Changes in chemical structure of oxidation reaction layers of Zircaloy-4 and Ti by micro X-ray diffractometry

Park, Yang-Soon; Ha, Yeong-Keong; Han, Sang Do; Jee, Kwang Yong; Kim, Won‐Ho

doi:10.1016/j.jnucmat.2007.02.006

Cited by 1 publication

(1 citation statement)

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“…This is because the film thickness on the titanium surface changes and the light reflected from the metal surface causes interference. It has been reported that the color of the metal surface appears yellow at 300 • C, purple at 400 • C, blue at 500 • C, gray at 600-800 • C, and white at 900-1000 • C [19][20][21]. This study aimed to utilize these discoloration characteristics to estimate the heating temperature of concrete by depth.…”

Section: Discoloration Characteristics Of Titaniummentioning

confidence: 99%

A Method for Instant Estimation of the Temperature Experienced by Fire-Damaged Reinforced Concrete Structures Using Titanium

Sim

Ryu

2020

Materials

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When a concrete structure is exposed to fire, its structural safety is significantly compromised due to the spalling of members and scaling of concrete. In addition, its durability is substantially reduced due to certain chemical changes such as the dehydration of Ca(OH)2, the main hydration product of concrete, and the rehydration of CaO. Therefore, when fire damage occurs to a reinforced concrete (RC) building, rapid diagnosis and evaluation techniques are required for immediate repair and reinforcement, requiring a crucial step of quantitatively determining the heating temperature. This study aims to demonstrate a method of estimating the heating temperature experienced by fire damaged RC buildings. The experiments utilized two short RC column specimens with embedded titanium strips. The discoloration characteristics of titanium at high temperatures provided a quick, accurate, and simple mechanism for the estimation of the heating temperature by depth. Empirical equations were derived to estimate the heating temperature as a function of the discoloration characteristics of titanium. Thereafter, a comparison of this estimated temperature with the actual heating temperature measured using thermocouples revealed an average error of less than 20 °C, thereby demonstrating a significantly good correlation and an extremely high reliability of the proposed method.

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Section: Discoloration Characteristics Of Titaniummentioning

confidence: 99%