Evaluación de un nuevo constituyente del cemento Portland: ceniza de fondo molida

Abstract

Coal bottom ash is produced in electrical power stations as
result of the coal combustion. Because coal fly ash and coal
bottom ash are formed together in the same boiler, similar
chemical and mineralogical composition is expected. The size
and shape of these ashes is very different, and then, its effect
on the performance must be studied. In order to get a similar
grain size to that of the coal fly ash, the coal bottom ash was
ground.
Cement-based products are the main construction materials
which manufacture requires the use of significant natural
raw materials and energy. These manufacturing processes
result in several types of emissions. In particular, the cement
industry is under pressure to reduce CO2 emissions and some
studies have shown different measures to reach CO2 reduction.
For instance, reducing the clinker/cement factor will lead
to a clear CO2 emission reduction. In this work, ground coal
bottom ash is investigated to know its viability of being used
as a new Portland cement constituent. Then, it is studied
from a mechanical and durability point of view to evaluate
the potential use of the coal bottom ash as an innovative
binder. Ground coal bottom ash and fly ash mortars were more
carbonated and exhibited a lower compressive strength than
the reference mortars, but similar to each other.