scholarly journals Effect of kaolinitic clays from the State of Rio de Janeiro in the composition of whiteware floor tile bodies

Cerâmica ◽  
2006 ◽  
Vol 52 (322) ◽  
pp. 138-145 ◽  
Author(s):  
C. M. F. Vieira ◽  
L. A. Peçanha Jr. ◽  
S. N. Monteiro
Keyword(s):  
Rio De Janeiro ◽  
Ceramic Body ◽  
Mercury Porosimetry ◽  
Physical And Mechanical Properties ◽  
Floor Tile ◽  
Linear Shrinkage ◽  
The State ◽  
Ceramic Tiles ◽  
Industrial Processing ◽  
Floor Tiles

This work presents an investigation that was undertaken for three types of kaolinitic clays from the State of Rio de Janeiro, Brazil, with a potential use in whiteware floor tiles bodies. Different compositions prepared by mixing the three clays with other materials such as kaolin, quartz, philite, potash feldspar and talc, were investigated and compared with an industrial ceramic body for whiteware floor tiles (group BIIa). Physical and mechanical properties such as linear shrinkage, water absorption and flexural strength were evaluated in pressed specimens fired at temperatures varying from 1025 to 1225 ºC. The microstructure of the specimens was studied by X-ray diffraction, scanning electron microscopy and mercury porosimetry. The results indicated that the prepared compositions presented microstructural characteristics, specially the pore size distribution, and technological properties that are compatible with low-porosity ceramic tiles. However, they also display characteristics, such as an excessive plasticity and high loss on ignition, that could generate problems during the industrial processing.

Firing Behaviour of a Clayey Ceramic Body for Rustic Floor Tiles

2012 ◽  
Vol 727-728 ◽  
pp. 959-964 ◽  
Author(s):  
Carlos Maurício Fontes Vieira ◽  
Sérgio Neves Monteiro
Keyword(s):  
High Weight ◽  
Ceramic Body ◽  
Mercury Porosimetry ◽  
Linear Shrinkage ◽  
X Ray Diffraction ◽  
Microstructural Characteristics ◽  
Plagioclase Feldspar ◽  
X Ray ◽  
Firing Behavior ◽  
Floor Tiles

This work had as its objective to evaluate the firing behavior and microstructure of a typical clayey ceramic body from Campos dos Goytacazes, Brazil, used to fabricate extruded rustic floor tiles. The firing behavior of samples fired at 650, 850 and 1050°C was studied by thermal analysis (DTA/TG) and their microstructural characteristics were evaluated by mercury porosimetry and X-ray diffraction. Technological properties such as water absorption, linear shrinkage and flexural strength were also evaluated. The results showed that the clayey body presents a relatively high weight loss during firing due to a significant amount of clay mineral associated with aluminum hydroxide decomposition. After firing the clayey body developed an elevated amount of porosity and low mechanical strength. Quartz was detected as the only crystalline phase originated from the unfired body. By contrast, mullite, plagioclase feldspar and hematite appeared during the firing.

Using Experiments Design to Model Linear Firing Shrinkage of Triaxial Ceramic Bodies

2005 ◽  
Vol 498-499 ◽  
pp. 430-435 ◽  
Author(s):  
Sivaldo Leite Correia ◽  
K.A.S. Curto ◽  
Dachamir Hotza ◽  
Ana M. Segadães
Keyword(s):  
Regression Model ◽  
Raw Materials ◽  
Ceramic Body ◽  
Linear Shrinkage ◽  
Potash Feldspar ◽  
Ceramic Tiles ◽  
Quality Control Parameters ◽  
Firing Shrinkage ◽  
Ceramics Industry ◽  
The Ideal

In the development and manufacture stages of floor and wall ceramic tiles, firing shrinkage is basically determined by the combination of raw materials and frequently used as quality control parameters. This configures the ideal scenario to apply the techniques of experiments design, often used in various other areas, to model those properties of such ceramics bodies. In this work, ten formulations of three different raw materials, namely a clay mixture, potash feldspar and quartz (triaxial compositions) were selected and processed under conditions similar to those used in the ceramics industry. With the experimental results, a regression model was calculated, relating linear shrinkage with composition. After statistical analysis and verification experiments, the significance and validity of the model was confirmed. The regression model can then be used to select the best combination of those three raw materials to produce a ceramic body with specified properties.

