In-situ pore size investigations of loaded porous concrete with non-destructive methods

2018 ◽  
Vol 111 ◽  
pp. 72-80 ◽  
Author(s):  
H. Rifai ◽  
A. Staude ◽  
D. Meinel ◽  
B. Illerhaus ◽  
G. Bruno
Keyword(s):  
Pore Size ◽  
Porous Concrete ◽  
Non Destructive ◽  
Destructive Methods

Laboratory and in-situ non-destructive methods to evaluate the thermal transmittance and behavior of walls, windows, and construction elements with innovative materials: A review

2019 ◽  
Vol 182 ◽  
pp. 88-110 ◽  
Author(s):  
Nelson Soares ◽  
Cláudio Martins ◽  
Margarida Gonçalves ◽  
Paulo Santos ◽  
Luís Simões da Silva ◽  
...  
Keyword(s):  
Thermal Transmittance ◽  
Innovative Materials ◽  
And Behavior ◽  
Non Destructive ◽  
Destructive Methods

scholarly journals Methodology for the in situ testing of the moisture content of brick walls: an example of application

2020 ◽  
Vol 20 (4) ◽  
Author(s):  
Anna Hoła
Keyword(s):  
Moisture Content ◽  
Fourteenth Century ◽  
In Situ Testing ◽  
Negative Effects ◽  
Non Destructive ◽  
Historical Periods ◽  
Destructive Methods ◽  
Author Knowledge

Abstract The article presents original methodology of testing the moisture content of brick walls in buildings. It was developed on the basis of own experience acquired during testing the moisture content in many excessively wet buildings erected in various historical periods. The tests were conducted using different methods, including non-destructive methods. To emphasize the importance of the problem, an overview of the methodology was preceded by a brief presentation of the causes and negative effects of excessive moisture and salinity in brick walls. In addition, the article is illustrated with an example of the effects of moisture content tests carried out according to the developed methodology on a facility from the fourteenth century. According to the author, knowledge of the presented methodology, and its application, should contribute to both the improvement of the quality of conducted research and the credibility of the obtained results.

Application of Acoustic Emission Method and Impact Echo Method to Structural Rehabilitation

2018 ◽  
Vol 776 ◽  
pp. 81-85 ◽  
Author(s):  
Luboš Pazdera ◽  
Richard Dvořák ◽  
Michaela Hoduláková ◽  
Libor Topolář ◽  
Karel Mikulášek ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Structural Integrity ◽  
Concrete Structures ◽  
Monitoring And Evaluation ◽  
In Situ Monitoring ◽  
Impact Echo ◽  
Non Destructive ◽  
Impact Echo Method ◽  
Destructive Methods

The paper is concerned with the technical aspects of the appraisal and retrofitting process of fire damaged reinforced concrete structures. The assessment of fire damaged structures is carried out along lines similar to those of the appraisal of existing structures. In practice, constructions are most often assessed by destructive tests in-situ and on core bore specimens. In addition to destructive tests, damaged structures are also assessed by non-destructive ones. The present paper shows the use of non-destructive methods of measurement using the acoustic-emission and impact-echo methods. Acoustic emission provides valuable data on the structural integrity of a material. This method has a significant potential to be used for in-situ monitoring and evaluation of the current state of structures. An impact-echo method is based on impact-generated stress waves that propagate through concrete and are reflected by internal flaws and external surfaces. Impact-echo can be used to determine the location and extent of flaws such as crack delamination, voids, honeycombing and deboning in plain, reinforced, and post-tensioned concrete structures. The paper presents a possible rehabilitation plan based on the potential results obtained by these non-destructive methods.

scholarly journals In-Situ Moisture Assessment in External Walls of Historic Building using Non-Destructive Methods

2019 ◽  
Vol 23 (1) ◽  
pp. 122-134
Author(s):  
Ritvars Freimanis ◽  
Rasa Vaiskunaite ◽  
Tereza Bezrucko ◽  
Andra Blumberga
Keyword(s):  
Relative Humidity ◽  
Weather Data ◽  
Mold Growth ◽  
Historic Building ◽  
Historic Masonry ◽  
Non Destructive ◽  
Destructive Methods ◽  
Rising Damp

Abstract In-situ measurements of a case study building located in Riga old town near the river Daugava has been carried out in this work. Performed measurements are moisture level of historic masonry, and interstitial monitoring of temperature and relative humidity between the layers of internal insulation and external wall. Obtained results are compared with outdoor weather data. Results show that during the cold months of the year no rising damp problem. No interstitial condensation under the internal insulation, and no risk of mold growth occur. However, the façade of the building tends to be highly influenced by the outdoor weather, and the moisture of the masonry increases during the rain load events.

