Details
| Original language | English |
|---|---|
| Title of host publication | Rheology and Processing of Construction Materials |
| Subtitle of host publication | RheoCon2 & SCC9 |
| Editors | Viktor Mechtcherine, Kamal Khayat, Egor Secrieru |
| Publisher | Springer Netherlands |
| Pages | 610-618 |
| Number of pages | 9 |
| Edition | 1. |
| ISBN (electronic) | 978-3-030-22566-7 |
| ISBN (print) | 978-3-030-22565-0, 978-3-030-22568-1 |
| Publication status | Published - 25 Aug 2019 |
Publication series
| Name | RILEM Bookseries |
|---|---|
| Volume | 23 |
| ISSN (Print) | 2211-0844 |
| ISSN (electronic) | 2211-0852 |
Abstract
For modern concrete technology, rheology is crucial for characterizing the properties of fresh concrete on the basis of physically defined parameters. These properties can be influenced by many factors, but have an effect on paste level predominantly. To obtain an understanding of influencing factors such as the underlying kinetics and mechanisms at the initial colloidal scale a time variant analysis of cementitious suspensions is needed. In this article, a method to stop the hydration process of cementitious suspensions at any time by gradual water-isopropanol replacement and lyophilisation is demonstrated. Therefore, three different methods for hydration stop are investigated, namely water-isopropanol exchange, lyophilisation as well as a combination of both, and compared to pristine (non-reacted) cement particles. Analysis of dried samples leads to the observation that direct lyophilisation leads to particles of similar size as the pristine cement particles. Water-isopropanol replacement as well as water-isopropanol exchange with subsequent lyophilisation, instead, leads to a very broad particle size distribution with larger particles, which might be attributed to secondary agglomerations of particles. We further investigate the three different hydration stop methods by evaluating the pore size distribution by means of nitrogen physisorption. Additionally, scanning electron microscopy (SEM) as an imaging method is used.
Keywords
- Cementitious suspension, Freeze drying/lyophilisation, Hydration stop, Rheology, Time variant analysis
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Building and Construction
- Engineering(all)
- Mechanics of Materials
Cite this
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Rheology and Processing of Construction Materials : RheoCon2 & SCC9. ed. / Viktor Mechtcherine; Kamal Khayat; Egor Secrieru. 1. ed. Springer Netherlands, 2019. p. 610-618 (RILEM Bookseries; Vol. 23).
Research output: Chapter in book/report/conference proceeding › Contribution to book/anthology › Research
}
TY - CHAP
T1 - Comparison of Water-Isopropanol Replacement and Lyophilisation for Hydration Stop of Cementitious Suspensions
AU - Kißling, Patrick André
AU - Cotardo, Dario
AU - von Bronk, Tabea
AU - Lohaus, Ludger
AU - Bigall, Nadja-Carola
N1 - Funding information: Acknowledgments. Financial support from the German Research Foundation (DFG) within the framework of SPP 2005 (BI 1708/5-1 and LO 751/26-1), as well as from the project BI 1708/4-1.
PY - 2019/8/25
Y1 - 2019/8/25
N2 - For modern concrete technology, rheology is crucial for characterizing the properties of fresh concrete on the basis of physically defined parameters. These properties can be influenced by many factors, but have an effect on paste level predominantly. To obtain an understanding of influencing factors such as the underlying kinetics and mechanisms at the initial colloidal scale a time variant analysis of cementitious suspensions is needed. In this article, a method to stop the hydration process of cementitious suspensions at any time by gradual water-isopropanol replacement and lyophilisation is demonstrated. Therefore, three different methods for hydration stop are investigated, namely water-isopropanol exchange, lyophilisation as well as a combination of both, and compared to pristine (non-reacted) cement particles. Analysis of dried samples leads to the observation that direct lyophilisation leads to particles of similar size as the pristine cement particles. Water-isopropanol replacement as well as water-isopropanol exchange with subsequent lyophilisation, instead, leads to a very broad particle size distribution with larger particles, which might be attributed to secondary agglomerations of particles. We further investigate the three different hydration stop methods by evaluating the pore size distribution by means of nitrogen physisorption. Additionally, scanning electron microscopy (SEM) as an imaging method is used.
AB - For modern concrete technology, rheology is crucial for characterizing the properties of fresh concrete on the basis of physically defined parameters. These properties can be influenced by many factors, but have an effect on paste level predominantly. To obtain an understanding of influencing factors such as the underlying kinetics and mechanisms at the initial colloidal scale a time variant analysis of cementitious suspensions is needed. In this article, a method to stop the hydration process of cementitious suspensions at any time by gradual water-isopropanol replacement and lyophilisation is demonstrated. Therefore, three different methods for hydration stop are investigated, namely water-isopropanol exchange, lyophilisation as well as a combination of both, and compared to pristine (non-reacted) cement particles. Analysis of dried samples leads to the observation that direct lyophilisation leads to particles of similar size as the pristine cement particles. Water-isopropanol replacement as well as water-isopropanol exchange with subsequent lyophilisation, instead, leads to a very broad particle size distribution with larger particles, which might be attributed to secondary agglomerations of particles. We further investigate the three different hydration stop methods by evaluating the pore size distribution by means of nitrogen physisorption. Additionally, scanning electron microscopy (SEM) as an imaging method is used.
KW - Cementitious suspension
KW - Freeze drying/lyophilisation
KW - Hydration stop
KW - Rheology
KW - Time variant analysis
UR - http://www.scopus.com/inward/record.url?scp=85071476092&partnerID=8YFLogxK
U2 - 10.1007/978-3-030-22566-7_71
DO - 10.1007/978-3-030-22566-7_71
M3 - Contribution to book/anthology
AN - SCOPUS:85071476092
SN - 978-3-030-22565-0
SN - 978-3-030-22568-1
T3 - RILEM Bookseries
SP - 610
EP - 618
BT - Rheology and Processing of Construction Materials
A2 - Mechtcherine, Viktor
A2 - Khayat, Kamal
A2 - Secrieru, Egor
PB - Springer Netherlands
ER -