CN205826489U - A kind of steel reinforced concrete erosion test cell - Google Patents
A kind of steel reinforced concrete erosion test cell Download PDFInfo
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- CN205826489U CN205826489U CN201620561589.7U CN201620561589U CN205826489U CN 205826489 U CN205826489 U CN 205826489U CN 201620561589 U CN201620561589 U CN 201620561589U CN 205826489 U CN205826489 U CN 205826489U
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Abstract
This utility model discloses a kind of steel reinforced concrete erosion test cell, and including armored concrete composite construction, pipeline, wire, armored concrete composite construction includes concrete test block and reinforcing bar, and steel-bar arrangement is in the middle position of concrete test block；Along concrete test block length direction, reinforcing bar runs through whole concrete test block, and concrete test block is stretched out at reinforcing bar two ends；Arranging sealant at the two ends of reinforcing bar, one end of reinforcing bar is connected with wire；Arranging duct on concrete test block, the two ends in duct are connected with seal for pipe joints respectively；Pipeline is connected with reserving liquid tank, and pump and effusion meter are set on pipeline, this programme utilizes pipeline, pump and effusion meter load solution to concrete test block and realize the direct control to flow velocity, brief introduction controls solution diffusion in concrete test block, and then the corrosion condition of follow-on test reinforcing bar, simple in construction, easy to use and can effectively simulate the corrosive environment of reinforcing bar, it is simple to the research to reinforcement corrosion.
Description
Technical field
This utility model belongs to reinforcement corrosion guard technology field, more particularly, it relates to a kind of steel reinforced concrete erosion
Test cell.
Background technology
Reinforced Concrete Materials is because of its low cost, easily construct and have good plasticity and durability, thus by extensively
It is applied in various industrial civil building, water conservancy project or sea work structure.Generally in xoncrete structure, the height that hydrated cementitious produces
Alkaline environment, can make rebar surface form one layer of iron oxides protective layer that can resist reinforcement corrosion.But, along with chlorine from
Son, the nuisance such as sulfate ion and carbon dioxide constantly from external environment condition toward infiltration concrete and external environment condition and load
Carrying out of the concrete structure crack caused, instability that this iron oxides protective layer gradually becomes and go to pot, and then excite
The corrosion of reinforcing bar.
Research to Steel Corrosion In Concrete Structures at present, is based primarily upon micro-cell corrosion theoretical, by analyzing reinforcing bar
Half-cell prtential and corrosion rate evaluate its corrosion condition, seldom theoretical based on macro cell corrosion, by analyzing cathode steel
The macro cell polarization characteristic of muscle and anode reinforcing bar evaluates its corrosion condition.The Appreciation gist of half-cell prtential is ASTM C876
Standard, whether this standard pin is in passive state or etch state to reinforcing bar, simply show a probability judgement, and should
Judge that the impact suffering dry and wet environment is the biggest；Secondly, this standard is only applicable to alkalescence xoncrete structure, ties for carbonated concrete
Structure is the most inapplicable, and when there is macro cell corrosion in xoncrete structure, uses half-cell prtential method will cause bigger mistake
Sentence.The Corrosion Rate of Steel obtained by linear polarization impedance method, electrochemical impedance Atlas Method or electrochemical noise method, usually used as
Micro-cell corrosion speed, this corrosion rate only when macro cell corrosion is left in the basket just close to the true corrosion rate of reinforcing bar.By
It is micro-cell corrosion speed and macro cell corrosion speed sum in the true corrosion rate of reinforcing bar, again due at active service xoncrete structure
The macro cell corrosion of middle reinforcing bar generally exists, so use linear polarization impedance method and electrochemical impedance Atlas Method will be low
Estimate the corrosion rate of reinforcing bar, affect the rational evaluation of reinforcement corrosion protection effect.Therefore theoretical based on micro-cell corrosion, by dividing
It is inaccurate and insecure that the half-cell prtential of analysis reinforcing bar and corrosion rate evaluate its corrosion condition.
In micro-cell corrosion, cathode chamber and anode region coexist alternately, and corrosion is also uniform；And mixing in reality
In Xtah Crude Clay structure, cathode chamber and anode region are separate and apart from each other, and corrosion is not, and this makes it easy to cause reinforcing bar grand
The formation of battery corrosion.When reinforcing bar is under macro cell corrosion state, the electronics of anode reinforcement corrosion release is transferred Zhiyin
Pole reinforcing bar is also consumed by negative electrode reinforcing bar, thus forms the macro cell current flowing to anode reinforcing bar from negative electrode reinforcing bar, and then causes
The corrosion potential of anode reinforcing bar increases (the macro cell polarization of anode reinforcing bar) and the corrosion electricity of negative electrode reinforcing bar towards positive potential direction
Position reduces (the macro cell polarization of negative electrode reinforcing bar) towards negative direction.Therefore the corrosion evaluating Steel Bars in Concrete Structure is considered as it
The polarization characteristic of macro cell corrosion and control mechanism.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, for the problems referred to above, proposes a kind of reinforced concrete
Soil corrosion test unit.This utility model simple in construction, easily operated, it is possible to realize the micro-cell corrosion state of reinforcing bar and grand electricity
The alternate cycles change of pond etch state, analyzes the macro cell potential difference between negative electrode reinforcing bar and anode reinforcing bar, grand electricity intuitively
The polarization ratio of pond corrosion current, negative electrode reinforcing bar and anode reinforcing bar and polarization slope, can each corrosion protection technology of effectively evaluating
Inhibition to reinforcing bar macro cell corrosion, additionally it is possible to illustrate the control mechanism of reinforcing bar macro cell corrosion under various corrosive environment.
For realizing above-mentioned technical purpose, the utility model proposes following technical scheme:
A kind of armored concrete composite construction, including concrete test block and reinforcing bar, wherein: steel-bar arrangement is at concrete test block
Middle position；Along concrete test block length direction, reinforcing bar runs through whole concrete test block, and concrete examination is stretched out at reinforcing bar two ends
Block；Arranging duct on concrete test block, described duct is uniformly arranged on one to be arranged on concrete test block middle position
Reinforcing bar is on the circumference in the center of circle, and along concrete test block length direction, whole concrete test block is run through in duct.
