CN105891101B - The detection device and method of reinforcement in concrete macro cell corrosion - Google Patents
The detection device and method of reinforcement in concrete macro cell corrosion Download PDFInfo
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- CN105891101B CN105891101B CN201610397694.6A CN201610397694A CN105891101B CN 105891101 B CN105891101 B CN 105891101B CN 201610397694 A CN201610397694 A CN 201610397694A CN 105891101 B CN105891101 B CN 105891101B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
Abstract
The invention discloses the detection device of reinforcement in concrete macro cell corrosion and methods, device includes two steel reinforced concrete erosion test cells, including armored concrete composite construction, pipeline, conducting wire, armored concrete composite construction, including concrete test block and reinforcing bar, steel-bar arrangement is in the central location of concrete test block；At the position that reinforcing bar stretches out concrete test block, sealant is set；One end of reinforcing bar is connected with conducting wire；Duct is set on concrete test block, and the both ends in duct are connected with seal for pipe joints respectively；Two steel reinforced concrete erosion test cells are arranged in the same container, and water is arranged in container, and the conducting wire of two steel reinforced concrete erosion test cells is connected to and switch is arranged.The configuration of the present invention is simple, easy to operate, analysis method is simple and clear, can micro-cell corrosion effect to reinforcing bar and macro cell corrosion effect carry out the evaluation of Comprehensive, the control model of reinforcing bar macro cell corrosion under each corrosive environment can be illustrated.
Description
Technical field
The invention belongs to reinforcement corrosion protection technology fields, more specifically to reinforcement in concrete macro cell corrosion
Detection device and method.
Background technique
Reinforced Concrete Materials is because of its at low cost, easy construction and has good plasticity and durability, thus extensive
Applied in various industrial civil buildings, water conservancy project or marine worker structure.Usually in concrete structure, the height of hydrated cementitious generation
Alkaline environment can make rebar surface form one layer of ferriferous oxide protective layer that can resist reinforcement corrosion.However, with chlorine from
The nuisances such as son, sulfate ion and carbon dioxide are constantly permeated from external environment into concrete and external environment and load
The development of caused concrete structure crack, gradually become unstable of the ferriferous oxide protective layer and go to pot, and then excite
The corrosion of reinforcing bar.
At present to the research of Steel Corrosion In Concrete Structures, it is based primarily upon micro-cell corrosion theory, by analyzing reinforcing bar
Half-cell prtential and corrosion rate evaluate its corrosion condition, it is seldom theoretical based on macro cell corrosion, pass through analysis 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
Whether standard, the standard are in passive state or etch state for reinforcing bar, simply show a probability sex determination, and should
Judgement is very big by the influence of dry and wet environment；Secondly, the standard is only applicable to alkaline concrete structure, for carbonated concrete knot
Structure is simultaneously not suitable for, and when, there are when macro cell corrosion, causing biggish mistake using half-cell prtential method in concrete structure
Sentence.The Corrosion Rate of Steel obtained by linear polarization impedance method, electrochemical impedance Atlas Method or electrochemical noise method, usually as
Micro-cell corrosion speed, the corrosion rate is only when macro cell corrosion is ignored just close to the true corrosion rate of reinforcing bar.By
In the true corrosion rate of reinforcing bar be the sum of micro-cell corrosion speed and macro cell corrosion speed, and due in active service concrete structure
The macro cell corrosion of middle reinforcing bar is generally existing, so will be low using linear polarization impedance method and electrochemical impedance Atlas Method
The corrosion rate for estimating reinforcing bar influences the rational evaluation of reinforcement corrosion protection effect.Therefore theoretical based on micro-cell corrosion, by dividing
Analyse reinforcing bar half-cell prtential and corrosion rate come evaluate its corrosion condition be inaccuracy and it is insecure.
In micro-cell corrosion, cathodic region and anode region interaction are coexisted, and corrosion is also uniform；And in the mixed of reality
In Xtah Crude Clay structure, cathodic region and anode region be it is separated and apart from each other, corrosion is not that this makes it easy to cause reinforcing bar macro
The formation of battery corrosion.When reinforcing bar is under macro cell corrosion state, the electronics of anode reinforcement corrosion release is transferred to yin
Pole reinforcing bar is simultaneously consumed by cathode reinforcing bar, to form the macro cell current for flowing to anode reinforcing bar from cathode reinforcing bar, and then is caused
The corrosion potential of anode reinforcing bar increases the corrosion electricity of (macro cell of anode reinforcing bar polarizes) and cathode reinforcing bar towards positive potential direction
Position reduces (macro cell of cathode reinforcing bar polarizes) towards negative direction.Therefore the corrosion of evaluation Steel Bars in Concrete Structure is considered as it
The polarization characteristic and control mechanism of macro cell corrosion.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, in view of the above-mentioned problems, proposing to be directed to reinforcement in concrete
The detection device and method of macro cell corrosion.It is the configuration of the present invention is simple, easily operated, it can be realized the micro-cell corrosion shape of reinforcing bar
The macro cell current potential between cathode reinforcing bar and anode reinforcing bar is intuitively analyzed in the variation of the alternate cycles of state and macro cell corrosion state
Difference, the polarization ratio of macro cell corrosion electric current, cathode reinforcing bar and anode reinforcing bar and polarization slope, energy effectively evaluating respectively corrode anti-
Inhibitory effect of the shield technology to reinforcing bar macro cell corrosion, additionally it is possible to illustrate the control of reinforcing bar macro cell corrosion under various corrosive environments
Mechanism.
