Non-destructive testing to evaluatein situ maturity on prestressed reinforced concrete members

1985 ◽  
Vol 18 (3) ◽  
pp. 171-180 ◽  
Author(s):  
F. Meneghetti ◽  
T. Meneghetti
Keyword(s):  
Reinforced Concrete ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Concrete Members ◽  
Non Destructive

scholarly journals Non-destructive Testing of a 100-Year-Old Reinforced Concrete Flat Slab Bridge

2020 ◽  
Vol 6 ◽  
Author(s):  
Patryk J. Wolert ◽  
Marek K. Kolodziejczyk ◽  
J. Michael Stallings ◽  
Andrzej S. Nowak
Keyword(s):  
Reinforced Concrete ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Flat Slab ◽  
Non Destructive

Techniques of Non-Destructive Testing of Steel Fiber Reinforced Concrete

2017 ◽  
Vol 755 ◽  
pp. 153-158 ◽  
Author(s):  
Eva Zezulová ◽  
Tereza Komárková
Keyword(s):  
Reinforced Concrete ◽  
Large Scale ◽  
Steel Fiber ◽  
Fiber Reinforced Concrete ◽  
Non Destructive Testing ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
Destructive Testing ◽  
Measurement Devices ◽  
Non Destructive

Non-destructive testing (NDT) is seeing increasingly frequent use in civil engineering thanks to the fact that the tests are repeatable and do not cause serious damage to the material. The requirements for the development and modernization of available testing devices and methodologies are ever increasing and the testing of existing structures often requires the use of NDT. Unfortunately, every measurement and methodology has its limits and the measurement devices for the evaluation of steel fiber reinforced concrete (SFRC) are no exception. In recent decades there has been an effort to modernize and develop existing measurement devices for SFRC testing. This building material is commonly used especially in large-scale structures. Nevertheless, the technology of SFRC could seem complicated when compared with ordinary concrete and the very nature of this composite material could lead to SFRC inhomogeneity during construction. This paper describes the assessment of SFRC by more or less available methodologies and measurements utilizing non-destructive principles.

scholarly journals Ultrasonic pitch and catch technique for non-destructive testing of reinforced concrete slabs

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Wael A. Zatar ◽  
Hai D. Nguyen ◽  
Hien M. Nghiem
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Point Contact ◽  
Test Method ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Reinforced Concrete Slab ◽  
Reinforced Concrete Slabs ◽  
Rc Slab ◽  
Non Destructive

Abstract This study aims at evaluating reinforced concrete (RC) bridge elements using ultrasonic pitch and catch (UPC) non-destructive testing (NDT) technique. A validation reinforced concrete slab with two embedded layers of rebars and artificial defects (voids, honeycombs, and debondings) was designed and tested. A commercial UPC NDT device (hereafter called “UPC device”), which is based on the ultrasonic shear-wave test method using dry-point-contact transmitting and receiving transducers in a “pitch-catch” configuration, was used to map internal defects of the validation RC slab. The recorded data from the UPC device was analyzed using a modified synthetic aperture focusing technique (SAFT). A software was developed to reconstruct 2-D images of the RC slab cross-sections using novel signal filtering and processing techniques. The results revealed that the 2-D image reconstructed from the developed software accurately exhibited locations and horizontal dimensions of the steel rebars, voids, and debondings. In addition, the developed software was capable to provide much higher resolution and sharper images of the anomalies inside the RC slab compared to the UPC device’s proprietary imaging software.

Estimation of Steel Rebar Position and Thickness in Concrete Members Using Impact Echo Method

2014 ◽  
Vol 605 ◽  
pp. 420-423
Author(s):  
Seong Uk Hong ◽  
Seung Hun Kim ◽  
Yong Taeg Lee
Keyword(s):  
Heterogeneous Material ◽  
Non Destructive Testing ◽  
Testing Methods ◽  
Destructive Testing ◽  
Impact Echo ◽  
Thickness Estimation ◽  
Steel Rebar ◽  
Concrete Members ◽  
Non Destructive ◽  
Impact Echo Method

Non-destructive testing methods, unlike typical destructive testing methods that deconstruct or cut the building in case of issues such as pores, heterogeneous material, cracks or any such equivalent issues inside/outside the building. And refer to the testing methods for pores, heterogeneous material, or defectiveness occurring in the specimen without changes or destruction of internal structure using ultrasound, radiation, electromagnetism, fluid, heat, or light. In this study, among such non-destructive testing methods, the impact echo method was used for an experiment to estimate the steel rebar location and thickness in the concrete mock member. The mix was made with design standard strength of 30MPa, and for the steel rebar, diameter 22mm was used on the specimen of 300×370×200 to install spacer on the ground surface, and after separating by 40mm, it was arranged with 130mm and 150mm from the top of the specimen to the top of the rebar in 1 column and 3 rows. The specimen for thickness estimation was manufactured with total length of 1800×300 and 6 varying thicknesses of 150mm, 180mm, 210mm, 240mm, 270mm, and 300mm. As the result of rebar location estimation, the maximum resonant frequency was found to be 11269Hz, 9453Hz,and the rebar location estimates were 127.8mm and 151.8mm, which was relatively accurate with error rate of 1.72% and 1.19% from the actual value. In case of thickness estimation specimen, the error rates comparing actually measured thickness and the average value were 2.2%, 2.2%, 4.6%, 0.9%, 3.8%, and 4.7%, which were relatively accurate with average of 3.1%. Through this study, the applicability of steel rebar location and thickness estimation in concrete members using impact echo method could be confirmed.

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