ANDRADE, L. B.; http://lattes.cnpq.br/2578672694185624; ANDRADE, Laís Bento de.
Abstract:
The search for sustainable products has become an important factor to the future of construction
due to the limited amount of natural resources. For this reason, there are many studies about the
use of waste in building materials. Among the several studies about wastes, there are those from
kaolin production. Kaolin is a rock composed by kaolinite, which is used in various industrial
sectors of the country. The extraction and processing of this mineral are waste generators, that
are often unplanned discarded. There are studies on the potential of kaolin residue and its
applicability in alternative materials in the production of concretes, blocks and mortars. In order
to contribute to this research, this paper aims to evaluate the influence of kaolin residue on
properties in the fresh and hardened state of mortars. For this, two types of kaolin residues were
studied separately: the fine (RF), evaluated as hydrated lime substitution, and the coarse (RG),
as fine aggregate. The traces chosen for this study were 1:1:6 and 1:6 in volume, modifying the
residue ratio by 50% and 100% with conventional materials. There were also used in the mortars
plasticizer additive and metakaolin (MC). The methodology consisted of characterizing the
starting materials, physical properties (unit mass, specific mass and particle size), obtaining
data on chemical (x-ray fluorescence) and mineralogical (x-ray diffraction) composition. In
addition, the properties of fresh mortars (consistency index, fresh mass density and incorporated
air content) and hardened properties (bulk density, compressive strength and capillary water
absorption) were evaluated. The results showed good mechanical performance and a higher
kneading water consumption of the mortars constituted by residue. The use of plasticizer
additive contributed to the reduction of the water/cement factor and to the increase of
compressive strength compared to the reference mortars.
