CN102621049A - Concrete chloride ion migration coefficient load testing device under bending stress, and testing method thereof - Google Patents
Concrete chloride ion migration coefficient load testing device under bending stress, and testing method thereof Download PDFInfo
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Abstract
The invention discloses a concrete chloride ion migration coefficient load testing device under a bending stress, and a testing method thereof. According to the invention, an elastic connecting piece in a compression state is adopted to apply a continuous bending stress to a concrete test piece and the concrete test piece loaded with the continuous bending stress is subjected to electric acceleration chloride ion migration test to calculate to obtain the chloride ion migration coefficient of the concrete test piece in above state. So, the device of the invention solves problems that the practical loading state of the concrete in service cannot be stimulated and the concrete migration coefficient under continuous bending load conditions cannot be determined because routine concrete chloride ion migration coefficient testing devices cannot load the test piece; and the resilience of the elastic connecting piece is utilized to apply continuous stable bending force to the concrete test piece, so the pressure stress reduction caused by creeping of the concrete test piece during tension screw loading is avoided, thereby influences of the continuous bending load condition to the concrete chloride ion permeability can be researched, the chloride ion penetration resistance of concrete under a loaded condition can be evaluated, and research accomplishments can provide bases for concrete structure designing, reinforcing and service life evaluating if the research accomplishments are extended and applied to practical engineering.
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 concrete chloride ion transport coefficient under the bending load condition.
Background technology
The intrusion of chlorion is the one of the main reasons that causes the reinforced concrete structure steel bar corrosion, and therefore concrete chloride ion permeability is the important symbol of reinforced concrete permanance.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 all considered, also can't be realized tested test specimen while load application; The actual conditions that all can bear the effect of dissimilar loads with in commission xoncrete structure are not inconsistent; And load; Especially bending load tends to greatly influence the generation and the expansion of microfracture in the concrete, influences concrete perviousness.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; But this device is through being drawn screw rod to keep the bending load 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; 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 compression spring continues tensile load to test specimen; But this device can not provide bending 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 loading condition by bending 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 apply the problem of bending load to test specimen, and the loading and the proving installation of the quick chlorion transport coefficient test of concrete under a kind of lasting bending load condition is provided.
For realizing above technical purpose, the present invention will take following technical scheme:
Concrete chloride ion transport coefficient loading test device under a kind of bending stress; Comprise that crooked charger and electricity quicken chlorion fast transferring device; Wherein: said crooked charger; Comprise testing jig and linear drive apparatus, said testing jig comprises base, guide frame, lower support plate, intermediate support plate and load plate, and an end of guide frame is fixedly connected with base; The other end of guide frame then passes lower support plate, intermediate support plate and load plate successively and places, and is movable the setting between guide frame and lower support plate, intermediate support plate and the load plate; Between lower support plate and the base Flexible Connector is set; Lower support plate is provided with two groups of first supporting members separately towards the intermediate support plate; The intermediate support plate then two groups of first pressure heads separately are set towards lower support plate; Put concrete sample between first supporting member and first pressure head, and the distance between the distance between two group of first supporting member and two group of first pressure head does not wait; Load plate is connected with the clutch end of linear drive apparatus, through ball seat force cell is installed between intermediate support plate and the load plate, and the signal output part of said force cell is connected with the dynamometry instrument; The center of base, lower support plate, intermediate support plate, load plate, force cell is in same straight line; Said electricity quickens chlorion fast transferring device, comprises test flume, and cathode test groove, anode test flume are arranged in this test flume split, and concrete sample is clamped between cathode test groove, the anode test flume through bolt assembly respectively; The anode test flume is connected with the positive pole of D.C. regulated power supply, and the cathode test groove then is connected with the negative pole of D.C. regulated power supply, and splendid attire Cl in the cathode test groove
-Solution.
Also be socketed with the upper bracket plate on the guide frame between said load plate and the intermediate support plate; Said upper bracket plate is provided with two groups of second pressure heads separately towards the intermediate support plate; The intermediate support plate then is provided with two groups of second supporting members separately towards the upper bracket plate; And put another block concrete test specimen between second pressure head, second supporting member, the spacing between the spacing between two group of second pressure head and two group of second supporting member does not wait simultaneously.