A Method for Characterization of Geometric Deviations in Clinch Points with Computed Tomography and Transient Dynamic Analysis

2021 ◽  
Vol 883 ◽  
pp. 89-96
Author(s):  
Daniel Köhler ◽  
Behdad Sadeghian ◽  
Robert Kupfer ◽  
Juliane Troschitz ◽  
Maik Gude ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Dynamic Analysis ◽  
Ex Situ ◽  
High Temporal Resolution ◽  
Outer Diameter ◽  
Transient Dynamic Analysis ◽  
Transient Dynamic ◽  
Non Destructive ◽  
Destructive Methods

When joining lightweight parts of various materials, clinching is a cost efficient solution. In a production line, the quality of a clinch point is primarily controlled by measurement of dimensions, which are accessible from outside. However, methods such as visual testing and measuring the bottom thickness as well as the outer diameter are not able to deliver any information about the most significant geometrical characteristic of the clinch point, neck thickness and undercut. Furthermore, ex-situ destructive methods such as microsectioning cannot detect elastic deformations and cracks that close after unloading. In order to exceed the current limits, a new non-destructive in-situ testing method for the clinching process is necessary. This work proposes a concept to characterize clinch points in-situ by combining two complementary non-destructive methods, namely, computed tomography (CT) and ultrasonic testing. Firstly, clinch points with different geometrical characteristics are analysed experimentally using ex-situ CT to get a highly spatially resolved 3D-image of the object. In this context, highly X-ray attenuating materials enhancing the visibility of the sheet-sheet interface are investigated. Secondly, the test specimens are modelled using finite element method (FEM) and a transient dynamic analysis (TDA) is conducted to study the effect of the geometrical differences on the deformation energy and to qualify the TDA as a fast in-situ non-destructive method for characterizing clinch points at high temporal resolution.

scholarly journals Estimation and correlation of chlorophyll and nitrogen contents in Psidium guajava L. with destructive and non-destructive methods

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Luisa-Liliana Güiza-Castillo ◽  
Elberth-Hernando Pinzón-Sandoval ◽  
Pablo-Antonio Serrano-Reyes ◽  
German-Eduardo Cely-Reyes ◽  
Pablo-Cesar Serrano-Agudelo
Keyword(s):  
Nitrogen Concentration ◽  
Estimation Methods ◽  
Physiological Status ◽  
Total Chlorophyll ◽  
Phenological Stages ◽  
Linear Type ◽  
Foliar Nitrogen ◽  
Non Destructive ◽  
Destructive Methods

Estimating photosynthetic pigments, such as chlorophylls, as well as the foliar nitrogen content is very important for the evaluation of the nutritional and physiological status of a plant. However, producers cannot easily carry out these estimations because they involve analyses in laboratories that are costly and time-consuming. The SPAD-502 total chlorophyll index meter is efficient at rapidly estimating total chlorophyll contents in situ, along with its relationship with the total nitrogen concentration in tissues. The objective of this research was to validate a non-destructive in situ method (SPAD) for use in place of destructive estimation methods for chlorophylls a, b and total, as well as the foliar nitrogen concentration in guava plants (Pisium guajaba L.), cv. Regional Roja, in three phenological stages under the conditions of the municipality of Vélez-Santander (Colombia). The data obtained with the SPAD-502 and the content of chlorophylls a, b and total were adjusted to a second-degree polynomial with correlation coefficients (r) greater than 0.91 for the three phenological stages, while the concentration of foliar nitrogen was adjusted to a linear type model with determination coefficients (R2) higher than 0.90, indicating a highly linear correlation between the non-destructive method and the destructive methods used in the present study.

scholarly journals COMPARATIVE SURFACE DAMAGE DETERMINATION AT A JEWISH GRAVE USING TWO DIFFERENT MOBILE ULTRASONIC VELOCITY DEVICES

2017 ◽  
Vol 50 (3) ◽  
pp. 1626 ◽  
Author(s):  
B. Christaras ◽  
An. Moropoulou ◽  
M. Chatziangelou ◽  
L. Dimitraki ◽  
K. Devlioti
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Surface Damage ◽  
P Wave ◽  
University Campus ◽  
Ultrasonic Velocities ◽  
Wave Velocities ◽  
Non Destructive ◽  
Destructive Methods

The non-destructive methods are necessary in the investigation of the physical and mechanical properties of the materials in monuments. In this framework the ultrasonic velocities were used in situ for the elaboration and evaluation of the weathering on the surfaces of monuments. Additionally, the P-wave velocities were used for the estimation of the depth of weathered zone, as well as the depth of cracks at the surface of the monument. This estimation was performed on a Jewish tomb placed in the AUTH university campus between the building of Law and Economic Sciences and the Administration building, of the Aristotle University of Thessaloniki. 

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