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Journal of Engineering
Volume 2013, Article ID 361582, 7 pages
Research Article

Fire Resistance of Sewage Sludge Ash Blended Cement Pastes

Chemistry Department, Faculty of Science, Minia University, Minia, Egypt

Received 1 September 2012; Accepted 15 December 2012

Academic Editor: Lucian Dascalescu

Copyright © 2013 M. A. Tantawy 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.


The aim of the present study is to investigate the hydration characteristics and the fire resistance of sewage sludge ash blended cement pastes by the determination of compressive strength, bulk density, and total porosity in addition to XRD and SEM techniques. Sewage sludge ash modifies the hydration of cement because of its pozzolanic reaction with portlandite favoring the formation of crosslinked fibrous calcium silicate of low Ca/Si ratio. Hence, it was concluded that thermal damage of cement pastes after the exposure to high treatment temperatures (i.e., crack formation and loss of mechanical properties) was effectively reduced with sewage sludge as content up to 20 wt% because of that the presence of crosslinked fibrous calcium silicate strengthens the cement matrix.