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 lower support plate, intermediate support plate, upper bracket plate successively and load plate is placed, simultaneously each root screw rod all with lower support plate, intermediate support plate, upper bracket plate, load plate between the activity setting.
The first support nut is set between said lower support plate and the intermediate support plate; The first support nut is set between intermediate support plate and the upper bracket plate; Load plate then and the 3rd support nut is set between the upper bracket plate; And load plate is through loading the locking of stop nut and screw rod, and the said first support nut, the second support nut, the 3rd support nut, loading stop nut all cooperate with screw flight.
Said linear drive apparatus is a hydraulic jack; The top of said load plate also is provided with top board, and said top board and guide frame are fixed, and hydraulic jack is placed between load plate and the top board simultaneously.
Described intermediate support plate is I-shaped setting.
Said Flexible Connector is a spring, and each the root screw rod body of rod periphery between lower support plate and the base all is socketed with spring, and the two ends of this spring are inconsistent with base and lower support plate respectively.
Spacing between spacing between two group of first supporting member and two group of second pressure head is consistent; Spacing between spacing between two group of second supporting member and two group of first pressure head is consistent; And the distance between two group of first supporting member is 3 times of distance between two group of first pressure head, and each supporting member, pressure head all are symmetrically distributed according to the axis of testing jig simultaneously.
Another technical purpose of the present invention provides a kind of method of testing based on concrete chloride ion transport coefficient loading test device under the above-mentioned bending stress; May further comprise the steps: step 1, a concrete sample to be measured (18) is positioned on the supporting member of lower support plate (4); Another piece concrete sample to be measured (18) is positioned on the supporting member of intermediate support plate (6); Unclamp the first support stop nut, the 3rd support stop nut, the second support stop nut successively; With hydraulic jack (17) load plate (10) is exerted pressure, and pressure is applied on the Flexible Connector (3) through load plate (10), force cell (161), ball seat (15), upper bracket plate (8), first concrete sample, intermediate support plate (6), second concrete sample and lower support plate (4); When the on-load pressure value that is shown when dynamometer instrument (162) is consistent with preset pressure value, tightens and load stop nut (11);
| Initial current value (mA during initial voltage | <15 | 15 ~ 20 | 20-30 | 30-40 | 40-60 | 60-90 | 90-120 | 120-180 | >=180-360 |
| Adjust after-applied voltage (V) | 1.2b | 1.0b | 0.8b | 0.7b | 0.6b | 0.5b | 0.4b | 0.3b | 0.2b |
Table 1
| Initial current value (mA behind the adjustment voltage | <10 | 10-20 | 20-120 | >120 |
| Duration of test runs (h) | 98 | 48 | 24 | 6 |
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;
Be calculated as follows the concrete sample simple bending and draw the bending stress of distinguishing differing heights y place:
In the formula: σ
y : the bending stress/MPa at height y place; F: on-load pressure/N; L: the spacing/mm between the spacing between two group of first supporting member and two group of second pressure head; B: concrete sample two interpolar thickness/mm; H: concrete sample height/mm; Y: measurement point is from test specimen neutral line height (mm);
In the formula:
D σ y: bending stress is σ
yPlace's concrete chloride ion transport coefficient, unit is 10
-12m
2/ s;
U: applied voltage, unit are V;
T: the initial temperature of anodic dissolution and the mean value of end temp, unit are ℃;
b: specimen thickness, unit is mm;
X D,σ y
: bending stress is σ
yPlace's concrete chloride ion length of penetration mean value, unit is mm;
t: duration of test runs, unit is h.
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 concrete chloride ion transport coefficient under the bending load condition.
