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Hydration of Binary Portland Cement Blends Containing Silica Fume: A Decoupling Method to Estimate Degrees of Hydration and Pozzolanic Reaction
Frontiers in Materials
  • Wenyu Liao
  • Xiao Sun
  • Aditya Kumar, Missouri University of Science and Technology
  • Hongfang Sun
  • Hongyan Ma, Missouri University of Science and Technology
Abstract

Determination of degrees of hydration/reaction of components of blended cementitious systems (i. e., cement and SCMs: supplementary cementitious materials) is essential to estimate the systems' properties. Although the best methods for determining degrees of reaction of different SCMs have been recommended by RILEM TC238, they rely on either expensive equipment (e.g., nuclear magnetic resonance) or time-consuming sample preparation and data processing (e.g., backscattered electron image analysis). Furthermore, these methods cannot simultaneously characterize degree of hydration of cement and degree of reaction of SCMs. A novel decoupling method, which can simultaneously estimate the degree of hydration of cement and the degree of reaction of silica fume in binary cementitious materials, is proposed in this study. Based on experimentally determined and theoretically validated stoichiometric parameters of cement hydration and pozzolanic reaction, the contents of calcium hydroxide and hydrate water in pastes are expressed as functions of degree of hydration of cement and degree of reaction of silica fume. With the two contents determined by thermogravimetric analysis, the two degrees can be solved mathematically. It is found that in binary binders the incorporation of silica fume affects hydration kinetics of cement, leading to lower ultimate degree of hydration, shorter dormant stage, and faster hydration in the acceleration stage. As a result, the degree of hydration of cement in blended paste is higher at early ages (e.g., 3 days) but lower at later ages (e.g., 120 days) than that in plain cement paste. In a given blended paste, the degree of reaction of silica fume can be tied to the degree of hydration of cement. The decoupling method is promising for rapid estimations of degrees of hydration/reaction of cementitious materials in a blended system, since it does not require expensive characterization tools or complex data processing methods.

Department(s)
Materials Science and Engineering
Second Department
Civil, Architectural and Environmental Engineering
Comments

Financial support from National Science Foundation under 1761697 and 1661609 and from the Advanced Materials for Sustainable Infrastructure seed funding at Missouri University of Science and Technology is gratefully acknowledged.

Keywords and Phrases
  • Blended cement,
  • Decoupling,
  • Degree of hydration,
  • Pozzolanic reaction,
  • Silica fume,
  • Thermogravimetric analysis
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2019 Liao, Sun, Kumar, Sun and Ma, All rights reserved.
Creative Commons Licensing
Creative Commons Attribution 4.0
Publication Date
4-1-2019
Citation Information
Wenyu Liao, Xiao Sun, Aditya Kumar, Hongfang Sun, et al.. "Hydration of Binary Portland Cement Blends Containing Silica Fume: A Decoupling Method to Estimate Degrees of Hydration and Pozzolanic Reaction" Frontiers in Materials Vol. 6 (2019) ISSN: 2296-8016
Available at: http://works.bepress.com/aditya-kumar/47/