Measuring the Diffusion Coefficient of Paste and Concrete by Using Dental X-ray Equipment

Autor: Amir Behravan, M. Tyler Ley, Dan Cook, Qinang Hu, Anna Rywelski, Russell Brorsen
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: CivilEng, Vol 4, Iss 1, Pp 224-247 (2023)
Druh dokumentu: article
ISSN: 2673-4109
DOI: 10.3390/civileng4010014
Popis: The penetration of ions plays an important role in the durability of concrete structures. This study aims to establish the feasibility of using dental X-ray equipment to measure the concentration and penetration of iodide within cementitious systems. This technique is known as checking ion penetration (CHIP). This test uses iodide as a tracer because it has a high electron density, and so it can be observed with X-ray imaging as it penetrates the concrete. Concentration profiles from CHIP are used to calculate the apparent diffusion coefficient (Dac). These results are similar to measurements from bulk chloride ponding tests. The Dac is used to predict the service life or evaluate the quality of an as-built concrete structure or concrete mixture. Because of the wide availability of dental equipment, CHIP shows promise to be used as a method to measure the in-place quality control of the concrete.
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