To realize the above-mentioned technical purpose, the following technical solutions are proposed by the present invention:
A kind of armored concrete composite construction, including concrete test block and reinforcing bar, in which: steel-bar arrangement is in concrete test block
Central location；Along concrete test block length direction, reinforcing bar runs through entire concrete test block, and concrete examination is stretched out at reinforcing bar both ends
Block；Duct is set on concrete test block, and the duct is uniformly arranged on one so that concrete test block central location is arranged in
Reinforcing bar is on the circumference in the center of circle, and along concrete test block length direction, entire concrete test block is run through in duct.
In the above-mentioned technical solutions, the quantity in duct is 2-6, preferably 4-6.
In the above-mentioned technical solutions, concrete test block length is 160-200mm, width 60-100mm, is highly 60-
100mm。
In the above-mentioned technical solutions, the diameter in duct is 6-20mm, and the distance of duct centre distance reinforcing steel bar center is 6-
20mm。
By adopting the above technical scheme, reinforcing bar and duct are subjected to position cooperation, structure is simple, easy to use and can be effective
The corrosive environment of simulation reinforcing bar, convenient for the research to reinforcement corrosion.
For the armored concrete composite construction of corrosion test, including armored concrete composite construction, pipeline, conducting wire,
In: armored concrete composite construction, including concrete test block and reinforcing bar, steel-bar arrangement is in the central location of concrete test block；Edge
Concrete test block length direction, reinforcing bar runs through entire concrete test block, and concrete test block is stretched out at reinforcing bar both ends；The two of reinforcing bar
End setting sealant, one end of reinforcing bar is connected with conducting wire；
Duct is set on concrete test block, and the duct is uniformly arranged on one to be arranged in concrete test block center position
The reinforcing bar set is on the circumference in the center of circle, and along concrete test block length direction, entire concrete test block is run through in duct；The two of duct
End is connected with seal for pipe joints respectively；Pipeline is open straight up, and pipeline tapping is higher than concrete test block, to realize that liquid is full of
Duct.
In the above-mentioned technical solutions, the quantity in duct is 2-6, preferably 4-6.
In the above-mentioned technical solutions, concrete test block length is 160-200mm, width 60-100mm, is highly 60-
100mm。
In the above-mentioned technical solutions, the diameter in duct is 6-20mm, and the distance of duct centre distance reinforcing steel bar center is 6-
20mm。
In the above-mentioned technical solutions, screw and washer being set in one end of reinforcing bar, screw passes through washer and is screwed into inside reinforcing bar,
Conducting wire is connected with screw or washer, to realize the connection of the measurement circuit of conducting wire and reinforcing bar；And conducting wire is pierced by sealant.
In the above-mentioned technical solutions, sealant is polystyrene resin layer.
In the above-mentioned technical solutions, the both ends of the reinforcing bar of concrete test block are stretched out in sealant covering, and extend to concrete
Reinforcing bar in test block in oversite concrete test block.
In the above-mentioned technical solutions, in concrete test block, the reinforcing bar length of sealant covering is 30-50mm.
By adopting the above technical scheme, using the pipeline being open straight up to concrete test block load solution (such as chlorine from
Sub- solution, water, mortar etc.), and so that liquid level in pipeline is higher than concrete test block using law of connected vessels, to maintain solution in coagulation
Diffusion in native test block, and then the corrosion condition of follow-on test reinforcing bar, structure is simple, easy to use and being capable of effective simulation steel
The corrosive environment of muscle, convenient for the research to reinforcement corrosion.
A kind of steel reinforced concrete erosion test cell, including armored concrete composite construction, pipeline, conducting wire, in which: reinforcing bar
Composite concrete structure, including concrete test block and reinforcing bar, steel-bar arrangement is in the central location of concrete test block；It is tried along concrete
Block length direction, reinforcing bar runs through entire concrete test block, and concrete test block is stretched out at reinforcing bar both ends；At the both ends of reinforcing bar, setting is close
One end of sealing, reinforcing bar is connected with conducting wire；
Duct is set on concrete test block, and the duct is uniformly arranged on one to be arranged in concrete test block center position
The reinforcing bar set is on the circumference in the center of circle, and along concrete test block length direction, entire 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 liquid reserve tank, and setting pump and flowmeter on pipeline, to realize liquid reserve tank
Middle liquid enters concrete test block by the one end in duct, and the other end flows out and be back to liquid reserve tank, while utilizing pump and flowmeter
Cooperation, realize control and adjustment to liquid flow velocity in pipeline and duct.
In the above-mentioned technical solutions, the quantity in duct is 2-6, preferably 4-6.
In the above-mentioned technical solutions, concrete test block length is 160-200mm, width 60-100mm, is highly 60-
100mm。
In the above-mentioned technical solutions, the diameter in duct is 6-20mm, and the distance of duct centre distance reinforcing steel bar center is 6-
20mm。
In the above-mentioned technical solutions, screw and washer being set in one end of reinforcing bar, screw passes through washer and is screwed into inside reinforcing bar,
Conducting wire is connected with screw or washer, to realize the connection of the measurement circuit of conducting wire and reinforcing bar；And conducting wire is pierced by sealant.
In the above-mentioned technical solutions, sealant is polystyrene resin layer.
In the above-mentioned technical solutions, the both ends of the reinforcing bar of concrete test block are stretched out in sealant covering, and extend to concrete
Reinforcing bar in test block in oversite concrete test block.
In the above-mentioned technical solutions, in concrete test block, the reinforcing bar length of sealant covering is 30-50mm.
By adopting the above technical scheme, using pipeline, pump and flowmeter, to concrete test block load solution, (such as chloride ion is molten
Liquid, water, mortar etc.), and realize and flow velocity is directly controlled, brief introduction controls diffusion of the solution in concrete test block, Jin Erlian
The corrosion condition of continuous test reinforcing bar, structure is simple, corrosive environment easy to use and being capable of effectively simulation reinforcing bar, convenient for steel
The research of muscle corrosion.
