CN102564916A - Fast load testing device and method for chloride ion migration coefficient of concrete - Google Patents
Fast load testing device and method for chloride ion migration coefficient of concrete Download PDFInfo
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- CN102564916A CN102564916A CN2012100130773A CN201210013077A CN102564916A CN 102564916 A CN102564916 A CN 102564916A CN 2012100130773 A CN2012100130773 A CN 2012100130773A CN 201210013077 A CN201210013077 A CN 201210013077A CN 102564916 A CN102564916 A CN 102564916A
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Abstract
The invention discloses a fast load testing device and method for a chloride ion migration coefficient of concrete. An elastic connecting piece in a state of compression is adopted for exerting a sustained load on a concrete sample and the concrete sample loaded with sustained stress is subjected to an electric accelerating chloride ion migration test to calculate the chloride ion migration coefficient of the concrete sample in the state. According to the invention, the fast load testing device and method for the chloride ion migration coefficient of the concrete aim at the problems that the conventional testing device for the chloride ion migration of the concrete can not exert a load on a tested sample and consequently can neither imitate the actual loaded state of in-service concrete nor determine the chloride ion migration coefficient of the concrete under sustained load; sustained and stable pressure is exerted on the concrete sample in longitudinal direction by the resilience of the elastic connecting piece; and the reduction of pressure stress caused by the creep of the concrete sample when a tensioning screw is used for exerting load can be avoided, so that the influence of the sustained load on the permeability of the chloride ions of the concrete can be researched.
Description
Technical field
The present invention relates to a kind of proving installation and method of measuring the concrete chloride ion transport coefficient, specifically relate to a kind of in the device for quick testing and the method that continue to press concrete chloride ion transport coefficient under the loading condition.
Background technology
Steel bar corrosion is one of main failure mode of all kinds of reinforced concrete structures.The one of the main reasons that causes the reinforced concrete structure steel bar corrosion is the intrusion of chlorion, and therefore concrete chloride ion permeability is that reinforced concrete is in the important symbol of chloride content than high ambient (like oceanographic engineering, underground works and some water conservancy project structures) permanance.People study the assay method of concrete chloride ion permeability for many years, have worked out relevant testing regulations.Electric flux method that mainly contains that adopts at present and chlorion transfer method fast, but tested test specimen does not relate to the effect of load in two kinds of methods.Yet actual in commission concrete; Not only standing hydraulic pressure, chlorine ion concentration difference etc. influences the effect of the extraneous factor of chloride permeability; Nearly all concrete works all can bear the effect of dissimilar loads, the most vertical pressure load of its top structures wherein, and load tends to influence the generation and the expansion of microfracture in the concrete; Influence concrete perviousness, comprise chloride ion permeability.Present many countries adopt electric flux method and quick chlorion transport coefficient method (being called for short the RCM method) to estimate concrete opposing chloride permeability ability.The electric flux method is the DC voltage that the concrete sample two ends that are used in Φ 95 * 50 mm apply 60 V, through detecting the electric flux size that flows through in 6 h, divides the permeability of concrete chloride ions grade qualitatively; Chlorion transport coefficient method is the DC voltage that applies 10 V-60 V at Φ 100 * 50 mm concrete sample two ends fast; Through the average length of penetration of chlorion in test specimen behind the mensuration inspection energising 6h-96h; Calculate concrete chlorion transport coefficient thus, the concrete perviousness of quantitative evaluation.The used test specimen shape of these two kinds of methods, apparatus and method are not all considered, can't be realized tested test specimen is applied the pressure load simultaneously yet.For the mensuration of pressing permeability of concrete chloride ions under the load; ZL 2,009 1 0212680.2 provides a kind of electricity consumption flux method test to bear simultaneously vertically and lateral pressure is the charger and the method for testing of permeability of concrete chloride ions; But this device is through being drawn screw rod to keep the pressure to test specimen after concrete test block is loaded on the one hand; (like 96 h time) are because creeping of concrete test block and build-up of pressure reduces must repeatedly be adjusted clamp nut to keep pressure stable in test process when the test duration is longer; The electric flux method can not draw concrete chlorion transport coefficient on the other hand, only can obtain result qualitatively.ZL 2,009 1 0184937.8 provides charger and the method for testing of a kind of electricity consumption flux method test concrete at bending load effect permeability of concrete chloride ions, is through being drawn screw rod to keep the loading force to test specimen equally; Patent CN 102042949 A have announced a kind of testing permeability of concrete chloride ions stretching device and application thereof in the bulletin; Rebound effect through spring continues tensile load to test specimen; But this device can not provide the pressure load, and the method for testing that provides also is merely the electric flux method.Therefore, owing to receive the restriction of conventional test device, the proving installation and the method for the quick chlorion transport coefficient of concrete under the pressurized loading condition is still blank.
