Determination of Some Physical-Mechanical Properties of Volcanic Tuff Using Non-Destructive Method

2022 ◽  
Vol 11 (1) ◽  
pp. 1-9
Author(s):  
Ömer Can
Keyword(s):  
Mechanical Properties ◽  
Volcanic Tuff ◽  
Non Destructive

Variation of Concrete Strength with the Insertion of Carbon Nanotubes

2013 ◽  
Vol 818 ◽  
pp. 124-131
Author(s):  
Assed N. Haddad ◽  
Jorge F. de Morais ◽  
Ana Catarina J. Evangelista
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Construction Industry ◽  
Concrete Strength ◽  
Cement Composites ◽  
Deformation Properties ◽  
The Face ◽  
Non Destructive ◽  
Technological Community

Nanomaterials could change the face of modern construction because they are more resistant, more durable and have notable features. Concrete is a material widely used in construction industry worldwide. Carbon nanotube has been considered a new and outstanding material in nanoscience field with great potential application in the construction industry. The study presented in this paper, aims at assessing how carbon nanotubes can affect cement composites and so the concrete, in terms of microstructure and physical-mechanical properties. Three different ratios of carbon nanotubes have been searched: 0.20%, 0.40% and 0.60%. To evaluate the mechanical properties of the samples, destructive and non-destructive tests were carried out to obtain compressive strength, tensile strength by diametrical compression, dynamic modulus of elasticity as well as the determination of their deformation properties. This work also aims to motivate entrepreneurs and professionals in the sector of civil engineering on the advantages of the application of nanotechnology in construction, as well as providing information to the scientific and technological community in general.

Determination of Mechanical Properties of Magnesium Alloys and Composites by Small Punch Testing

2016 ◽  
Vol 821 ◽  
pp. 435-441 ◽  
Author(s):  
Denisa Bártková ◽  
Jiří Langer ◽  
Petr Dymáček ◽  
Libor Válka
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloys ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Empirical Formulas ◽  
Small Punch ◽  
Properties Of Materials ◽  
Non Destructive ◽  
Deflection Rate

Tests on miniature samples are increasingly used for the determination of mechanical properties of materials available in small volumes (non-destructive or semi-destructive approach). Small punch testing at constant deflection rate (SPT-CDR) of selected magnesium alloys and composites was performed at room temperature. Mechanical properties (yield strength, ultimate strength) were evaluated from SPT and correlated with results of uniaxial tensile tests (UTT). SPT characteristics were converted to uniaxial tensile properties by empirical formulas available in the literature. New formulas more appropriate for magnesium alloys were suggested.

scholarly journals DETERMINATION OF CONCRETE PROPERTIES DURING THE ASSESSMENT OF THE CONDITION OF FLAT REINFORCED CONCRETE STRUCTURES

2021 ◽  
pp. 80-87
Author(s):  
V. KOLOKHOV ◽  
V. VOLKOVA ◽  
L. MOROZ ◽  
S. BOGDAN
Keyword(s):  
Mechanical Properties ◽  
Concrete Structure ◽  
Concrete Strength ◽  
Physical And Mechanical Properties ◽  
Concrete Surface ◽  
Core Samples ◽  
Reliable Assessment ◽  
Normalized Parameters ◽  
Non Destructive

 Formulation of the problem. Operation of buildings and structures is based on periodic assessment of the condition of structures. The procedure for determining the strength of concrete by non-destructive methods requires a certain preparation of the concrete surface of the structure and sampling in order to calibrate the devices. During sampling, the samples may be damaged, in addition the surface of the cylinders does not meet the requirements for normalized test conditions. Part of the cores during selection is being destroyed, which reduces the representativeness of the results of determining the physical and mechanical properties of concrete. The purpose of the article is to find out the possibilities to increase the reliability of determining the physical and mechanical properties of concrete. Results. In the conditions of a real object, core samples were taken to study the concrete strength of the damaged area. Samples that did not meet the normalized parameters were prepared for testing using a repair mixture Mapegrout Thixotropic. Testing of the recovered core samples showed that the repair mixture adhered well to the surface of the core. The nature of the destruction in the restored and normalized samples is similar. Conclusions. Studies have shown that: the application of the existing method of determining the strength of concrete for slab structures limits the possibility of using core samples taken from structures; the use of Mapegrout Thixotropic repair mixture allows to carry out tests according to the normative method of damaged concrete samples or samples rejected due to size mismatch; reliable assessment of the deformable properties of concrete cores in many cases is impossible; the existing methodology needs to be improved or replaced by an alternative one; quantitative assessment of the rheological properties of the concrete mixture used for the manufacture of concrete structure is possible on the basis of comparing the deformable and strength characteristics of concrete structure, which requires formalization of the procedure and standardization.

Investigation of a Non-Destructive Method to Characterize Material Mechanical Properties of Pipelines in Service

2008 ◽  
Author(s):  
Avigae¨le Le Bastard ◽  
Re´mi Batisse ◽  
Vincent Gaschignard
Keyword(s):  
Mechanical Properties ◽  
Field Testing ◽  
Materials Properties ◽  
Defect Assessment ◽  
Micro Cracks ◽  
Standard Specimens ◽  
Integrity Management ◽  
Non Destructive ◽  
Non Destructive Characterization

In the frame of Pipelines Integrity Management, a better knowledge of actual materials properties of pipelines in service can save money by avoiding the cut and interruption of gas transit thanks to a more realistic defect assessment at failure. Different ways have to be explored to improve this knowledge on materials. One is based on the development of adapted correlations, well validated, to get from the poor material data available, the material properties which are required to analyse the defect behaviour. Another one is to use directly on field a non-destructive mechanical characterization tool. This paper focuses on non-destructive characterization by indenter method. This method is a succession of micro-indentations made by a spherical tungstene carbide indenter. From the ball displacement and stress applied during the load phase, tensile mechanical properties and toughness of the material are estimated. As the depth of the indenter displacement in steel is about 300 μm with no creation of micro-cracks, the test is considered as non-destructive. Hence, measurement can be made on operating pipelines without cut or interruption of gas transit. Gaz de France’s R&D Division has led laboratory and field-testing to evaluate the accuracy of the indenter tool and the ease and reliability to use it in-ditch conditions. Results on determination of actual tensile properties and toughness by indentation are presented, compared with results from destructive tests on standard specimens. Residual stresses and anisotropic effect on the indenter results are slightly investigated. Finally, all results are discussed to estimate the relevancy of this method for the Pipeline Integrity Management and some perspectives are given.

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