The detection device of reinforcement in concrete macro cell corrosion, including two steel reinforced concrete erosion test cells, hold
Container, the setting of two of them steel reinforced concrete erosion test cell are arranged in the same container, and in container
Water；Two steel reinforced concrete erosion test cell structures are identical, and each steel reinforced concrete erosion test cell, including reinforcing bar is mixed
Solidifying soil composite construction, pipeline and conducting wire, two steel reinforced concrete erosion test cells select the first steel reinforced concrete erosion to survey
Try the structure of unit or the structure of second of 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 central location of concrete test block；Along concrete test block length direction, reinforcing bar is through entire mixed
Solidifying soil test block, and concrete test block is stretched out at reinforcing bar both ends；At the both ends of reinforcing bar, sealant, one end and the conducting wire phase of reinforcing bar are set
Even；Duct is set on concrete test block, and the duct is uniformly arranged on one so that concrete test block central location is arranged in
Reinforcing bar is on the circumference in the center of circle, and along concrete test block length direction, entire concrete test block is run through in duct；The both ends in duct point
It is not connected with seal for pipe joints；Pipeline is open straight up, and pipeline tapping is higher than concrete test block, to realize liquid full of hole
Road；
In the structure of second of steel reinforced concrete erosion test cell, armored concrete composite construction, including concrete
Test block and reinforcing bar, steel-bar arrangement is in the central location of concrete test block；Along concrete test block length direction, reinforcing bar is through entire mixed
Solidifying soil test block, and concrete test block is stretched out at reinforcing bar both ends；At the both ends of reinforcing bar, sealant, one end and the conducting wire phase of reinforcing bar are set
Even；Duct is set on concrete test block, and the duct is uniformly arranged on one so that concrete test block central location is arranged in
Reinforcing bar is on the circumference in the center of circle, and along concrete test block length direction, entire concrete test block is run through in duct；The both ends in duct point
It is not connected with seal for pipe joints；Pipeline is connected with liquid reserve tank, and setting pump and flowmeter on pipeline, to realize liquid in liquid reserve tank
Body enters concrete test block by the one end in duct, and the other end flows out and be back to liquid reserve tank, while matching using pump and flowmeter
It closes, realizes the control and adjustment to liquid flow velocity in pipeline and duct；
Switch is set between two steel reinforced concrete erosion test cells, and switch is surveyed with two steel reinforced concrete erosions respectively
The conducting wire tried in unit is connected.
In the above-mentioned technical solutions, the quantity in duct is 2-6, preferably 4-6.
In the above-mentioned technical solutions, concrete test block length is 160-200mm, width 60-100mm, is highly 60-
100mm。
In the above-mentioned technical solutions, the diameter in duct is 6-20mm, and the distance of duct centre distance reinforcing steel bar center is 6-
20mm。
In the above-mentioned technical solutions, screw and washer being set in one end of reinforcing bar, screw passes through washer and is screwed into inside reinforcing bar,
Conducting wire is connected with screw or washer, to realize the connection of the measurement circuit of conducting wire and reinforcing bar；And conducting wire is pierced by sealant.
In the above-mentioned technical solutions, sealant is polystyrene resin layer.
In the above-mentioned technical solutions, the both ends of the reinforcing bar of concrete test block are stretched out in sealant covering, and extend to concrete
Reinforcing bar in test block in oversite concrete test block.
In the above-mentioned technical solutions, in concrete test block, the reinforcing bar length of sealant covering is 30-50mm.
The detection method of reinforcement in concrete macro cell corrosion, the reinforcing bar in a steel reinforced concrete erosion test cell are
Anode reinforcing bar, the reinforcing bar in another steel reinforced concrete erosion test cell is cathode reinforcing bar, is carried out according to the following steps:
Step 1, two steel reinforced concrete erosion test cells are soaked using the water in flat vessel, so that two
The electric 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 into water in whole or in part
In, to simulate the macro cell corrosion of different humidity or underwater concrete, such as will be in two steel reinforced concrete erosion test cells
Concrete test block is immersed in the water 3-5mm.
Step 2, by pipeline into the duct of concrete test block injection experiments liquid；
In step 2, experimental liquid is Chloride Solution or corrosion inhibitor solution.
Step 3, it is connected using measurement device with steel reinforced concrete erosion test cell；
In the step 3, measurement device is corrosion diagnosis instrument or steel bar corrosion instrument or electrochemical workstation or zero electricity
Resistance galvanometer is attached according to the requirement of each measurement device in actual use.
Step 4: disconnecting the conducting wire between cathode reinforcing bar and anode reinforcing bar, persistently measure the micro-cell corrosion electricity of cathode reinforcing bar
Position Emi-cWith micro-cell corrosion current density imi-c, the micro-cell corrosion current potential E of anode reinforcing barmi-aIt is close with micro-cell corrosion electric current
Spend imi-a；
Step 5: the conducting wire between connection cathode reinforcing bar and anode reinforcing bar, the macro cell corrosion list of test constantly cathode reinforcing bar
Position Ema-c, anode reinforcing bar macro cell corrosion current potential Ema-a, the macro cell corrosion electric current that flows between cathode reinforcing bar and anode reinforcing bar
Density ima=ima-c=ima-a；
Step 6: regarding step 4 and step 5 as a cycle period, repeat step 4 and step 5 is tested.
In the step 4, the time of anode reinforcing bar and cathode steel breaking of muscle and tendon open state (i.e. micro-cell corrosion state) is 2-
4 weeks (i.e. one week be 7 days, daily be 24 hours), in order between cathode reinforcing bar and anode reinforcing bar micro-cell corrosion state it is extensive
It is multiple and stable.