In technique scheme, the quantity in duct is 26, preferably 46.
In technique scheme, a length of 160-200mm of concrete test block, width is 60-100mm, and height is 60-
100mm。
In technique scheme, a diameter of 6-20mm in duct, the distance of duct centre distance reinforcing steel bar center is 6-
20mm。
Use technique scheme, reinforcing bar and duct are carried out position cooperation, simple in construction, easy to use and can be effective
The corrosive environment of simulation reinforcing bar, it is simple to the research to reinforcement corrosion.
For the armored concrete composite construction of corrosion test, including armored concrete composite construction, pipeline, wire, its
In: armored concrete composite construction, including concrete test block and reinforcing bar, steel-bar arrangement is in the middle position of concrete test block；Edge
Concrete test block length direction, reinforcing bar runs through whole concrete test block, and concrete test block is stretched out at reinforcing bar two ends；At reinforcing bar two
End arranges sealant, and one end of reinforcing bar is connected with wire；
Arranging duct on concrete test block, described duct is uniformly arranged on one to be arranged on concrete test block central authorities position
The reinforcing bar put is on the circumference in the center of circle, and along concrete test block length direction, whole concrete test block is run through in duct；The two of duct
End is connected with seal for pipe joints respectively；Pipeline opening straight up, and pipeline tapping is higher than concrete test block, full to realize liquid
Duct.
In technique scheme, the quantity in duct is 26, preferably 46.
In technique scheme, a length of 160-200mm of concrete test block, width is 60-100mm, and height is 60-
100mm。
In technique scheme, a diameter of 6-20mm in duct, the distance of duct centre distance reinforcing steel bar center is 6-
20mm。
In technique scheme, arranging screw and packing ring in one end of reinforcing bar, screw is screwed into inside reinforcing bar through packing ring,
Wire is connected with screw or packing ring, to realize the UNICOM of wire and the measurement circuit of reinforcing bar；And wire passes sealant.
In technique scheme, sealant is polystyrene resin layer.
In technique scheme, sealant covers the two ends of the reinforcing bar stretching out concrete test block, and extends to concrete
Reinforcing bar in oversite concrete test block in test block.
In technique scheme, in concrete test block, a length of 30-50mm of reinforcing bar that sealant covers.
Use technique scheme, utilize the pipeline of opening straight up to concrete test block load solution (such as chlorine from
Sub-solution, water, mortar etc.), and liquid level is higher than concrete test block, to maintain solution at coagulation to utilize law of connected vessels to make in pipeline
Diffusion in soil test block, and then the corrosion condition of follow-on test reinforcing bar, simple in construction, easy to use and can effectively simulate steel
The corrosive environment of muscle, it is simple to the research to reinforcement corrosion.
A kind of steel reinforced concrete erosion test cell, including armored concrete composite construction, pipeline, wire, wherein: reinforcing bar
Composite concrete structure, including concrete test block and reinforcing bar, steel-bar arrangement is in the middle position of concrete test block；Try along concrete
Block length direction, reinforcing bar runs through whole concrete test block, and concrete test block is stretched out at reinforcing bar two ends；Arrange close at the two ends of reinforcing bar
Sealing, one end of reinforcing bar is connected with wire；
Arranging duct on concrete test block, described duct is uniformly arranged on one to be arranged on concrete test block central authorities position
The reinforcing bar put is on the circumference in the center of circle, and along concrete test block length direction, whole concrete test block is run through in duct；The two of duct
End is connected with seal for pipe joints respectively；Pipeline is connected with reserving liquid tank, and arranges pump and effusion meter on pipeline, to realize reserving liquid tank
Middle liquid is entered concrete test block by the one end in duct, and the other end flows out and is back to reserving liquid tank, utilizes pump and effusion meter simultaneously
Cooperation, it is achieved control and the adjustment to liquid flow velocity in pipeline and duct.
In technique scheme, the quantity in duct is 26, preferably 46.
In technique scheme, a length of 160-200mm of concrete test block, width is 60-100mm, and height is 60-
100mm。
In technique scheme, a diameter of 6-20mm in duct, the distance of duct centre distance reinforcing steel bar center is 6-
20mm。
In technique scheme, arranging screw and packing ring in one end of reinforcing bar, screw is screwed into inside reinforcing bar through packing ring,
Wire is connected with screw or packing ring, to realize the UNICOM of wire and the measurement circuit of reinforcing bar；And wire passes sealant.
In technique scheme, sealant is polystyrene resin layer.
In technique scheme, sealant covers the two ends of the reinforcing bar stretching out concrete test block, and extends to concrete
Reinforcing bar in oversite concrete test block in test block.
In technique scheme, in concrete test block, a length of 30-50mm of reinforcing bar that sealant covers.
Using technique scheme, (such as chloride ion is molten to utilize pipeline, pump and effusion meter to load solution to concrete test block
Liquid, water, mortar etc.), and realize the direct control to flow velocity, brief introduction controls solution diffusion in concrete test block, Jin Erlian
The corrosion condition of continuous test reinforcing bar, simple in construction, easy to use and can effectively simulate the corrosive environment of reinforcing bar, it is simple to steel
The research of muscle corrosion.
