Non-Destructive and Destructive Monitoring Methods of Fibre Concrete Homogeneity

2017 ◽  
Vol 259 ◽  
pp. 9-14 ◽  
Author(s):  
René Čechmánek ◽  
Martina Drdlová ◽  
Martin Bohac
Keyword(s):  
Cement Matrix ◽  
Fibre Reinforcement ◽  
Cement Composites ◽  
Monitoring Methods ◽  
Destructive Testing ◽  
Thin Sections ◽  
Wide Range ◽  
Fibre Cement ◽  
Non Destructive ◽  
Destructive Methods

Design, preparation and testing of fibre-cement composites are a task of wide range of research workplaces and universities in our country and abroad. However, a question on homogeneity of all cement matrix components and mainly optimal dispersion of fibre reinforcement in a mixture has not been yet solved sufficiently. Within testing of properties of such designed composites there is usually a realized fact, that variability of these properties is distinctive mainly for the reason of uneven dispersion of commonly used fibres in a whole matrix volume. Elimination of this phenomenon could be achieved by means of a design of the optimal homogenization process of dry mixture components with fibre reinforcement. The aim of research works was to find suitable homogenization techniques, design of mixing process and optimal dosing of individual components. By means of these actions it is possible to achieve the best dispersion of selected fibre types, both metal and non-metal, in fine-grained cementitious matrixes, which is subsequently verified in hardened composites at first by non-destructive and then by destructive methods. Four different fibre-cement mixtures were chosen as representatives for commonly used reinforcement in fibre-cement composites and test specimens with a thickness of 40 mm were prepared using processes suitable for the specific fibre reinforcement. At the first stage non-destructive testing by means of ultrasound waves was carried out at first on a compact test slab with dimensions 500 x 500 x 40 mm and subsequently on individual test specimens with dimensions 250 x 40 x 40 mm, cut from the test slab according to a designed pattern. At the second stage destructive testing of test specimens was performed, mainly evaluation of flexural strength with 4-point bending and subsequently preparation of thin sections from the failure area for observation by means of polarizing microscopy. A purpose of all these research works is finding of correlation between testing by means of destructive and non-destructive methods.

Monitoring of constructed and operated buildings

2019 ◽  
Author(s):  
Сергей Леонович ◽  
Sergey Leonovich ◽  
Дмитрий Снежков ◽  
Dmitriy Snezhkov ◽  
Валентин Доркин ◽  
...  
Keyword(s):  
Field Tests ◽  
The European Union ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Ultrasonic Methods ◽  
Wide Range ◽  
Long Term Observation ◽  
Supporting Frame ◽  
Non Destructive ◽  
Destructive Methods

The monograph considers a wide range of issues related to the determination of strength characteristics of concrete by non-destructive methods. The physical principles of the main methods of non-destructive testing of concrete in structures are stated, promising directions of improvement of non-destructive methods are considered. Much attention is paid to the development of ultrasonic methods of concrete testing. The extensive experimental material of laboratory tests and the results of field tests at construction sites, which are considered from the standpoint of the current standards and the introduced norms of the European Union, are presented. The results of long-term observation of deformations of the supporting frame of a high-rise building obtained using an automated monitoring system are presented. It is intended for engineering and technical workers of construction laboratories, designers, specialists engaged in the design and use of non-destructive testing of concrete, and will also be useful to students, undergraduates, graduate students and teachers of higher educational institutions dealing with quality control in construction.

scholarly journals A framework for corrosion assessment in metallic structures, from data analysis to risk based inspection

2021 ◽  
Vol 23 (1) ◽  
pp. 11-20
Author(s):  
Xiaofei Cui ◽  
Xiaoxia Liang ◽  
Ujjwal Bharadwaj
Keyword(s):  
Corrosion Damage ◽  
Quantitative Information ◽  
Assessment Process ◽  
Steel Bridge ◽  
Destructive Testing ◽  
Metallic Structures ◽  
Wide Range ◽  
Corrosion Assessment ◽  
Metallic Corrosion ◽  
Non Destructive

