Measurement Device and Characteristics of Diffusion Coefficient of Carbon Dioxide in Concrete

The durability of concrete structure is greatly affected by the carbonation of concrete. The rate of carbonation depends largely on the diffusivity of carbon dioxide in concrete. The purpose of this study is to: (1) develop a measurement device for the carbon dioxide diffusion coefficients in concrete; and (2) identify the diffusion coefficients of carbon dioxide for various concrete materials. Several series of tests were planned and conducted. It was shown that the diffusion of carbon dioxide reached a steady state within approximately 5 hours after exposure. The current test results indicate that the diffusion coefficient increases with an increase of the water-cement ratio (w/c) and decreases with an increase of relative humidity (RH) at the same w/c. The content of aggregates also influences the diffusivity of carbon dioxide in concrete. The study found that the diffusion coefficient of cement paste is much larger than that of concrete or mortar. The quantitative values of the diffusivity of carbon dioxide for various materials are presented. This study allows for a more realistic assessment of the carbonation process and carbonation depth in concrete structures. This is very important for the durability assessment and service-life prediction of concrete structures.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/13846872
• Authors:
  • Jung, Sung H
  • Lee, Myung Kue
  • Oh, Byung Hwan
• Publication Date: 2011

Language

• English

Media Info

• Media Type: Print
• Features: Figures; Photos; References; Tables;
• Pagination: pp 589-595
• Serial:
  • ACI Materials Journal
  • Volume: 108
  • Issue Number: 6
  • Publisher: American Concrete Institute (ACI)
  • ISSN: 0889-325X
  • Serial URL: https://www.concrete.org/publications/acimaterialsjournal.aspx

Subject/Index Terms

• TRT Terms: Aggregates; Cement paste; Concrete structures; Durability; Humidity; Moisture content; Service life; Water cement ratio
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01361059
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 25 2012 2:21PM