A Stludy of the Interfacial Region Between Cement Paste and Aggregate in Concrete

1987 ◽  
Vol 114 ◽  
Author(s):  
Karen L. Scrivener ◽  
Alison K. Crumbie ◽  
P. L. Pratt
Keyword(s):  
Image Analysis ◽  
Cement Paste ◽  
Quantitative Image Analysis ◽  
Interfacial Region ◽  
Interfacial Zone ◽  
Preliminary Results ◽  
Quantitative Image

ABSTRACTThe application of quantitative image analysis to the measurenent of microstructural gradients in the interfacial zone in concrete is described. Some preliminary results are presented and discussed.

An Approach to Quantitative Image Analysis for Cement Pastes

1994 ◽  
Vol 370 ◽  
Author(s):  
Yuting Wang ◽  
Sidney Diamond
Keyword(s):  
Image Analysis ◽  
Calcium Hydroxide ◽  
Cement Paste ◽  
Quantitative Image Analysis ◽  
Feature Analysis ◽  
Hole Filling ◽  
Gray Scale ◽  
Cement Pastes ◽  
Quantitative Image ◽  
Average Size

AbstractCement paste microstructure as revealed in backscatter SEM presents a number of inherent difficulties that interfere with implementing quantitative image analysis. An approach to overcoming these difficulties is presented, involving gray scale segmentation coupled with application of a hole filling algorithm. Using this approach it is possible to isolate the unhydrated and hydrated portions of phenograins separately, and to combine them for analysis of combined phenograins. Pores and coarse calcium hydroxide masses may also be isolated for feature analysis. Results are reported on mature cement pastes prepared at two water:cement ratios (w:c 0.45 and w:c 0.30) and with and without superplasticizer. It was found that superplasticizer greatly reduced the content and the average size of “visible pores” and increased the content and the average size of coarse CH particles compared to corresponding plain pastes. The area per hydrated phenograin was much smaller in the lower w:c ratio pastes and higher in superplasticized pastes. Among the solid features measured, unhydrated cement particles had the smallest circularity values (at about 2.7) and were the most circular features; Hydrated phenograins had the largest circularity values (at 3.5) and were the most elongated features.

Digital simulation of the aggregate–cement paste interfacial zone in concrete

1991 ◽  
Vol 6 (1) ◽  
pp. 196-201 ◽  
Author(s):  
Edward J. Garboczi ◽  
Dale P. Bentz
Keyword(s):  
Cement Paste ◽  
Digital Simulation ◽  
Particle Packing ◽  
Diffusion Reaction ◽  
Interfacial Region ◽  
Interfacial Zone ◽  
Two Dimensional ◽  
Portland Cement Concrete ◽  
Quantitative Image ◽  
Characteristic Features

Researchers using backscattered scanning electron microscopy, along with quantitative image analysis techniques, have clearly demonstrated the existence of a highly porous interfacial region between aggregate particles and the cement paste matrix in ordinary Portland cement concrete. This paper presents the results of a digital-image-based simulation model of this interfacial zone. A dissolution-diffusion-reaction-like cycle of hydrating cement particles is directly simulated using cement particles packed around a simple nonreactive aggregate particle. The model is two-dimensional, as we are comparing to experimental results obtained on two-dimensional images of polished sections. The qualitative features seen experimentally, such as large amounts of porosity and calcium hydroxide in the interfacial zone, are accurately reproduced. A new mechanism, one-sided growth, is proposed, along with the more usual particle-packing ideas, as an explanation of the origin of the characteristic features of the interfacial zone.

Microstructural Gradients in Cement Paste Around Aggregate Particles

1987 ◽  
Vol 114 ◽  
Author(s):  
Karen L. Scrivener ◽  
Ellis M. Gartner
Keyword(s):  
Image Analysis ◽  
Cement Paste ◽  
Interfacial Zone ◽  
Microstructural Investigation ◽  
Analysis Technique ◽  
Single Piece ◽  
Quantitative Image ◽  
Backscattered Electron ◽  
Condensed Silica Fume ◽  
Aggregate Particles

ABSTRACTThe effectiveness of condensed silica fume as a strength enhancing additive in concrete has been attributed to its ability to modify the interfacial zone between paste and aggregate. This paper describes a microstructural investigation of this interface using backscattered electron (bse) imaging combined with quantitative image analysis.Composite specimens were made in which a single piece of aggregate was embedded in cement paste. Granite, dolomite and garnet aggregates were used. After curing, the specimens were sectioned perpendicular to the surface of the aggregate particles and polished. The variation in porosity, amount of anhydrous material and calcium hydroxide (CH), with distance from the aggregate surface was measured. It was found that the porosity increases in the paste close to the interface, while the content of anhydrous grains decreases. No significant increase in CH content was found near the interface.The results confirm the applicability of the bse - image analysis technique, but indicate that the interfaces in specimens prepared in this manner may not be representative of aggregate paste interfaces in concrete.

