Effects of Nanomaterials on the Hydration Kinetics and Rheology of Portland Cement Pastes

dc.contributor.author Wang, Kejin
dc.contributor.author Wang, Kejin
dc.contributor.author Tanesi, Jussara
dc.contributor.author Ardani, Ahmad
dc.contributor.department Civil, Construction and Environmental Engineering
dc.date.accessioned 2022-02-01T20:13:11Z
dc.date.available 2022-02-01T20:13:11Z
dc.date.issued 2014-12-12
dc.description.abstract In this paper, effects of nanomaterials on the hydration kinetics and rheology of ordinary Portland cement pastes were investigated. Three nanomaterials, nano-limestone, nano-silica, and nano-clay (a highly purified magnesium aluminosilicate), were added to a cement paste at the levels of 0.0 %, 0.5 %, 1.0 %, and 1.5 % (by mass) of cement. The heat of cement hydration of the paste was measured using isothermal calorimetry. Rheological behavior of the paste was characterized using a rotational rheometer. The rheology measurements were performed at 10, 30, 60, 90, and 120 min after the cement was mixed with water. Set times of the paste were measured according to ASTM C191 [Standard Test Methods for Time of Setting of Hydraulic Cement by Vicat Needle, Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA]. The experimental results indicate that the addition of nano-limestone and nano-silica accelerated cement early hydration, the maximum heat flow increased, whereas the time to reach the heat-flow peaks decreased. The initial and final set times were also reduced. These effects were enhanced with increased nano-addition level. The addition of nano-clay also significantly increased the intensity of the heat flow peaks, and, especially, the peak corresponding to the renewed reaction of the aluminate phase. Addition of these nanomaterials generally increased yield stress and viscosity of the cement paste, especially after 60 min when cement hydration started to accelerate. Nano-clay considerably influenced the rheological behavior of the cement paste. Significantly higher shear stresses were required to initiate the flow.
dc.description.comments This article is published as Wang, Xin, Kejin Wang, Jussara Tanesi, and Ahmad Ardani. "Effects of nanomaterials on the hydration kinetics and rheology of Portland cement pastes." Advances in Civil Engineering Materials 3, no. 2 (2014): 142-159. DOI: 10.1520/ACEM20140021. Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/arY4R44v
dc.language.iso en_US
dc.publisher ASTM International
dc.source.uri https://doi.org/10.1520/ACEM20140021 *
dc.subject hydration kinetics
dc.subject nano-limestone
dc.subject nano-silica
dc.subject nano-clay
dc.subject rheology
dc.subject.disciplines DegreeDisciplines::Engineering::Civil and Environmental Engineering::Civil Engineering
dc.subject.disciplines DegreeDisciplines::Engineering::Nanoscience and Nanotechnology
dc.subject.disciplines DegreeDisciplines::Engineering::Engineering Science and Materials::Mechanics of Materials
dc.title Effects of Nanomaterials on the Hydration Kinetics and Rheology of Portland Cement Pastes
dc.type Article
dspace.entity.type Publication
relation.isAuthorOfPublication f9071b81-012f-4b6d-a040-9083bc33535c
relation.isOrgUnitOfPublication 933e9c94-323c-4da9-9e8e-861692825f91
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