Early-age hydration characteristics and kinetics of Portland cement pastes with super low w/c ratios using ice particles as mixing water

dc.contributor.author Wang, Kejin
dc.contributor.author Mingxu, Chen
dc.contributor.author Guo, Xiangyang
dc.contributor.author Lu, Lingchao
dc.contributor.author Wang, Shoude
dc.contributor.author Cheng, Xin
dc.contributor.author Wang, Kejin
dc.contributor.department Civil, Construction and Environmental Engineering
dc.date.accessioned 2022-01-26T17:49:23Z
dc.date.available 2022-01-26T17:49:23Z
dc.date.issued 2020-07
dc.description.abstract The liquid water was replaced by ice particles for preparing homogenous structural Portland cement (PC) pastes at super low w/c ratios from 0.08 to 0.16. For introducing the process of PC hydration, a sophisticated conduction calorimeter was adopted to measure the early-age hydration heat evolution. The hydration kinetic parameters were determined by Krstulovic–Dabic model based on data of hydration heat evolution. The concentrations of K+ and Na+ of the pore solution were measured by ICP-OES. Experimental results showed that the acceleration period of the hydration process of PC paste was improved by increasing w/c ratio due to the improvement of space available for hydration product growth. The hydration mechanism of PC paste changed to nucleation and crystal growth (NG) - diffusion (D) when its w/c ratio below 0.16, representing a more intense hydration reaction than that of PC with a normal w/c ratio of 0.30. The concentrations of K+ and Na+ of pore solution of hydrated PC paste decreased with the increase of w/c ratios, which led to the alkalinity of that decreased with the increase of w/c ratios. In addition, the mechanical properties of hardened PC pastes were enhanced by increasing w/c ratios from 0.08 to 0.16, which could be attributed to the decrease of porosities of hardened pastes.
dc.description.comments This article is published as Li, Laibo, Mingxu Chen, Xiangyang Guo, Lingchao Lu, Shoude Wang, Xin Cheng, and Kejin Wang. "Early-age hydration characteristics and kinetics of Portland cement pastes with super low w/c ratios using ice particles as mixing water." Journal of Materials Research and Technology 9, no. 4 (2020): 8407-8428. DOI: 10.1016/j.jmrt.2020.05.082. Copyright 2020 The Author(s). Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0). Posted with permission.
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/9z0Ke7or
dc.language.iso en_US
dc.publisher Elsevier B.V.
dc.source.uri https://doi.org/10.1016/j.jmrt.2020.05.082 *
dc.subject Portland cement
dc.subject Super low w/c ratios
dc.subject Early-age hydration
dc.subject Mechanical properties
dc.subject.disciplines DegreeDisciplines::Engineering::Civil and Environmental Engineering::Civil Engineering
dc.subject.disciplines DegreeDisciplines::Engineering::Engineering Science and Materials::Mechanics of Materials
dc.title Early-age hydration characteristics and kinetics of Portland cement pastes with super low w/c ratios using ice particles as mixing water
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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