The detection device of reinforcement in concrete macro cell corrosion, including two steel reinforced concrete erosion test cells, holds
Container, two of which steel reinforced concrete erosion test cell is arranged in same container, and arranges in container
Water；Two steel reinforced concrete erosion test cell structures are identical, and each steel reinforced concrete erosion test cell, mix including reinforcing bar
Solidifying soil composite construction, pipeline and wire, two steel reinforced concrete erosion test cells select the first steel reinforced concrete erosion to survey
The structure of examination unit or the structure of the second steel reinforced concrete erosion test cell: wherein
In the structure of the first steel reinforced concrete erosion test cell, armored concrete composite construction, including concrete
Test block and reinforcing bar, steel-bar arrangement is in the middle position of concrete test block；Along concrete test block length direction, reinforcing bar runs through whole mixed
Coagulate soil test block, and concrete test block is stretched out at reinforcing bar two ends；Sealant is set at the two ends of reinforcing bar, one end of reinforcing bar and wire phase
Even；Arranging duct on concrete test block, described duct is uniformly arranged on one to be arranged on concrete test block middle position
Reinforcing bar is on the circumference in the center of circle, and along concrete test block length direction, whole concrete test block is run through in duct；The two ends in duct are divided
It is not connected with seal for pipe joints；Pipeline opening straight up, and pipeline tapping is higher than concrete test block, is full of hole realizing liquid
Road；
In the structure of the second steel reinforced concrete erosion test cell, armored concrete composite construction, including concrete
Test block and reinforcing bar, steel-bar arrangement is in the middle position of concrete test block；Along concrete test block length direction, reinforcing bar runs through whole mixed
Coagulate soil test block, and concrete test block is stretched out at reinforcing bar two ends；Sealant is set at the two ends of reinforcing bar, one end of reinforcing bar and wire phase
Even；Arranging duct on concrete test block, described duct is uniformly arranged on one to be arranged on concrete test block middle position
Reinforcing bar is on the circumference in the center of circle, and along concrete test block length direction, whole concrete test block is run through in duct；The two ends in duct are divided
It is not connected with seal for pipe joints；Pipeline is connected with reserving liquid tank, and arranges pump and effusion meter on pipeline, to realize liquid in reserving liquid tank
Body is entered concrete test block by the one end in duct, and the other end flows out and is back to reserving liquid tank, utilizes joining of pump and effusion meter simultaneously
Close, it is achieved control and the adjustment to liquid flow velocity in pipeline and duct；
Arranging switch between two steel reinforced concrete erosion test cells, switch is surveyed with two steel reinforced concrete erosions respectively
Wire in examination unit is connected.
In technique scheme, the quantity in duct is 26, preferably 46.
In technique scheme, a length of 160-200mm of concrete test block, width is 60-100mm, and height is 60-
100mm。
In technique scheme, a diameter of 6-20mm in duct, the distance of duct centre distance reinforcing steel bar center is 6-
20mm。
In technique scheme, arranging screw and packing ring in one end of reinforcing bar, screw is screwed into inside reinforcing bar through packing ring,
Wire is connected with screw or packing ring, to realize the UNICOM of wire and the measurement circuit of reinforcing bar；And wire passes sealant.
In technique scheme, sealant is polystyrene resin layer.
In technique scheme, sealant covers the two ends of the reinforcing bar stretching out concrete test block, and extends to concrete
Reinforcing bar in oversite concrete test block in test block.
In technique scheme, in concrete test block, a length of 30-50mm of reinforcing bar that sealant covers.
The detection method of reinforcement in concrete macro cell corrosion, the reinforcing bar in a steel reinforced concrete erosion test cell is
Anode reinforcing bar, the reinforcing bar in another steel reinforced concrete erosion test cell is negative electrode reinforcing bar, carries out according to the following step:
Step 1, uses the water in flat vessel that two steel reinforced concrete erosion test cells are carried out moistening, so that two
The electricity general character is formed between steel reinforced concrete erosion test cell；
In step 1, concrete test block in two steel reinforced concrete erosion test cells is immersed water in whole or in part
In, to simulate the macro cell corrosion of different humidity or underwater concrete, such as by two steel reinforced concrete erosion test cells
Concrete test block is immersed in the water 3-5mm.
Step 2, by pipeline injection experiments liquid in the duct of concrete test block；
In step 2, experimental liquid is Chloride Solution or corrosion inhibitor solution.
Step 3, uses determinator to be connected with steel reinforced concrete erosion test cell；
In described step 3, determinator is corrosion diagnosis instrument or steel bar corrosion instrument or electrochemical workstation or zero electricity
Resistance galvanometer, in actual use, requires to be attached according to the use of each determinator.
Step 4: disconnect the wire between negative electrode reinforcing bar and anode reinforcing bar, persistently measures the micro-cell corrosion electricity of negative electrode reinforcing bar
Position Emi-cWith micro-cell corrosion electric current density imi-c, the micro-cell corrosion current potential E of anode reinforcing barmi-aClose with micro-cell corrosion electric current
Degree imi-a；
Step 5: connect the wire between negative electrode reinforcing bar and anode reinforcing bar, the macro cell corrosion list of test constantly negative electrode reinforcing bar
Position Ema-c, the macro cell corrosion current potential E of anode reinforcing barma-a, between negative electrode reinforcing bar and anode reinforcing bar flowing macro cell corrosion electric current
Density ima=ima-c=ima-a；
Step 6: step 4 and step 5 are tested as a cycle period, repetition step 4 and step 5.
In described step 4, the time of anode reinforcing bar and cathode steel tendon breaking open state (i.e. micro-cell corrosion state) is 2
4 weeks (i.e. one week is 7 days, and every day is 24 hours), in order between negative electrode reinforcing bar and anode reinforcing bar, micro-cell corrosion state is extensive
Multiple and stable.
In described step 5, the time of anode reinforcing bar and negative electrode reinforcing bar connection status (i.e. macro cell corrosion) is 24 weeks
(i.e. one week is 7 days, and every day is 24 hours), in order to flow through the macro cell corrosion electric current between negative electrode reinforcing bar and anode steel reinforcing bar
Stablize, and macro cell polarization stablize.
In described step 6, using step 4 and step 5 as a cycle period, an anode reinforcing bar and cathode steel tendon breaking
Open state and an anode reinforcing bar and negative electrode reinforcing bar connection status form a cycle period, and the time is that (i.e. one week was 7 in 48 weeks
My god, every day is 24 hours).