2, adopt compression spring as the loading source; Utilize the bounce of spring that concrete sample is applied continual and steady bending force; Can avoid using when being drawn screw rod to load because creeping of concrete sample causes compressive stress to reduce; Continue of the influence of bending load condition thereby can study to permeability of concrete chloride ions; Estimate the chloride-penetration resistance ability of concrete under loaded 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, through single test, just can obtain concrete chlorion transport coefficient under the differently curved load of zero load to maximum deflection load, convenient and time-saving;
4, apparatus structure is simple, and is easy to operate, and bending load is 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 2 concrete samples is housed;
Fig. 2 is the synoptic diagram that the quick chlorion transport coefficient test of the concrete bending load charger of 2 concrete samples is housed;
Fig. 3 is the synoptic diagram that the quick chlorion transport coefficient test of the concrete bending load charger of 1 concrete sample is housed; Fig. 4 is the structural representation of intermediate support plate;
Fig. 5 (a) is the structural representation of test flume; Fig. 5 (b) is an A-A sectional structure synoptic diagram among Fig. 5 (a);
Fig. 6 is a concrete sample slice position synoptic diagram after the chlorion migration test;
Fig. 7 is stress distribution and a chloride permeability depth survey synoptic diagram in the concrete sample tension district;
Fig. 8 is the chlorion transport coefficient curve map of different intensity grades concrete under differently curved stress;
Fig. 9 is the chlorion transport coefficient curve map of different intensity grades concrete under differently curved stress level;
Reference numeral: 1, base; 2, screw rod; 3, Flexible Connector; 4, lower support plate; 5, the first support nut; 6, intermediate support plate; 7, the second support nut; 8, upper bracket plate; 9, the 3rd support nut; 10, load plate; 11, load stop nut; 12, top board support nuts; 13, top board; 14, top board fastening bolt cap; 15, ball seat; 161, force cell; 162, dynamometer instrument; 17, hydraulic jack; 18, concrete sample; 19, test flume; 20, test flume tackbolt; 21, 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.
Concrete chloride ion transport coefficient loading test device under the bending stress
Shown in Fig. 1 to 7; Concrete chloride ion transport coefficient loading test device comprises that crooked charger, electricity quicken chlorion fast transferring device under the bending stress according to the invention; Wherein, crooked charger by base 1, screw rod 2, spring fastenings 3, lower support plate 4, the first support nut 5, intermediate support plate 6, the second support nut 7, upper bracket plate 8, the 3rd support nut 9, load plate 10, load stop nut 11, top board support nuts 12, top board 13, top board fastening bolt cap 14, ball seat 15, force cell 161, dynamometer instrument 162 and hydraulic jack 17 and constitute;
The one side center of going up of lower support plate 5 is provided with two fixing bearings, and standoff distance is 300mm, and the upper and lower surface center of intermediate support plate 6 is equipped with two fixing bearings; Standoff distance 100mm;, the following one side center of upper bracket plate 8 is provided with two fixing bearings, and standoff distance is 300mm;
Respectively there is a M26 screw near the 55mm place that is from both sides of four drift angles of base 1, and respectively there is a φ 30mm circular hole near the 55mm place that is from both sides of four drift angles of lower support plate 4, intermediate support plate 6, upper bracket plate 8, load plate 10 and top board 13;
The screw rod 2 of 4 M26 is screwed into 4 screws of base 1; The spring fastenings 3 of 4 high 300mm, elasticity coefficient 100N/mm is enclosed within respectively on 4 screw rods, screw rod 2 is passed lower support plate 4, the first support nut 5, intermediate support plate 6, the second support nut 7, upper bracket plate 8, the 3rd support nut, load plate 10 respectively, loads stop nut 11, top board support nuts 12, top board 13 and top board fastening bolt cap 14; On upper bracket plate 8, simultaneously hitting exactly and placing ball seat 15 from bottom to top is the force cell 161 of 50 kN with maximum range, between top board 13 and load plate 10, places 50kN hydraulic jack 17;
A concrete sample 18 to be measured is positioned on the bearing of lower support plate 4; Another piece concrete sample 18 to be measured is positioned on the bearing of intermediate support plate 6; Unclamp the first support nut 5, upper bracket plate support nuts 10 successively and load steel plate support nuts 7; Exert pressure with 17 pairs of load plate 10 of hydraulic jack, pressure is applied to pressure on the spring fastenings 3 through loading steel plate 8, force cell 161, ball seat 15, upper bracket plate 8 concrete samples 18, intermediate support plate 6 and lower support plate 4; When dynamometer instrument 162 display setting force value, tighten and load steel plate fastening bolt cap 11, make spring be in compressive state; The screen resilience of compression spring has applied continual and steady bending load through getting bearing on lower support plate and the intermediate support plate to two concrete samples 18.
