scholarly journals New non-destructive method for testing the strength of cement mortar material based on vibration frequency of steel bar: Theory and experiment

2020 ◽  
Vol 262 ◽  
pp. 120931
Author(s):  
Hao Shi ◽  
Lei Song ◽  
Wenlong Chen ◽  
Houquan Zhang ◽  
Guozhu Wang ◽  
...  
Keyword(s):  
Vibration Frequency ◽  
Cement Mortar ◽  
Steel Bar ◽  
Non Destructive ◽  
Theory And Experiment

scholarly journals Non-Destructive Assessment of Masonry Pillars using Ultrasonic Tomography

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2543 ◽  
Author(s):  
Monika Zielińska ◽  
Magdalena Rucka
Keyword(s):  
Computed Tomography ◽  
Velocity Distribution ◽  
Internal Structure ◽  
Cement Mortar ◽  
Tomographic Imaging ◽  
Stress Waves ◽  
Ultrasonic Tomography ◽  
Reinforcing Bar ◽  
Steel Bar ◽  
Non Destructive

In this paper, a condition assessment of masonry pillars is presented. Non-destructive tests were performed on an intact pillar as well as three pillars with internal inclusions in the form of a hole, a steel bar grouted by gypsum mortar, and a steel bar grouted by cement mortar. The inspection utilized ultrasonic stress waves and the reconstruction of the velocity distribution was performed by means of computed tomography. The results showed the possibilities of tomographic imaging in characterizing the internal structure of pillars. Particular attention was paid to the assessment of the adhesive connection between a steel reinforcing bar, embedded inside pillars, and the surrounding pillar body.

Effects of Ceramsite Concrete Strength on Natural Frequency Based on ANSYS

2012 ◽  
Vol 204-208 ◽  
pp. 4124-4127
Author(s):  
Hao Qing Wang ◽  
Qiu Kong ◽  
Zhou Ping Yu ◽  
Wei Jun Yang
Keyword(s):  
Natural Frequency ◽  
Seismic Design ◽  
Vibration Frequency ◽  
Concrete Strength ◽  
Reinforcing Steel ◽  
Material Parameters ◽  
Modeling Analysis ◽  
Steel Bar ◽  
Environmental Vibration

By separate modeling analysis based upon ANSYS, SOLID65 unit of the entity is selected to simulate ceramsite concrete, and reinforcing performance is selected to simulate the effect of reinforcing steel bar. The strength on natural frequency’s effects was studied through changing the ansys model’s material parameters of ceramsite concrete. The strength of ceramsite concrete can be determined and applied to the anti-seismic design according to the size of the environmental vibration frequency.

scholarly journals Non Destructive Behavior of Corroded Reinforced Geopolymer Concrete Beams

2019 ◽  
Vol 9 (2) ◽  
pp. 5411-5414
Keyword(s):  
Polymer Material ◽  
Concrete Beams ◽  
Experimental Tests ◽  
Steel Bar ◽  
Long Time ◽  
Reinforcement Bar ◽  
Object Of Study ◽  
Corrosion Of Steel ◽  
Non Destructive ◽  
Natural Corrosion

Corrosion of steel reinforcement bar embedded in geo-polymer material has been an object of study to confirm its technical viability. The available alkalinity of geo-polymer material initially was suspected to be harmful for alkali-silica reaction, but then it was found to be beneficial to maintain passivity of the steel bar in concrete. Many researchers carried out studies on the influence of corrosion on bond, generally developed on the basis of experimental tests in specimens subjected to artificial corrosion. The current density applied to accelerate the corrosion influences the bond strength. Since, natural corrosion develops in a very long time, an artificial corrosion has been provided

Research on Non-Destructive Testing for Defects of Steel Bar in Concrete

2013 ◽  
Vol 351-352 ◽  
pp. 143-147
Author(s):  
Jing Yang ◽  
Wei Heng Yuan ◽  
Jun Tan
Keyword(s):  
Defect Detection ◽  
Electromagnetic Induction ◽  
Experimental Result ◽  
Non Destructive Testing ◽  
Test Device ◽  
Destructive Testing ◽  
Structure Detection ◽  
Steel Bar ◽  
Non Destructive ◽  
Magnetic Scanner