In the step 5, the time of anode reinforcing bar and cathode reinforcing bar connection status (i.e. macro cell corrosion) was 2-4 weeks
(i.e. one week is 7 days, is daily 24 hours), in order to flow through the macro cell corrosion electric current between cathode reinforcing bar and anode steel reinforcing bar
Stabilization and the polarized stabilization of macro cell.
In the step 6, it regard step 4 and step 5 as a cycle period, an anode reinforcing bar and cathode steel breaking of muscle and tendon
Open state and an anode reinforcing bar and cathode reinforcing bar connection status form a cycle period, and the time is that 4-8 weeks, (i.e. one week was 7
It, is 24 hours daily).
The present invention has the advantages that the configuration of the present invention is simple, easy to operate, analysis method compared with the existing technology
It is simple and clear, can micro-cell corrosion effect to reinforcing bar and macro cell corrosion effect carry out the evaluation of Comprehensive, can explain
The control model of reinforcing bar macro cell corrosion under bright each corrosive environment.
Detailed description of the invention
Fig. 1 is the structural schematic diagram (1) of the armored concrete composite construction in the present invention.
Fig. 2 is the structural schematic diagram (2) of the armored concrete composite construction in the present invention.
Fig. 3 is the structural schematic diagram of the armored concrete composite construction for corrosion test of the invention.
Fig. 4 is the structural schematic diagram of steel reinforced concrete erosion test cell of the invention.
Fig. 5 is that the cathode reinforcing bar and anode reinforcing bar in the detection device of reinforcement in concrete macro cell corrosion disconnect knot
Structure schematic diagram.
Fig. 6 is that the cathode 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 be duct, and 3 be reinforcing bar, 4 sealants, and 5 be screw, and 6 be plain washer, and 7 be conducting wire, 8
It is flat vessel for plastic conduit, 9,10 be cathode reinforcing bar, and 11 be anode reinforcing bar, and 12 be liquid reserve tank, and 13 be pump, and 14 be flow
Meter, 15 be switch.
Specific embodiment
Present invention is further described in detail with specific embodiment with reference to the accompanying drawing:
As shown in figure 1 and 2, armored concrete composite construction of the invention, including concrete test block and reinforcing bar, in which:
Steel-bar arrangement is in the central location of concrete test block；Along concrete test block length direction, reinforcing bar runs through entire concrete test block, and
Concrete test block is stretched out at reinforcing bar both ends；Duct is set on concrete test block, and the duct is uniformly arranged on one and is existed with setting
The reinforcing bar of concrete test block central location is on the circumference in the center of circle, and along concrete test block length direction, duct is through entire mixed
Solidifying soil test block.
In the above-mentioned technical solutions, the quantity in duct is 4, be located at the surface of reinforcing bar, underface, front-left and
Front-right, diameter 6mm, the distance of duct centre distance reinforcing steel bar center are 8mm；Concrete test block length is 160mm, and width is
80mm is highly 80mm.
As shown in figure 3, the armored concrete composite construction for corrosion test of the invention, including as illustrated in fig. 1 and 2
Armored concrete composite construction, pipeline, conducting wire, in which: armored concrete composite construction, including concrete test block and reinforcing bar, steel
The central location of concrete test block is arranged in muscle；Along concrete test block length direction, reinforcing bar runs through entire concrete test block, and steel
Concrete test block is stretched out at muscle both ends；Sealant is set at the both ends of reinforcing bar, one end of reinforcing bar is connected with conducting wire；
Duct is set on concrete test block, and the duct is uniformly arranged on one to be arranged in concrete test block center position
The reinforcing bar set is on the circumference in the center of circle, and along concrete test block length direction, entire concrete test block is run through in duct；The two of duct
End is connected with seal for pipe joints respectively；Pipeline is open straight up, and pipeline tapping is higher than concrete test block, to realize that liquid is full of
Duct.
In the above-mentioned technical solutions, the quantity in duct is 4, be located at the surface of reinforcing bar, underface, front-left and
Front-right, diameter 6mm, the distance of duct centre distance reinforcing steel bar center are 8mm；Concrete test block length is 160mm, and width is
80mm is highly 80mm.
In the above-mentioned technical solutions, screw and washer being set in one end of reinforcing bar, screw passes through washer and is screwed into inside reinforcing bar,
Conducting wire is connected with screw or washer, to realize the connection of the measurement circuit of conducting wire and reinforcing bar；And conducting wire is pierced by sealant.
In the above-mentioned technical solutions, sealant is polystyrene resin layer, and the steel of concrete test block is stretched out in sealant covering
The both ends of muscle, and extend to the reinforcing bar in concrete test block in oversite concrete test block.In concrete test block, sealant covering
Reinforcing bar length be 30mm.
As shown in figure 4, a kind of steel reinforced concrete erosion test cell, compound including armored concrete as illustrated in fig. 1 and 2
Structure, pipeline, conducting wire, in which: armored concrete composite construction, including concrete test block and reinforcing bar, steel-bar arrangement is in concrete
The central location of test block；Along concrete test block length direction, reinforcing bar runs through entire concrete test block, and coagulation is stretched out at reinforcing bar both ends
Native test block；Sealant is set at the both ends of reinforcing bar, one end of reinforcing bar is connected with conducting wire；
Duct is set on concrete test block, and the duct is uniformly arranged on one to be arranged in concrete test block center position
The reinforcing bar set is on the circumference in the center of circle, and along concrete test block length direction, entire 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 liquid reserve tank, and setting pump and flowmeter on pipeline, to realize liquid reserve tank
Middle liquid enters concrete test block by the one end in duct, and the other end flows out and be back to liquid reserve tank, while utilizing pump and flowmeter
Cooperation, realize control and adjustment to liquid flow velocity in pipeline and duct.
