Chemo-physico-mechanical properties of the interface zone between bacterial PLA self-healing capsules and cement paste

Journal article (2020)

Authors

C. Romero Rodriguez Materials and Environment - CEG
F. França de Mendonça Filho Materials and Environment - CEG
L. Mercuri Politecnico di Torino
Y. Gan Materials and Environment - CEG
E. Rossi Materials and Environment - CEG
G. Anglani Politecnico di Torino
P. Antonaci Politecnico di Torino
E. Schlangen Materials and Environment - CEG
B. Šavija Materials and Environment - CEG
Research Group
Materials and Environment (CEG) (TU Delft)
Copyright: © 2020 C. Romero Rodriguez, F. França de Mendonça Filho, L. Mercuri, Y. Gan, E. Rossi, G. Anglani, P. Antonaci, E. Schlangen, B. Šavija
DOI: https://doi.org/10.1016/j.cemconres.2020.106228
More Info
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Published Date

2020

Language

English

Faculty

Civil Engineering & Geosciences

Department

Materials- Mechanics- Management & Design

Research Group

Materials and Environment

Abstract

In this study, the interface between different types of bacteria-embedded self-healing polylactic acid capsules (PLA) and cement paste is investigated. Particularly, the changes in microstructure and mechanical properties of the interface with respect to bulk cement paste were studied. First, nanoindentation was performed to obtain maps of hardness and elastic modulus in the interfaces. Lattice modeling of uniaxial tensile test on the mapped locations was performed then to obtain the overall tensile strength and stiffness of the interface. Moreover, hydrates assemblage and chemical composition around the PLA particles were studied through Backscattering Electron images and Energy Dispersive X-ray Spectroscopy. The ratios between resulting tensile strength and elastic modulus of the interface with respect to bulk paste were obtained for each PLA type. The results suggest that PLA can be tailored to optimize the physico-mechanical properties of the interface and hence, the mechanical behavior and triggering efficiency of the self-healing system.