Analysis of temperatures during the firing bricks and final properties solid

Abstract

Context: Since the estructural behavior of the walls in a building directly depends on the properties of the blocks used, these properties are very important. In particular, the final properties of a ceramic block (often used in masonry) depend on the cooking temperature of the pulp. Objective: The purpose of this research is to determine the relationship between the final properties of a ceramic block and the temperature at which it was cooked. Additionally, it is wroth considering how quickly these temperatures vary in the kiln. Method: In first place, a system based on Labview was used to record the temperatures in the oven. In second place, it was considered the temperature increasing rate according to the ideal curve for baking blocks, which was classified inside the oven. In third place, samples of the product were taken according to the technical norms NTC 4017 and NTC 4205 in order to determine the properties of the block. Results: According to the samples, we determined: the Initial absorption of water (TIA), the absorption rate at 24 hours of immersion, the compressive strength, and the Modulus of Rupture (MR). Additionally, applying a multiple linear regression analysis, it was found a relationship between the TIA, the temperature increase rate, and the MR. Conclusions: From the results in the research, it is possible to conclude that: blocks baked at more than 1000 °C have the highest modulus of rupture (1.54 MPa); however, it was found that blocks baked at lower temperature presented the highest initial absorption rate (0.37 gr/cm2/min) and the best compressive strength (7.28 MPa). Finally, since the temperature and time are not controlled during the baking process, it is difficult for properties to be the most suitable.

Keywords

• curva cocción, propiedades, ladrillos, arcilla