Two test flumes 19 that electricity is quickened chlorion fast transferring device are installed on the relative side of concrete sample two respectively; Connect with test flume tackbolt 20; With the positive pole of D.C. regulated power supply 21 and negative pole respectively with two test flumes 19 in copper mesh sheet 192 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, measure, can the upper bracket plate be removed, perhaps be inverted the upper bracket plate, the pressure head of upper bracket plate can be solved towards load plate if only carry out a block concrete test specimen; Have, Flexible Connector can be selected spring again, 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, the first support nut 5 of the present invention, the second support nut 7, the 3rd support nut 9 are unnecessary parts also, have adopted the first support nut 5, the second support nut 7, the 9 just assemblings of whole device for ease of the 3rd support nut.
Adopt said apparatus to carry out the quick chlorion transport coefficient of the little concrete of bending load effect method of testing
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 concrete sample of 100 mm * 100 mm * 400 mm, 6 test specimens of each proportioning.Test specimen is got the reference of 3 sizes of loading when measuring bending strengths 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
By the horizontal η of bending load is that 50% loading is measured, and measures 3 test specimens for every group.
The on-load pressure value is calculated as follows:
In the formula: F: on-load pressure/N; σ
f : concrete sample bending strength/MPa; η: loading level; L: the spacing/mm between the spacing between two group of first supporting member and two group of second pressure head; B: concrete sample two interpolar thickness/mm; H: concrete sample height/mm;
Table 4 is respectively organized the test specimen test procedure
Step 4, reach set the test test specimen after, deenergization sheds two test flumes 18 that electricity quickens chlorion fast transferring device, progressively unscrews to load steel plate fastening bolt cap 12, sheds load.Also clean surperficial superfluous water with tap water flushing concrete sample surface immediately with dried cloth.With cutting machine concrete sample 18 being cut into two sections at center position, is starting point with two new tangent planes, and the section of 3 thick 10 mm is respectively cut on both sides, and test specimen sprays the AgNO of 0.1mol/L immediately on the tangent plane of each section
3The WS after 15 minutes, is drawn white colour developing separatrix with pencil.Be cut into two sections at the cross-sectional direction center position; With two new tangent planes is starting point; Two section concrete test specimens are vertically equidistantly cut into slices along test specimen; First test specimen is cut into slices between two application points of first group of pressure head, second test specimen is cut into slices between two group of second supporting member application point, slice numbers is no less than 6; On the tangent plane of obtain section, spray the AgNO of 0.1mol/L then
3The WS after 15 minutes, is drawn white colour developing separatrix; Begin from maximum flexural tensile stress face at last; Measure each section from test specimen neutral line differing heights y place the develop the color distance of separatrix and the initial chloride permeability face of test specimen of white, with the mean value of the sustained height y place measured value of all tangent planes of all sections as this test specimen concrete chloride permeability depth-averaged value X under the corresponding bending stress of height y value
d, initial chloride permeability face refers to contacting of cathode test groove and concrete sample;
In the formula:
D σ y---bending stress is σ
yPlace's concrete chloride ion transport coefficient, 10
-12m
2/ s;
U---applied voltage, V;
T---the initial temperature of anodic dissolution and the mean value of end temp, ℃;
b---specimen thickness, mm;
X D,σ y
---transverse stress is σ
yPlace's concrete chloride ion length of penetration mean value, mm;
t---duration of test runs, h.
