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A nanochemomechanical investigation of carbonated cement paste

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dc.contributor.advisor Franz-Josef Ulm. en_US Vanzo, James (James F.) en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Civil and Environmental Engineering. en_US 2010-05-25T21:11:34Z 2010-05-25T21:11:34Z 2009 en_US 2009 en_US
dc.description Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2009. en_US
dc.description Cataloged from PDF version of thesis. en_US
dc.description Includes bibliographical references (p. 273-291). en_US
dc.description.abstract Concrete, and in particular its principal component, cement paste, has an interesting relation with carbon dioxide. Concrete is a carbon dioxide generator-- it is estimated that 5-10% of atmospheric CO₂ comes from this source. Carbon dioxide is a concrete corroder-- it can penetrate into the porous concrete structure and cause great physical and chemical changes. Finally, a new engineering direction suggests the use of concrete as a carbon sequesterer. Carbon sequestration is the technique of containing large quantities of carbon dioxide in the fashion of waste control. Given the escalating quantity of carbon dioxide in our atmosphere, this technology is gaining increasing attention and may be implemented in cement paste-lined, defunct oil wells. Such a setup involves an interface between cement paste and large quantities of CO₂, and corrosion of the cement paste is inevitable. This would make carbon sequestration the first technology to employ carbonated cement paste as a structural material and, as such, requires a well-developed knowledge of both the processes and the product. The goal of this thesis is an investigation of the fundamental properties of carbonated cement paste. For a set of class G oil well cement pastes carbonated under wet-supercritical CO₂ and CO₂-saturated water, we find that the fundamental building blocks of the carbonated material are calcium carbonate, decalcified C-S-H, and silica gel. en_US
dc.description.abstract (cont.) The characteristic size of the calcium carbonate is below the micron scale, while the silica gel often reaches up to 10-20[mu]m in extension. The microstructure of these products is highly disordered. We arrive at these conclusions as the result of a dual chemical-mechanical analysis at the nanoscale in which statistical electron probe microanalysis (EPMA) and statistical nanoindentation analysis are employed. The development of a statistical EPMA method for cementitious materials is an original method of this thesis. en_US
dc.description.statementofresponsibility by James Vanzo. en_US
dc.format.extent 291 p. en_US
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.rights.uri en_US
dc.subject Civil and Environmental Engineering. en_US
dc.title A nanochemomechanical investigation of carbonated cement paste en_US
dc.type Thesis en_US S.M. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Civil and Environmental Engineering. en_US
dc.identifier.oclc 612432822 en_US

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