scholarly journals Integration of in situ imaging and chord length distribution measurements for estimation of particle size and shape

2016 ◽  
Vol 144 ◽  
pp. 87-100 ◽  
Author(s):  
Okpeafoh S. Agimelen ◽  
Anna Jawor-Baczynska ◽  
John McGinty ◽  
Jerzy Dziewierz ◽  
Christos Tachtatzis ◽  
...  
Keyword(s):  
Particle Size ◽  
Length Distribution ◽  
Chord Length ◽  
Size And Shape ◽  
Chord Length Distribution ◽  
Particle Size And Shape ◽  
In Situ Imaging

scholarly journals Effect of Pre-Shear on Agglomeration and Rheological Parameters of Cement Paste

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2173
Author(s):  
Mareike Thiedeitz ◽  
Inka Dressler ◽  
Thomas Kränkel ◽  
Christoph Gehlen ◽  
Dirk Lowke
Keyword(s):  
Yield Stress ◽  
Mixing Time ◽  
Length Distribution ◽  
Chord Length ◽  
Rheological Parameters ◽  
Reflectance Measurement ◽  
Time Dynamic ◽  
Chord Length Distribution ◽  
In Situ Investigation

Cementitious pastes are multiphase suspensions that are rheologically characterized by viscosity and yield stress. They tend to flocculate during rest due to attractive interparticle forces, and desagglomerate when shear is induced. The shear history, e.g., mixing energy and time, determines the apparent state of flocculation and accordingly the particle size distribution of the cement in the suspension, which itself affects suspension’s plastic viscosity and yield stress. Thus, it is crucial to understand the effect of the mixing procedure of cementitious suspensions before starting rheological measurements. However, the measurement of the in-situ particle agglomeration status is difficult, due to rapidly changing particle network structuration. The focused beam reflectance measurement (FBRM) technique offers an opportunity for the in-situ investigation of the chord length distribution. This enables to detect the state of flocculation of the particles during shear. Cementitious pastes differing in their solid fraction and superplasticizer content were analyzed after various pre-shear histories, i.e., mixing times. Yield stress and viscosity were measured in a parallel-plate-rheometer and related to in-situ measurements of the chord length distribution with the FBRM-probe to characterize the agglomeration status. With increasing mixing time agglomerates were increasingly broken up in dependence of pre-shear: After 300 s of pre-shear the agglomerate sizes decreased by 10 µm to 15 µm compared to a 30 s pre-shear. At the same time dynamic yield stress and viscosity decreased up to 30% until a state of equilibrium was almost reached. The investigations show a correlation between mean chord length and the corresponding rheological parameters affected by the duration of pre-shear.

scholarly journals Image analysis framework with focus evaluation for in situ characterisation of particle size and shape attributes

2018 ◽  
Vol 191 ◽  
pp. 208-231 ◽  
Author(s):  
Javier Cardona ◽  
Carla Ferreira ◽  
John McGinty ◽  
Andrew Hamilton ◽  
Okpeafoh S. Agimelen ◽  
...  
Keyword(s):  
Particle Size ◽  
Image Analysis ◽  
Analysis Framework ◽  
Size And Shape ◽  
Particle Size And Shape

In-Situ Particle Size and Shape Analysis During Flame Synthesis of Nanosize Powders

1997 ◽  
pp. 170-186 ◽  
Author(s):  
S. Farquharson ◽  
S. Charpenay ◽  
M. B. DiTaranto ◽  
P. A. Rosenthal ◽  
W. Zhu ◽  
...  
Keyword(s):  
Particle Size ◽  
Shape Analysis ◽  
Flame Synthesis ◽  
Size And Shape ◽  
Particle Size And Shape

scholarly journals Estimation of particle size distribution and aspect ratio of non-spherical particles from chord length distribution

2015 ◽  
Vol 123 ◽  
pp. 629-640 ◽  
Author(s):  
Okpeafoh S. Agimelen ◽  
Peter Hamilton ◽  
Ian Haley ◽  
Alison Nordon ◽  
Massimiliano Vasile ◽  
...  
Keyword(s):  
Particle Size ◽  
Aspect Ratio ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Length Distribution ◽  
Chord Length ◽  
Spherical Particles ◽  
Chord Length Distribution

scholarly journals Chord length distribution to particle size distribution

AIChE Journal ◽  
2016 ◽  
Vol 62 (12) ◽  
pp. 4215-4228 ◽  
Author(s):  
Ajinkya V. Pandit ◽  
Vivek V. Ranade
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Length Distribution ◽  
Chord Length ◽  
Chord Length Distribution

Measurement of particle size and shape by FBRM and in situ microscopy

2008 ◽  
Vol 63 (19) ◽  
pp. 4656-4675 ◽  
Author(s):  
Michel Kempkes ◽  
Jan Eggers ◽  
Marco Mazzotti
Keyword(s):  
Particle Size ◽  
Size And Shape ◽  
Particle Size And Shape
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