Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 23, Issue 7, Pages 2487-2491Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2009.02.005
Keywords
Nano-silica; Portland-cement pastes; Mortars; Fresh properties; Rheology
Categories
Funding
- CAPES, Brazil
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Amorphous nano-silica (nS) particles (0-2.5 wt%) by cement were incorporated in cement pastes and mortars, and their effect on the fresh state behaviour was analysed. Rheological tests showed that after 75 min from the mixing start, the mortar having 2.5 wt% nS shows insufficient flowability to allow its continuous monitoring in a Viskomat PC viscometer. The influence of nS content was better observed on yield stress when compared with plastic viscosity Values (the first increased about 66.5% while the latter just increased 3.6%). With nS addition, spread, setting time and the moment to reach the maximum temperature decreased 33%, 60% and 51.3%, respectively, when compared with samples without nS. X-ray diffraction showed presence Of Calcium hydroxide after 9 h in the sample with 2.5 wt% nS. The air content increased 79% and apparent density decreased 2.4% when nS was added. (C) 2009 Elsevier Ltd. All rights reserved.
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