scholarly journals Properties of Cracking Patterns of Multi-Walled Carbon Nanotube-Reinforced Cement Matrix

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2942 ◽  
Author(s):  
Maciej Szeląg
Keyword(s):  
Image Analysis ◽  
Cement Paste ◽  
Fractal Theory ◽  
Sodium Dodecyl ◽  
Crack Density ◽  
Surface Preparation ◽  
Cement Matrix ◽  
Multi Wall Carbon Nanotubes ◽  
Analysis Tools ◽  
Average Cluster

The research presented in this paper presents a quantitative analysis of cracking patterns on the surface of cement paste, which has been modified by the addition of the multi-wall carbon nanotubes (MWCNTs). The cracking patterns analyzed were created as a result of increased temperature load. MWCNTs were used as an aqueous dispersion in the presence of a surfactant, sodium dodecyl sulfate (SDS). Four series of the cement paste were tested, and the samples differed in the water/cement (w/c) ratio, cement class, and the presence of MWCNTs. Image analysis tools were used to quantify the cracking patterns and it was proposed to measure parameters, such as the average cluster area, average cluster perimeter, average crack width, and crack density. In order to facilitate the image analysis process, the sample surface was subjected to preparation and using statistical analysis tools it was assessed whether the method of surface preparation affects the way the sample is cracked. The paper also presents the analysis of the relationships that occur between parameters describing the cracking patterns, and also with the physico-mechanical properties of the cement pastes. It was attempted to explain the dependencies using elements of fractal theory and the theory of dispersion systems.

scholarly journals Analysis of the development of cluster cracks in the cement paste modified by microsilica

2015 ◽  
Vol 14 (4) ◽  
pp. 117-127 ◽  
Author(s):  
Maciej Szeląg ◽  
Stanisław Fic
Keyword(s):  
Image Analysis ◽  
Cement Paste ◽  
Digital Processing ◽  
Analysis Techniques ◽  
Cluster Area ◽  
Temperature Load ◽  
Computer Based ◽  
External Loads ◽  
Average Cluster ◽  
Image Analysis Techniques

Article describes the course of research on the possibility of the application of the computer-based image analysis techniques to evaluate the structure of cluster cracks on the surface of modified cement paste. Four sets of specimens were performed, based on two Portland cements (CEM I 42,5R and CEM I 52,5R). In addition, the two series include microsilica as a substitute for 10% of cement. Cracks of samples were obtained by the sudden temperature load at the value of 250°C. Image of the cracked surface was obtained by scanning at a resolution of 2400DPI, and to digital processing and measurements ImageJ v. 1.46r software was used. To describe the structure of the cracks two stereological parameters were proposed: average cluster area (A) and average cluster perimeter (L). The aim of the work is to reference obtained results from the image analysis to the compressive and tensile strength of tested specimens. In addition, considering the structure of cement paste as a dispersion system the process of the cluster structures formation was described, which under external loads transform and affect the final properties of the composite material.

scholarly journals Leveraging Automated Image Analysis Tools to Transform Our Capacity to Assess Status and Trends of Coral Reefs

2019 ◽  
Vol 6 ◽  
Author(s):  
Ivor D. Williams ◽  
Courtney S. Couch ◽  
Oscar Beijbom ◽  
Thomas A. Oliver ◽  
Bernardo Vargas-Angel ◽  
...  
Keyword(s):  
Image Analysis ◽  
Coral Reefs ◽  
Automated Image Analysis ◽  
Analysis Tools ◽  
Status And Trends

scholarly journals The expansion of TRIAC to TRIACII code for track measurements from SSNT detectors

2020 ◽  
Vol 15 ◽  
pp. 180
Author(s):  
D. L. Patiris ◽  
K. Blekas ◽  
K. G. Ioannides
Keyword(s):  
Image Analysis ◽  
Solid State ◽  
Hough Transform ◽  
Alpha Particles ◽  
Mode I ◽  
Mode Ii ◽  
Mean Intensity ◽  
Nuclear Track Detectors ◽  
Analysis Tools ◽  
Energy Discrimination

The expansion of TRIAC to TRIACII code will be described. Both codes have been developed for recognition and parameters measurements of particles’ tracks from images of Solid State Nuclear Track Detectors. While the first program considers the tracks as circles, TRIACII code, using image analysis tools, counts the number of tracks and depending on the current working mode classifies them according to their radii (Mode I- circular tracks) or their axis (Mode II- elliptical tracks), their mean intensity value (brightness) and their orientation. Hough transform techniques are used for the estimation of tracks’ number and their parameters which are able to give results even for overlapping tracks. The new program has been used for radon’s progeny behavior and alpha particles’ energy discrimination.

