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Research Letters in Materials Science
Volume 2008, Article ID 238736, 4 pages
http://dx.doi.org/10.1155/2008/238736
Research Letter

Effect of Incorporating Nanoporous Metal Phosphate Materials on the Compressive Strength of Portland Cement

The Pacific Northwest National Laboratory, P.O. Box 999, K3-62 Richland, WA 99352, USA

Received 12 December 2007; Accepted 27 February 2008

Academic Editor: Steven Suib

Copyright © 2008 Dawn M. Wellman et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Nanoporous metal phosphate (NP-MPO) materials are being developed for removal of contaminant oxyanions (As(OH) O 3 2 , C r O 4 2 , and T c O 4 ), and cations (mercury, cadmium, and lead) from water and waste streams. Following sequestration, incorporation of metal laden NP-MPOs as a portion of cement formulation would provide an efficient and low-cost way to immobilize metal laden NP-MPOs in an easily handled waste form suitable for permanent disposal. There are no known investigations regarding the incorporation of NP-MPOs in concrete and the effects imparted on the physical and mechanical properties of concrete. Results of this investigation demonstrated that incorporating of NP-MPO materials requires additional water in the concrete formulation which decreases the compressive strength. Thus, incorporation of NP-MPOs in concrete may not serve as an efficient means for long-term disposal.