Summary of the invention
The proving installation that the present invention is directed to the quick chlorion transport coefficient of conventional concrete can not provide the loading and the proving installation of the quick chlorion transport coefficient test of concrete under a kind of lasting pressure loading condition to the problem of test specimen loading.
For realizing above technical purpose, the present invention will take following technical scheme:
The quick chlorion transport coefficient of a kind of concrete loading test device, this device comprise that compression-loaded device and electricity quicken chlorion fast transferring device; Wherein: said compression-loaded device comprises testing jig and linear drive apparatus; Testing jig comprises base, guide frame, presses down steel plate, goes up compression steel plate, and presses down between steel plate and the base Flexible Connector is set; One end and the base of guide frame are fixed, and the other end of guide frame passes successively and presses down steel plate, goes up compression steel plate and place, and press down steel plate, go up compression steel plate all with guide frame activity setting, the clutch end of linear drive apparatus is towards last compression steel plate setting; The lower surface of last compression steel plate is installed force cell; The signal output part of this force cell is connected with the measuring appliance instrument; And the upper surface that presses down steel plate is provided for putting the test specimen accepting area of concrete sample, said force cell, test specimen accepting area, base, press down steel plate, the center of going up compression steel plate is in same straight line; Said electricity quickens chlorion fast transferring device, comprises test trough and D.C. regulated power supply; The test trough split is set to cathode test groove, anode test trough, and D.C. regulated power supply disposes the display device that can show D.C. regulated power supply output voltage, electric current simultaneously; Concrete sample is clamped between cathode test groove, the anode test trough through threaded fastener, and cathode test groove, anode test trough respectively with the negative pole of D.C. regulated power supply, anodal corresponding connection, while cathode test groove splendid attire contains Cl
-Salt solusion.
Said guide frame comprises the screw rod more than two; Each screw rod be distributed in base around; And an end and the whorl of base of each root screw rod are fixed; The other end of each root screw rod then passes successively and press down steel plate, go up compression steel plate places, simultaneously each root screw rod all with press down steel plate, go up activity setting between the compression steel plate.
Two surfaces up and down of last compression steel plate are respectively arranged with upper limit set nut and following support nut, and said upper limit set nut all is connected with screw flight with following support nut.
Said linear drive apparatus is a hydraulic jack; Said top of going up compression steel plate also is provided with top board, and said top board and guide frame are fixed, and hydraulic jack is placed between compression steel plate and the top board simultaneously.
Said Flexible Connector is a spring, and each the root screw rod body of rod periphery that presses down between steel plate and the base all is socketed with spring, the two ends of this spring respectively with base with to press down steel plate inconsistent.
The test specimen accepting area comprises and is upper padding plate and the lower bolster that stacks up and down that concrete sample places between upper padding plate and the lower bolster, and between force cell and the upper padding plate ball seat is set.
Concrete sample is a cube specimen, and the initial chloride permeability face of test specimen be the square, the surface of contact that the initial chloride permeability face of this test specimen is concrete sample and cathode test groove.
