Godoy Cruz

Hace algunos meses que visitando la célebre abadía de Fitero y ocupándome en revolver algunos volúmenes en su abandonada biblioteca, descubrí en uno de sus rincones dos o tres cuadernos de música bastante antiguos, cubiertos de polvo y hasta comenzados a roer por los ratones.

Although more than 10 years of studies on delayed ettringite formation (DEF) have led to consensus in numerous areas of past disagreements, some questions remain experimental work is needed to complete the knowledge of this pathology. Following this objective, this paper studies the influence of pre-existing microcracking, wetting/drying cycles and the type of sulfated addition on DEF in steam cured mortars. The mortar specimens were prepared using an Ordinary Portland Cement and two types of sulfate were added to the mixtures: calcium sulfate (CaSO 4) or sodium sulfate (Na 2 SO 4). The results confirm the well-known effect of temperature: no expansion was observed in any of the mixtures cured at room temperature. Moreover, no expansion was observed after 800 days for the reference mortar or for the mortar containing calcium sulfate but all the specimens of heat-cured mortars containing sodium sulfate expanded markedly after about 50 days whatever the supplementary treatments applied (thermal shrinkage or wetting/drying cycles). These results show the significant role played by alkalis in the occurrence of delayed ettringite. The supplementary treatments intended to cause prelimiray microcracking of the specimens did not promote expansion but contributed to a slight acceleration of the reaction. The ultimate values of expansion were similar to those obtained with sound mortars.

Previamente a abordar el estudio del Derecho Civil, objetivo fundamental de esta guía, debemos comenzar estudiando los lineamientos básicos del Derecho en general.-Etimológicamente "derecho" alude a "directum", "dirigido".-Existen algunas definiciones erróneas acerca del concepto de derecho, tales como, aquellas que lo identifican con la ley.-Claramente no es así, pues el derecho es anterior a la ley.-La ley no es sino un instrumento de expresión del derecho que deberá completarse, ante sus lagunas o conceptos oscuros con otras fuentes del derecho, que estudiaremos más adelante.-El derecho surge ante el desorden de las conductas humanas y la necesidad de disciplinarlas.-Para que la persona logre sus fines este ordenamiento debe ser justo.-