• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention describes a sensor, as well as a network of several sensors, for determining corrosión in a reinforced concrete structure, each sensor comprising a support for coupling it to a bar of a reinforcement of a concrete structure; a sensor element attached to the frame by the support; a temperature sensor; conduction and connection elements for electrically connecting and isolating the armature, the sensor element and the temperature sensor; and an outer connector connected to the sensor element and to the reinforcement by means of the conduction and connection elements and formed by a connector inside a connection box embedded in the surface of the concrete structure. The invention also discloses a method and a related computer program for determining corrosión in a reinforced concrete structure by using the sensors of the invention. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2545669A1
    申请号:ES201530614
    申请日:2015-05-06
    公开日:2015-09-14
    发明作者:Miguel ALCAÑIZ FILLOL；Román BATALLER PRATS；José Manuel GANDÍA ROMERO；José Enrique RAMÓN ZAMORA；Juan Soto Camino；Manuel Octavio VALCUENDE PAYÁ
    申请人:Universidad Politecnica de Valencia；
    IPC主号:
    专利说明:

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    P201530614
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    of investigation with test pieces to be able to deepen in the knowledge of the processes of corrosion of the reinforcements embedded in concrete).
    The sensor according to the preferred embodiment of the present invention, represented in Figures 1 and 2, comprises:
    -A support (10) for attaching the sensor to a reinforcement bar (12) of the reinforced concrete structure. The support (10) is preferably manufactured with ceramic or polymeric materials (rigid or flexible) and is designed with an appropriate geometry that arranges the sensor in the most appropriate position with respect to the metallic reinforcement (12) to be controlled.
    -A sensor element (14) attached to the armature (12) by means of the support (10). This sensor element (14) acts as a working electrode during voltammetric measurements
    or potentiometers made according to the method of the present invention, as will be described hereinafter. It is formed by a small fragment of the same material as the armor placed on site, of known surface. According to the preferred embodiment, the surface of the sensor element (14) is 5 to 30 cm2.
    -A temperature sensor (16), which can be, for example, a thermocouple, NTC, PTC, RTP or a semiconductor temperature sensor, superficially adhered to the support (10) with resins (for example LM50B), or embedded in the own support (10).
    - Conduction and connection elements (18) that allow the armature (12), the sensor element (14) and the temperature sensor (16) to be electrically connected and insulated as necessary and to transport the signal to a
    P201530614
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    outer connector
    -A metal connection clamp (24) to connect the armature (12) with the conduction and connection elements. The clamp (24) can be adjusted by means of a mechanical snap closure or screwed with an inert material constructed for example of externally insulated stainless steel, nylon fasteners or polymers of similar characteristics or nylon flanges. Inside it contains two semicircular metal connectors attached to an insulated cable, which with the pressure exerted by the clamp (24) guarantee electrical contact between the armature (12) and a connection box (22). The support
    (10) described above protects the clamp (24) against moisture.
    -An external connector connected to the sensor element (14) and to the armature (12) by means of the conduction and connection elements (18). It is formed by a connector (20) inside a small connection box (22), embedded in the surface of the concrete structure. Information can be obtained by means of a jack connected to a measuring device that will obtain the reading of the local temperature, the corrosion potential and the corrosion intensity of the sensor. It can also have a mechanism for connecting a reference electrode.
    Obviously, the geometry of the sensor can vary in various embodiments of the present invention depending on the point of application and the diameter of the reinforcements to ensure good contact with them.
    To constitute a sensor network, it is sufficient to install a plurality of the sensors described hereinbefore in a respective plurality of locations in the structure's frame.
    P201530614
    06-11-2015
    of reinforced concrete. In this way, as many parts of the structure as desired can be monitored in order to know the general state of the structure.
    It is possible to integrate a single or several sensor elements in the same area by means of a common connection, adopting various configurations (matrix, aligned, etc.) that allow to register simultaneously and in several points the variations of local properties that exist inside the interior reinforced concrete.
    An example of installation of a sensor according to the preferred embodiment of the present invention in a reinforcement (12) within a reinforced concrete structure is shown in Figure 3. For simplicity, only one sensor is shown in this figure, but the person skilled in the art will understand that a plurality of sensors can be installed in the same armature (12) to constitute the sensor network described above.
    Next, the operation of the sensor according to the preferred embodiment of the present invention will be described. The external connector acts as an electrical switch that allows the element to be connected and disconnected
    (14) sensor to the metal frame (12) to be controlled. In this way, it can be in a normal state (with connection element (14) metal sensor-armor (12)), and a sensing state (disconnection of the element
    (14) sensor-armor (12) metal.
    The normal state implies the direct and local connection of the sensor element (14) in an area of the metal reinforcement (12) within the reinforced concrete structure. In this situation, it participates in the physicochemical conditions of its surroundings, acquiring an electrical potential that is the local of that region of the armor (12), and that must be imposed by the physicochemical parameters of the
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    the armor and a sequence is started in which the current through the system is measured until it is below a certain threshold (set in the equipment configuration).