The cavity of cathode test groove, anode test trough is rectangular parallelepiped.
The method of testing of the quick chlorion transport coefficient of a kind of above-mentioned concrete loading test device is characterized in that, may further comprise the steps:
| Initial current value during initial voltage (mA) | <15 | 15~20 | 20-30 | 30-40 | 40-60 | 60-90 | 90-120 | 120-180 | ≥180-360 |
| Adjustment voltage (V) | 1.2L | 1.0L | 0.8L | 0.7L | 0.6L | 0.5L | 0.4L | 0.3L | 0.2L |
Table 1
| Apply the adjustment voltage after institute's corresponding current value (mA) | <10 | 10-20 | 20-120 | >;120 |
| Duration of test runs (h) | 98 | 48 | 24 | 6 |
Table 2
Adjustedly apply the respective electrical flow valuve that voltage obtains according to this, set duration of test runs according to table 2;
In the formula:
D---concrete unstable state chlorion transport coefficient, unit is 10
-12m
2/ s;
V---applied voltage, unit are V;
T---the initial temperature of anodic dissolution and the mean value of end temp, unit are ℃;
L---test specimen interpolar thickness, unit are mm;
X d ---chloride permeability depth-averaged value, unit is mm;
t---duration of test runs, unit is h.
According to above technical scheme, with respect to prior art, the present invention has following beneficial effect:
1, having solved conventional concrete chloride ion transport coefficient proving installation can not load test specimen, therefore can not simulate at labour concrete real load state, can't measure the problem that continues to press concrete chloride ion transport coefficient under the loading condition.
2, adopt Flexible Connector as the loading source; The bounce of utilizing spring vertically applies continual and steady pressure to concrete sample; Can avoid using when being drawn screw rod to load because creeping of concrete sample causes compressive stress to reduce; Continue to press the influence of loading condition thereby can study to permeability of concrete chloride ions; Estimate the chloride-penetration resistance ability of concrete under the pressurized loading condition, its achievement in research is if be applied to actual engineering, and the assessment that can be design, reinforcing and the Years Of Service of xoncrete structure provides foundation.
3, apparatus structure is simple, and is easy to operate, presses load stable in the test process, can show in real time that test result is reliable and stable.
Description of drawings
Fig. 1 is the synoptic diagram that the quick chlorion transport coefficient of the concrete proving installation of concrete sample is housed;
Fig. 2 is the synoptic diagram that the quick chlorion transport coefficient of the concrete loading device for testing of concrete sample is housed;
Fig. 3 is the A-A sectional view of Fig. 1 and Fig. 2;
Fig. 4 is the structural representation of test flume;
Fig. 5 is the B-B cut-open view of Fig. 4;
Reference numeral: 1, base; 2, screw rod; 3, spring location cylinder; 4, Flexible Connector; 5, press down steel plate; 6, lower bolster; 7, upper padding plate; 8, ball seat; 91, force cell; 92, dynamometer instrument; 10, following support nut; 11, go up compression steel plate; 12, upper limit set nut; 13, hydraulic jack; 14, top board support nuts; 15, top board; 16, top board fastening bolt cap; 17, concrete sample; 18, anode test flume; 181, anode test flume cell body; 182, anode test flume copper mesh sheet; 183, anode test flume rubber seal; 19, test flume tackbolt; 20, D.C. regulated power supply.
Embodiment
Accompanying drawing discloses the structural representation of preferred embodiment involved in the present invention without limitation; Below will combine accompanying drawing that technical scheme of the present invention at length is described.
Shown in Fig. 1 to 5; The quick chlorion transport coefficient of concrete according to the invention loading test device comprises that compression-loaded device and electricity quicken chlorion fast transferring device, wherein the compression-loaded device by steel sole plate 1, screw rod 2, spring location cylinder 3, Flexible Connector 4, press down steel plate 5, lower bolster 6, upper padding plate 7, ball seat 8, force cell 91, dynamometer instrument 92, down support nut 10, go up compression steel plate 11, upper limit set nut 12, hydraulic jack 13, top board support nuts 14, top board 15 and top board fastening bolt cap 16 and constitute;
Steel sole plate 1, press down steel plate 5, go up the square that compression steel plate 11 and top board 15 are length of side 500mm, thickness is 30mm.
