Print Email Facebook Twitter Chemo-physico-mechanical properties of the interface zone between bacterial PLA self-healing capsules and cement paste Title Chemo-physico-mechanical properties of the interface zone between bacterial PLA self-healing capsules and cement paste Author Romero Rodriguez, C. (TU Delft Materials and Environment) França de Mendonça Filho, F. (TU Delft Materials and Environment) Mercuri, L. (Politecnico di Torino) Gan, Y. (TU Delft Materials and Environment) Rossi, E. (TU Delft Materials and Environment) Anglani, G. (Politecnico di Torino) Antonaci, P. (Politecnico di Torino) Schlangen, E. (TU Delft Materials and Environment) Šavija, B. (TU Delft Materials and Environment) Date 2020 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. Subject Bacterial self-healing concreteLattice modelMicromechanicsNanoindentationPoly-lactic acid capsules To reference this document use: http://resolver.tudelft.nl/uuid:64c848a0-9af0-4cdf-890e-d9b9394cfa89 DOI https://doi.org/10.1016/j.cemconres.2020.106228 ISSN 0008-8846 Source Cement and Concrete Research, 138 Part of collection Institutional Repository Document type journal article Rights © 2020 C. Romero Rodriguez, F. França de Mendonça Filho, L. Mercuri, Y. Gan, E. Rossi, G. Anglani, P. Antonaci, E. Schlangen, B. Šavija Files PDF 1_s2.0_S0008884620307845_main.pdf 14.92 MB Close viewer /islandora/object/uuid:64c848a0-9af0-4cdf-890e-d9b9394cfa89/datastream/OBJ/view