Thesis
Carbon dioxide and water speciation in hydrated cements, a focus on sustainability
Washington State University
Master of Science (MS), Washington State University
2009
Handle:
https://hdl.handle.net/2376/103689
Abstract
Concrete, the most used building material in the world contributes to the carbon dioxide releases significantly in the manufacturing of cement, both from the calcinations chemical process and from energy use. But concrete can reabsorb carbon dioxide by carbonation process in which the hydrated cements react with carbon dioxide to form solid calcite. Many researchers have investigated the carbonation under different circumstances for the carbon absorption potential by concrete. Recently, novel concrete mixes are being adopted to address many environmental concerns, and one of these is pervious concrete. With its large surface areas exposed to ambient air, the reactions within pervious concrete are complex. Past concrete chemistry studies interpreted experimental data based on traditional concrete – use analyses, but these interpretations need alterations to include modified reaction kinetics and equilibriums within these novel uses which have different environmental exposure. This research focuses on the carbon dioxide and water speciation in concrete, specifically on other carbon dioxide sequestration species and on how water sequestration in the hydrated cement paste might vary for novel uses of concrete such as pervious concrete with high exposure to ambient air. Temperature Programmed Desorption (TPD) was used to analyze early age cement samples under various environmental conditions. It was shown that significant amounts of carbon dioxide species other than calcium carbonate do exist in cement paste samples with respect to the stoichiometric potential for reversing the calcination process. It was found that there was a substantial decrease in the formation of calcium hydroxide in the samples representing these novel uses exposed to ambient environmental conditions as compared to traditional early age cement samples.
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Details
- Title
- Carbon dioxide and water speciation in hydrated cements, a focus on sustainability
- Creators
- Lu Liu
- Contributors
- Liv M. Haselback (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525394901842
- Language
- English
- Resource Type
- Thesis