This utility model relative to prior art have the advantages that this utility model simple in construction, easy to operate,
Analysis method is simple and clear, it is possible to micro-cell corrosion effect and macro cell corrosion effect to reinforcing bar carry out commenting of Comprehensive
Valency, it is possible to illustrate the control model of reinforcing bar macro cell corrosion under each corrosive environment.
Accompanying drawing explanation
Fig. 1 is the structural representation (1) of the armored concrete composite construction in this utility model.
Fig. 2 is the structural representation (2) of the armored concrete composite construction in this utility model.
Fig. 3 is the structural representation of the armored concrete composite construction for corrosion test of the present utility model.
Fig. 4 is the structural representation of steel reinforced concrete erosion test cell of the present utility model.
Fig. 5 is that the negative electrode reinforcing bar in the detection device of reinforcement in concrete macro cell corrosion disconnects knot with anode reinforcing bar
Structure schematic diagram.
Fig. 6 is that the negative electrode reinforcing bar in the detection device of reinforcement in concrete macro cell corrosion shows with anode steel bar connecting structure
It is intended to.
Fig. 7 is the detection method schematic diagram (1) of reinforcement in concrete macro cell corrosion.
Fig. 8 is the detection method schematic diagram (2) of reinforcement in concrete macro cell corrosion.
Wherein 1 is concrete test block, and 2 is duct, and 3 is reinforcing bar, 4 sealants, and 5 is screw, and 6 is plain washer, and 7 is wire, 8
For plastic conduit, 9 is flat vessel, and 10 is negative electrode reinforcing bar, and 11 is anode reinforcing bar, and 12 is reserving liquid tank, and 13 is pump, and 14 is flow
Meter, 15 is switch.
Detailed description of the invention
With specific embodiment, this utility model is described in further detail below in conjunction with the accompanying drawings:
As shown in figure 1 and 2, armored concrete composite construction of the present utility model, including concrete test block and reinforcing bar, its
In: steel-bar arrangement is in the middle position of concrete test block；Along concrete test block length direction, reinforcing bar runs through the examination of whole concrete
Block, and reinforcing bar two ends stretch out concrete test block；Arranging duct on concrete test block, described duct is uniformly arranged on one to set
Put on the circumference that the reinforcing bar in concrete test block middle position is the center of circle, and along concrete test block length direction, duct runs through whole
Individual concrete test block.
In technique scheme, the quantity in duct is 4, lay respectively at the surface of reinforcing bar, underface, front-left and
Front-right, a diameter of 6mm, the distance of duct centre distance reinforcing steel bar center is 8mm；The a length of 160mm of concrete test block, width is
80mm, height is 80mm.
As it is shown on figure 3, the armored concrete composite construction for corrosion test of the present utility model, including such as Fig. 1 and 2 institute
The armored concrete composite construction that shows, pipeline, wire, wherein: armored concrete composite construction, including concrete test block and steel
Muscle, steel-bar arrangement is in the middle position of concrete test block；Along concrete test block length direction, reinforcing bar runs through the examination of whole concrete
Block, and reinforcing bar two ends stretch out concrete test block；Arranging sealant at the two ends of reinforcing bar, one end of reinforcing bar is connected with wire；
Arranging duct on concrete test block, described duct is uniformly arranged on one to be arranged on concrete test block central authorities position
The reinforcing bar put is on the circumference in the center of circle, and along concrete test block length direction, whole concrete test block is run through in duct；The two of duct
End is connected with seal for pipe joints respectively；Pipeline opening straight up, and pipeline tapping is higher than concrete test block, full to realize liquid
Duct.
In technique scheme, the quantity in duct is 4, lay respectively at the surface of reinforcing bar, underface, front-left and
Front-right, a diameter of 6mm, the distance of duct centre distance reinforcing steel bar center is 8mm；The a length of 160mm of concrete test block, width is
80mm, height is 80mm.
In technique scheme, arranging screw and packing ring in one end of reinforcing bar, screw is screwed into inside reinforcing bar through packing ring,
Wire is connected with screw or packing ring, to realize the UNICOM of wire and the measurement circuit of reinforcing bar；And wire passes sealant.
In technique scheme, sealant is polystyrene resin layer, and sealant covers the steel stretching out concrete test block
The two ends of muscle, and the reinforcing bar extended in concrete test block in oversite concrete test block.In concrete test block, sealant covers
The a length of 30mm of reinforcing bar.
As shown in Figure 4, a kind of steel reinforced concrete erosion test cell, it is combined including armored concrete as illustrated in fig. 1 and 2
Structure, pipeline, wire, wherein: armored concrete composite construction, including concrete test block and reinforcing bar, steel-bar arrangement is at concrete
The middle position of test block；Along concrete test block length direction, reinforcing bar runs through whole concrete test block, and coagulation is stretched out at reinforcing bar two ends
Soil test block；Arranging sealant at the two ends of reinforcing bar, one end of reinforcing bar is connected with wire；
Arranging duct on concrete test block, described duct is uniformly arranged on one to be arranged on concrete test block central authorities position
The reinforcing bar put is on the circumference in the center of circle, and along concrete test block length direction, whole concrete test block is run through in duct；The two of duct
End is connected with seal for pipe joints respectively；Pipeline is connected with reserving liquid tank, and arranges pump and effusion meter on pipeline, to realize reserving liquid tank
Middle liquid is entered concrete test block by the one end in duct, and the other end flows out and is back to reserving liquid tank, utilizes pump and effusion meter simultaneously
Cooperation, it is achieved control and the adjustment to liquid flow velocity in pipeline and duct.
In technique scheme, the quantity in duct is 4, lay respectively at the surface of reinforcing bar, underface, front-left and
Front-right, a diameter of 6mm, the distance of duct centre distance reinforcing steel bar center is 8mm；The a length of 160mm of concrete test block, width is
80mm, height is 80mm.
In technique scheme, arranging screw and packing ring in one end of reinforcing bar, screw is screwed into inside reinforcing bar through packing ring,
Wire is connected with screw or packing ring, to realize the UNICOM of wire and the measurement circuit of reinforcing bar；And wire passes sealant.
