Nanoporous metal phosphate (NP-MPO) materials are being developed for removal of contaminant oxyanions (As(OH)O32-, CrO42-, and TcO4-), 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 demonstrate: i) incorporation of NP-MPO materials requires additional water in the concrete formulation, which decreases the compressive strength, ii) the high reactive surface area afforded by the fine NP-MPO particles increases the compressive strength, and iii) overall, the compressive strength of concrete waste forms is equal to or greater than standard concrete as a function of the water/cement ratio.
Revised: June 12, 2008 |
Published: May 5, 2008
Citation
Wellman D.M., K.E. Parker, S.V. Mattigod, and G.E. Fryxell. 2008.Effect of Incorporating Nanoporous Metal Phosphate Materials on the Compressive Strength of Portland Cement.Research Letters in Materials Science 2008.PNNL-SA-48899.doi:10.1155/2008/238736