In the above-mentioned technical solutions, the quantity in duct is 4, be located at the surface of reinforcing bar, underface, front-left and
Front-right, diameter 6mm, the distance of duct centre distance reinforcing steel bar center are 8mm；Concrete test block length is 160mm, and width is
80mm is highly 80mm.
In the above-mentioned technical solutions, screw and washer being set in one end of reinforcing bar, screw passes through washer and is screwed into inside reinforcing bar,
Conducting wire is connected with screw or washer, to realize the connection of the measurement circuit of conducting wire and reinforcing bar；And conducting wire is pierced by sealant.
In the above-mentioned technical solutions, sealant is polystyrene resin layer, and the steel of concrete test block is stretched out in sealant covering
The both ends of muscle, and extend to the reinforcing bar in concrete test block in oversite concrete test block.In concrete test block, sealant covering
Reinforcing bar length be 30mm.
As shown in Fig. 1-6, the detection device of reinforcement in concrete macro cell corrosion, including two steel reinforced concrete erosions
Test cell, container, two of them steel reinforced concrete erosion test cell is arranged in the same container, and is containing
It puts and water is set in container；Two steel reinforced concrete erosion test cell structures are identical, and the test of each steel reinforced concrete erosion is single
Member, including armored concrete composite construction, pipeline and conducting wire, two steel reinforced concrete erosion test cells select the first reinforcing bar
The structure of the structure of concrete erosion test cell or second of 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 central location of concrete test block；Along concrete test block length direction, reinforcing bar is through entire mixed
Solidifying soil test block, and concrete test block is stretched out at reinforcing bar both ends；At the both ends of reinforcing bar, sealant, one end and the conducting wire phase of reinforcing bar are set
Even；Duct is set on concrete test block, and the duct is uniformly arranged on one so that concrete test block central location is arranged in
Reinforcing bar is on the circumference in the center of circle, and along concrete test block length direction, entire concrete test block is run through in duct；The both ends in duct point
It is not connected with seal for pipe joints；Pipeline is open straight up, and pipeline tapping is higher than concrete test block, to realize liquid full of hole
Road；
In the structure of second of steel reinforced concrete erosion test cell, armored concrete composite construction, including concrete
Test block and reinforcing bar, steel-bar arrangement is in the central location of concrete test block；Along concrete test block length direction, reinforcing bar is through entire mixed
Solidifying soil test block, and concrete test block is stretched out at reinforcing bar both ends；At the both ends of reinforcing bar, sealant, one end and the conducting wire phase of reinforcing bar are set
Even；Duct is set on concrete test block, and the duct is uniformly arranged on one so that concrete test block central location is arranged in
Reinforcing bar is on the circumference in the center of circle, and along concrete test block length direction, entire concrete test block is run through in duct；The both ends in duct point
It is not connected with seal for pipe joints；Pipeline is connected with liquid reserve tank, and setting pump and flowmeter on pipeline, to realize liquid in liquid reserve tank
Body enters concrete test block by the one end in duct, and the other end flows out and be back to liquid reserve tank, while matching using pump and flowmeter
It closes, realizes the control and adjustment to liquid flow velocity in pipeline and duct；
Switch is set between two steel reinforced concrete erosion test cells, and switch is surveyed with two steel reinforced concrete erosions respectively
The conducting wire tried in unit is connected.
In the above-mentioned technical solutions, the quantity in duct is 4, be located at the surface of reinforcing bar, underface, front-left and
Front-right, diameter 6mm, the distance of duct centre distance reinforcing steel bar center are 8mm；Concrete test block length is 160mm, and width is
80mm is highly 80mm.
In the above-mentioned technical solutions, screw and washer being set in one end of reinforcing bar, screw passes through washer and is screwed into inside reinforcing bar,
Conducting wire is connected with screw or washer, to realize the connection of the measurement circuit of conducting wire and reinforcing bar；And conducting wire is pierced by sealant.
In the above-mentioned technical solutions, sealant is polystyrene resin layer, and the steel of concrete test block is stretched out in sealant covering
The both ends of muscle, and extend to the reinforcing bar in concrete test block in oversite concrete test block.In concrete test block, sealant covering
Reinforcing bar length be 30mm.
The detection method of reinforcement in concrete macro cell corrosion, the reinforcing bar in a steel reinforced concrete erosion test cell are
Anode reinforcing bar, the reinforcing bar in another steel reinforced concrete erosion test cell is cathode reinforcing bar, is carried out according to the following steps:
Step 1, two steel reinforced concrete erosion test cells are soaked using the water in flat vessel, so that two
The electric 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 into water in whole or in part
In, to simulate the macro cell corrosion of different humidity or underwater concrete, such as will be in two steel reinforced concrete erosion test cells
Concrete test block is immersed in the water 3-5mm.
Step 2, by pipeline into the duct of concrete test block injection experiments liquid；
In step 2, experimental liquid is Chloride Solution or corrosion inhibitor solution.
Step 3, it is connected using measurement device with steel reinforced concrete erosion test cell；
In the step 3, measurement device is corrosion diagnosis instrument or steel bar corrosion instrument or electrochemical workstation or zero electricity
Resistance galvanometer is attached according to the requirement of each measurement device in actual use.
Step 4: disconnecting the conducting wire between cathode reinforcing bar and anode reinforcing bar, persistently measure the micro-cell corrosion electricity of cathode reinforcing bar
Position Emi-cWith micro-cell corrosion current density imi-c, the micro-cell corrosion current potential E of anode reinforcing barmi-aIt is close with micro-cell corrosion electric current
Spend imi-a；
Step 5: the conducting wire between connection cathode reinforcing bar and anode reinforcing bar, the macro cell corrosion list of test constantly cathode reinforcing bar
Position Ema-c, anode reinforcing bar macro cell corrosion current potential Ema-a, the macro cell corrosion electric current that flows between cathode reinforcing bar and anode reinforcing bar
Density ima=ima-c=ima-a；
Step 6: regarding step 4 and step 5 as a cycle period, repeat step 4 and step 5 is tested.