Evaluation of the Physical and Mechanical Properties of Ceramic Tiles Processed Using Steel Slag

2013 ◽  
Vol 856 ◽  
pp. 257-261
Author(s):  
Benneth C. Chukwudi ◽  
Boniface A. Okorie
Keyword(s):  
Mechanical Properties ◽  
Steel Slag ◽  
Physical And Mechanical Properties ◽  
Linear Shrinkage ◽  
Modulus Of Rupture ◽  
Chemical Compositions ◽  
X Ray Diffraction ◽  
Ceramic Tiles ◽  
Kaolinite Clay ◽  
Surface Appearance

This present study has evaluated the physical and mechanical properties of ceramic tiles processed from steel slag. The chemical compositions of both samples were conducted using atomic absorption spectrophotometer (AAS). Steel slag in the range of 0-100wt% was added to kaolinite clay. The blended samples were hydraulic pressed into rectangular moulds, oven dried and sintered within the temperature range of 1100°C - 1200°C. Surface appearance and colouration of sintered products were observed. Linear shrinkage, apparent porosity, water absorption, bulk density, apparent specific gravity and modulus of rupture of sintered samples were examined. Phases present were identified using X-ray diffraction (XRD), while microstructural examination was conducted using scanning electron microscopy (SEM). Phases like quartz, wollastonite, enstatite, were identified. SEM showed considerable degree of vetrification at both temperatures. Results obtained showed that samples containing 25-75wt% steel slag have very good usable ceramic tile properties.

scholarly journals Reformulating Ceramic Body Composition to Improve Energy Efficiency in Brick Manufacture

2021 ◽  
pp. 257-268
Author(s):  
G. Wie-Addo ◽  
A. H. Jones ◽  
S. Palmer ◽  
V. Starinieri ◽  
J. Renshaw ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Water Absorption ◽  
Nepheline Syenite ◽  
Ceramic Body ◽  
Mercury Porosimetry ◽  
Analytical Techniques ◽  
Linear Shrinkage ◽  
Volumetric Shrinkage ◽  
Brick Clay ◽  
Improve Energy Efficiency

AbstractThe influence of inorganic minerals (colemanite and nepheline syenite) as additives for sustainable clay brick manufacture has been examined. Each additive was added at 4 wt% to 96 wt% brick clay and samples were fired to 950 °C and 1040 °C and then compared with samples of 100% brick clay. Multiple analytical techniques (X-ray fluorescence, dilatometry, boiling water absorption, volumetric shrinkage, and mercury porosimetry) were used for analysis. Dilatometry shows that the additives influenced the temperature at which shrinkage began and the extent of that shrinkage. The use of colemanite reduced the temperature at which the shrinkage began by 120 °C and nepheline syenite reduced it by 20 °C. A linear shrinkage in dilatometry of 1% (from the maximum expanded length) was achieved at 1000 °C for 100% clay, 875 °C for colemanite additions and 970 °C for nepheline syenite additions. However, for samples fired at 1040 °C for 2 h colemanite containing samples had significantly lower volumetric shrinkage and higher water absorption than 100% clay and nepheline syenite samples, suggesting the presence of higher amounts of open porosity caused by the decomposition of the colemanite on heating. Samples containing nepheline syenite had a lower volumetric shrinkage but also a marginally lower water absorption than the 100% clay. The further optimisation of these or similar additives could potentially provide energy saving opportunities and reductions in CO2 emissions for brick manufacturers.

Effect of ulexite concentrator waste on the physical and mechanical properties and sintering behaviour of floor tile bodies

Clay Minerals ◽  
2017 ◽  
Vol 52 (1) ◽  
pp. 97-105 ◽  
Author(s):  
K. Köseoğlu
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Bending Strength ◽  
Physical And Mechanical Properties ◽  
Floor Tile ◽  
X Ray Diffraction ◽  
X Ray ◽  
Floor Tiles ◽  
Firing Shrinkage ◽  
Sintering Behaviour

AbstractThe effect of ulexite concentrator waste on the physical and mechanical properties and sintering behaviour of a standard floor tiles (FT) body fired at 1080°C was studied. The linear firing shrinkage, water absorption and fired bending strength of the floor tile/tiles were determined. X-ray diffraction analyses identified quartz, albite, mullite and hematite phases in the floor tiles containing 3 wt.% waste material. The FT body with the smallest water absorption (∼0.2%), the greatest bending strength (∼335 kgf/cm2) and the second greatest linear firing shrinkage values had optimal composition. In light of the excellent physical-mechanical properties and the results of the scanning electron microscopy-energy dispersive X-ray analyses, the authors determined that the sintering temperature of the FT body containing 3 wt.% ulexite concentrator waste was reduced by 100°C.

