El presente trabajo se centra en la utilización de aditivos acelerantes en concreto, el cual permite evitar riesgos de frágua y resistencia a la comprensión, debido a las características climatológicas en nuestro medio; además de ser un inhibidor de la corrosión sin embargo, a pesar de su importancia, es necesario conocer el acelerante, que tenga mejores rendimientos en cuento a tiempo de fragua, resistencia a la comprensión y los costos que suponen los aditivos comerciales en nuestra ciudad, por lo que se propone un estudio comparativo entre los aditivos Chema 3 y Chema Estruct para saber cuál es el más adecuado en mortero y concreto. En la actualidad el uso de aditivos acelerantes de fragua, es una técnica que se está empleando en el mundo para la elaboración de concreto y así garantizar el tiempo de fragua inicial del concreto expuesto a climas fríos. La presente tesis ...

The aim of this study was to analyze the chemical composition and surface topography of commercially pure titanium implants, obtained from three trademarks frequently used in dentistry. There were nine titanium implants of the following systems: As Technology, Neodent and Sistema Nacional de Implantes. These materials were divided into three groups, with three implants in each group. Photoelectron Spectroscopy Excited by X-ray (XPS) was used to determine the chemical composition, while to characterize the surface topography we used Scanning Electron Microscopy (SEM). Titanium, carbon, silicon and oxygen were identified in all samples analyzed. Other contaminants were: silicon, aluminum, sulfur, lead, phosphorus, calcium, sodium and nitrogen. We identified impurities on the surface of all implants analyzed. We consider necessary to development more studies relating the presence and concen...

The aim of this study was to analyze the chemical composition and surface topography of commercially pure titanium implants, obtained from three trademarks frequently used in dentistry. There were nine titanium implants of the following systems: As Technology, Neodent and Sistema Nacional de Implantes. These materials were divided into three groups, with three implants in each group. Photoelectron Spectroscopy Excited by X-ray (XPS) was used to determine the chemical composition, while to characterize the surface topography we used Scanning Electron Microscopy (SEM). Titanium, carbon, silicon and oxygen were identified in all samples analyzed. Other contaminants were: silicon, aluminum, sulfur, lead, phosphorus, calcium, sodium and nitrogen. We identified impurities on the surface of all implants analyzed. We consider necessary to development more studies relating the presence and concen...