Respectively there is a M34 screw near the 55mm place that is from both sides of four drift angles of steel sole plate 1, and respectively there is a φ 38mm circular hole near the 55mm place that is from both sides of four drift angles that presses down steel plate 5, last compression steel plate 11 and top board 15; Four drift angles above the steel sole plate 1 are neighbouring to be the 30mm place external diameter is respectively arranged is 200mm from both sides, wall thickness is that the spring of 5mm, high 250 mm is located cylinder 3.
The Flexible Connector 4 of four high 500mm, elasticity coefficient 500N/mm is enclosed within respectively on four spring location cylinders 3; With four long 1200mm; The screw rod 2 of M34 is screwed into four screws of steel sole plate 1, screw rod 2 is passed respectively press down steel plate 5, following support nut 10, goes up compression steel plate 11, upper limit set nut 12, top board support nuts 14, top board 15 and top board fastening bolt cap 16; To place lower bolster 6, upper padding plate 7, ball seat 8, maximum range successively be the force cell 91 of 400kN pressing down on the steel plate 5 middle, and 400kN hydraulic jack 13 is placed in the position, middle on last compression steel plate 11.
Two test flumes 18 that electricity is quickened chlorion fast transferring device are installed on the relative side of concrete sample two respectively; Connect with test flume tackbolt 19; With the positive pole of D.C. regulated power supply 20 and negative pole respectively with two test flumes 18 in copper mesh sheet 182 be connected, just can stablize under the press loading effect the quick chlorion transport coefficient of concrete and measure by setting program.
In the said apparatus, Flexible Connector can be selected spring, also can not select, and in addition, for Flexible Connector is well located, can the screw rod end near base of the present invention be provided with spring location cylinder; For hydraulic jack, can adopt other reciprocal linear moving apparatus such as linear electric motors, cylinder to substitute; The present invention can not adopt screw rod, and only need adopt guidepost to get final product, because the fundamental purpose of screw rod also is in order to lead; In addition, support nut down of the present invention is unnecessary parts, has adopted the just assembling of whole device for ease of time support nut.
Based on above-mentioned loading test device, the quick chlorion transport coefficient loading of concrete according to the invention method of testing is following:
With PO 42.5 class g cements; Artificial rubble of the ls that modulus of fineness is 2.6 river sand, maximum particle diameter is 20 mm and tap water are by the concrete batching of match ratio shown in the table 1; Be molded into the cube concrete sample of 100 mm * 100 mm * 100 mm, 18 test specimens of each proportioning.Test specimen is got the reference of 3 sizes of loading when measuring compressive strength and carrying out the chloride ion permeability test as all the other test specimens in the test specimen of each proportioning behind concrete standard fog room maintenance 28 d.Each is organized the compressive strength of test specimen and sees table 3.
Table 3 concrete mix and test specimen compressive strength
Each proportioning is divided into 6 groups, pushes load level and is respectively 0,20%, 40%, 60%, 80% load mode mensuration, measures 3 test specimens for every group.
Table 4 is respectively organized the test specimen test procedure
In the formula:
D---concrete unstable state chlorion transport coefficient, (* 10
-12m
2/ s);
U---applied voltage (V);
T---the initial temperature of anodic dissolution and the mean value of end temp (℃);
X d ---chloride permeability depth-averaged value (mm);
t---duration of test runs (h).
Getting the mean values of 3 test specimen chlorions migration system on the same group, is to estimate the resistance of chloride ion penetration of concrete under this loaded state as the chlorion migration of this group test specimen.
