A 43Ca and 13C NMR study of the chemical interaction between poly(ethylene-vinyl acetate) and white cement during hydration |
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| Authors: | MacDonald Jennifer L Werner-Zwanziger Ulrike Chen Banghao Zwanziger Josef W Forgeron Dean |
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| Affiliation: | aDepartment of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J3;bInstitute for Research in Materials, Dalhousie University, Halifax, Nova Scotia, Canada B3H 4J3;cDepartment of Civil and Resource Engineering, Dalhousie University, Halifax, Nova Scotia, Canada B3J 2X4 |
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| Abstract: | 43Ca and 13C NMR methods were used to study the chemical interaction of poly(ethylene–vinyl acetate) (PEVAc) admixture in commercial-grade white cement. From 43Ca NMR it is shown both that PEVAc induces modest changes in the hydrated cement structure, and that hydrated commercial cement is significantly more complex than models that have been used for its structure in past work. The 13C NMR results show that the PEVAc hydrolysis occurs early in the cement hydration acceleration period, with a rate well-fit by an exponential decay using a time constant of 6±1 days. |
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| Keywords: | Calcium-43 NMR Cement Latex |
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