In technique scheme, sealant is polystyrene resin layer, and sealant covers the steel stretching out concrete test block
The two ends of muscle, and the reinforcing bar extended in concrete test block in oversite concrete test block.In concrete test block, sealant covers
The a length of 30mm of reinforcing bar.
As shown in Fig. 16, the detection device of reinforcement in concrete macro cell corrosion, including two steel reinforced concrete erosions
Test cell, container, two of which steel reinforced concrete erosion test cell is arranged in same container, and is containing
Put and container arranges water；Two steel reinforced concrete erosion test cell structures are identical, and the test of each steel reinforced concrete erosion is single
Unit, including armored concrete composite construction, pipeline and wire, two steel reinforced concrete erosion test cells select the first reinforcing bar
The structure of concrete erosion test cell or the structure of the second steel reinforced concrete erosion test cell: wherein
In the structure of the first steel reinforced concrete erosion test cell, armored concrete composite construction, including concrete
Test block and reinforcing bar, steel-bar arrangement is in the middle position of concrete test block；Along concrete test block length direction, reinforcing bar runs through whole mixed
Coagulate soil test block, and concrete test block is stretched out at reinforcing bar two ends；Sealant is set at the two ends of reinforcing bar, one end of reinforcing bar and wire phase
Even；Arranging duct on concrete test block, described duct is uniformly arranged on one to be arranged on concrete test block middle position
Reinforcing bar is on the circumference in the center of circle, and along concrete test block length direction, whole concrete test block is run through in duct；The two ends in duct are divided
It is not connected with seal for pipe joints；Pipeline opening straight up, and pipeline tapping is higher than concrete test block, is full of hole realizing liquid
Road；
In the structure of the second steel reinforced concrete erosion test cell, armored concrete composite construction, including concrete
Test block and reinforcing bar, steel-bar arrangement is in the middle position of concrete test block；Along concrete test block length direction, reinforcing bar runs through whole mixed
Coagulate soil test block, and concrete test block is stretched out at reinforcing bar two ends；Sealant is set at the two ends of reinforcing bar, one end of reinforcing bar and wire phase
Even；Arranging duct on concrete test block, described duct is uniformly arranged on one to be arranged on concrete test block middle position
Reinforcing bar is on the circumference in the center of circle, and along concrete test block length direction, whole concrete test block is run through in duct；The two ends in duct are divided
It is not connected with seal for pipe joints；Pipeline is connected with reserving liquid tank, and arranges pump and effusion meter on pipeline, to realize liquid in reserving liquid tank
Body is entered concrete test block by the one end in duct, and the other end flows out and is back to reserving liquid tank, utilizes joining of pump and effusion meter simultaneously
Close, it is achieved control and the adjustment to liquid flow velocity in pipeline and duct；
Arranging switch between two steel reinforced concrete erosion test cells, switch is surveyed with two steel reinforced concrete erosions respectively
Wire in examination unit is connected.
In technique scheme, the quantity in duct is 4, lay respectively at the surface of reinforcing bar, underface, front-left and
Front-right, a diameter of 6mm, the distance of duct centre distance reinforcing steel bar center is 8mm；The a length of 160mm of concrete test block, width is
80mm, height is 80mm.
In technique scheme, arranging screw and packing ring in one end of reinforcing bar, screw is screwed into inside reinforcing bar through packing ring,
Wire is connected with screw or packing ring, to realize the UNICOM of wire and the measurement circuit of reinforcing bar；And wire passes sealant.
In technique scheme, sealant is polystyrene resin layer, and sealant covers the steel stretching out concrete test block
The two ends of muscle, and the reinforcing bar extended in concrete test block in oversite concrete test block.In concrete test block, sealant covers
The a length of 30mm of reinforcing bar.
The detection method of reinforcement in concrete macro cell corrosion, the reinforcing bar in a steel reinforced concrete erosion test cell is
Anode reinforcing bar, the reinforcing bar in another steel reinforced concrete erosion test cell is negative electrode reinforcing bar, carries out according to the following step:
Step 1, uses the water in flat vessel that two steel reinforced concrete erosion test cells are carried out moistening, so that two
The electricity general character is formed between steel reinforced concrete erosion test cell；
In step 1, concrete test block in two steel reinforced concrete erosion test cells is immersed water in whole or in part
In, to simulate the macro cell corrosion of different humidity or underwater concrete, such as by two steel reinforced concrete erosion test cells
Concrete test block is immersed in the water 3-5mm.
Step 2, by pipeline injection experiments liquid in the duct of concrete test block；
In step 2, experimental liquid is Chloride Solution or corrosion inhibitor solution.
Step 3, uses determinator to be connected with steel reinforced concrete erosion test cell；
In described step 3, determinator is corrosion diagnosis instrument or steel bar corrosion instrument or electrochemical workstation or zero electricity
Resistance galvanometer, in actual use, requires to be attached according to the use of each determinator.
Step 4: disconnect the wire between negative electrode reinforcing bar and anode reinforcing bar, persistently measures the micro-cell corrosion electricity of negative electrode reinforcing bar
Position Emi-cWith micro-cell corrosion electric current density imi-c, the micro-cell corrosion current potential E of anode reinforcing barmi-aClose with micro-cell corrosion electric current
Degree imi-a；
Step 5: connect the wire between negative electrode reinforcing bar and anode reinforcing bar, the macro cell corrosion list of test constantly negative electrode reinforcing bar
Position Ema-c, the macro cell corrosion current potential E of anode reinforcing barma-a, between negative electrode reinforcing bar and anode reinforcing bar flowing macro cell corrosion electric current
Density ima=ima-c=ima-a；
Step 6: step 4 and step 5 are tested as a cycle period, repetition step 4 and step 5.
In described step 4, the time of anode reinforcing bar and cathode steel tendon breaking open state (i.e. micro-cell corrosion state) is 2
4 weeks (i.e. one week is 7 days, and every day is 24 hours), in order between negative electrode reinforcing bar and anode reinforcing bar, micro-cell corrosion state is extensive
Multiple and stable.
