The Corrosion Status of Reinforced Concrete Structure Monitoring by Impact-Echo Method

2014 ◽  
Vol 875-877 ◽  
pp. 445-449 ◽  
Author(s):  
Kristýna Šamárková ◽  
Zdeněk Chobola ◽  
Daniela Štefková
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Structure ◽  
Response Signal ◽  
Nacl Solution ◽  
Impact Echo ◽  
Structure Monitoring ◽  
Impact Echo Method ◽  
Dominant Frequencies

The paper deals with the study of dominant frequencies of an Impact-Echo method response signal obtained from a reinforced concrete beam with a steel rod diameter of 8 mm. Tension pulse was produced in axis of the rod at one end and detected in axis at opposite end of rod. Dominant frequencies of the response signal will be the main criterions for the reinforced concrete rebar corrosion progress. The article presents the results of measurements obtained after 12 months controlled degradation in aqueous NaCl solution. The results were compared with measurements of electrical resistance of reinforcing steel by using the Thomson double bridge.

Using of Impact-Echo Methods to Assessment of Reinforced Concrete Structures Corrosion

2013 ◽  
Vol 446-447 ◽  
pp. 1400-1404 ◽  
Author(s):  
Kristýna Šamárková ◽  
Zdeněk Chobola ◽  
Daniela Štefková
Keyword(s):  
Reinforced Concrete ◽  
Electrical Resistance ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Response Signal ◽  
Nacl Solution ◽  
Impact Echo ◽  
Rebar Corrosion ◽  
Impact Echo Method ◽  
Dominant Frequencies

The paper deals with the study of dominant frequencies of an Impact-Echo method response signal obtained from a reinforced concrete beam with a steel rod diameter of 8 mm. Tension pulse was produced in axis of the rod at one end and detected in axis at opposite end of rod. Dominant frequencies of the response signal will be the main criterions for the reinforced concrete rebar corrosion progress. The article presents the results of measurements obtained after 12 months controlled degradation in aqueous NaCl solution. The results were compared with measurements of electrical resistance of reinforcing steel by using the Thomson double bridge.

Monitoring of Reinforced Concrete Structure Corrosion by Using Impact-Echo Method

2014 ◽  
Vol 1000 ◽  
pp. 239-242 ◽  
Author(s):  
Kristýna Šamárková ◽  
Daniela Štefková ◽  
Zdeněk Chobola
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Acoustic Method ◽  
Reinforced Concrete Beam ◽  
Dominant Frequency ◽  
Reinforced Concrete Structure ◽  
Main Criterion ◽  
Impact Echo ◽  
Opposite Position ◽  
Impact Echo Method

This study deals with frequency inspection of response signal which was obtained from a reinforced concrete beam. Impact-Echo method was used for finding the dominant frequency which is the main criterion for condition assessment of reinforced concrete. The results of acoustic method were compared with measurements of electrical resistance of reinforcing steel by using the Thomson double bridge. The concrete beam with a steel rod diameter of 6 mm was tested. Tension pulse was produced in the centre of the concrete beam and detected in opposite position of the concrete beam.

Impact-Echo Methods to Assessment Corrosion of Reinforced Concrete Structures

2014 ◽  
Vol 627 ◽  
pp. 268-271 ◽  
Author(s):  
Kristýna Šamárková ◽  
Zdeněk Chobola ◽  
Daniela Štefková ◽  
Ivo Kusák
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
Signal Analysis ◽  
Damping Factor ◽  
Reinforced Concrete Structures ◽  
Reinforced Concrete Structure ◽  
Nacl Solution ◽  
Frequency Signal ◽  
Impact Echo ◽  
Dominant Frequencies

The aim of this paper is to evaluate the corrosion of reinforced concrete structure. To assess the state of corrosion we used frequency signal analysis, where we observed the changes in dominant frequencies and growth of damping factor λ. Tension pulse was produced in axis of the rod at one end and detected in axis at opposite end of rod. Diameter of steel rod was 8 mm. The article presents the results of measurements obtained during 24 months controlled degradation in aqueous NaCl solution.

