Pràctica de laboratori : assaig Jominy

El projecte consisteix en realitzar una pràctica de laboratori pels alumnes d'Enginyeria de Materials. La pràctica de laboratori consisteix en posar en pràctica l'assaig Jominy. Aquest assaig permet conèixer la trempabilitat dels acers. L'assaig s'ha de realitzar sota les condicions que descriu la norma ASTM. A més, en el projecte s'han realitzat assajos de duresa, s'han estudiat les microestructures obtingudes en el material una vegada s'ha realitzat l'assaig i, amb el difractograma de Raigs X, s'han conegut les fases que es trobaven presents en el material. Finalment s'han calculat els costos per una banda de la totalitat del projecte, i per altra banda s'ha calculat el cost que suposaria per a la universitat que els alumnes realitzessin la pràctica.

Response of the Thermal Conductivity as a Function of Water Content of a Burnt Mediterranean Loam Soil

The purpose of this research is to explore the variability on the soil thermal conductivity -λ- after a prescribe fire, and to assess the effects of the ashes on the heat transfer once it"s were incorporated into the soil matrix. Sampling plot was located in the Montgrí Massif (NE of Spain). A set of 42 soil samples between surface and 5 cm depth was collected before and after the fire. To characterize the soil chemical and physical variables were analyzed. To determine the vari-ability on the soil λ a dry-out curve per scenario (before and after fire) was determined. SoilRho® method based on ASTM D-5334-08 which was validated by LabFerrer was used. Soil thermal conductivity has shown changes in their values. Indeed, in all moisture scenarios the values of soil λ decreased after soil was burnt. The critical point in the rela-tionship ϴ (λ) for the soil after fire which always was stronger than soil before to be burnt. Soil with"white" ashes showed a high thermal conductivity. An X-Ray diffractometry analysis allowed to clarify and to verify these results. To sum up, we could say that thermal conductivity presents changes when the scenario changes, i.e. before and after to be burnt. On the other hand, the volume of ashes incorporated on the soil increased the differences between no burnt and burnt soil, showing even some improvements on the heat transfer when water content started to govern the process.