Abstract
Ultrasonic methods have been developed in the past to study properties of cement based materials in the fresh and hardening period. Especially by combined shear and compressional wave measurements, several possibilities exist for better describing the changing properties of cementitious materials at very early age. Within the paper test results (Vicat and Ultrasound) from different cementitious pastes with optimized packing density (use of inert micro and eco fillers as replacement of Portland cement clinker) are presented and discussed. Dynamic elastic properties at early age like the dynamic shear modulus and the dynamic elastic modulus are calculated from the ultrasound investigations and correlated with standard test methods. Based on the experimental investigations it is discussed that the setting and hardening of cementitious mixes can by strongly influenced by just optimizing packing density. The concept of optimizing packing density results in a decreased water demand and thus reduced water film thickness between the particles that can be calculated analytically. It is shown that the calculated water film thickness is a good indicator not only for initial and final setting, but also for workability and strength development.
Translated title of the contribution | Untersuchung des Einflusses der Mischungszusammensetzung von Zementleimen mit optimierter Packungsdichte auf das Erstarrungs- und Erhärtungsverhalten mit Ultraschall |
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Original language | English |
Title of host publication | SynerCrete'18: Interdisciplinary Approaches for Cement-based Materials and Structural Concrete |
Subtitle of host publication | Synergizing Expertise and Bridging Scales of Space and Time |
Place of Publication | Paris - France |
Publisher | RILEM Publications S.a.r.l. |
Pages | 243-248 |
Number of pages | 6 |
Volume | 1 |
ISBN (Print) | 978-2-35158-211-4 |
DOIs | |
Publication status | Published - 24 Oct 2018 |
Event | International COST/RILEM Conference on Interdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time: SynerCrete 2018 - Hotel Pestana Casino Park, Funchal, Madeira, Portugal Duration: 24 Oct 2018 → 26 Oct 2018 Conference number: RILEM121 https://synercrete.com/ http://www.synercrete.com |
Publication series
Name | Rilem Proceedings PRO 121 |
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Conference
Conference | International COST/RILEM Conference on Interdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time |
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Abbreviated title | SynerCrete |
Country/Territory | Portugal |
City | Funchal, Madeira |
Period | 24/10/18 → 26/10/18 |
Internet address |
Keywords
- US testing
- cementitious material
- setting
- hardening
Fields of Expertise
- Advanced Materials Science