Advances in Computed Tomography for Geomaterials: GeoX 2010

Quantification of Material Constitution in Concrete by X-ray CT Method

T. Temmyo¹ — Y. Obara²

¹Hazama Corporation2-2-5, Toranomon, Minato-ku [e-mail]

 

²The University of Kumamoto2-39-1, Kurokami, Kumamoto CityKumamoto 860-8555,[e-mail]

ABSTRACT: The x-ray CT (Computed Tomography) technology used for non-destructive testing techniques is able to visualize the internal structure of material objects without damaging them and also to analyze its images quantitatively by using the CT value, a numerical value for a scan image as taken by an x-ray CT scanner. By using these characteristics, this research paper will propose a method for setting a “new boundary CT value (threshold value)” to separate each of the constituent materials, such as aggregate, mortar, void from a CT value histogram of a sectional plane image of concrete. It will also apply this method to a concrete test specimen so as to clarify distribution characteristics of void ratio, aggregate ratio, and the relative density of mortar.

 

KEYWORDS: x-ray CT, scanner, quantitative evaluation, concrete constitution

1. Introduction

The x-ray CT method is an effective method for concrete research and diagnosis. Its effectiveness shows promise for enabling the 3D solid display of steel bar, void, or cracking inside concrete columns.

In contrast, concrete consists of water, cement, sand and gravel. Its mechanical characteristics and durability are influenced by the constituent ...