In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
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.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Feedback via Email
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: Carbon Dioxide in Hydrated Portland Cement
Author(s): W. F. Cole and B. Kroone
Publication: Journal Proceedings
Appears on pages(s): 1275-1296
Abstract:A study is made of the wav in which carbon dioxide is held in carbonated samples of portland cement mortar and of calcium silicate hydrate using differential thermal, ther-mogravimetric, and x-ray diffraction methods. The results indicate that the carbon dioxide is chemically bound as calcium carbonate, largely in the form of poorlycrystallized voterite, aragonite, and calcite, and not as a si licate mineral. The carbonate minerals are intimately associated with the siliceous residue that results from the carbonation of the hvdrated cement minerals. They react with this residue when the samples are heated to yield the unstable larnite (@KaO*SiO2) which, at room temperature, is discernible in a rapidly cooled sample. The temperature of the reaction is wel l below that at which well-crystalized calcite and quartz react to produce wollastbnite (CaO*SiO2). Some conclusions are drawn as to the mechanism by which the carbonation of cement minerals could take place.
Click here to become an online Journal subscriber