liquid level is not less than test test specimen end face; The metabisulfite solution at concrete sample 3 two ends in the test box is because the effect of test specimen and baffle plate separates fully.
Step 5: the power supply of make pulse generator 2, test.The pulse voltage of pulse producer 2 is 5-30V, and frequency is 5-30 second (pulse waveform is referring to accompanying drawing 3), minimum seven days of whole test duration.When adopting low water binder ratio, the test duration can prolong accordingly.Need to prove that in whole test process, the sulfate liquor liquid level in the holding anode end test box is not less than test test specimen end face; In the process of energized, the sulfate ion in the anode tap metabisulfite solution can quicken diffusion in concrete sample, and reacts with hydrated product in the concrete sample, to reach the purpose of quick simulating nature corrosion concrete process; In the test process, the ion in the anode tap solution of test box can flow to the cathode terminal of test box, and the top of test box cathode terminal is provided with spillway, and the spillway position is not less than the test specimen height, and a gathering-device 6 is installed is collected the liquid that overflows.
Step 6: test result is passed judgment on.After test is accomplished, the concrete test test specimen is taken off, surperficial wiped clean takes by weighing the quality of test, and the compressive strength of test concrete test test specimen, and the method for testing of concrete crushing strength adopts prior art.
Calculate the mass change of concrete test front and back; And will test the compressive strength of test specimen and compare with the concrete reference piece intensity in maintenance under the standard curing condition to the identical length of time; Calculate under the pulse voltage effect; Sulfate liquor is to the reduction value of concrete strength, and concrete anti-sulphates corrosive ability size changes with the loss of strength value with quality of concrete to be passed judgment on.
In order to realize above-mentioned method of testing, as depicted in figs. 1 and 2, the proving installation that the present invention adopts is made up of test box 5 and impulse voltage generator 2, and the negative electrode of impulse voltage generator 2 is connected two battery lead plates 4 through lead respectively with anode.When test is prepared, concrete test test specimen 3 is fixed in test box 5 middle parts, wherein two relative sidewalls are fitted with the tank wall of test box 5 respectively and are sealed by filling agent, and test box 5 is divided into two cavitys that do not communicate; Again said battery lead plate 4 is individually fixed on other two walls of concrete test test specimen 3.The two ends, top of concrete test test specimen 3 are provided with and isolate plate washer 7, and the height of partitions 7 positions is suitable with the height of test box 5, and partitions 7 seals respectively with the tank wall of testing test specimen 3 and test box 5; After test preliminary work is accomplished, metabisulfite solution is joined in the cavity at test box 5 two ends, the power supply of make pulse generator, this moment, the sulfate ion of anode tap can quicken to be immersed in the concrete sample 3, and with concrete sample 3 in the hydrated product reaction; In the test process; Ionic liquid in the anode tap solution of test box flows to the cathode terminal of test box; The solution of cathode terminal increases gradually; The top of test box cathode terminal is provided with spillway, and the spillway position is not less than the height of test test specimen 3, and a fluid collection device 6 is installed is collected the solution that overflows; Test after 7-10 days, take out concrete test test specimen 3.
In the method for testing of the present invention, the concentration of the metabisulfite solution that is adopted, and the pulse voltage that applies and frequency all exert an influence to the time of test.When reach capacity concentration, pulse voltage 5-30V and frequency of sulfuric acid solution concentration is 5-30 during second, test after seven days, just can reach desirable test effect; Otherwise when if lower, pulse voltage of metabisulfite solution concentration and frequency are low, the test duration needs to prolong relatively, but also can reach desirable test effect.
Claims (6)
1. the method for testing of a cement concrete anti-sulphates corrosive; It is characterized in that; Utilize electric osmose pulse work principle; Promote sulfate ion to the inner diffusion of cement concrete, promote the reaction of sulfate ion and cement concrete hydrated product, fast detecting cement concrete anti-sulphates corrosive performance; Concrete anti-sulphates corrosive ability size changes with the loss of strength value with quality of concrete to be passed judgment on;
Concrete steps comprise:
1) setup test sample: the water intaking cement concrete is tested the cube that is shaped as of test specimen as the test test specimen;
2) the test test specimen removing surface of step 1) preparation is clean, take by weighing the initial mass of testing test specimen;
3) with step 2) test test specimen after handling places the width test box middle part suitable with the length of side of test test specimen, and the test box space at test test specimen two ends is cut off, and an opposing sidewalls of test test specimen seals with the applying of test box inwall and by sealant; Two battery lead plates that will connect impulse voltage generator then respectively in advance are fixed on another opposing sidewalls of test test specimen; On the top of the two opposite side walls of testing test specimen two partitions are installed respectively again, the vertical side of partitions seals with test outer, test specimen sidewall top respectively, and the partitions two ends seal respectively and between the test box inwall;
4) then, in the cavity at the test box two ends of separating, add sulfate liquor, keep the interior sulfate liquor liquid level of test anode tap case to be not less than the upper surface of test test specimen by the test test specimen;
5) power supply of make pulse voltage generator is tested again; Pulse voltage is 5-30V, and frequency is 5-30 second, test duration 7-10 days;
6) measure test result: test after accomplishing is taken off the concrete test test specimen, and surface treatment is clean, takes by weighing the quality after the test, and the compressive strength of test test test specimen;
7) test result is passed judgment on: with step 2) quality is compared after the test that obtains in the initial mass that takes by weighing and the step 6), calculates the mass change of concrete test front and back; And will test the compressive strength of test specimen and compare with the compressive strength of the reference piece in maintenance under the standard curing condition to the identical length of time, calculating under the pulse voltage effect, sulfate liquor is to the reduction value of strength of concrete specimen; Concrete anti-sulphates corrosive ability size changes with the loss of strength value with quality of concrete to be passed judgment on.