Metallic corrosion is a big challenge affecting many sectors in a nation’s economy. Necessary corrosion prevention actions have to be taken in order to maintain the integrity of engineering assets susceptible to corrosion. This paper proposes a holistic framework to support the management of corrosion in metallic structures. It is a fully automation corrosion assessment process, with risk updated by Bayesian theory. Through analyzing the thickness data measured by non-destructive testing (NDT) techniques, the influence of corrosion on the component can be estimated using statistical methods, which will enable users to make decisions on maintenance based on quantitative information. A case study using corrosion data from a steel bridge is included to demonstrate the proposed framework. It improved the conventional corrosion analysis method by the proposed statistical approach using representative thickness data, which aims to take full use of the remaining life. This model can be adapted to a wide range of metallic structure suffering from corrosion damage.

Quantitative Measurement System of Liquid Products in Sealed Tank

2019 ◽  
Vol 970 ◽  
pp. 63-74
Author(s):  
Yuliya Shulgina ◽  
Maria A. Kostina ◽  
P.V. Sorokin ◽  
Marina Polonskaya ◽  
O.A. Kozhemyak ◽  
...  
Keyword(s):  
Quantitative Measurement ◽  
Optimal Solution ◽  
Storage Conditions ◽  
Ultrasonic Pulse ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Wide Range ◽  
Liquid Products ◽  
Manometric Method ◽  
Non Destructive

Many industries apply pressure tanks for the storage of various types of liquids [1]. It can be toxic, chemically active liquids or food products. Storage conditions of these liquids can have a wide range of pressures and temperatures; therefore it is preferable to control the liquids levels from the outside of the tank. The most optimal solution in this case is the ultrasonic pulse time method [2-6], which is also widely used in robotics [7], fishing, shipping [8-9], archeology [10-11], non-destructive testing [12-17] and manometric method [18].

Advances in the Computed Tomography of Turbine Blades

2005 ◽  
Author(s):  
Martin Allen ◽  
Andrew T. Ramsey
Keyword(s):  
Computed Tomography ◽  
Data Extraction ◽  
Turbine Blades ◽  
Practical Method ◽  
International Standards ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Wide Range ◽  
Non Destructive ◽  
Testing And Evaluation

Recent advances in virtually all areas of industrial Computed Tomography (CT) now allow faster, higher resolution, and increasingly economic CT inspection of turbine blades than ever before. CT is now used for a wide range of Non Destructive Testing and Evaluation (NDT&E) applications including first article inspection, defect detection, internal measurement, wear (and failure) analysis, and reverse engineering. Improvements range from the introduction of international standards on CT, through improvements in acquisition, reconstruction, and data extraction. Some of the most significant advances have been made in the ability to process the data generated by the CT systems. Today, CT is an increasingly practical method for the Non Destructive Testing and Evaluation of turbine blades.

Processing Changes of Cement Based Composites Reinforced with Silane and Isocyanate Eucalyptus Modified Fibres

2012 ◽  
Vol 517 ◽  
pp. 437-449
Author(s):  
Gustavo Henrique Denzin Tonoli ◽  
M.N. Belgacem ◽  
G. Siqueira ◽  
J. Bras ◽  
Lourival M. Mendes ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Water Retention ◽  
Cement Matrix ◽  
Cement Composites ◽  
Cellulose Fibres ◽  
Dimensional Changes ◽  
Cellulose Pulp ◽  
Pulp Fibres ◽  
Fibre Cement ◽  
Dimensional Instability