scholarly journals The Wood Image Analysis and Dataset (WIAD): open‐access visual analysis tools to advance the ecological data revolution

2021 ◽  
Author(s):  
Tim Rademacher ◽  
Bijan Seyednasrollah ◽  
David J. Basler ◽  
Jian Cheng ◽  
Tessa Mandra ◽  
...  
Keyword(s):  
Image Analysis ◽  
Open Access ◽  
Visual Analysis ◽  
Ecological Data ◽  
Analysis Tools

Quantitative evaluation of impact cracks near the borehole based on 2D image analysis and fractal theory

Geothermics ◽  
2022 ◽  
Vol 100 ◽  
pp. 102335
Author(s):  
Yanliang Li ◽  
Jianming Peng ◽  
Ling Zhang ◽  
Jian Zhou ◽  
Chaoyang Huang ◽  
...  
Keyword(s):  
Image Analysis ◽  
Quantitative Evaluation ◽  
Fractal Theory

Einfluss der elektrochemischen Doppelschicht auf die Sorption und den Transport von Chlorionen im Zementstein / Influence of the electrochemical double layer on sorption and transport of chlorides in hardened cement paste

2000 ◽  
Vol 6 (4) ◽  
pp. 415-428
Author(s):  
O. Wowra ◽  
M.J. Setzer
Keyword(s):  
Double Layer ◽  
Cement Paste ◽  
Building Materials ◽  
Pore Solution ◽  
Chloride Ions ◽  
Transport Processes ◽  
Cement Matrix ◽  
Hardened Cement ◽  
Hardened Cement Paste ◽  
Electrochemical Double Layer

Abstract Besides the formation of Friedel salt the transport and binding of chlorides in concrete is mainly defined by the electrochemical double layer at the interface between cement matrix and pore solution. Due to the alkaline pore solution the surface of hardened cement paste is negatively charged which may change to positive values by the potential regulating calcium ions. Inverting of the surface charge leads to an attraction of anions and therefore, to an adsorption of chloride ions in the diffuse part of the electrochemical double layer. Influence from outside like sulphates and carbon dioxide may lead to a decomposition of Friedel salt. Apart from these effect temperature, pH-value and certain environmental conditions affects the electrochemical double layer as well. The chloride equilibrium is mainly controlled by adsorbed ions in the electrochemical double layer. The model presented here is relevant for the assessment of ion transport processes in mineral building materials. Continuing investigations may lead to optimize transport models and a better evaluation of the critical chloride threshold value in reinforced concrete.

scholarly journals SEM Image Analysis in Permeable Recycled Concretes with Silica Fume. A Quantitative Comparison of Porosity and the ITZ

Materials ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2201 ◽  
Author(s):  
Manuel J. Chinchillas-Chinchillas ◽  
Carlos A. Rosas-Casarez ◽  
Susana P. Arredondo-Rea ◽  
José M. Gómez-Soberón ◽  
Ramón Corral-Higuera
Keyword(s):  
Image Analysis ◽  
Silica Fume ◽  
Cement Paste ◽  
Chemical Elements ◽  
Energy Dispersive Spectrometer ◽  
Recycled Aggregates ◽  
Porous Network ◽  
Transition Zones ◽  
Sem Image ◽  
Coarse Aggregates

Recycled aggregates (RA) from construction and demolition can be used in permeable concretes (PC), improving the environment. PCs have a significant porous network, their cement paste and the interaction between the paste and the RA establishing their strength. Therefore, it is important to evaluate the porosity in the interfacial transition zones. The porosity of the cement paste, the aggregate and the interfacial transitional zones (ITZ) of a PC with recycled coarse aggregates (RCA) and silica fume (SF) is measured by means of image analysis–scanning electron microscope (IA)-(SEM) and by mapping the chemical elements with an SEM-EDS (energy dispersive spectrometer) detector microanalysis linked to the SEM and, as a contrast, the mercury intrusion porosimetry technique (MIP). In the IA process, a “mask” was created for the aggregate and another for the paste, which determined the porosity percentage (for the anhydrous material and the products of hydration). The results showed that using SF caused a reduction (32%) in the cement paste porosity in comparison with the PC with RA. The use of RA in the PC led to a significant increase (190%) in the porosity at different thicknesses of ITZ compared with the reference PC. Finally, the MIP study shows that the use of SF caused a decrease in the micropores, mesopores and macropores.

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