Temperature influence on the physical and mechanical properties of a porous rock: San Julian's calcarenite

This work discusses the results from tests which were performed in order to study the effect of high temperatures in the physical and mechanical properties of a calcarenite (San Julian's stone). Samples, previously heated at different temperatures (from 105 °C to 600 °C), were tested. Non-destructive tests (porosity and ultrasonic wave propagation) and destructive tests (uniaxial compressive strength and slake durability test) were performed over available samples. Furthermore, the tests were carried out under different conditions (i.e. air-cooled and water-cooled) in order to study the effect of the fire off method. The results show that uniaxial compressive strength and elastic parameters (i.e. elastic modulus and Poisson's ratio), decrease as the temperature increases for the tested range of temperatures. A reduction of the uniaxial compressive strength up to 35% and 50% is observed in air-cooled and water-cooled samples respectively when the samples are heated to 600 °C. Regarding the Young's modulus, a fall over 75% and 78% in air-cooled and water-cooled samples respectively is observed. Poisson's ratio also declines up to 44% and 68% with the temperature in air-cooled and water-cooled samples respectively. Slake durability index also exhibits a reduction with temperature. Other physical properties, closely related with the mechanical properties of the stone, are porosity, attenuation and propagation velocity of ultrasonic waves in the material. All exhibit considerable changes with temperature.

Uso de Google Calendar para la coordinación entre asignaturas del Grado en Ingeniería Química

Uno de los aspectos peor valorados por los estudiantes de las nuevas titulaciones de grado es la coordinación entre asignaturas del mismo curso en cuanto a la distribución de controles y otro tipo de pruebas objetivas a lo largo del cuatrimestre, que afecta a la carga de trabajo no presencial en determinados momentos. En la guía docente de cada asignatura aparece la información sobre las pruebas a realizar dentro de un cronograma aproximado por semanas, y está disponible antes del comienzo del curso. Sin embargo, esa distribución puede variar ligeramente una vez empezado el curso debido a diversos motivos, y no se dispone de la información para todas las asignaturas del cuatrimestre en un mismo documento, lo que facilitaría su visualización. En este trabajo se propone el uso de la herramienta Google Calendar con el objetivo de tener un mayor control de este aspecto y poder detectar y corregir conflictos que puedan surgir, aplicándolo al Grado en Ingeniería Química.