Concrete for hydraulic structure chlorion transport coefficient is measured the result under the different pressure of table 5 loading condition
Can find out from test findings:
(1) can effectively carry out the mensuration of the quick chlorion transport coefficient of concrete under the different ballast conditions with embodiment 1 said device.
(2) two kinds of concrete that intensity is different are pressing the chlorion transport coefficient under the load all to demonstrate identical Changing Pattern.When the loading level was low, along with the increase of the level of loading, concrete chlorion transport coefficient slightly reduced but changes less; It is bigger that loading level chlorion transport coefficient between 40%-60% reduces amplitude.This is owing to be lower than at 80% o'clock in the loading level, presses load very little for the destruction of concrete sample, has the effect with test specimen " densification is real " on the contrary, makes primary micro-crack closure in the test specimen, thereby reduces concrete chloride ion permeability.When the loading level reaches 80%, the chlorion transport coefficient of test specimen increases, and this is that bigger lateral deformation has taken place test specimen owing to reach at 80% o'clock in the loading level, and load has caused the formation and the expansion of micro-crack, and concrete chloride ion permeability is increased.
Claims (9)
1. the quick chlorion transport coefficient of a concrete loading test device is characterized in that, this device comprises that compression-loaded device and electricity quicken chlorion fast transferring device; Wherein:
Said compression-loaded device comprises testing jig and linear drive apparatus; Testing jig comprises base, guide frame, presses down steel plate, goes up compression steel plate, and presses down between steel plate and the base Flexible Connector is set; One end and the base of guide frame are fixed, and the other end of guide frame passes successively and presses down steel plate, goes up compression steel plate and place, and press down steel plate, go up compression steel plate all with guide frame activity setting, the clutch end of linear drive apparatus is towards last compression steel plate setting; The lower surface of last compression steel plate is installed force cell; The signal output part of this force cell is connected with the measuring appliance instrument; And the upper surface that presses down steel plate is provided for putting the test specimen accepting area of concrete sample, said force cell, test specimen accepting area, base, press down steel plate, the center of going up compression steel plate is in same straight line;
Said electricity quickens chlorion fast transferring device, comprises test trough and D.C. regulated power supply; The test trough split is set to cathode test groove, anode test trough, and D.C. regulated power supply disposes the display device that can show D.C. regulated power supply output voltage, electric current simultaneously; Concrete sample is clamped between cathode test groove, the anode test trough through threaded fastener, and cathode test groove, anode test trough respectively with the negative pole of D.C. regulated power supply, anodal corresponding connection, while cathode test groove splendid attire contains Cl
-Salt solusion.
2. the quick chlorion transport coefficient of concrete according to claim 1 loading test device; It is characterized in that; Said guide frame comprises the screw rod more than two, each screw rod be distributed in base around, and an end and the whorl of base of each root screw rod are fixed; The other end of each root screw rod then passes successively and press down steel plate, go up compression steel plate places, simultaneously each root screw rod all with press down steel plate, go up activity setting between the compression steel plate.
3. the quick chlorion transport coefficient of concrete according to claim 2 loading test device; It is characterized in that; Two surfaces up and down of last compression steel plate are respectively arranged with upper limit set nut and following support nut, and said upper limit set nut all is connected with screw flight with following support nut.
4. the quick chlorion transport coefficient of concrete according to claim 3 loading test device is characterized in that said linear drive apparatus is a hydraulic jack; Said top of going up compression steel plate also is provided with top board, and said top board and guide frame are fixed, and hydraulic jack is placed between compression steel plate and the top board simultaneously.
5. the quick chlorion transport coefficient of concrete according to claim 4 loading test device; It is characterized in that; Said Flexible Connector is a spring; Each the root screw rod body of rod periphery that presses down between steel plate and the base all is socketed with spring, the two ends of this spring respectively with base with to press down steel plate inconsistent.
