A numerical study of fatigue of hardened cement paste at the microscale

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

doi:10.1016/j.ijfatigue.2021.106401

A numerical study of fatigue of hardened cement paste at the microscale

Title

A numerical study of fatigue of hardened cement paste at the microscale

Author

Gan, Y. (TU Delft Materials and Environment)
Zhang, Hongzhi (Shandong University)
Liang, M. (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)

Date

2021

Abstract

In this study, a numerical model using a 2D lattice network is developed to investigate the fatigue behaviour of cement paste at the microscale. Images of 2D microstructures of cement pastes obtained from XCT tests are used as inputs and mapped to the lattice model. Different local mechanical and fatigue properties are assigned to different phases of the cement paste. A cyclic constitutive law is proposed for considering the fatigue damage evolution. Fatigue experiments performed at the same length scale are used to calibrate and validate the model. The proposed model can reproduce well the flexural fatigue experimental results, in terms of S-N curve, stiffness degradation and residual deformation. The validated model is then used to predict the uniaxial tensile fatigue fracture of cement paste. The effects of microstructure and stress level on the fatigue fracture are studied using the proposed model. This model forms a basis for the multiscale analysis of concrete fatigue.

Subject

Cement paste
Fatigue
Lattice model
Microscale simulation

To reference this document use:

http://resolver.tudelft.nl/uuid:e9a906ea-7fd7-46b8-a2d7-005d417b8fe8

DOI

https://doi.org/10.1016/j.ijfatigue.2021.106401

ISSN

0142-1123

Source

International Journal of Fatigue, 151

Part of collection

Institutional Repository