Voidage assessment of concrete using digital image processing

Abstract

This paper describes an objective means of assessing the amount of voidage found within the curved surface of concrete core samples that has been developed by mechanically rolling core samples above a modified flatbed desktop scanner so as to align with the scanning charged coupled device illuminated cross-head. A freely distributed software program was used to process all images to determine percentage voidage and voidage size distribution among other attributes. This work shows that the size, shape and distribution of air voids and aggregate characteristics can be determined using core samples scanned over modified flatbed desktop scanners. A proprietary office desktop scanner with a resolution of 1200 dpi was used.

[Retracted] Processing Methods for Digital Image Data Based on the Geographic Information System

“…erefore, it is necessary to establish a discriminating boundary that divides the feature space. Mathematically, it is a problem of establishing a discriminating function [15]. e establishment of the distance discriminating function is based on the premise that the spectral features of the ground objects are distributed in a cluster manner in the feature space, that is, it is assumed that the probability distribution of the feature vector is not known.…”

Measurement of Voidage of Sinter Ores in the Tubes

“…S. Sharma et al used a water substitution method to determine bed voidage and typical bed voidage was observed within 0.1 and 0.19 m inner diameter columns, We decided to measure the bulk bed voidage which was useful in determining the best height of the sintering layer from their typical bed voidage. Roblee et al, Benenati et al, Govindarao, et al, Latham et al, Caulkin et al, du Toit, True et al, and Mueller − have studied the void fraction in packed beds. Gotz et al, Poux et al, Zhiyao et al, Farber et al, Forsmo and Vuori, Nguyen et al, and Pahk and Klinzing measured the voidage in packed beds.…”