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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Effect of Carbon Dioxide on Fresh Concrete
Author(s): J. A. Kauer and R. L. Freeman
Publication: Journal Proceedings
Appears on pages(s): 447-454
Keywords: no keywords
Abstract:Fresh concrete specimens were subjected to carbon dioxide immediately after molding. These specimens were then cured in various humidities and tem-peratures in CO2 atmospheres ranging from 4.5 to 18 percent for 24 to 96 hr. Tests were then made on hardness of surface, depth of carbonation, amount of carbonation on surface as compared with unexposed specimen, and compressive strengths. These tests indicated that fresh concrete exposed to CO, resulting from the use of salamanders or other heating devices which exhaust the flue gases directly into the room, have soft surfaces of various depths depending on the concentration of CO2, the temperature at which concrete is cured, and the humidities under which it is cured. The authors found that chemically produced hardeners have no appreciable effect on the surface. Grinding the surface is the only way to restore or salvage the concrete.
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