Fracture properties of cement hydrates determined from mircobending tests and multiscale modeling

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F18%3A00322893" target="_blank" >RIV/68407700:21110/18:00322893 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Fracture properties of cement hydrates determined from mircobending tests and multiscale modeling
Original language description
The paper shows experimental results received from bending tests performed on micro-beams fabricated with focused ion beam milling. The micro-beams were bent by nanoindenter and load-displacement curves recorded. From that, tensile strength and fracture energy were deducted for individual cement paste constituents at the level of a few micrometers. The tensile strength of the C-S-H rich inner product reached 700 MPa while the supremum of fracture energy was in the range of 4-20 J/m2. The experimentally obtained values served for verification of the multi-scale numerical model that was built for scales starting from C-S-H globules (1-100 nm) to cement paste level (up to 1-100 µm). Simulation of random packing of C-S-H globules reproduced well experimental data, yielding cohesive stress of the globule as 2500 MPa. A weak size effect was found on the scale of C-S-H up to 1000 nm, signalizing high ductility and weak strain localization. Further extension to cement paste was proposed, introducing defects responsible for further strength reduction on scaling.
Czech name
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Czech description
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Project
<a href="/en/project/GA17-05360S" target="_blank" >GA17-05360S: Small-scale fracturing of amorphous and crystalline materials assessed with nanoindentation and focused ion beam</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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