scholarly journals Numerical Modeling of Nonuniform Corrosion-Induced Concrete Crack Width

2018 ◽  
Vol 144 (8) ◽  
pp. 04018120 ◽  
Author(s):  
Shangtong Yang ◽  
Xun Xi ◽  
Kefei Li ◽  
Chun-Qing Li
Keyword(s):  
Numerical Modeling ◽  
Crack Width ◽  
Concrete Crack

scholarly journals C01 MONITORING OF CONCRETE CRACK WIDTH WITH OPTIC FIBER SENSORS

2009 ◽  
Vol 2009.11 (0) ◽  
pp. 114-118
Author(s):  
Kentaro IWASHITA ◽  
Zhishen WU ◽  
Akihiro HASHIMOTO ◽  
Zhang HAO
Keyword(s):  
Crack Width ◽  
Optic Fiber ◽  
Fiber Sensors ◽  
Concrete Crack

scholarly journals Concrete Crack Width Detecting System for Android Platform

2015 ◽  
Vol 9 (1) ◽  
pp. 846-851
Author(s):  
Chen Shuang-rui ◽  
Shi Zheng ◽  
Yan Quan-sheng
Keyword(s):  
Mobile Phone ◽  
Crack Width ◽  
Concrete Beam ◽  
Measuring System ◽  
Concrete Crack ◽  
Maximum Crack ◽  
Crack Detector ◽  
Processing Techniques ◽  
Edge Recognition ◽  
Test Result

In order to measure crack width accurately and automatically, an Android-based Automatic Crack Width Measuring System (ACWMS) has been developed, taking advantage of the high portability of Android devices. After capturing the image using mobile phone camera, the image is processed by image processing techniques, including graying, binaryzation, denoising and edge recognition. A specified algorithm is executed to calculate the crack width according to the provided edge data. Measurements has been done to each of the 10 cracks in the same concrete beam, using Samsung Galaxy S3 mobile phone and WYSX-40X Crack detector, respectively. Test result shows that the maximum crack width accuracy reaches 95.26%, which satisfies the construction needs. Therefore, this system can greatly improve the efficiency and accuracy during crack width measurement.

Experimental Research and Numerical Analysis on the Law of Deteriorated Performance for R.C. Frame Structure with Seismic Damages under Elevated Temperature (part I)

2011 ◽  
Vol 71-78 ◽  
pp. 1656-1663
Author(s):  
Ji Jun Miao ◽  
Long Fan ◽  
Yan Chun Liu ◽  
Bo Qi
Keyword(s):  
Elevated Temperature ◽  
Crack Width ◽  
Damage Index ◽  
Frame Structure ◽  
Axial Deformation ◽  
Concrete Frame ◽  
Concrete Crack ◽  
Temperature Experiment ◽  
The Law ◽  
Resistance Performance

Three R.C. frame structure models were designed with named KJ1, KJ2 and KJ3. Elevated temperature experiments were carried out to KJ1 and KJ2 with concrete crack width 0.2mm and 0.4mm respectively which was taken as the damage index ω caused by earthquake, KJ3 was directly undertaken to elevated temperature experiment. The laws of concrete crack development, axial deformation of frame column and standard heating curves were studied. The law between concrete crack ω and deteriorated performance for concrete frame structure was put forward, which can be a good reference for research on fire resistance performance of R.C. frame structure after earthquake.

Experimental Research on the Self-Healing Performance of Micro-Cracks in Concrete Bridge

2011 ◽  
Vol 250-253 ◽  
pp. 28-32 ◽  
Author(s):  
Ling Sun ◽  
Wen Yong Yu ◽  
Qi Ge
Keyword(s):  
Crack Width ◽  
Crack Surface ◽  
The Self ◽  
Strength Analysis ◽  
Self Healing ◽  
Healing Effect ◽  
Concrete Crack ◽  
Micro Cracks ◽  
Before And After ◽  
Capillary Tension

Hollow glass fiber with full of repair agent is embedded in concrete to repair components, and one - third point loading experiment is carried out to test the mechanical properties of it. Based on the strength analysis of specimens before and after self – healing, the self – healing effect of concrete is evaluated. By simulating the closed heal agent flowing and penetrating into the concrete crack surface under the capillary tension, the influence of crack width to the healing effect is analyzed.

scholarly journals Performance of piezoceramic sensors

2021 ◽  
Author(s):  
Rummaan Syed Ahmed
Keyword(s):  
Reinforced Concrete ◽  
Crack Width ◽  
Large Scale ◽  
Failure Modes ◽  
Concrete Strength ◽  
Small Scale ◽  
Active Monitoring ◽  
Concrete Members ◽  
Concrete Crack ◽  
Base Width

This study is in continuation of the previous research conducted at Ryerson University to develop a model for active monitoring of reinforced concrete members using piezo-ceramic sensor. In the previous research large concrete beam were investigated. The following study examines the performance of piezo-ceramic sensor to monitor maturity of concrete and to evaluate crack width of large base width concrete plates. Small scale beams and large scale slabs specimens were tested under three and four points bending respectively to evaluate the effectiveness of piezo-sensors at different failure modes. Test results from small scale beams were used to model correlation between concrete crack width/strains and sensor signals. The test result indicated that piezo-sensor can be used for active concrete strength monitoring at later stages. It can also be used as an effective indicator of crack width for reinforced concrete members with small base width.

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