Get the mean values of 3 test specimen chlorions migration system on the same group, estimate concrete at this resistance of chloride ion penetration under loading status by bending as the chlorion transport coefficient of this group test specimen.
Be calculated as follows the concrete sample simple bending and draw the bending stress of distinguishing the differing heights place.
In the formula: σ
y : the bending stress/MPa at height y place; F: on-load pressure/N; Y: measurement point is from test specimen neutral line height (mm);
Record different intensity grades concrete chlorion transport coefficient such as Fig. 8 and shown in Figure 9 at differently curved stress and differently curved stress level.
Claims (9)
1. concrete chloride ion transport coefficient loading test device under the bending stress is characterized in that, comprises that crooked charger and electricity quicken chlorion fast transferring device, wherein:
Said crooked charger; Comprise testing jig and linear drive apparatus; Said testing jig comprises base, guide frame, lower support plate, intermediate support plate and load plate; One end of guide frame is fixedly connected with base, and the other end of guide frame then passes lower support plate, intermediate support plate and load plate successively and places, and is movable the setting between guide frame and lower support plate, intermediate support plate and the load plate; Between lower support plate and the base Flexible Connector is set; Lower support plate is provided with two groups of first supporting members separately towards the intermediate support plate; The intermediate support plate then two groups of first pressure heads separately are set towards lower support plate; Put concrete sample between first supporting member and first pressure head, and the distance between the distance between two group of first supporting member and two group of first pressure head does not wait; Load plate is connected with the clutch end of linear drive apparatus, through ball seat force cell is installed between intermediate support plate and the load plate, and the signal output part of said force cell is connected with the dynamometry instrument; The center of base, lower support plate, intermediate support plate, load plate, force cell is in same straight line;
Said electricity quickens chlorion fast transferring device, comprises test flume, and cathode test groove, anode test flume are arranged in this test flume split, and concrete sample is clamped between cathode test groove, the anode test flume through bolt assembly respectively; The anode test flume is connected with the positive pole of D.C. regulated power supply, and the cathode test groove then is connected with the negative pole of D.C. regulated power supply, and splendid attire Cl in the cathode test groove
-Solution.
2. according to concrete chloride ion transport coefficient loading test device under the said bending stress of claim 1; It is characterized in that; Also be socketed with the upper bracket plate on the guide frame between said load plate and the intermediate support plate; Said upper bracket plate is provided with two groups of second pressure heads separately towards the intermediate support plate; The intermediate support plate then is provided with two groups of second supporting members separately towards the upper bracket plate, and puts another block concrete test specimen between second pressure head, second supporting member, and the spacing between the spacing between two group of second pressure head and two group of second supporting member does not wait simultaneously.
3. according to concrete chloride ion transport coefficient loading test device under the said bending stress of claim 2; 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, and the other end of each root screw rod then passes lower support plate, intermediate support plate, upper bracket plate successively and load plate is placed, simultaneously each root screw rod all with lower support plate, intermediate support plate, upper bracket plate, load plate between the activity setting.
4. according to concrete chloride ion transport coefficient loading test device under the said bending stress of claim 3; It is characterized in that; The first support nut is set between said lower support plate and the intermediate support plate; The first support nut is set between intermediate support plate and the upper bracket plate; Load plate then and the 3rd support nut is set between the upper bracket plate, and load plate is through loading stop nut and screw rod locking, the said first support nut, the second support nut, the 3rd support nut, loading stop nut all cooperate with screw flight.
5. according to concrete chloride ion transport coefficient loading test device under the said bending stress of claim 4, it is characterized in that said linear drive apparatus is a hydraulic jack; The top of said load plate also is provided with top board, and said top board and guide frame are fixed, and hydraulic jack is placed between load plate and the top board simultaneously.
6. according to concrete chloride ion transport coefficient loading test device under the said bending stress of claim 5, it is characterized in that described intermediate support plate is I-shaped setting.
7. according to concrete chloride ion transport coefficient loading test device under the said bending stress of claim 6; It is characterized in that; Said Flexible Connector is a spring; Each root screw rod body of rod periphery between lower support plate and the base all is socketed with spring, and the two ends of this spring are inconsistent with base and lower support plate respectively.