Steel bar defect detection in concrete is an important content of civil engineering structure detection. Currently there are no effective methods for nondestructive testing of steel bar defects . This paper studies the application of electromagnetic induction technology for Steel bar defect detection. Firstly, the principle of electromagnetic induction technology to detect rebar are described. Secondly,an air dielectric test device was designed and Steel bar defect in the device was detected by magnetic scanner. Through analyzing we got the characteristics of scanning images from different Steel bar defects. Thirdly this experimental result was compared with detection result in concrete.Finally verify the accuracy and feasibility of this method.

scholarly journals Predicting the Mechanical Features of Cement Mortar Using Destructive and non-Destructive Tests

2019 ◽  
Vol 518 ◽  
pp. 022007
Author(s):  
Shamel Abdul Raheem ◽  
Majeed Abdul Saheb ◽  
Ruaa Adnan Alshreefi ◽  
Hayder Hussein Moula ◽  
Baydaa Hussain Maula ◽  
...  
Keyword(s):  
Cement Mortar ◽  
Non Destructive

Non-Destructive Test of the Steel Bar by Using Piezoceramics Sheets

2013 ◽  
Vol 718-720 ◽  
pp. 692-697 ◽  
Author(s):  
Zhu Peng Zheng ◽  
Ying Lei ◽  
Xue Peng Cui ◽  
Song Yu
Keyword(s):  
Guided Waves ◽  
Piezoelectric Ceramics ◽  
Ultrasonic Guided Waves ◽  
Destructive Test ◽  
Steel Bar ◽  
Non Destructive

Piezoelectric ceramics sheets are used to excite and receive ultrasonic guided waves in a steel bar. The multi-modes and disperse characteristics of guided waves within that are investigated theoretically and experimentally. The results show that ultrasonic guided waves can be generated and received by piezoelectric ceramics sheets which can be used to measure the length of the steel bar and detect the defection in it.

Electromagnetic Launching System as an Alternative to Non-Destructive Sonic Wave Generation for Steel Bar Length Determination

2021 ◽  
Vol 19 (02) ◽  
pp. 306-313
Author(s):  
Isabela Grossi da Silva ◽  
Marlio Jose do Couto Bonfim ◽  
Vitor Pereira Faro
Keyword(s):  
Wave Generation ◽  
Steel Bar ◽  
Sonic Wave ◽  
Length Determination ◽  
Non Destructive

scholarly journals Determining radium-226 concentration from radon-222 emanation in building materials: a theoretical model

2019 ◽  
Vol 7 (2A) ◽  
Author(s):  
Rafael Carvalho Barreto ◽  
Allan F. N. Perna ◽  
Danielle C. Narloch ◽  
Flavia Del Claro ◽  
Janine N. Correa ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Building Material ◽  
Nuclear Physics ◽  
Building Materials ◽  
Gamma Ray ◽  
Cement Mortar ◽  
One Dimension ◽  
Gamma Ray Spectrometry ◽  
Direct Measurements ◽  
Non Destructive

It was developed an improved theoretical model capable to estimate the radium concentration in building materials solely measuring the radon-222 concentration in a confined atmosphere.This non-destructive technique is not limited by the size of the samples, and it intrinsically includes back diffusion.The resulting equation provides the exact solution for the concentration of radon-222 as a function of time and distance in one dimension.The effective concentration of radium-226 is a fit parameter of this equation.In order to reduce its complexity, this equation was simplified considering two cases:low diffusion in the building material compared to the air, anda building material initially saturated with radon-222.These simplified versions of the exact one dimension solution were used to fit experimental data.Radon-222 concentration was continuously measured for twelve days with an AlphaGUARD detector, located at the Laboratory of Applied Nuclear Physics at Universidade Tecnologica Federal do Parana (UTFPR).This model was applied to two different materials: cement mortar and concrete, which results were respectively (15.7 +- 8.3) Bq/kg and (10.5 +- 2.4) Bq/kg for the radium-226 effective concentration.This estimation was confronted with the direct measurements of radium in the same materials (same sources) using gamma-ray spectrometry, fulfilled at Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), which results were respectively (13.81 +- 0.23) Bq/kg and (12.61 +- 0.22) Bq/kg.

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