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Analysis of temperatures during the firing bricks and final properties solid
Authors: Gustavo Guerrero Gómez, Edwin Espinel Blanco, Heller Guillermo Sánchez Acevedo
Number of views: 396
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.