Calculation of Ultimate Bearing Capacity of Prestressed Steel Reinforced Concrete Structure under Fire

2011 ◽  
Vol 250-253 ◽  
pp. 2857-2860 ◽  
Author(s):  
Yu Zhuo Wang ◽  
Chuang Guo Fu
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Fire Resistance ◽  
Concrete Structure ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Ultimate Bearing Capacity ◽  
Reinforced Concrete Structure ◽  
Steel Reinforced Concrete ◽  
Resistance Performance

Prestressed steel reinforced concrete structure, compared with other concrete structure has its unique advantages. So it is mainly used in large span and conversion layers. With the popularization of this structure,more attention should be payed on fire resistance performance. On the basis of reasonable assume,two steps model is used as concrete high strength calculation model. Simplified intensity decreased curve is used as rebar,steel and prestressed. Two ultimate bearing capacity formulas of prestressed steel reinforced concrete beam are established. One is for the beam whose tensile area is under fire, the other is for the beam whose compression area is under fire. Prestressed steel reinforced concrete structure has both prestressed concrete structure’s advantages and steel reinforced concrete structure ’s advantage. Steel reinforced concrete is used to improve the bearing capacity of the structure. Prestressed steel is used to improve the ultimate state of structure’s performance during normal use. Thereby structure’s performance is better to play. There are many similarities between prestressed steel reinforced concrete structure and steel reinforced concrete structure about fire resistance performance. Because of prestressed steel reinforced concrete structure’s own characteristics, there are still many problems about fire resistance. This paper mainly presented bending terminal bearing capacity of prestressed steel reinforced concrete beam under fire. Established simplified formulae for calculation, it is meet the engineering accuracy requirement.

Effect of Thermal Loading on Selected Parameters of Reinforced Concrete Obtained by Acoustic NDT Method

2019 ◽  
Vol 296 ◽  
pp. 131-136
Author(s):  
Iveta Plšková ◽  
Michal Matysík ◽  
Zdeněk Chobola
Keyword(s):  
Reinforced Concrete ◽  
Thermal Loading ◽  
Acoustic Method ◽  
Frequency Spectra ◽  
Impact Echo ◽  
Steel Reinforced Concrete ◽  
Before And After ◽  
Non Destructive ◽  
Impact Echo Method ◽  
Dominant Frequencies

The paper presents the results of experiments carried out on test samples made from reinforced concrete. Within this experiment, concrete beams with steel reinforcement in the middle were made. The concrete samples were tested by a non-destructive acoustic Impact-echo method before and after high temperature loading (after cooling to room temperature). We focused on the dominant frequencies shift in the frequency spectra obtained by this method. The aim was to assess the ability of aforementioned acoustic method to detect the thermal damage of steel reinforced concrete.

The Effect of Steel Fiber as Additional Reinforcement in the Reinforced Concrete Beam

2015 ◽  
Vol 754-755 ◽  
pp. 373-377 ◽  
Author(s):  
Mustaqqim Abdul Rahim ◽  
Zuhayr Md Ghazaly ◽  
Muhammad Azizi Azizan ◽  
Fazdliel Aswad Ibrahim ◽  
Norlia Mohamad Ibrahim ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
Concrete Beam ◽  
Steel Fiber ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Structure ◽  
New Materials ◽  
Engineering Material ◽  
Synthetic Fibers ◽  
Steel Bar

In the normal practice in the reinforced concrete design, the main reinforcement steel bar and links was used to fabricate the concrete structure. However new materials such as steel fiber has been introduced as the reinforcement to the reinforced concrete structure [1]. Nowadays, the application of fiber in concrete increase slightly as an engineering material demands. Fibers have distinctive of geometry, size and material. The characteristics and properties of fiber influence the properties concrete. Steel, glass and synthetic fibers were used in concrete in 1960s because of the difficulty to handle the asbestos fiber [2].

scholarly journals Fire Analysis of Simply Supported Reinforced Concrete Beam

2021 ◽  
Vol 1197 (1) ◽  
pp. 012079
Author(s):  
Virendra Hatwar ◽  
Kuldeep Dabhekar ◽  
B.k. Singh ◽  
shrikant solanki
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Behavior Pattern ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Structure ◽  
Fire Hazards ◽  
Simply Supported ◽  
Finite Element Software ◽  
Standard Fire ◽  
Calculation Methodology

Abstract This paper presents analysis of simply supported reinforced concrete beam exposed to standard fire. Eurocode standard provides recommendations for analysis of reinforced concrete structure under fire. The thermal and structural responses of structure are calculated using commercially available software ANSYS. An advance calculation methodology must be implemented to estimate the behavior of structure and to understand thermal and mechanical properties of material during fire. These include transient thermal as well as structural analysis of structure. Finite element software ANSYS is capable to conducting thermal analysis as per defined material properties. It is important to study effect at elevated temperature on structure to understanding the behavior pattern and decrease the losses caused fire hazards.