In described step 5, the time of anode reinforcing bar and negative electrode reinforcing bar connection status (i.e. macro cell corrosion) is 24 weeks
(i.e. one week is 7 days, and every day is 24 hours), in order to flow through the macro cell corrosion electric current between negative electrode reinforcing bar and anode steel reinforcing bar
Stablize, and macro cell polarization stablize.
In described step 6, using step 4 and step 5 as a cycle period, an anode reinforcing bar and cathode steel tendon breaking
Open state and an anode reinforcing bar and negative electrode reinforcing bar connection status form a cycle period, and the time is that (i.e. one week was 7 in 48 weeks
My god, every day is 24 hours).
When detecting, corrosion potential, also commonly referred to as half-cell prtential, by corrosion diagnosis instrument or steel bar corrosion instrument
Or electrochemical workstation records.Micro-cell corrosion electric current density imi, Stern-Geary equation calculate and obtain, it may be assumed that imi=B/
Rp, in formula: Rp is reinforcing bar impedance (k Ω .cm2), B is Stern-Geary constant.Reinforcing bar impedance Rp is by corrosion diagnosis instrument or steel
Muscle corrosion instrument or electrochemical workstation record.Macro cell corrosion electric current density ima, following formula calculate and obtain: ima=Ima/Aa, formula
In: ImaIt is macro cell corrosion electric current (μ A), AaIt is corroded area (generally reinforcing bar radial cross-section street, the cm of anode reinforcing bar2)。
Anode reinforcing bar is defined as discharging the reinforcing bar of electronics, can carry out judgement from the flow direction of grand electric current and draw.Macro cell corrosion electricity
Stream ImaZero resistance galvanometer is used to record.
In the off state, the micro-cell corrosion current potential E of negative electrode reinforcing bar is measuredmi-cWith micro-cell corrosion electric current density imi-c、
The micro-cell corrosion current potential E of anode reinforcing barmi-aWith micro-cell corrosion electric current density imi-a；In connected state, negative electrode reinforcing bar is measured
Macro cell corrosion unit Ema-c, the macro cell corrosion current potential E of anode reinforcing barma-a, between negative electrode reinforcing bar and anode reinforcing bar flowing
Macro cell corrosion electric current density ima=ima-c=ima-a。
In a cycle period or several cycle period, detection obtains above-mentioned electric current and electric potential signal is analyzed surveying
Commenting, the location parameter be given is as follows:
Potential difference Δ E between negative electrode reinforcing bar and anode reinforcing bar under off-state (micro-cell corrosion state)corr1=/
Emi-c-Emi-a/；
Potential difference Δ E between negative electrode reinforcing bar and anode reinforcing bar under connection status (macro cell corrosion state)corr4=/
Ema-c-Ema-a/；
The polarization potential difference of negative electrode reinforcing bar is its current potential under (micro cell) state of disconnection and connection (macro cell) state
Difference Δ Ecorr2=/Emi-c-Ema-c/；
The polarization potential difference of anode reinforcing bar is its current potential under (micro cell) state of disconnection and connection (macro cell) state
Difference Δ Ecorr3=/Ema-a-Emi-a/, and Δ Ecorr1=Δ Ecorr2+ΔEcorr3+ΔEcorr4；
The macro cell corrosion polarization ratio PR of negative electrode reinforcing barsteel-c=Δ Ecorr2/ΔEcorr1；
The macro cell corrosion polarization ratio PR of anode reinforcing barsteel-a=Δ Ecorr3/ΔEcorr1；
The macro cell corrosion polarization ratio PR of concrete impedancecon=Δ Ecorr4/ΔEcorr1, and PRsteel-c+PRsteel-a+
PRcon=1；
The macro cell corrosion polarization slope β of negative electrode reinforcing barma-c=Δ Ecorr2/[log(imi-c)-log(ima-c)]；
The macro cell corrosion polarization slope β of anode reinforcing barma-a=Δ Ecorr3/[log(ima-a)-log(imi-a)]。
Mensuration based on above-mentioned parameter, the control model evaluating reinforcement in concrete macro cell corrosion is as follows:
(1) negative electrode reinforcing bar control model (i.e. PRsteel-c>=60%, PRsteel-a≤ 30%, PRcon< 10%)；
(2) anode reinforcing bar control model (i.e. PRsteel-c≤ 30%, PRsteel-a>=60%, PRcon< 10%)；
(3) mixing control model (i.e. 30% < PRsteel-c< 60%, 30% < PRsteel-a< 60%, PRcon< 40%)；
(4) concrete impedance control pattern (i.e. PRsteel-c≤ 30%, PRsteel-a≤ 30%, PRcon>=40%).
In the detection and assay of reinforcement in concrete macro cell corrosion, potential difference, is to determine macro cell corrosion electricity
One of principal element of stream size, by analyzing potential difference Δ Ecorr1、ΔEcorr2、ΔEcorr3 and Δ Ecorr4 is rotten with macro cell
Erosion electric current density imaRelation, it is possible to preferably evaluate negative electrode reinforcing bar, anode reinforcing bar and concrete impedance to macro cell corrosion electricity
The impact of stream.Polarization ratio, is obtained by following manner, it may be assumed that with abscissa for Δ Ecorr1, vertical coordinate is Δ EcorrI (i=2,
3,4) draw scatterplot, and be fitted with linear function, then the slope of straight line is respectively defined as the polarization ratio of negative electrode reinforcing bar
Rate, the polarization ratio of anode reinforcing bar and the polarization ratio of concrete.Polarization ratio, it is possible to evaluate negative electrode reinforcing bar, anode reinforcing bar and
The concrete impedance Relative Contribution degree to macro cell corrosion；The control of reinforcing bar macro cell corrosion under each corrosive environment can be illustrated
Pattern；Reflect that anode and negative electrode reinforcing bar polarize release electronics and the ability of the consumption electronics that polarizes under macro cell corrosion state,
Negative electrode reinforcing bar and anode reinforcing bar can be evaluated under macro cell corrosion state, resist the power of corrosive power.