Characterisation of Microstructure as a Systematic Approach to High Strength Cements

1984 ◽  
Vol 42 ◽  
Author(s):  
Karen L. Scrivener ◽  
K. D. Baldie ◽  
Yick Halse ◽  
P. L. Pratt
Keyword(s):  
Image Analysis ◽  
Fly Ash ◽  
Calcium Hydroxide ◽  
Cement Paste ◽  
Systematic Approach ◽  
High Strength ◽  
Quantitative Image Analysis ◽  
Quantitative Image ◽  
Crack Paths

AbstractUltimately the strength of cement is determined by the properties, amounts and distributions of the phases it contains and by the'way these are bonded together. Here an example is presented of the determination of the amount and distribution of calcium hydroxide, by BEI and quantitative image analysis, in a cement paste and cement/fly ash mixture which had previously been studied by TGA. Examination of crack paths on BEIs of polished cement surfaces gives some indication as to the importance of calcium hydroxide in determining the properties of the cement.

Digital image acquisition, processing, and analysis in a polymer microscopy laboratory

1994 ◽  
Vol 52 ◽  
pp. 454-455
Author(s):  
Vinod K. Berry ◽  
Xiao Zhang
Keyword(s):  
United States ◽  
Image Analysis ◽  
Digital Image ◽  
Image Acquisition ◽  
Image Transmission ◽  
The United States ◽  
Quantitative Image Analysis ◽  
Quantitative Image

In recent years it became apparent that we needed to improve productivity and efficiency in the Microscopy Laboratories in GE Plastics. It was realized that digital image acquisition, archiving, processing, analysis, and transmission over a network would be the best way to achieve this goal. Also, the capabilities of quantitative image analysis, image transmission etc. available with this approach would help us to increase our efficiency. Although the advantages of digital image acquisition, processing, archiving, etc. have been described and are being practiced in many SEM, laboratories, they have not been generally applied in microscopy laboratories (TEM, Optical, SEM and others) and impact on increased productivity has not been yet exploited as well.In order to attain our objective we have acquired a SEMICAPS imaging workstation for each of the GE Plastic sites in the United States. We have integrated the workstation with the microscopes and their peripherals as shown in Figure 1.

scholarly journals Quantitative image analysis of microbial communities with BiofilmQ

2021 ◽  
Author(s):  
Raimo Hartmann ◽  
Hannah Jeckel ◽  
Eric Jelli ◽  
Praveen K. Singh ◽  
Sanika Vaidya ◽  
...  
Keyword(s):  
Image Analysis ◽  
Microbial Communities ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Software Tool ◽  
Image Cytometry ◽  
Quantitative Image Analysis ◽  
Space And Time ◽  
Quantitative Image ◽  
Three Dimensional Space

AbstractBiofilms are microbial communities that represent a highly abundant form of microbial life on Earth. Inside biofilms, phenotypic and genotypic variations occur in three-dimensional space and time; microscopy and quantitative image analysis are therefore crucial for elucidating their functions. Here, we present BiofilmQ—a comprehensive image cytometry software tool for the automated and high-throughput quantification, analysis and visualization of numerous biofilm-internal and whole-biofilm properties in three-dimensional space and time.

Quantitative Image Analysis of Nuclear Chromatin Distribution for Cytological Diagnosis

2011 ◽  
Vol 55 (5) ◽  
pp. 455-459 ◽  
Author(s):  
Ryotaro Jingu ◽  
Masafumi Ohki ◽  
Sumiko Watanabe ◽  
Sadafumi Tamiya ◽  
Setsuo Sugishima ◽  
...  
Keyword(s):  
Image Analysis ◽  
Quantitative Image Analysis ◽  
Cytological Diagnosis ◽  
Nuclear Chromatin ◽  
Quantitative Image
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