Long-term influence of chitin concentration on the resistance of cement pastes determined by atomic force microscopy

The presence of sulfates potentialize damage on cement‐based materials, leading to structural failures. Therefore, structures must be designed to compensate for this effect. The mechanical properties of cement–chitin mixtures are investigated with different percentages of chitin (0.5, 1.3, and 2.1 w...

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Published in:Physica status solidi. A, Applications and materials science Applications and materials science, 2016-12, Vol.213 (12), p.3110-3116
Main Authors: Ortega, Eduardo, Rodríguez-Martínez, Oliver, Figueroa-Labastida, Miguel, Villa-Pulido, Andrés Alberto, Sánchez-Fernández, Antonio, Cué-Sampedro, Rodrigo, Gracia-Pinilla, Miguel Angel, Menchaca, Jorge Luis
Format: Article
Language:English
Subjects:
Atomic force microscopy
Cement
Cements
Chitin
elastic properties
Exposure
Mechanical properties
nanoindentation
Nanostructure
Pastes
Spectrum analysis
Sulfates
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Summary:The presence of sulfates potentialize damage on cement‐based materials, leading to structural failures. Therefore, structures must be designed to compensate for this effect. The mechanical properties of cement–chitin mixtures are investigated with different percentages of chitin (0.5, 1.3, and 2.1 wt.%) and aging of composite in a joint nanoscopic‐ and macroscopic‐scale by experimental study. The objective is to increase the durability of concrete elements at coastal aquifers where concrete structures are in constant exposure to sulfate ions, chloride ions among others. Tapping mode AFM was used to characterize the surface structure and roughness of the cement pastes. To verify the chitin addition and the formation of sulfate‐based aggregates Raman and IR spectra were recorded and are presented in this work. Then, force spectroscopy was used to obtain the nanomechanical properties at three different exposure times (1 day, 6 months, and 1 year) into water or a SO4−2 environment. Macroscopic parameters (e.g., compression strength of cylindrical probes) were assessed for comparison following standard guidelines. The results show a decrease of its mechanical properties as a function of the polymer concentration but more importantly, they correlate the elasticity and adhesion at the nanoscale with the behavior of the bulk material.
ISSN:1862-6300
1862-6319
DOI:10.1002/pssa.201600105