Experimental study on strength and ductility of carbonated concrete elements

2002 ◽  
Vol 16 (3) ◽  
pp. 187-192 ◽  
Author(s):  
Jianzhuang Xiao ◽  
Jie Li ◽  
Bolong Zhu ◽  
Ziyan Fan
2013 ◽  
Vol 12 (1) ◽  
pp. 243-250
Author(s):  
Błażej Meronk ◽  
Krzysztof Wilde

The paper presents the experimental study on the inter-modulation method for the diagnostics of concrete elements. The tests were conducted on a concrete plate subjected to ultrasonic waves and low frequency vibrations. The nonlinear acoustic effects, recorded in the experiments, made it possible to detect the presence of damaged zones. Further studies are necessary to establish the relation between the sidebanes of frequency spectra and the size of the damaged zone.


2000 ◽  
Vol 6 ◽  
pp. 855-866 ◽  
Author(s):  
T. Morita ◽  
A. Nishida ◽  
N. Yarnazaki ◽  
U. Schneider ◽  
U. Diederichs

2020 ◽  
Vol 5 (12) ◽  
pp. 108
Author(s):  
Antonino Recupero ◽  
Nino Spinella

In this paper, experimental and numerical results of a research project about the structural behavior of strengthened masonry are presented and discussed. The aim of the research is to study the in-plane shear behavior of an old masonry wall with an opening in the arch form, reinforced with a pioneering system of 3D pre-tensioned stainless steel ties. The masonry wall was in-plane loaded until first cracking appeared, then it was reinforced and re-loaded until failure. The experimental results have highlighted the benefits of the reinforcing method adopted, especially to provide an increasing in terms of both strength and ductility. Numerical modeling of the masonry wall behavior was accomplished by using non-linear finite-element methods generally adopted for reinforced concrete elements.


Author(s):  
S. Merkulov ◽  
E. Akimov

The inability of using this type of reinforcement as a cross on the support sections of the bent elements is one of the reasons limiting the wide use of composite rod reinforcement. To ensure the strength of bent elements along inclined sections, it is proposed to bend the rods of the working longitudinal working reinforcement, and geometric parameters of bends for some types of composite reinforcement are proposed, depending on the diameter of the rod. To develop a method for calculating the strength of inclined sections, it is necessary to develop experimentally justified prerequisites that take into account the features of joint operation of composite rod reinforcement in inclined sections. The article offers a method for experimental study of the strength and crack resistance of reinforced concrete bending elements with non-metallic composite rod reinforcement, including the design of prototypes, the installation scheme of devices during testing. The developed method allows to determine the parameters of strength and crack resistance of inclined sections of bent elements. The tasks of experimental studies of concrete elements reinforced with composite rod reinforcement are to determine the regularity of changes in the stress-strain condition of concrete and composite reinforcement during loading, to determine the nature of the destruction of elements along the inclined section, to obtain data on the strength and crack resistance of elements.


◽  
2016 ◽  
Author(s):  
Kohsuke Ishizeki ◽  
◽  
Tetsushi Kanda ◽  
Kazuhisa Yoda ◽  
Masarou Kojima ◽  
...  

2014 ◽  
Vol 13 (2) ◽  
pp. 283-290
Author(s):  
Błażej Meronk ◽  
Krzysztof Wilde

The paper presents the experimental study on the diagnostics of concrete elements with the use of nonlinear acoustic effects. The tests were conducted on a concrete plate subjected to ultrasonic waves modulated with and without an additional low frequency actuator. The experimental results showed that the new method based on the direct modulation of diagnostic ultrasonic waves also provided sub-harmonic frequencies that indicated the presence of damage. The new method does not require a low frequency actuator for generation of low frequency oscillations, and therefore, is more suitable for practical application.


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