In being embodied as, reinforcing bar refer to regular reinforcement in xoncrete structure (such as HPB300, HRB335, HRBF335,
HRB400, HRBF400, HRB500, HRBF500).The strength grade of described concrete is C20～C60.The present embodiment is selected
It is HPB300 plain bar and strength grade is C30 concrete, be embodied as follows.
What the present embodiment was selected is HPB300 plain bar, diameter 20mm, long 180mm, the portion of reinforcing bar both ends 40mm length
Position all seals wrapped with polystyrene resin, and reinforcing bar is poured in the center position of 80 × 80 × 160mm concrete test block, and
Surrounding is uniform-distribution with the aperture of 4 diameter 6mm.At the HPB300 light of the preset 4 diameter 6mm of aperture position during concreting
Round bar, extracts out to form aperture before concrete coagulation hardening, after concrete test block hardening, by the aperture of test block end and
Plastic suction pipe polystyrene resin is tightly connected.
Strength grade of concrete used is C30, and its match ratio is cement: flyash: fluvial sand: rubble: additive: water=1:
0.43:3.11:3.8:0.014:0.6.Negative electrode concrete test block mixes 0%Cl-(accounting for Binder Materials quality), anode when pouring
Concrete test block mixes 3%Cl-(accounting for Binder Materials quality) when pouring, so that presenting between negative electrode reinforcing bar and anode reinforcing bar
Significantly corrosion potential is poor, it is simple under macro cell corrosion state, it is possible to observe negative electrode reinforcing bar and anode reinforcing bar clearly
Polarization behavior.
The all demouldings after pouring 1 day of negative electrode concrete test block and anode concrete test block, then proceed to be placed on the perseverance of 20 DEG C
Greenhouse carries out in water maintenance to age.Take out afterwards, a negative electrode test block and an anode test block are positioned over containing a small amount of
In the flat plastic ware of water, the water in vessel is just above lower limb about the 3-5mm of test block.Then it is put at room temperature
Put 2 weeks, make the humidity of test block keep relative stability with indoor humidity.
The corrosion diagnosis device used in the present embodiment is the CM-SE1 type corrosion diagnosis device of Ji Yan commercial firm of Nippon Steel exploitation, makes
Zero resistance electric current be calculated as the HM-103A type zero resistance galvanometer of Big Dipper electrician Co., Ltd..
First, the wire of negative electrode reinforcing bar test block and the wire of anode reinforcing bar test block are first off 2 weeks, now negative electrode
Reinforcing bar and anode reinforcing bar are respectively at micro-cell corrosion state；CM-SE1 corrosion diagnosis device is used to measure negative electrode reinforcing bar and the moon respectively
Pole reinforcing bar corrosion potential E under micro cell statemi-cAnd Emi-a, erosion resistance Rp-cAnd Rp-a, and mortar (i.e. concrete examination
Block) electrical impedance Rcon；The time interval measured is 1 day, in order to obtain the time varied curve of each corrosion parameter；During measurement, full
Water absorbent cotton is positioned between corrosion diagnosis device probe and concrete test block surface, to guarantee good current conductivity；Negative electrode
Reinforcing bar and negative electrode reinforcing bar corrosion electric current density in the off state are referred to as micro-cell corrosion electric current density imi-cAnd imi-a, can
Calculated by Stern-Geary equation and obtain, it may be assumed that imi=B/Rp, in formula, imiIt is micro-cell corrosion electric current density (μ A/cm2), Rp
It is reinforcing bar impedance (k Ω .cm2), B is Stern-Geary constant, when reinforcing bar be in etch state be value be 26mV, work as reinforcing bar
When being in passive state, value is 52mV.Test measurement data is shown in Table 1.
Then, the wire of negative electrode reinforcing bar test block and the wire of anode reinforcing bar test block again are at connection status 2 weeks, now negative electrode
Reinforcing bar and anode reinforcing bar are respectively at macro cell corrosion state；CM-SE1 corrosion diagnosis device is used to measure negative electrode reinforcing bar and the moon respectively
Pole reinforcing bar corrosion potential E under macro cell statema-cAnd Ema-a；Use HM-103A type zero resistance galvanometer to record and flow through negative electrode
Electric current between reinforcing bar and anode reinforcing bar, the grandest electric current；Macro cell corrosion electric current density is calculated by following formula and obtains, it may be assumed that ima=ima-c
=ima-a=Ima/Aa, in formula, imaIt is macro cell corrosion electric current density (μ A/cm2), ImaIt is macro cell corrosion electric current (μ A), AaIt is
Corroded area (the cm of anode reinforcing bar2)；Anode reinforcing bar is defined as discharging the reinforcing bar of electronics, can enter from the flow direction of grand electric current
Row judgement draws；The time interval measured is 1 day, in order to obtain the time varied curve of each corrosion parameter.
Off-state 2 weeks and connection status 2 weeks, this is defined as 1 test cycle for 4 weeks, and the present embodiment tries carrying out 6 times
After testing circulation, in the aperture of anode test block, inject the nitrite ion solution (NaNO of 8mol/L2), then proceed by test
It is recycled to 20 times.Test measurement data is shown in Table 1.
