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Article
Affiliation(s)

1. Department of Civil Engineering, University of the State of Minas Gerais, Divinópolis/Minas Gerais 35501-170, Brazil
2. Department of Mining Engineering, Federal University of Minas Gerais, Belo Horizonte/Minas Gerais 31270-901, Brazil

ABSTRACT

This paper proposes to go a little further on the microstructural characterization of surfaces and interfaces of Portland cement mortars. Using scanning electron microscope high-resolution (SEM-FEG), will be used to clarify the micro and nanometric details of cementitious material in Portland cement mortars. The technique of sample preparation is relatively simple compared to other devices and allows the analysis of samples in a natural state which ensures ideal conditions for the characterization of the material. In photomicrographs using high resolution scanning electron microscope (SEM-FEG), increases of about 80 thousand times with great quality were possible, in this paper, we can see above, photomicrographs with an increase of up to 50 thousand times, which enables the visualization of nanopores in mortar matrix. Photomicrographs made in SEM-FEG dual FIB 3D and SEM-FEG Quanta confirm the predominance of euhedral crystals of ettringite in the block-ceramic mortar, characterized by their morphology of hexagonal crystals acicular interface region, and we can also check the lamellar morphology characteristic of portlandite. Photomicrographs made with the SEM-FEG Dual-FIB and SEM-FEG Quanta have confirmed the predominance of euhedral crystals of ettringite in the block-ceramic mortar interface region, characterized by their morphology of hexagonal acicular crystals. Also, the typical morphologies of portlandite, calcite and CSH (calcium silicate hydrate) have been observed with great detail.

KEYWORDS

Nano and microstructural characterization, mortar, scanning electron microscopy, interfaces and surfaces, cementitious materials.

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