Presenter Information

Yuqing DaiFollow

Keywords

Waterborne epoxy, Saline solution, Immersion actions, Tensile behaviors, Physicochemical change

Abstract

Organic coatings can greatly improve the resistant abilities against the migration of harmful species into concrete, resulting in the higher durability performances of concrete structures. Therefore, it is essential to assess the engineering performances of organic coatings in the service environments. In this work, the engineering performances and microstructure of a waterborne epoxy that can be used as a component of concrete’s protective coatings were investigated. The waterborne epoxy samples were immersed in tap water, 5wt% NaCl solution and 5% Na2SO4 solution for 28 d. A direct tensile test equipped with microscopy was conducted to measure the tensile strength and failure process of the waterborne epoxy samples before and after the immersion actions. The physicochemical interactions between the environments and waterborne epoxy samples were investigated by X-ray photoelectron spectroscopy (XPS), and scanning electron microscope (SEM) with dispersive X-ray spectroscopy (EDS). Results show that the immersion actions had limited influences on the tensile performances of the waterborne epoxy, but altered the microstructure and chemical structure to certain extents. The findings of this work would deepen the understandings in environmental actions to organic coatings, enabling a more accurate assessment of service life of concrete with organic coatings.

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Tensile Performance of Waterborne Epoxy Coating Immersed in Saline Solutions

Organic coatings can greatly improve the resistant abilities against the migration of harmful species into concrete, resulting in the higher durability performances of concrete structures. Therefore, it is essential to assess the engineering performances of organic coatings in the service environments. In this work, the engineering performances and microstructure of a waterborne epoxy that can be used as a component of concrete’s protective coatings were investigated. The waterborne epoxy samples were immersed in tap water, 5wt% NaCl solution and 5% Na2SO4 solution for 28 d. A direct tensile test equipped with microscopy was conducted to measure the tensile strength and failure process of the waterborne epoxy samples before and after the immersion actions. The physicochemical interactions between the environments and waterborne epoxy samples were investigated by X-ray photoelectron spectroscopy (XPS), and scanning electron microscope (SEM) with dispersive X-ray spectroscopy (EDS). Results show that the immersion actions had limited influences on the tensile performances of the waterborne epoxy, but altered the microstructure and chemical structure to certain extents. The findings of this work would deepen the understandings in environmental actions to organic coatings, enabling a more accurate assessment of service life of concrete with organic coatings.