Flexural strength and fatigue properties of interfacial transition zone at the microscale

Flexural strength and fatigue properties of interfacial transition zone at the microscale

Gan, Y. (TU Delft Materials and Environment)
Zhang, Hongzhi (Shandong University)
Liang, M. (TU Delft Materials and Environment)
Zhang, Y. (TU Delft Materials and Environment)
Schlangen, E. (TU Delft Materials and Environment)
van Breugel, K. (TU Delft Materials and Environment)
Šavija, B. (TU Delft Materials and Environment)

2022

In this study, the flexural strength and fatigue properties of interfacial transition zone (ITZ) were experimentally investigated at the micrometre length scale. The hardened cement paste cantilevers (150 × 150 × 750 μm³) attached to a quartzite aggregate surface were prepared and tested under the monotonic and cyclic load using a nanoindenter. The measured flexural strength of the ITZ (10.49–14.15 MPa) is found to be one order of magnitude higher than the macroscopic strength of ITZ reported in literature. On the other hand, the fatigue strength of the ITZ is lower than that of bulk cement paste at same length scale, measured previously by the authors. The microscopic mechanical interlocking and the electrostatic interaction between aggregate surface and hydration products are thought to contribute to the bond strength of ITZ. This study provides an experimental basis for the development of multiscale analysis of concrete subjected to both static and fatigue loading.

Fatigue
Flexural strength
Interfacial transition zone
Microscale testing

http://resolver.tudelft.nl/uuid:fe811e21-c738-4ab3-a7cd-2b55bde2aaeb

https://doi.org/10.1016/j.cemconcomp.2022.104717

0958-9465

Cement and Concrete Composites, 133

Institutional Repository

journal article

© 2022 Y. Gan, Hongzhi Zhang, M. Liang, Y. Zhang, E. Schlangen, K. van Breugel, B. Šavija