Assessment of optimum threshold and particle shape parameter for the image analysis of aggregate size distribution of concrete sections

2014-02-01
Ozen, Murat
Güler, Murat
Show full item record
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
126
views
0
downloads
Aggregate gradation is one of the key design parameters affecting the workability and strength properties of concrete mixtures. Estimating aggregate gradation from hardened concrete samples can offer valuable insights into the quality of mixtures in terms of the degree of segregation and the amount of deviation from the specified gradation limits. In this study, a methodology is introduced to determine the particle size distribution of aggregates from 2D cross sectional images of concrete samples. The samples used in the study were fabricated from six mix designs by varying the aggregate gradation, aggregate source and maximum aggregate size with five replicates of each design combination. Each sample was cut into three pieces using a diamond saw and then scanned to obtain the cross sectional images using a desktop flatbed scanner. An algorithm is proposed to determine the optimum threshold for the image analysis of the cross sections. A procedure was also suggested to determine a suitable particle shape parameter to be used in the analysis of aggregate size distribution within each cross section. Results of analyses indicated that the optimum threshold hence the pixel distribution functions may be different even for the cross sections of an identical concrete sample. Besides, the maximum ferret diameter is the most suitable shape parameter to estimate the size distribution of aggregates when computed based on the diagonal sieve opening. The outcome of this study can be of practical value for the practitioners to evaluate concrete in terms of the degree of segregation and the bounds of mixture's gradation achieved during manufacturing.
Mechanical Engineering, Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials
https://hdl.handle.net/11511/47544
OPTICS AND LASERS IN ENGINEERING
Department of Civil Engineering, Article

Suggestions

Characterization of chiral metamaterial sensor with high sensitivity
Dalgac, Sekip; BAKIR, MEHMET; KARADAĞ, FARUK; ÜNAL, EMİN; KARAASLAN, MUHARREM; Sabah, Cumali (Elsevier BV, 2020-02-01)
In this study, a chiral metamaterial sensor applications are created by placing asymmetrically two meander line front and back side of the substrate layer. Characterization of the dielectric constant, thickness and loss tangent have been performed both in simulation and experimental methods. Different Arlon type materials used for showing the effects of dielectric constant on transmission coefficient. Obtained bandwidths for characterization are greater than the similar studies which verifyies increased sen...
Calculation of the heat capacity Cp from the temperature-induced and pressure-induced Raman frequency shifts for solid benzene, naphthalene and anthracene
Ozdemir, Hilal; Yurtseven, Hasan Hamit (Elsevier BV, 2019-02-01)
The heat capacity Cp is calculated from the temperature-induced and pressure-induced Raman frequency shifts by means of the mode Griineisen parameter for the I-II transition of solid benzene, naphthalene and anthracene. For this calculation, contributions to Cp are considered due to the six lattice modes of solid benzene, six librational modes of naphthalene and, six phonons and nine vibrons of anthracene with their mode Griineisen parameters at various temperature (P = 0) and pressures (T=300 K). Our calcu...
Analysis of composite nanoparticles with surface integral equations and the multilevel fast multipole algorithm
Ergül, Özgür Salih (IOP Publishing, 2012-06-01)
Composite nanoparticles involving multiple parts with different material properties are analyzed rigorously with surface integral equations and the multilevel fast multipole algorithm. Accuracy and efficiency of the developed parallel implementation are demonstrated on spherical objects with dielectric, perfectly conducting, plasmonic, and double-negative regions. Significant effects of the formulation on numerical solutions are also considered to show the tradeoff between the efficiency and accuracy.
Full-wave analysis of microstrip lines on a highly lossy substrate
Prakash, VVS; Kuzuoğlu, Mustafa; Mittra, R (Wiley, 2003-06-05)
The finite-element method has been used for analyzing open microstrip line structures on highly lossy substrates. The geometry descritization has been carried out by using quadrilateral elements, and the spurious solutions art avoided by employing tangential vector formulation. The difficulties associated with finding the propagation constant of a highly lossy structure 13.1, solving a generalized eigenvalue problem are discussed. A methodology is presented,for a fast and efficient computation of the attenu...
Density functional theory study on the structural properties and energetics of Zn(m)Te(n) microclusters
Pekoez, Rengin; Erkoç, Şakir (Elsevier BV, 2008-08-01)
Density functional theory calculations with B3LYP exchange-correlation functional using CEP-121G basis set have been carried out in order to elucidate the structural properties and energetics of neutral zinc telluride clusters, Zn(m)Te(n)(m + n <= 6), in their ground states. The geometric structures, binding energies, vibrational frequencies and infrared intensities, Mulliken charges on atoms, HOMO and LUMO energies, the most possible dissociation channels and their corresponding energies for the clusters h...
Citation Formats
M. Ozen and M. Güler, “Assessment of optimum threshold and particle shape parameter for the image analysis of aggregate size distribution of concrete sections,” OPTICS AND LASERS IN ENGINEERING, pp. 122–132, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47544.
METU IIS - Integrated Information Service open@metu.edu.tr