6. the quick chlorion transport coefficient of concrete according to claim 5 loading test device; It is characterized in that; The test specimen accepting area comprises and is upper padding plate and the lower bolster that stacks up and down that concrete sample places between upper padding plate and the lower bolster, and between force cell and the upper padding plate ball seat is set.
7. the quick chlorion transport coefficient of concrete according to claim 6 loading test device; It is characterized in that; Concrete sample is a cube specimen, and the initial chloride permeability face of test specimen be the square, the surface of contact that the initial chloride permeability face of this test specimen is concrete sample and cathode test groove.
8. the quick chlorion transport coefficient of concrete according to claim 1 loading test device is characterized in that the cavity of cathode test groove, anode test trough is rectangular parallelepiped.
9. the method for testing of the quick chlorion transport coefficient of the said concrete of claim 7 loading test device is characterized in that, may further comprise the steps:
Step 1, concrete sample to be measured (17) is positioned in the middle of lower bolster (6) and the upper padding plate (7), unclamps support nut (10) down; With hydraulic jack (13) last compression steel plate (11) is exerted pressure; Pressure is applied on the concrete sample (17) through last compression steel plate (11), force cell (91), ball seat (8), upper padding plate (7), and by concrete sample (17) through pressing down backing plate (6), pressing down steel plate (5) pressure is continued to be applied on the Flexible Connector (4); When dynamometer instrument (92) display setting force value, tighten upper limit set nut (12);
Step 2, cathode test groove, anode test trough be seal-installed on the two relative side of concrete sample (17) respectively through test flume fastening bolt (19); In anode test trough, cathode test groove, inject NaOH solution and NaCl solution then respectively;
Step 3, open D.C. regulated power supply; According to the interpolar thickness L/mm of concrete sample (17) between cathode test groove, anode test trough; The initial voltage of regulating D.C. regulated power supply lies prostrate to 0.6L/, determines the initial current through concrete sample then; Then according to measured initial current value, according to table 1 adjustment D.C. regulated power supply voltage that applies to concrete sample in follow-up test;
Table 1
Table 2
Adjustedly apply the respective electrical flow valuve of passing through concrete sample that voltage obtains according to this, set duration of test runs according to table 2;
Step 4, reach set test period after, break off D.C. regulated power supply, shed cathode test groove, anode test trough earlier, progressively unscrew upper limit set nut (12) again, shed load; Adopt tap water flushing concrete sample surface then and clean surperficial superfluous water with dried cloth; Concrete sample (17) is rived into 4 along the line of symmetry of the initial chloride permeability face of test specimen; The surface of contact that the initial chloride permeability face of this test specimen is concrete sample and cathode test groove sprays the AgNO of 0.1mol/L immediately on the concrete sample section of riving
3The WS after 15 minutes, is measured the mean distance between white colour developing separatrix and the initial chloride permeability face of test specimen, can obtain chloride permeability depth-averaged value X
d
Step 5, be calculated as follows concrete unstable state chlorion transport coefficient:
In the formula:
D---concrete unstable state chlorion transport coefficient, unit is 10
-12m
2/ s;
V---applied voltage, unit are V;
T---the initial temperature of anodic dissolution and the mean value of end temp, unit are ℃;
L---test specimen interpolar thickness, unit are mm;
X d ---chloride permeability depth-averaged value, unit is mm;
t---duration of test runs, unit is h.
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| CN103776707A (en) * | 2014-01-10 | 2014-05-07 | 浙江同济科技职业学院 | Testing platform for concrete bent load |
| CN104132847A (en) * | 2014-08-04 | 2014-11-05 | 河海大学 | Device and method for testing chloride corrosion of reinforced concrete member under continuous load |
| CN104977396A (en) * | 2015-06-01 | 2015-10-14 | 浙江工业大学 | Great fluidity concrete template lateral pressure simulation test method and test device |
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| CN104132847A (en) * | 2014-08-04 | 2014-11-05 | 河海大学 | Device and method for testing chloride corrosion of reinforced concrete member under continuous load |
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Application publication date: 20120711 |