Fibre-cement products had been widely used in the world due to their versatility as corrugated and flat roofing materials, cladding panels and water containers presented in large number of building and agriculture applications. The main reason for incorporating fibres into the cement matrix is to improve the toughness, tensile strength, and the cracking deformation characteristics of the resultant composite. One of the drawbacks associated with cellulose fibres in cement application is their dimensional instability in the presence of changing relative humidity. The objective of the present work is to evaluate the effect of surface treatment of eucalyptus cellulose pulp fibres on the processing and dimensional changes of fibre-cement composites. Surface modification of the cellulose pulps was performed with methacryloxypropyltri-methoxysilane (MPTS), aminopropyltri-ethoxysilane (APTS) and n-octadecyl isocyanate, an aliphatic isocyanate (AI), in an attempt to improve their dimensional instability into fibre-cement composites. X-ray photoelectron spectroscopy (XPS) showed the chemical changes occurred at the surface, and contact angle measurements showed the changes in the surface energy. MPTS-and AI-treated fibres presented lower hydrophilic character than untreated fibres, which led to lower water retention values (WRV). APTS increased the water retention value of the pulp and improved the capacity of hydrogen bonding of the fibres. MPTS-and AI-treated fibres led to low final water/cement ratios and reduced volume changes after pressing. MPTS-treated fibres decreased the water and dimensional instability of the fibre-cement composites, while the contrary occurred with APTS-modified and AI-modified fibres.These results are promising and contribute for new strategy to improve processing and stability of natural fibres-reinforced cement products.

scholarly journals Reconfigurable Information-Measuring System of Thermophysical Properties of Solid Materials with an Intelligent Sensor

2019 ◽  
pp. 4-19
Author(s):  
Z.M. Selivanova ◽  
V.S. Eryshova
Keyword(s):  
Thermophysical Properties ◽  
Measuring System ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Solid Materials ◽  
Intelligent Sensor ◽  
Information Measuring ◽  
Wide Range ◽  
Information Measuring System ◽  
Non Destructive

An information-measuring system for non-destructive testing of thermophysical properties of solid materials with an intelligent sensor has been developed. Mathematical models for reconfiguring the structure of the information-measuring system and the intelligent sensor were built. Algorithms for changing the configuration of the intelligent sensor and the functioning of the information-measuring system have been developed, allowing us to expand the systems functionality for studying thermophysical properties of solid materials in a wide range of thermal conductivities, as well as to improve the accuracy and efficiency of thermophysical measurements by adapting the system to the class of materials studied.

scholarly journals Algorithms for searching defects in engineering structures using GPR (Review article, Part I)

2019 ◽  
Keyword(s):  
Remote Sensing ◽  
Polarization State ◽  
Layered Media ◽  
Ultra Wideband ◽  
Primary Data ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Engineering Structures ◽  
Wide Range ◽  
Non Destructive

Relevance of the problem of the development of technical means (GPR) and algorithms for processing ultra-wideband signals follows from the wide range of possibilities that these means of non-destructive testing and remote sensing provides, together with the potential of modern computing tools and software. Of particular interest in this regard are the results obtained by using various effects associated with a change in the polarization state of both primary (probing) pulses and signals reflected from complex multilayer media to detect defects in them. This is due to the possibility of not only quickly detecting heterogeneities, but also with the relatively low cost of such work. The purpose of the work is a review of various technical means (pulsed georadars) and signal processing methods for detecting various internal inhomogeneities in plane-layered media. These heterogeneities include, in addition to various internal communications elements (cables) and technical elements (drainage pipes), also dangerous externally invisible defects - subsurface cracks and delamination (interruption of contact between the layers). Materials and methods. The paper provides an overview of methods developed by the author, among others, which are designed to solve primarily the practical problems of detecting subsurface inhomogeneities and defects in plane-layered media. The physical basis for the creation of these methods was the result of many years of research by the author related to the analysis of the polarization state of complex (including pulsed) signals scattered by various objects. Results. The basis of the considered results is made up of both scientific articles and patents of Ukraine for inventions and utility models obtained by the author. Conclusions. The review of the results and various methods presented in the article is another confirmation of the wide possibilities offered by new means of remote sensing and non-destructive testing. These tools include not only the devices themselves (elements for obtaining primary data), but also information processing algorithms and software, combined into a single methodology for collecting, processing and subsequent storage of data on the current state of the examined technical and natural objects.

