|Title||Photocatalytic efficiency of cement-based materials: Demonstration of proposed test method|
|Publication Type||Journal Article|
|Year of Publication||2015|
|Authors||AR Jayapalan, BY Lee, EM Land, MH Bergin, and KE Kurtis|
|Journal||Aci Materials Journal|
|Pagination||219 - 228|
Copyright © 2015, American Concrete Institute. All rights reserved. While there is an increasing interest in using photocatalytic cement-based materials, a lack of an appropriate standard procedure for testing the photocatalytic activity and efficiency of such materials makes comparisons among materials and data from different sources challenging. Current standard test methods are not appropriate for assessing photocatalytic nitrogen oxide conversion by cementitious materials because the standards do not consider surface properties of cementitious materials, nor are the test conditions appropriate for evaluation of cementitious materials. Therefore, the main objective is to propose a standard procedure for assessing the photocatalytic activity of cement mixtures with TiO<inf>2</inf> additives and to define a parameter-the photocatalytic efficiency factor (PEF)-that could be used to compare the photocatalytic activity of different TiO<inf>2</inf> cement mixtures, even for extended exposure conditions. The use of PEF is demonstrated, and values of PEF ranging from 8.40 to 51.55 μmol·h<sup>-1</sup>·m<sup>-2</sup> (0.78 to 4.79 μmol·h<sup>-1</sup>·ft<sup>-2</sup>) was observed for mixtures with TiO<inf>2</inf> up to 15% replacement.
|Short Title||Aci Materials Journal|