Estudio de la conversión del cemento aluminoso
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Fecha
2004
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es
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Universidad Andrés Bello
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Licencia CC
Licencia CC
Resumen
Esta investigación evaluará la pérdida de resistencia mecánica a largo plazo que presentan los cementos de aluminato de calcio. Este fenómeno que sufren los cementos aluminosos se conoce con el nombre de conversión. Esta conversión corresponde al proceso de cambio en el tiempo de una conformación de hidratos metaestables (CAH10 y C2AHa) producida a bajas temperaturas (<25ºC) a una compuesta por hidratos estables (CJAH6) producida por la rehidratación de las moléculas del cemento aluminoso.
El proceso de conversión, si no se dan las condiciones adecuadas, y se mantienen los hidratos a bajas temperaturas puede durar varios años, y se ve acelerado con un aumento de la temperatura.
Es fundamental para el ingeniero conocer el comportamiento de este cemento aluminoso y saber con qué tipos de resistencias finales contará al término de la conversión, ya que para utilizar el cemento aluminoso en obras de ingeniería es importantísimo trabajar con las resistencias convertidas para dimensionar las obras y garantizar el cumplimiento de las resistencias exigidas en el tiempo. Para poder lograr esto, se definió una metodología basada en la normativa francesa y española vigente, en donde el proceso de conversión se ve acelerado por medio de curado a altas temperaturas.
La conclusión de esta investigación permitirá ampliar los conocimientos respecto de este material en nuestro país, así como también dar a conocer las bondades de este cemento aluminoso y el gran uso que tiene en aplicaciones especiales de ingeniería.
This investigation will evaluate the loss of mechanical resistance in the long term, loss suffered by calcium aluminate cements. This phenomenon suffered by aluminous cements is known as conversion. This conversion corresponds to the process of change in time from a condition of hydrates (CAH10 and C2AH8) produced at low temperatures (<250C) to a condition composed of stable hydrates (C3AH6) produced by the rehydration of aluminous cement molecules. The conversion process, if the adequate conditions are not fulfilled, and the hydrates are kept at low temperatures, can last for several years, and can be accelerated by a temperature increase. It is fundamental for the engineer to know the behavior of this aluminous cement, and to know what kind of final resistance he will have at the end of the conversion, since for the utilization of the aluminous cement in engineering works, it is very important to deal with converted resistances to dimension the work, and to guarantee the compliance of the in-time required resistances To achieve it, a methodology based on current French and Spanish regulation codes was defined, where curing at high temperatures accelerates the process of conversion. The conclusion of this investigation will allow us to expand our knowledge regarding this material in our country, and to show the properties of this aluminous cement and the great use it can have in special engineering applications.
This investigation will evaluate the loss of mechanical resistance in the long term, loss suffered by calcium aluminate cements. This phenomenon suffered by aluminous cements is known as conversion. This conversion corresponds to the process of change in time from a condition of hydrates (CAH10 and C2AH8) produced at low temperatures (<250C) to a condition composed of stable hydrates (C3AH6) produced by the rehydration of aluminous cement molecules. The conversion process, if the adequate conditions are not fulfilled, and the hydrates are kept at low temperatures, can last for several years, and can be accelerated by a temperature increase. It is fundamental for the engineer to know the behavior of this aluminous cement, and to know what kind of final resistance he will have at the end of the conversion, since for the utilization of the aluminous cement in engineering works, it is very important to deal with converted resistances to dimension the work, and to guarantee the compliance of the in-time required resistances To achieve it, a methodology based on current French and Spanish regulation codes was defined, where curing at high temperatures accelerates the process of conversion. The conclusion of this investigation will allow us to expand our knowledge regarding this material in our country, and to show the properties of this aluminous cement and the great use it can have in special engineering applications.
Notas
Tesis (Ingeniero Constructor)
Palabras clave
Cemento, Resistencia Mecánica