Calculate the potential difference Δ E between negative electrode reinforcing bar and anode reinforcing bar under (micro cell) state of disconnectioncorr1=/Emi-c-
Emi-a/, connect the potential difference Δ E between negative electrode reinforcing bar and anode reinforcing bar under (macro cell) statecorr4=/Ema-c-Ema-a/, cloudy
The polarization potential difference of pole reinforcing bar is its potential difference Δ E under (micro cell) state of disconnection and connection (macro cell) statecorr2
=/Emi-c-Ema-c/, the polarization potential difference of anode reinforcing bar is that it in (micro cell) state of disconnection and connects under (macro cell) state
Potential difference Δ Ecorr3=/Ema-a-Emi-a/, the macro cell corrosion polarization ratio PR of negative electrode reinforcing barsteel-c=Δ Ecorr2/Δ
Ecorr1, the macro cell corrosion polarization ratio PR of anode reinforcing barsteel-a=Δ Ecorr3/ΔEcorr1, the macro cell of concrete impedance
Corrosion polarization ratio PRcon=Δ Ecorr4/ΔEcorr1, the macro cell corrosion polarization slope β of negative electrode reinforcing barma-c=Δ Ecorr2/
[log(imi-c)-log(ima-c)], the macro cell corrosion polarization slope β of anode reinforcing barma-a=Δ Ecorr3/[log(ima-a)-log
(imi-a)].Result of calculation is shown in Table 1.
Analyze potential difference Δ Ecorr1、ΔEcorr2、ΔEcorr3 and Δ Ecorr4 with macro cell corrosion electric current density imaPass
System, evaluates negative electrode reinforcing bar, anode reinforcing bar and concrete (mortar) impedance impact on macro cell corrosion electric current.As shown in Table 1, when
After the aperture of anode test block injects the nitrite ion solution of 8mol/L, along with macro cell potential difference is gradually reduced, macro cell
Corrosion electric current density also decreases, and the inhibition of reinforcing bar macro cell corrosion is confirmed by nitrite ion.
Analyze polarization ratio, evaluate negative electrode reinforcing bar, anode reinforcing bar and concrete (mortar) impedance phase to macro cell corrosion
To percentage contribution, illustrate the control model of reinforcing bar macro cell corrosion under this corrosive environment.As shown in Table 1, negative electrode in the present embodiment
The polarization ratio of reinforcing bar is relatively big, plays main contributions, therefore in the present embodiment, the macro cell corrosion of reinforcing bar controls in macro cell corrosion
Pattern is that negative electrode reinforcing bar controls.
Analyze polarization slope, evaluate anode reinforcing bar and negative electrode reinforcing bar polarizes under macro cell corrosion state and discharges electronics and pole
Changing the ability consuming electronics, the power of corrosive power resisted under macro cell corrosion state by evaluation negative electrode reinforcing bar and anode reinforcing bar.
As shown in Table 1, when after the nitrite ion solution injecting 8mol/L in the aperture of anode test block, the polarization slope of anode reinforcing bar by
Gradually counterclockwise increasing, gradually strengthen the rejection ability of macro cell corrosion, nitrite ion is to reinforcing bar macro cell corrosion
Inhibition is confirmed.
Table 1 embodiment data and interpretation of result
Note: the present embodiment after carrying out 6 test cycles, inject in the aperture of anode test block the nitrous acid of 8mol/L from
Sub-solution (NaNO2), then proceed by test cycle to 20 times.Data Emi-c that are given in table, Emi-a, Rp-c, Rp-a,
Rcon, Ema-c, Ema-a, ima, ima-c, ima-a, be the meansigma methods of each stage surveyed data.
The above, embodiment the most of the present utility model, it is not intended to limit protection domain of the present utility model.
In addition to the implementation, this utility model can also have other embodiments.All employing equivalents or equivalence become
Change the technical scheme of formation, all fall within the protection domain of this utility model requirement.
Claims (8)
1. a steel reinforced concrete erosion test cell, it is characterised in that: include armored concrete composite construction, pipeline, wire,
Wherein: armored concrete composite construction, including concrete test block and reinforcing bar, steel-bar arrangement is in the middle position of concrete test block；
Along concrete test block length direction, reinforcing bar runs through whole concrete test block, and concrete test block is stretched out at reinforcing bar two ends；At reinforcing bar
Two ends arrange sealant, and one end of reinforcing bar is connected with wire；
Arranging duct on concrete test block, described duct is uniformly arranged on one to be arranged on concrete test block middle position
Reinforcing bar is on the circumference in the center of circle, and along concrete test block length direction, whole concrete test block is run through in duct；The two ends in duct are divided
It is not connected with seal for pipe joints；Pipeline is connected with reserving liquid tank, and arranges pump and effusion meter on pipeline.
2. a kind of steel reinforced concrete erosion test cell as claimed in claim 1, it is characterised in that: the quantity in described duct
It it is 26.
3. a kind of steel reinforced concrete erosion test cell as claimed in claim 1, it is characterised in that: described concrete test block
A length of 160-200mm, width is 60-100mm, and height is 60-100mm.
4. a kind of steel reinforced concrete erosion test cell as claimed in claim 1, it is characterised in that: the diameter in described duct
For 6-20mm, the distance of duct centre distance reinforcing steel bar center is 6-20mm.
5. a kind of steel reinforced concrete erosion test cell as claimed in claim 1, it is characterised in that: one end of described reinforcing bar
Arranging screw and packing ring, screw is screwed into inside reinforcing bar through packing ring, and wire is connected with screw or packing ring, and wire passes sealing
Layer.
6. a kind of steel reinforced concrete erosion test cell as claimed in claim 1, it is characterised in that: described sealant is poly-
Styrene resin lipid layer.
7. a kind of steel reinforced concrete erosion test cell as claimed in claim 1, it is characterised in that: described sealant covers
Stretch out the two ends of the reinforcing bar of concrete test block, and the reinforcing bar extended in concrete test block in oversite concrete test block.
8. a kind of steel reinforced concrete erosion test cell as claimed in claim 7, it is characterised in that: described concrete test block
In, a length of 30-50mm of reinforcing bar that sealant covers.
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| CN109655398A (en) * | 2019-02-27 | 2019-04-19 | 长安大学 | A kind of device and measurement method for the corrosion of testing conductive concrete steel bridge panel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655398A (en) * | 2019-02-27 | 2019-04-19 | 长安大学 | A kind of device and measurement method for the corrosion of testing conductive concrete steel bridge panel |
| CN109655398B (en) * | 2019-02-27 | 2023-11-10 | 长安大学 | Device for testing corrosion of conductive concrete steel bridge deck and measuring method |
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