Effect of nano-silica on rheology and fresh properties of cement pastes and mortars
authors Senff, L; Labrincha, JA; Ferreira, VM; Hotza, D; Repette, WL
nationality International
journal CONSTRUCTION AND BUILDING MATERIALS
author keywords Nano-silica; Portland-cement pastes; Mortars; Fresh properties; Rheology
keywords NANO-SIO2; PARTICLES; CONCRETE
abstract 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.
publisher ELSEVIER SCI LTD
issn 0950-0618
year published 2009
volume 23
issue 7
beginning page 2487
ending page 2491
digital object identifier (doi) 10.1016/j.conbuildmat.2009.02.005
web of science category Construction & Building Technology; Engineering, Civil; Materials Science, Multidisciplinary
subject category Construction & Building Technology; Engineering; Materials Science
unique article identifier WOS:000266524800003
  ciceco authors
  impact metrics
journal analysis (jcr 2019):
journal impact factor 4.419
5 year journal impact factor 5.036
category normalized journal impact factor percentile 83.285
dimensions (citation analysis):
altmetrics (social interaction):



 


Apoio

1suponsers_list_ciceco.jpg