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

Ortega, Eduardo y Rodríguez Martínez, Oliver y Figueroa Labastida, Miguel y Villa Pulido, Andrés Alberto y Sánchez Fernández, Antonio y Cué Sampedro, Rodrigo y Gracia Pinilla, Miguel Ángel y Menchaca, Jorge Luis (2016) Long-term influence of chitin concentration on the resistance of cement pastes determined by atomic force microscopy. Physica status solidi. (A). pp. 1-7. ISSN 1862-6300

Vista previa

Texto Ortega_et_al-2016-physica_status_solidi_(a).pdf - Versión Publicada Available under License Creative Commons Attribution Non-commercial No Derivatives. Download (1MB) | Vista previa

Resumen

The presence of sulfates potentialize damage on cementbased 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.

Actions (login required)

Ver elemento