NUMERICAL SIMULATION OF LEAKAGE FLOW FIELD OF RAILWAY FREIGHT BRAKING PIPELINE

2021 ◽  
Vol 5 (11) ◽  
Author(s):  
Q Huang ◽  
Y. M. Mo ◽  
Z Y. Li ◽  
J. R. Song ◽  
S. F. Liao ◽  
...  
Keyword(s):  
Industrial Production ◽  
Ultrasonic Frequency ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Detection Distance ◽  
Wide Range ◽  
Testing Technology ◽  
Theory Research ◽  
Human Eyes ◽  
Non Destructive

pipeline leakage causes great harm in industrial production, and the detection of pipeline leakage has important application value in industrial production. Ultrasonic testing technology has a wide range of applications in the field of industry, is one of the main means of non-destructive testing. It is very difficult to distinguish between human eyes and ears. Therefore, by using the propagation characteristics and unidirectionality of ultrasonic, non-destructive testing can be realized, and the detection distance is wide, and the safety of personnel can be guaranteed. In this paper, ANSYS software is used to simulate different cases of pipeline leakage, mainly including the relationship between leakage velocity and ultrasonic frequency with different leakage aperture, different pressure in the pipe, different spacing between two holes. The simulation is of great significance for the field theory research of pipeline leakage and the detection of pipeline leakage.

Ультразвуковой контроль дефектов металлических изделий сложной формы

2021 ◽  
pp. 31-36
Author(s):  
В.В. Ларионов ◽  
А.М. Лидер ◽  
Д.О. Долматов ◽  
Д.А. Седнев
Keyword(s):  
Test Object ◽  
Degrees Of Freedom ◽  
Surface Profile ◽  
Ultrasonic Waves ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Six Degrees Of Freedom ◽  
Wide Range ◽  
Manufactured Products ◽  
Non Destructive

Nowadays, automation is an actual issue in the development of methods and equipment for ultrasonic non-destructive testing. The conditions of modern industrial production require the development and application the automated testing equipment which is versatile to a wide range of manufactured products, which can have a complex shape. In this paper, we propose a technique for ultrasonic testing of complex-shaped objects. Such technique implies the application of six degrees of freedom robotic manipulators to ensure the required refraction angle of ultrasonic waves into the test object at each measuring position. The trajectory of the robot movement during scanning is provided by restoring the surface profile of the test object using optical profilometry and determining the location of the test object relative to the robotic manipulator using a probe tip. Within the framework of this work, the effectiveness of the developed technology is verified experimentally.

scholarly journals Nonconventional concrete hollow blocks evaluation by destructive and non-destructive testing

2013 ◽  
Vol 6 (3) ◽  
pp. 392-398
Author(s):  
M.S. Rodrigues ◽  
G.C.S. Ferreira ◽  
L. Shiroma ◽  
A.L. Beraldo
Keyword(s):  
Portland Cement ◽  
Silica Fume ◽  
Statistical Difference ◽  
Rice Husk Ash ◽  
Partial Replacement ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
And Control ◽  
Non Destructive ◽  
Destructive Methods

The aim of this study was to evaluate cementitious matrices properties by partial replacement of Portland cement by silica fume (SF) or by rice husk ash (RHA), and their application in nonbearing hollow blocks, tested by destructive and non-destructive methods. The following mixtures were produced: reference (100% of Portland cement) and Portland cement replacement (10% by mass) with SF or RHA. The non-destructive testing showed that the highest values of UPV were obtained for SF-based blocks and RHA-based blocks. The destructive test showed better results for SF-based blocks, but there was no statistical difference between the RHA-based and control ones.

Sign in / Sign up

Export Citation Format

Share Document