    After applying each pulse the microcontroller measures the current until the variation of its value in 5 consecutive samples is below a certain threshold. At that time the current value is considered stable. The duration of each of the pulses applied will depend on the time it takes for the current to stabilize. The values of the temporal evolution of the current as well as the stabilization value (which is calculated by averaging the last 5 measurements) are stored in non-volatile memory.
    The application of the above pulse train serves mainly to calculate the polarization resistance and the corrosion intensity. For this, the equivalent circuit that best describes the corrosion process that occurs in the structure for the system with 2 electrodes (see Figure 6 attached) is considered, from which equations of the intensity that circulates through it are developed . The total current is the sum of the current derived from the load transfer (faradic current If) and the current due to the reorganization of charges in the double electrical layer (non-faradic current Idl). Therefore, the intensity-time curve obtained by applying the potentiostatic pulse is the sum resulting from the intensity-time curves of the faradic and non-faradic current.
    Solving the circuit of Figure 6, the following two equations are obtained, which allow the evaluation of the faradic and non-faradic contribution of the anodic and cathodic currents that pass through the sensor element and the auxiliary electrode as a function of time.
    P201530614
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    image18
    5
    The total intensity is equal to the sum of the four terms that appear in the previous equations. The subscript that appears in the first WE equation refers to the intensity that the electrode crosses
    10 work while the subscript EA refers to the auxiliary electrode. By adjusting the experimental data of the intensity as a function of the time of the pulses of +/- 10, +/- 70 and +/- 140 mV to the proposed equations, we obtain
    15 the numerical value of each of the elements that form the equivalent circuit for the electrode that are used to calculate the following parameters: Corrosion density taking the resistance of
    polarization (Rp) of the system, icorr (Rp): From
    20 values of Rp and Rs obtained by adjusting the +10 mV and -10 mV pulses to the equivalent circuit, Rp 'is calculated for the anodic (equation 4) and cathodic (equation 5) branches, which have the same value (equation 6). With equation 7, the total Rp ’is calculated.
    25
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    (4)
    (5)
    P201530614
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    image20
    (6)
    (7) From this total Rp ’value, the infinite time stabilization intensity is calculated
    5 corresponding to the positive and negative pulse according to equation 8:
    i = E / R’pTOTAL (8) where E is the applied potential over 10 OCP, in this case +0.01 and -0.01 V respectively. The values of positive (+10 mV) and negative (-10 mV) pulse versus the corresponding overpotential are represented below, and the inverse of the slope of the line that joins them is the final Rp 'that must be considered . Simplified (without adjustment of data to the equivalent circuit) this parameter can also be calculated from the Rp 'of the anodic and cathodic branch (equations 4 and 5) taking the Rp calculated according to equation 9 taking the stabilization intensity (IE ) 20 average of the +10 and -10 mV pulses, replacing them in equation 9:
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    (9)
    25 The corrosion current value is obtained using the Stern-Geary formula shown in the following equation 10:
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    权利要求:
    Claims (1)
    [1]
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20120043981A1|2010-08-19|2012-02-23|Southwest Research Institute|Corrosion Monitoring of Concrete Reinforcement Bars Using Distributed Node Electrodes|
    JP4754998B2|2006-03-13|2011-08-24|鹿島建設株式会社|Reinforcement corrosion prediction method|
    JP2011089871A|2009-10-22|2011-05-06|Seiko Epson Corp|Embedded measurement system and embedded measurement method|
    JP6018467B2|2012-09-20|2016-11-02|ショーボンド建設株式会社|Reference electrode and natural potential measurement method|EP3948169A1|2019-04-03|2022-02-09|Pouria Ghods|Embedded sensor devices and methods|
    CN111912686B|2020-08-11|2021-08-17|中南大学|Concrete hydrothermal curing and stress-strain integrated testing device and testing method thereof|
    法律状态:
    2016-01-19| FG2A| Definitive protection|Ref document number: 2545669 Country of ref document: ES Kind code of ref document: B2 Effective date: 20160119 |
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    优先权:
    申请号 | 申请日 | 专利标题
    ES201530614A|ES2545669B2|2015-05-06|2015-05-06|Sensor, sensor network, method and computer program to determine corrosion in a reinforced concrete structure|ES201530614A| ES2545669B2|2015-05-06|2015-05-06|Sensor, sensor network, method and computer program to determine corrosion in a reinforced concrete structure|
    PCT/ES2016/070346| WO2016177929A1|2015-05-06|2016-05-05|Sensor, sensor network, method and computer program for determining the corrosion in a reinforced concrete structure|
    EP16789359.3A| EP3293509B1|2015-05-06|2016-05-05|Method for determining the corrosion in a reinforced concrete structure|
    ES16789359T| ES2868874T3|2015-05-06|2016-05-05|Method to determine corrosion in a reinforced concrete structure|
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