2. the method for testing of cement concrete anti-sulphates corrosive according to claim 1 is characterized in that, the test test specimen in the said step 1) is of a size of 100mm * 100mm * 100mm or 150mm * 150mm * 150mm.
3. the method for testing of cement concrete anti-sulphates corrosive according to claim 1 is characterized in that, the battery lead plate in the said step 3) is shaped as square, and undersized is in the size of test test specimen side, and battery lead plate is galvanized sheet iron or stainless steel substrates.
4. the method for testing of cement concrete anti-sulphates corrosive according to claim 1 is characterized in that, said sulfate liquor is a metabisulfite solution, and sulfate concentration is a saturated solution.
5. realize the cement concrete anti-sulphates corrosive proving installation of the said method of testing of claim 1; It is characterized in that; Mainly comprise test box (5) and impulse voltage generator (2), the negative electrode of impulse voltage generator (2) is connected two battery lead plates (4) through lead respectively with anode; Test box (5) is a rectangular vessel, and the ratio of length is 3: 1: 1.3;
Comprise that also two intercept plate washer (7), partitions (7) is used for the upper surface of test test specimen (3) is isolated.
6. cement concrete anti-sulphates corrosive proving installation according to claim 5 is characterized in that, is provided with spillway on the top of test box cathode terminal, and the spillway position is not less than the height of test test specimen, and is communicated with fluid collection device (6).
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| CN101435816B true CN101435816B (en) | 2012-02-29 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101620217B (en) * | 2009-08-07 | 2012-12-19 | 武汉理工大学 | Device for controlling concentration of erosion solution in concrete durability experiment |
| CN102288539B (en) * | 2011-07-26 | 2013-09-25 | 重庆大学 | Cement concrete anti-thaumasite form of sulfate attack (TSA) erosion acceleration test device and method |
| CN103630487A (en) * | 2012-08-27 | 2014-03-12 | 中国科学院金属研究所 | Accelerated corrosion test device for nonferrous metal soil |
| CN103821382B (en) * | 2014-01-16 | 2016-03-16 | 河海大学 | A kind of electric osmose of rehabilitating concrete structure chlorine salt corrosion substitutes hole solution method |
| CN104614306B (en) * | 2015-02-04 | 2017-02-22 | 中电建路桥集团有限公司 | Method for testing corrosion effect of gyprock on concrete under action of multiple factors |
| CN104634726B (en) * | 2015-02-04 | 2017-03-29 | 中电建路桥集团有限公司 | Experimental rig of the selenolite to concrete erosion effect under multifactor effect |
| CN106404647A (en) * | 2016-08-30 | 2017-02-15 | 中国建筑材料科学研究总院 | Method and device for measuring sea water erosion resistance of cement-based material |
| CN106841697B (en) * | 2017-01-05 | 2019-06-25 | 厦门理工学院 | A kind of monoblock type cement-based material ac impedance measurement fixture |
| CN107621439A (en) * | 2017-09-21 | 2018-01-23 | 吴腾飞 | A kind of concrete electric permeates erosion-resisting method |
| CN108801894A (en) * | 2018-07-19 | 2018-11-13 | 河海大学 | A kind of sulfate physical erosion acceleration test apparatus and test method |
| CN110426459A (en) * | 2019-08-15 | 2019-11-08 | 朱小明 | A kind of tunnel lining concrete testing methods of sulfate-attack resistance |
| CN110501274B (en) * | 2019-08-28 | 2022-02-11 | 重庆大学 | Device for testing permeability of chloride ions at reinforcing steel bar-concrete interface and testing method based on device |
| CN111747505B (en) * | 2020-06-19 | 2022-03-11 | 轻工业环境保护研究所 | Embedded sulfate corrosion monitoring and self-repairing multifunctional micro-balloon |
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| JP2003149222A (en) * | 2001-11-09 | 2003-05-21 | Sumitomo Metal Mining Co Ltd | Quantitative determination method for sulfur trioxide |
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