Development of Ceramics Based on Clays from Different Regions in the State of Rio de Janeiro, Brazil

2014 ◽  
Vol 805 ◽  
pp. 530-535 ◽  
Author(s):  
Michelle Pereira Babisk ◽  
Angélica Pereira Ribeiro ◽  
Sergio Neves Monteiro ◽  
Carlos Maurício Fontes Vieira
Keyword(s):  
Flexural Strength ◽  
Water Absorption ◽  
Rio De Janeiro ◽  
Linear Shrinkage ◽  
The State ◽  
Ceramic Production ◽  
Superior Performance ◽  
The North ◽  
Technical Properties ◽  
Density Linear

The state of Rio de Janeiro, southeast of Brazil, has two poles of conventional clay ceramic production, mainly bricks and roofing tiles. In the north region of the state, the county of Campos dos Goytacazes and in the state center, the county of Itaborai, present distinct types of clay. With the aim to improve some characteristics of the Campos dos Goytacazes clay, the objective of this work was to investigate different mixtures with the Itaborai clay. Samples were press-molded with compositions of 0, 25, 50 and 75 wt% of both clays. The samples were fired at 800°C and the technical properties related to plasticity, density, linear shrinkage, water absorption and flexural strength were determined. The results indicated that the superior performance of the Itaborai clay significantly improves that of the Campos dos Goytacazes clay for any incorporated percentage. The mechanisms and reasons for these results are discussed.

Study of a Clayey Soil Used in the Fabrication of Red Ceramics in Campos Dos Goytacazes, Brazil

2014 ◽  
Vol 798-799 ◽  
pp. 15-20 ◽  
Author(s):  
Jonas Alexandre ◽  
Afonso Rangel Garcez de Azevedo ◽  
Gustavo de Castro Xavier ◽  
Leonardo Gonçalves Pedroti ◽  
Carlos Maurício Fontes Vieira ◽  
...  
Keyword(s):  
Apparent Density ◽  
Rio De Janeiro ◽  
Clayey Soil ◽  
Linear Shrinkage ◽  
Northern Region ◽  
The State ◽  
Oxide Content ◽  
Technical Properties ◽  
Structural Blocks ◽  
Red Ceramics

In the municipal area of Campos dos Goytacazes, the largest city in the northern region of the state of Rio de Janeiro, southeast of Brazil, there is a clay ceramic industrial pole comprising more than one hundred companies dedicated to the production of bricks, roofing tiles and structural blocks for civil construction. Currently, an estimated production of almost one billion pieces a year attends not only the state of Rio de Janeiro but also the neighbor states of Minas Gerais and Espírito Santo. In this work the characteristics and technical properties of the precursor clayey soil used by one of the leading local industry was studied. The initial characterization was performed by means of granulometric test, based on sieving and sedimentation methods, that allowed the separation of the material in its clay, silt and sand fractions. These fractions were chemically analyzed to evaluate the predominance of oxide content. The fluidity and plasticity limits as well as the apparent density were measured for clay bodies according to the standards. After sintering clay bodies at 700 and 900°C the ceramic technical properties of linear shrinkage, water absorption, apparent density and flexural strength were calculated following the norms. The results indicated that the precursor clay in Campos dos Goytacazes could be used for bricks but need to be incorporated with fluxing compounds to attend the requirements for structural blocks and roofing tiles.

Use of Eucalyptus Firewood Ash into Clayey Ceramic

2010 ◽  
Vol 660-661 ◽  
pp. 860-865
Author(s):  
Carlos Maurício Fontes Vieira ◽  
Monica Castoldi Borlini Gadioli ◽  
Sérgio Neves Monteiro
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Water Absorption ◽  
Rio De Janeiro ◽  
Physical And Mechanical Properties ◽  
The State ◽  
Kaolinitic Clay ◽  
Firing Properties

This work aims at evaluating the incorporation of eucalyptus firewood ash into clayey ceramic, through the physical and mechanical properties of the produced ceramics. Mixtures of kaolinitic clay from the municipal area of Campos of Goytacazes, in the state of Rio de Janeiro, Brazil, were prepared with additions of 0, 5, 10 and 20% in weight of ashes from eucalyptus firewood. Specimens were 20 MPa uniaxially press-molded and fired at 900°C. The evaluated firing properties were diametrical shrinkage, water absorption and mechanical strength by diametrical compression. The results showed that the incorporation of 10% wt. of firewood ash enhanced the properties of the clayey ceramic and since plasticity was optimised, water absorption decreased while the mechanical strength increased.

Integração local da população refugiada no estado do Rio de Janeiro:

Revista Prumo ◽  
2019 ◽  
Vol 4 (6) ◽  
pp. 42-53
Author(s):  
Ariane Rego de Paiva ◽  
Roberta Gomes Thomé
Keyword(s):  
Rio De Janeiro ◽  
Social Protection ◽  
The State ◽  
Refugee Population ◽  
Local Integration

This work presents a problematization about the local integration of refugees as one of the lasting solutions proposed by the UNHCR and the present challenges for the consolidation of policies of social protection for this segment in the state of Rio de Janeiro. This study was made through the bibliographic analisis and systematization of a workshop about the thematics carried with governamental and non-governamental agents and leaderships in the refugee population in the occasion of the seminar Mobility Crossroads: knowledge and practices in protection policies for refugee populations and migrants in vulnerable situation, which occurred in November 2017, organized by Cátedra Sérgio Vieira de Mello of PUC-Rio.

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