Śledzenie stanu betonu za pomocą pomiarów przewodnictwa elektrycznego in situ

• Autorzy: Rajabipour F. , Weiss J.

Warianty tytułu

EN

Material health monitoring of concrete by means of in situ electrical conductivity measurements

• Języki publikacji: PL

Abstrakty

PL

Dla oceny stanu trwałości betonu ważne znaczenie mają pomiary właściwości materiału to jest porowatości, przepuszczalności, współczynnika dyfuzji in situ. W tym celu pomiary przewodnictwa elektrycznego okazały się bardzo przydatne do śledzenia właściwości transportowych i rozwoju uszkodzeń wewnątrz betonu. Jednak na właściwości elektryczne betonu ma równocześnie wpływ szereg parametrów (np. hydratacja, wilgotność, zmiany temperatury) i z tego powodu pojedynczy pomiar przewodnictwa może nie pozwalać na scharakteryzowanie betonu w warunkach polowych. W artykule zaproponowano kombinację czterech pomiarów (przewodnictwo betonu, przewodnictwo cieczy w porach, wewnętrzna wilgotność i temperatura), która jest potrzebna do oceny właściwości materiału i betonu w warunkach polowych. Opracowano nowy układ do śledzenia stanu materiału w oparciu o wykorzystanie pomiarów czterech oddzielnych sensorów. Ten układ sensorów może prowadzić pomiary in situ szeregu właściwości materiału (na przykład wewnętrzną wilgotność i stężenia jonów) w betonie. Ten artykuł prezentuje sposób postępowania stosowany do opracowania prototypów trzech sensorów opartych na przewodnictwie i mierzących przewodnictwo betonu, roztworu w porach oraz względnej wilgotności.

EN

To assess the health and durability performance of concrete, in situ measurement of material properties (e.g., porosity, permeability, diffusion coefficient) is important. In this regard, electrical conductivity measurements have been shown to be effective in monitoring transport properties and damage development inside concrete. However, properties of concrete are simultaneously influences by several parameters (e.g., hydration, moisture, and temperature changes) and as such, a single measurement of conductivity may not be reliable for estimating the properties of field concrete. This paper describes that a combination of four measurements (concrete conductivity, pore solution conductivity, internal moisture or humidity, and temperature) is needed to accurately estimate the material properties of concrete in the field. A new material health monitoring system is developed based on this premise that combines the measurements from four separate sensors. This sensing system can provide an insitu measurement of several material properties (e.g., permeability, ion diffusivity) and state parameters (e.g., internal humidity, ion concentrations) of concrete. This paper presents the procedure used for the development of the prototype of three electrical conductivity-based sensor measuring concrete conductivity, pore solution conductivity, and relative humidity.

Słowa kluczowe

PL

beton; stan techniczny; badanie nieniszczące; badanie in situ; przewodnictwo elektryczne; diagnoza; prognozowanie trwałości; sensor; ciecz porowa; zawartość wilgoci; temperatura; układ sensorów

• Wydawca: Fundacja Cement, Wapno, Beton
• Czasopismo: Cement Wapno Beton
• Rocznik: 2007
• Tom: R. 12/74, nr 2
• Strony: 76--92
• Opis fizyczny: Bibliogr. 43 poz., il.

Twórcy

autor

Rajabipour F.

autor

Weiss J.

• Purdue University, School of Civil Engineering, West Lafayette, USA

Bibliografia

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