8. according to concrete chloride ion transport coefficient loading test device under the said bending stress of claim 7; It is characterized in that; Spacing between spacing between two group of first supporting member and two group of second pressure head is consistent; Spacing between spacing between two group of second supporting member and two group of first pressure head is consistent, and the distance between two group of first supporting member is 3 times of distance between two group of first pressure head, and each supporting member, pressure head all are symmetrically distributed according to the axis of testing jig simultaneously.
9. method of testing based on concrete chloride ion transport coefficient loading test device under the said bending stress of claim 8; It is characterized in that; May further comprise the steps: step 1, a concrete sample to be measured (18) is positioned on the supporting member of lower support plate (4); Another piece concrete sample to be measured (18) is positioned on the supporting member of intermediate support plate (6); Unclamp the first support stop nut, the 3rd support stop nut, the second support stop nut successively; With hydraulic jack (17) load plate (10) is exerted pressure, and pressure is applied on the Flexible Connector (3) through load plate (10), force cell (161), ball seat (15), upper bracket plate (8), first concrete sample, intermediate support plate (6), second concrete sample and lower support plate (4); When the on-load pressure value that is shown when dynamometer instrument (162) is consistent with preset pressure value, tightens and load stop nut (11);
Step 2, two block concrete test specimens are clamped between cathode test groove, the anode test flume through bolt assembly respectively; Then the anode test flume is connected with the positive pole of D.C. regulated power supply; The cathode test groove then is connected with the negative pole of D.C. regulated power supply, and in anode test flume, cathode test groove, to fill with NaOH solution that concentration is 0.3mol/L and mass concentration respectively be 10.0% NaCl solution;
Step 3, open D.C. regulated power supply,, initial voltage is adjusted to 0.6b/V, measure initial current through concrete sample according to concrete sample (18) two interpolar thickness b/mm; The initial current value that records during according to initial voltage confirms that by table 1 follow-up test applies voltage:
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 earlier, shed cathode test groove, anode test flume (18), then progressively unscrew loading stop nut (11), shed load; Then behind the clean concrete sample surface; Concrete sample (18) is cut into two sections at the cross-sectional direction center position; With two new tangent planes is starting point, and two section concrete test specimens are vertically equidistantly cut into slices along test specimen, and first test specimen is cut into slices between two application points of first group of pressure head; Second test specimen is cut into slices between two group of second supporting member application point, and slice numbers is no less than 6; On the tangent plane of obtain section, spray the AgNO of 0.1mol/L then
3The WS after 15 minutes, is drawn white colour developing separatrix; Begin from maximum flexural tensile stress face at last; Measure each section from test specimen neutral line differing heights y place the develop the color distance of separatrix and the initial chloride permeability face of test specimen of white, with the mean value of the sustained height y place measured value of all tangent planes of all sections as this test specimen concrete chloride permeability depth-averaged value X under the corresponding bending stress of height y value
d, initial chloride permeability face refers to the surface of contact of cathode test groove and concrete sample;
Be calculated as follows the concrete sample simple bending and draw the bending stress of distinguishing differing heights y place:
In the formula: σ
y : the bending stress/MPa at height y place; F: on-load pressure/N; L: the spacing/mm between the spacing between two group of first supporting member and two group of second pressure head; B: concrete sample two interpolar thickness/mm; H: concrete sample height/mm; Y: measurement point is from test specimen neutral line height (mm);
Step 5, be calculated as follows concrete chlorion transport coefficient:
In the formula:
D σ y: bending stress is σ
yPlace's concrete chloride ion transport coefficient, unit is 10
-12m
2/ s;
U: applied voltage, unit are V;
T: the initial temperature of anodic dissolution and the mean value of end temp, unit are ℃;
b: specimen thickness, unit is mm;
X D,σ y
: bending stress is σ
yPlace's concrete chloride ion length of penetration mean value, unit is mm;
t: duration of test runs, unit is h.
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