In the step 4, the time of anode reinforcing bar and cathode steel breaking of muscle and tendon open state (i.e. micro-cell corrosion state) is 2-
4 weeks (i.e. one week be 7 days, daily be 24 hours), in order between cathode reinforcing bar and anode reinforcing bar micro-cell corrosion state it is extensive
It is multiple and stable.
In the step 5, the time of anode reinforcing bar and cathode reinforcing bar connection status (i.e. macro cell corrosion) was 2-4 weeks
(i.e. one week is 7 days, is daily 24 hours), in order to flow through the macro cell corrosion electric current between cathode reinforcing bar and anode steel reinforcing bar
Stabilization and the polarized stabilization of macro cell.
In the step 6, it regard step 4 and step 5 as a cycle period, an anode reinforcing bar and cathode steel breaking of muscle and tendon
Open state and an anode reinforcing bar and cathode reinforcing bar connection status form a cycle period, and the time is that 4-8 weeks, (i.e. one week was 7
It, is 24 hours daily).
When being detected, corrosion potential, also commonly referred to as half-cell prtential, by corrosion diagnosis instrument or steel bar corrosion instrument
Or electrochemical workstation measures.Micro-cell corrosion current density imi, calculated and obtained by Stern-Geary equation, 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 measure.Macro cell corrosion current density ima, calculated and obtained by following formula: 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, and judgement can be carried out from the flow direction of macro electric current and is obtained.Macro cell corrosion electricity
Flow ImaIt is measured using zero resistance galvanometer.
In the off state, the micro-cell corrosion current potential E of cathode reinforcing bar is measuredmi-cWith micro-cell corrosion current density imi-c、
The micro-cell corrosion current potential E of anode reinforcing barmi-aWith micro-cell corrosion current density imi-a；In connected state, cathode reinforcing bar is measured
Macro cell corrosion unit Ema-c, anode reinforcing bar macro cell corrosion current potential Ema-a, flow between cathode reinforcing bar and anode reinforcing bar
Macro cell corrosion current density ima=ima-c=ima-a。
Detection obtains above-mentioned electric current in a cycle period or several cycle periods and electric potential signal carries out analysis survey
It comments, the location parameter provided is as follows:
Potential difference Δ E under off-state (micro-cell corrosion state) between cathode reinforcing bar and anode reinforcing barcorr1=/
Emi-c-Emi-a/；
Potential difference Δ E under connection status (macro cell corrosion state) between cathode reinforcing bar and anode reinforcing barcorr4=/
Ema-c-Ema-a/；
The polarization potential difference of cathode reinforcing bar is its current potential under disconnection (micro cell) state and connection (macro cell) state
Poor Δ Ecorr2=/Emi-c-Ema-c/；
The polarization potential difference of anode reinforcing bar is its current potential under disconnection (micro cell) state and connection (macro cell) state
Poor Δ Ecorr3=/Ema-a-Emi-a/, and Δ Ecorr1=Δ Ecorr2+ΔEcorr3+ΔEcorr4；
The macro cell corrosion polarization ratio PR of cathode 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 cathode 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)]。
Measurement based on above-mentioned parameter, the control model for evaluating reinforcement in concrete macro cell corrosion are as follows:
(1) cathode 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) control model (i.e. 30% < PR is mixedsteel-c< 60%, 30% < PRsteel-a< 60%, PRcon< 40%)；
(4) concrete impedance control mode (i.e. PRsteel-c≤ 30%, PRsteel-a≤ 30%, PRcon>=40%).
In the detection and analysis evaluation of reinforcement in concrete macro cell corrosion, potential difference is to determine macro cell corrosion electricity
One of the principal element for flowing size, by analyzing potential difference Δ Ecorr1、ΔEcorr2、ΔEcorr3 and Δ Ecorr4 is rotten with macro cell
Lose current density imaRelationship, can preferably evaluate cathode reinforcing bar, anode reinforcing bar and concrete impedance to macro cell corrosion electricity
The influence of stream.Polarize ratio, is obtained by following manner, it may be assumed that using abscissa as Δ Ecorr1, ordinate is Δ EcorrI (i=2,
3,4) scatter plot is drawn, and is fitted with linear function, then the slope of straight line is respectively defined as the polarization ratio of cathode reinforcing bar
The polarization ratio of rate, the polarization ratio of anode reinforcing bar and concrete.Polarize ratio, can evaluate cathode reinforcing bar, anode reinforcing bar and
Relative contribution degree of the concrete impedance to macro cell corrosion；The control of reinforcing bar macro cell corrosion under each corrosive environment can be illustrated
Mode；Reflect that anode and cathode reinforcing bar polarizes under macro cell corrosion state and discharge the ability of electronics and polarization consumption electronics,
The power that cathode reinforcing bar and anode reinforcing bar resist corrosive power under macro cell corrosion state can be evaluated.
In specific implementation, reinforcing bar refer in concrete structure regular reinforcement (such as HPB300, HRB335, HRBF335,
HRB400, HRBF400, HRB500, HRBF500).The strength grade of the concrete is C20~C60.What the present embodiment was selected
It is HPB300 plain bar and strength grade for C30 concrete, specific implementation is as follows.
What the present embodiment was selected is HPB300 plain bar, diameter 20mm, long 180mm, the portion of reinforcing bar both ends 40mm long
Position is wrapped with polystyrene resin sealing, 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.In the HPB300 light of the preset 4 diameter 6mm of aperture position when concreting
Round bar, concrete coagulation harden before extraction to form aperture, after concrete test block hardening after, by the aperture of test block end with
Plastic suction pipe is tightly connected with polystyrene resin.