Ultrasonic Damage Measurement in Reinforced Concrete Beams

2005 ◽  
Vol 293-294 ◽  
pp. 695-702 ◽  
Author(s):  
Rogerio Bairrao ◽  
Marcin Chrzanowski ◽  
Joaquim Duque ◽  
Pawel Latus
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Limit State ◽  
National Laboratory ◽  
Test Procedure ◽  
Vertical Direction ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Shaking Table ◽  
Reinforced Concrete Structure

In several situations the failure of a reinforced concrete structure is preceded by a gradual deterioration of the materials which can be recognised by measuring the change of their physical properties [1]. The main purpose of the destructive tests described in the present paper was to obtain an evaluation of the damage evolution in a reinforced concrete beam, submitted to harmonic displacements imposed by means of a shaking table. A reinforced concrete beam, with two different spans, was designed to sustain a static load of a mass located at the centre of the longer span. Ten identical specimens were prepared and tested at the LNEC (National Laboratory for Civil Engineering, Lisbon) shaking table facility [2]. This paper presents tests, which have been performed in the frame of the European Commission programme ECOEST/PECO (European Consortium of Earthquake Shaking Tables / Central and Eastern European Countries extension). The beams were fixed to the shaking table and submitted to a sinusoidal displacement in the vertical direction, with a pre-established duration and constant amplitude. The tests were carried out by successive stages of increasing amplitudes, until the collapse of each beam was reached. The tests aimed to give an evaluation of the loading history influence on the occurrence of the critical state. During the tests, displacements and accelerations were continuously recorded at several points of the structures, along with ultrasonic measurements taken at different directions, before and after each successive stage. In the present paper the design of the specimens is given. The instrumentation plan, the test setup and the test procedure are also described. Finally, the most relevant results are shown followed by the formulation of a global damage law to predict the limit state of the beams.

Stress Analysis of Tall Steel Reinforced Concrete Cantilever Beam

2012 ◽  
Vol 151 ◽  
pp. 286-290 ◽  
Author(s):  
Ke Wei Ding ◽  
Ai Yu Yang
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structure ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Structure ◽  
Steel Reinforced Concrete ◽  
Site Monitoring ◽  
Stress And Strain Distribution ◽  
Day By Day ◽  
Theoretical Results

With economic prosperity and social development, various kinds of unconventional concrete structure increases day by day, steel reinforced concrete structure has been widely used. The paper demonstrated the Hefei Yangtze-crossing Campaign Memorial Project, by comparing theoretical results with site monitoring data analysis results, summarized the variation of stress and strain distribution in the cantilever truss steel reinforced concrete beam structure. The main content of this paper introduced the study of steel reinforced concrete with the project to make conclusions that they would be significance to apply in the future similar projects for guidance and reference.

The Experiment of Ultimate Capacity for the Reinforced Concrete Beam Strengthened with CFRP

2011 ◽  
Vol 320 ◽  
pp. 450-455
Author(s):  
Jian He ◽  
Tong Wang ◽  
Huan Wang
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Structure ◽  
Concrete Beam ◽  
Low Cost ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Structure ◽  
Existing Structures ◽  
Shear Bearing Capacity ◽  
Structure Engineering

As to reinforced concrete structure, the method to deal with the shortage of bearing capacity is one of the puzzles of structure engineering, so its reinforcement technology is a research hotspot. At present, although there are many reinforcing methods of existing structures, FRP is the more widely used in engineering because of its efficiency, low cost, and beauty. The paper takes the strengthened reinforced concrete structure beam with FRP for example, bearing capacity of normal section, the shear bearing capacity and cohesiveness is tested, and bearing performance for strengthening the strengthened reinforced concrete beam with FRP is analyzed.

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