Interactions between Organic and Inorganic Phases in PA- and PU/PA-Modified-Cement-Based Materials
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 10
Abstract
In this paper, two types of acrylics, polyacrylate (PA), a copolymer of methyl methacrylate, acrylic acid, and others, and polyurethane-modified PA (PU/PA), are investigated in their interactions with inorganic phases in polymer-modified cement-based mixtures and in their mechanisms in improving both mechanical properties and durability of cement-based materials. In these investigations, the total organic carbon content (TOC) method is used to study the adsorption of polymer particles in mixtures. An aqueous tube test, x-ray diffraction (XRD), thermal gravity analysis (TGA), and Fourier transform infrared spectroscopy (FTIR) are employed to study the possible chemical reactions between the latexes and cement hydrates. Scanning electron microscopy (SEM) and energy-dispersive x-ray analysis (EDX) are used to observe the film formation and the final morphology of PA- and PU/PA-modified mortars. PU/PA latex is found to be relatively stable, and the behaviors of PU/PA-modified mixtures can be explained by Ohama’s model. On the other hand, molecules of PA latex are very active in cement-based mixtures. Moreover, the normal assumption that polymer particles are uniformly dispersed in aqueous phase is invalid in PA-modified mixtures. Chemical reactions occur between PA latex and cement hydrates, especially calcium hydroxide. In the final comatrix of PA-modified mortar, no PA film with high purity can be distinguished by SEM/EDX. Based on the findings, a new model with a four-step procedure is proposed to explain the behaviors and properties of PA latex-modified cement-based materials.
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Acknowledgments
Financial supports from a China Basic Research Grant, Basic Research on Environmentally Friendly Contemporary Concrete (UNSPECIFIED2009CB623200) and from the Research Grants Council (RGC) under UNSPECIFIEDRPC07/08.EG05 are gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 10 • October 2011
Pages: 1412 - 1421
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Aug 9, 2010
Accepted: Mar 2, 2011
Published online: Mar 4, 2011
Published in print: Oct 1, 2011
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