Strength grade of concrete used is C30, and match ratio is cement: flyash: river sand: rubble: additive: water=1:
0.43:3.11:3.8:0.014:0.6.Cathode concrete test block mixes 0%Cl- (accounting for cementitious material quality), anode when pouring
Concrete test block mixes 3%Cl- (accounting for cementitious material quality) when pouring, so as to show between cathode reinforcing bar and anode reinforcing bar
Significant corrosion potential is poor, convenient under macro cell corrosion state, can clearly observe cathode reinforcing bar and anode reinforcing bar
Polarization behavior.
Cathode concrete test block and anode concrete test block demould after pouring 1 day, then proceed to be placed on 20 DEG C of perseverance
It carries out conserving in water to age in greenhouse.It takes out later, a cathode test block and an anode test block is placed in containing a small amount of
In the flat plastic ware of water, the water in vessel is just above the lower edge 3-5mm or so of test block.Then it is put at room temperature
It sets 2 weeks, the humidity of test block is made to keep relative stability with indoor humidity.
Corrosion diagnosis device used in the present embodiment is the CM-SE1 type corrosion diagnosis device of Nippon Steel Ji Yan commercial firm exploitation, is made
Zero resistance electric current is calculated as the HM-103A type zero resistance galvanometer of Beidou electrician Co., Ltd..
Firstly, the conducting wire of cathode reinforcing bar test block and the conducting wire of anode reinforcing bar test block are first in an off state 2 weeks, cathode at this time
Reinforcing bar and anode reinforcing bar are respectively at micro-cell corrosion state；Cathode reinforcing bar and yin are measured respectively using CM-SE1 corrosion diagnosis device
Corrosion potential E of the pole reinforcing bar under micro cell statemi-cAnd Emi-a, erosion resistance Rp-cAnd Rp-aAnd (i.e. concrete tries mortar
Block) electrical impedance Rcon；The time interval of measurement is 1 day, to obtain the when varied curve of each corrosion parameter；In measurement process, satisfy
Water absorbent cotton is placed between corrosion diagnosis device probe and concrete test block surface, to ensure good current conductivity；Cathode
The corrosion electric current density of reinforcing bar and cathode reinforcing bar in the off state is referred to as micro-cell corrosion current density imi-cAnd imi-a, can
It is calculated and is obtained by Stern-Geary equation, it may be assumed that imi=B/Rp, in formula, imiIt is micro-cell corrosion 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
Value is 52mV when in passive state.Test measurement data are shown in Table 1.
Then, the conducting wire of cathode reinforcing bar test block and the conducting wire of anode reinforcing bar test block again are at connection status 2 weeks, at this time cathode
Reinforcing bar and anode reinforcing bar are respectively at macro cell corrosion state；Cathode reinforcing bar and yin are measured respectively using CM-SE1 corrosion diagnosis device
Corrosion potential E of the pole reinforcing bar under macro cell statema-cAnd Ema-a；It is measured using HM-103A type zero resistance galvanometer and flows through cathode
Electric current between reinforcing bar and anode reinforcing bar, i.e., macro electric current；Macro cell corrosion current density is calculated by following formula and is obtained, it may be assumed that ima=ima-c
=ima-a=Ima/Aa, in formula, imaIt is macro cell corrosion 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 be defined as discharge electronics reinforcing bar, can from the flow direction of macro electric current into
Row judgement obtains；The time interval of measurement is 1 day, to obtain the when varied curve of each corrosion parameter.
Off-state 2 weeks and connection status 2 weeks, this was defined as 1 test cycle for 4 weeks, and the present embodiment is carrying out 6 examinations
After testing circulation, the nitrite ion solution (NaNO of 8mol/L is injected into the aperture of anode test block2), then proceed by test
It is recycled to 20 times.Test measurement data are shown in Table 1.
Calculate the potential difference Δ E under (micro cell) state of disconnection between cathode reinforcing bar and anode reinforcing barcorr1=/Emi-c-
Emi-a/, connect the potential difference Δ E under (macro cell) state between cathode reinforcing bar and anode reinforcing barcorr4=/Ema-c-Ema-a/, yin
The polarization potential difference of pole reinforcing bar is its potential difference Δ E under disconnection (micro cell) state and connection (macro cell) statecorr2
=/Emi-c-Ema-c/, the polarization potential difference of anode reinforcing bar is it under disconnection (micro cell) state and connection (macro cell) state
Potential difference Δ Ecorr3=/Ema-a-Emi-a/, the macro cell corrosion polarization ratio PR of cathode 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 cathode 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)].Calculated result is shown in Table 1.
Analyze potential difference Δ Ecorr1、ΔEcorr2、ΔEcorr3 and Δ Ecorr4 and macro cell corrosion current density imaPass
System evaluates the influence of cathode reinforcing bar, anode reinforcing bar and concrete (mortar) impedance to macro cell corrosion electric current.As shown in Table 1, when
After injecting the nitrite ion solution of 8mol/L in the aperture of anode test block, as macro cell potential difference is gradually reduced, macro cell
Corrosion electric current density also decreases, and nitrite ion confirms the inhibitory effect of reinforcing bar macro cell corrosion.
Analysis polarization ratio, the phase of evaluation cathode reinforcing bar, anode reinforcing bar and concrete (mortar) impedance to macro cell corrosion
To percentage contribution, the control model of reinforcing bar macro cell corrosion under the corrosive environment is illustrated.As shown in Table 1, cathode in the present embodiment
The polarization ratio of reinforcing bar is larger, and main contributions are played in macro cell corrosion, therefore the macro cell corrosion of reinforcing bar controls in the present embodiment
Mode is the control of cathode reinforcing bar.
