Multi-scale observations of structure and chemical composition changes of portland cement systems during hydration

Moradian, Masoud; Hu, Qinang; Aboustait, Mohammed; Ley, Matthew T.; Hanan, Jay C.; Xiao, Xianghui; Rose, Volker; Winarski, Robert; Scherer, George W.

doi:10.1016/j.conbuildmat.2019.04.013

Title: Multi-scale observations of structure and chemical composition changes of portland cement systems during hydration

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Abstract

There is little agreement about the mechanisms or direct measurements of the transition of cement paste from a slurry to a solid. This paper uses five different in-situ X-ray imaging at multiple length scales (from 15.6 nm to 1 μm) to follow the three dimensional microstructural evolution of portland cement, and monoclinic tricalcium silicate paste over the first 16 h of hydration. Measurements of over 60,000 particles in industrially relevant water-to-solids ratios (w/s) captured every 10 min were made at the micron scale. Nanoscale examinations of the structure and chemistry are used to support this work. The results show that hydration products with an average Ca/Si > 3 form on and near the surface of the hydrating particles that appear to control the reaction rate. These hydration products appear to change in chemistry right as more rapid dissolution and formation of hydration products during the acceleration period. A mechanism is proposed that uses these observations to explain the different rates of reaction that describe how concrete stiffens and gains strengths.

Authors:

Moradian, Masoud ^[1]; Hu, Qinang ^[1]; Aboustait, Mohammed ^[1]; Ley, Matthew T. ^[1]; Hanan, Jay C. ^[2]; Xiao, Xianghui ^[3]; Rose, Volker ^[4]; Winarski, Robert ^[5]; Scherer, George W. ^[6]

Oklahoma State Univ., Stillwater, OK (United States). School of Civil and Environmental Engineering
Oklahoma State Univ., Tulsa, OK (United States). School of Mechanical and Aerospace Engineering
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS), and Center for Nanoscale Materials
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
Princeton Univ., NJ (United States). Dept. of Civil & Environmental Engineering

Publication Date:: Wed Jul 10 00:00:00 EDT 2019

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:: U.S. Department of Transportation, Federal Highway Administration; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1567190

Alternate Identifier(s):: OSTI ID: 1573247

Grant/Contract Number:: AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Construction and Building Materials

Additional Journal Information:: Journal Volume: 212; Journal Issue: C; Journal ID: ISSN 0950-0618

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; acceleration period; calorimetry; cement hydration; induction period; x-ray computed tomography

Citation Formats


                    Moradian, Masoud, Hu, Qinang, Aboustait, Mohammed, Ley, Matthew T., Hanan, Jay C., Xiao, Xianghui, Rose, Volker, Winarski, Robert, and Scherer, George W. Multi-scale observations of structure and chemical composition changes of portland cement systems during hydration.  United States: N. p., 2019. 
Web.  doi:10.1016/j.conbuildmat.2019.04.013.

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                    Moradian, Masoud, Hu, Qinang, Aboustait, Mohammed, Ley, Matthew T., Hanan, Jay C., Xiao, Xianghui, Rose, Volker, Winarski, Robert, & Scherer, George W. Multi-scale observations of structure and chemical composition changes of portland cement systems during hydration.  United States.  https://doi.org/10.1016/j.conbuildmat.2019.04.013

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                    Moradian, Masoud, Hu, Qinang, Aboustait, Mohammed, Ley, Matthew T., Hanan, Jay C., Xiao, Xianghui, Rose, Volker, Winarski, Robert, and Scherer, George W. Wed .  
"Multi-scale observations of structure and chemical composition changes of portland cement systems during hydration".  United States.  https://doi.org/10.1016/j.conbuildmat.2019.04.013.  https://www.osti.gov/servlets/purl/1567190.

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@article{osti_1567190,

  title        = {Multi-scale observations of structure and chemical composition changes of portland cement systems during hydration},

  author       = {Moradian, Masoud and Hu, Qinang and Aboustait, Mohammed and Ley, Matthew T. and Hanan, Jay C. and Xiao, Xianghui and Rose, Volker and Winarski, Robert and Scherer, George W.},

  abstractNote = {There is little agreement about the mechanisms or direct measurements of the transition of cement paste from a slurry to a solid. This paper uses five different in-situ X-ray imaging at multiple length scales (from 15.6 nm to 1 μm) to follow the three dimensional microstructural evolution of portland cement, and monoclinic tricalcium silicate paste over the first 16 h of hydration. Measurements of over 60,000 particles in industrially relevant water-to-solids ratios (w/s) captured every 10 min were made at the micron scale. Nanoscale examinations of the structure and chemistry are used to support this work. The results show that hydration products with an average Ca/Si > 3 form on and near the surface of the hydrating particles that appear to control the reaction rate. These hydration products appear to change in chemistry right as more rapid dissolution and formation of hydration products during the acceleration period. A mechanism is proposed that uses these observations to explain the different rates of reaction that describe how concrete stiffens and gains strengths.},

  doi          = {10.1016/j.conbuildmat.2019.04.013},

  journal      = {Construction and Building Materials},

  number       = C,

  volume       = 212,

  place        = {United States},

  year         = {Wed Jul 10 00:00:00 EDT 2019},

  month        = {Wed Jul 10 00:00:00 EDT 2019}

}

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