Analysis polarization slope, evaluates anode reinforcing bar and cathode reinforcing bar polarizes under macro cell corrosion state and discharges electronics and pole
Change the ability of consumption electronics, evaluates cathode reinforcing bar and anode reinforcing bar resists the power of corrosive power under macro cell corrosion state.
As shown in Table 1, after injecting the nitrite ion solution of 8mol/L in the aperture of anode test block, the polarization slope of anode reinforcing bar by
Gradually counterclockwise increase, the rejection ability of macro cell corrosion is gradually increased, nitrite ion is to reinforcing bar macro cell corrosion
Inhibitory effect is confirmed.
1 embodiment data of table and interpretation of result
Note: the present embodiment after carrying out 6 test cycles, into the aperture of anode test block inject 8mol/L nitrous acid from
Sub- solution (NaNO2), test cycle is then proceeded by 20 times.Data Emi-c, Emi-a for being provided in table, Rp-c, Rp-a,
Rcon, Ema-c, Ema-a, ima, ima-c, ima-a are the average value of each stage institute measured data.
The above, only the embodiment of the present invention, are not intended to limit the scope of the present invention.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (6)
1. the detection device of reinforcement in concrete macro cell corrosion, it is characterised in that: tested including two steel reinforced concrete erosions
Unit, container, two of them steel reinforced concrete erosion test cell are arranged in the same container, and hold holding
Water is set in device；Two steel reinforced concrete erosion test cell structures are identical, and each steel reinforced concrete erosion test cell, packet
Armored concrete composite construction, pipeline and conducting wire are included, two steel reinforced concrete erosion test cells select the first reinforced concrete
The structure of native corrosion test unit or the structure of second of 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 central location of concrete test block；Along concrete test block length direction, reinforcing bar runs through entire concrete
Test block, and concrete test block is stretched out at reinforcing bar both ends；Sealant is set at the both ends of reinforcing bar, one end of reinforcing bar is connected with conducting wire；?
Duct is set on concrete test block, and the duct is uniformly arranged on one and is with the reinforcing bar that concrete test block central location is arranged in
On the circumference in the center of circle, and along concrete test block length direction, entire concrete test block is run through in duct；The both ends in duct respectively with pipe
Road sealing is connected；Pipeline is open straight up, and pipeline tapping is higher than concrete test block, to realize liquid full of duct；
In the structure of second of steel reinforced concrete erosion test cell, armored concrete composite construction, including concrete test block
And reinforcing bar, steel-bar arrangement is in the central location of concrete test block；Along concrete test block length direction, reinforcing bar runs through entire concrete
Test block, and concrete test block is stretched out at reinforcing bar both ends；Sealant is set at the both ends of reinforcing bar, one end of reinforcing bar is connected with conducting wire；?
Duct is set on concrete test block, and the duct is uniformly arranged on one and is with the reinforcing bar that concrete test block central location is arranged in
On the circumference in the center of circle, and along concrete test block length direction, entire concrete test block is run through in duct；The both ends in duct respectively with pipe
Road sealing is connected；Pipeline is connected with liquid reserve tank, and setting pump and flowmeter on pipeline, to realize liquid in liquid reserve tank by hole
The one end in road enters concrete test block, and the other end flows out and be back to liquid reserve tank, while using the cooperation of pump and flowmeter, realizing
Control and adjustment to liquid flow velocity in pipeline and duct；
Switch is set between two steel reinforced concrete erosion test cells, and switch is single with two steel reinforced concrete erosion tests respectively
Conducting wire in member is connected.
2. the detection device of reinforcement in concrete macro cell corrosion as described in claim 1, it is characterised in that: the duct
Quantity be 2-6, the diameter in duct is 6-20mm, and the distance of duct centre distance reinforcing steel bar center is 6-20mm.
3. the detection device of reinforcement in concrete macro cell corrosion as described in claim 1, it is characterised in that: the coagulation
Native test block length is 160-200mm, width 60-100mm, is highly 60-100mm.
4. the detection device of reinforcement in concrete macro cell corrosion as described in claim 1, it is characterised in that: the one of reinforcing bar
End setting screw and washer, screw pass through washer and are screwed into inside reinforcing bar, and conducting wire is connected with screw or washer, with realize conducting wire and
The connection of the measurement circuit of reinforcing bar；And conducting wire is pierced by sealant.
5. the detection device of reinforcement in concrete macro cell corrosion as described in claim 1, it is characterised in that: the sealing
Layer is polystyrene resin layer, and the both ends of the reinforcing bar of concrete test block are stretched out in sealant covering, and are extended in concrete test block
Reinforcing bar in oversite concrete test block, in concrete test block, the reinforcing bar length of sealant covering is 30-50mm.
6. application of the detection device in reinforcement in concrete macro cell corrosion detection as described in one of claim 1-5.
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| CN110823983A (en) * | 2019-10-08 | 2020-02-21 | 九州职业技术学院 | Real-time monitoring device and detection method for reinforced bar galvanic couples in concrete |
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| CN1438478A (en) * | 2003-03-20 | 2003-08-27 | 上海交通大学 | Method for detecting corrosion of concrete bar in reinforced concrete |
| CN202101924U (en) * | 2011-04-25 | 2012-01-04 | 青岛理工大学 | Embedded reinforcement corrosion monitoring system |
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| CN1438478A (en) * | 2003-03-20 | 2003-08-27 | 上海交通大学 | Method for detecting corrosion of concrete bar in reinforced concrete |
| CN202101924U (en) * | 2011-04-25 | 2012-01-04 | 青岛理工大学 | Embedded reinforcement corrosion monitoring system |
| JP2014013173A (en) * | 2012-07-04 | 2014-01-23 | Sumitomo Osaka Cement Co Ltd | Metal corrosion testing device and metal corrosion testing method |
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